diff options
Diffstat (limited to 'freebsd/sys/kern/vfs_syscalls.c')
| -rw-r--r-- | freebsd/sys/kern/vfs_syscalls.c | 4748 |
1 files changed, 4748 insertions, 0 deletions
diff --git a/freebsd/sys/kern/vfs_syscalls.c b/freebsd/sys/kern/vfs_syscalls.c new file mode 100644 index 00000000..06aaa935 --- /dev/null +++ b/freebsd/sys/kern/vfs_syscalls.c @@ -0,0 +1,4748 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * (c) UNIX System Laboratories, Inc. + * All or some portions of this file are derived from material licensed + * to the University of California by American Telephone and Telegraph + * Co. or Unix System Laboratories, Inc. and are reproduced herein with + * the permission of UNIX System Laboratories, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_capsicum.h" +#include "opt_ktrace.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bio.h> +#include <sys/buf.h> +#include <sys/capsicum.h> +#include <sys/disk.h> +#include <sys/sysent.h> +#include <sys/malloc.h> +#include <sys/mount.h> +#include <sys/mutex.h> +#include <sys/sysproto.h> +#include <sys/namei.h> +#include <sys/filedesc.h> +#include <sys/kernel.h> +#include <sys/fcntl.h> +#include <sys/file.h> +#include <sys/filio.h> +#include <sys/limits.h> +#include <sys/linker.h> +#include <sys/rwlock.h> +#include <sys/sdt.h> +#include <sys/stat.h> +#include <sys/sx.h> +#include <sys/unistd.h> +#include <sys/vnode.h> +#include <sys/priv.h> +#include <sys/proc.h> +#include <sys/dirent.h> +#include <sys/jail.h> +#include <sys/syscallsubr.h> +#include <sys/sysctl.h> +#ifdef KTRACE +#include <sys/ktrace.h> +#endif + +#include <machine/stdarg.h> + +#include <security/audit/audit.h> +#include <security/mac/mac_framework.h> + +#include <vm/vm.h> +#include <vm/vm_object.h> +#include <vm/vm_page.h> +#include <vm/uma.h> + +#include <ufs/ufs/quota.h> + +MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information"); + +SDT_PROVIDER_DEFINE(vfs); +SDT_PROBE_DEFINE2(vfs, , stat, mode, "char *", "int"); +SDT_PROBE_DEFINE2(vfs, , stat, reg, "char *", "int"); + +static int kern_chflagsat(struct thread *td, int fd, const char *path, + enum uio_seg pathseg, u_long flags, int atflag); +static int setfflags(struct thread *td, struct vnode *, u_long); +static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); +static int getutimens(const struct timespec *, enum uio_seg, + struct timespec *, int *); +static int setutimes(struct thread *td, struct vnode *, + const struct timespec *, int, int); +static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, + struct thread *td); +static int kern_fhlinkat(struct thread *td, int fd, const char *path, + enum uio_seg pathseg, fhandle_t *fhp); +static int kern_getfhat(struct thread *td, int flags, int fd, + const char *path, enum uio_seg pathseg, fhandle_t *fhp); +static int kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, + size_t count, struct thread *td); +static int kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, + const char *path, enum uio_seg segflag); + +/* + * Sync each mounted filesystem. + */ +#ifndef _SYS_SYSPROTO_H_ +struct sync_args { + int dummy; +}; +#endif +/* ARGSUSED */ +int +sys_sync(struct thread *td, struct sync_args *uap) +{ + struct mount *mp, *nmp; + int save; + + mtx_lock(&mountlist_mtx); + for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { + if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { + nmp = TAILQ_NEXT(mp, mnt_list); + continue; + } + if ((mp->mnt_flag & MNT_RDONLY) == 0 && + vn_start_write(NULL, &mp, V_NOWAIT) == 0) { + save = curthread_pflags_set(TDP_SYNCIO); + vfs_msync(mp, MNT_NOWAIT); + VFS_SYNC(mp, MNT_NOWAIT); + curthread_pflags_restore(save); + vn_finished_write(mp); + } + mtx_lock(&mountlist_mtx); + nmp = TAILQ_NEXT(mp, mnt_list); + vfs_unbusy(mp); + } + mtx_unlock(&mountlist_mtx); + return (0); +} + +/* + * Change filesystem quotas. + */ +#ifndef _SYS_SYSPROTO_H_ +struct quotactl_args { + char *path; + int cmd; + int uid; + caddr_t arg; +}; +#endif +int +sys_quotactl(struct thread *td, struct quotactl_args *uap) +{ + struct mount *mp; + struct nameidata nd; + int error; + + AUDIT_ARG_CMD(uap->cmd); + AUDIT_ARG_UID(uap->uid); + if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) + return (EPERM); + NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, + uap->path, td); + if ((error = namei(&nd)) != 0) + return (error); + NDFREE(&nd, NDF_ONLY_PNBUF); + mp = nd.ni_vp->v_mount; + vfs_ref(mp); + vput(nd.ni_vp); + error = vfs_busy(mp, 0); + vfs_rel(mp); + if (error != 0) + return (error); + error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg); + + /* + * Since quota on operation typically needs to open quota + * file, the Q_QUOTAON handler needs to unbusy the mount point + * before calling into namei. Otherwise, unmount might be + * started between two vfs_busy() invocations (first is our, + * second is from mount point cross-walk code in lookup()), + * causing deadlock. + * + * Require that Q_QUOTAON handles the vfs_busy() reference on + * its own, always returning with ubusied mount point. + */ + if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON && + (uap->cmd >> SUBCMDSHIFT) != Q_QUOTAOFF) + vfs_unbusy(mp); + return (error); +} + +/* + * Used by statfs conversion routines to scale the block size up if + * necessary so that all of the block counts are <= 'max_size'. Note + * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero + * value of 'n'. + */ +void +statfs_scale_blocks(struct statfs *sf, long max_size) +{ + uint64_t count; + int shift; + + KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); + + /* + * Attempt to scale the block counts to give a more accurate + * overview to userland of the ratio of free space to used + * space. To do this, find the largest block count and compute + * a divisor that lets it fit into a signed integer <= max_size. + */ + if (sf->f_bavail < 0) + count = -sf->f_bavail; + else + count = sf->f_bavail; + count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); + if (count <= max_size) + return; + + count >>= flsl(max_size); + shift = 0; + while (count > 0) { + shift++; + count >>=1; + } + + sf->f_bsize <<= shift; + sf->f_blocks >>= shift; + sf->f_bfree >>= shift; + sf->f_bavail >>= shift; +} + +static int +kern_do_statfs(struct thread *td, struct mount *mp, struct statfs *buf) +{ + struct statfs *sp; + int error; + + if (mp == NULL) + return (EBADF); + error = vfs_busy(mp, 0); + vfs_rel(mp); + if (error != 0) + return (error); +#ifdef MAC + error = mac_mount_check_stat(td->td_ucred, mp); + if (error != 0) + goto out; +#endif + /* + * Set these in case the underlying filesystem fails to do so. + */ + sp = &mp->mnt_stat; + sp->f_version = STATFS_VERSION; + sp->f_namemax = NAME_MAX; + sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; + error = VFS_STATFS(mp, sp); + if (error != 0) + goto out; + *buf = *sp; + if (priv_check(td, PRIV_VFS_GENERATION)) { + buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; + prison_enforce_statfs(td->td_ucred, mp, buf); + } +out: + vfs_unbusy(mp); + return (error); +} + +/* + * Get filesystem statistics. + */ +#ifndef _SYS_SYSPROTO_H_ +struct statfs_args { + char *path; + struct statfs *buf; +}; +#endif +int +sys_statfs(struct thread *td, struct statfs_args *uap) +{ + struct statfs *sfp; + int error; + + sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); + error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); + if (error == 0) + error = copyout(sfp, uap->buf, sizeof(struct statfs)); + free(sfp, M_STATFS); + return (error); +} + +int +kern_statfs(struct thread *td, char *path, enum uio_seg pathseg, + struct statfs *buf) +{ + struct mount *mp; + struct nameidata nd; + int error; + + NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, + pathseg, path, td); + error = namei(&nd); + if (error != 0) + return (error); + mp = nd.ni_vp->v_mount; + vfs_ref(mp); + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_vp); + return (kern_do_statfs(td, mp, buf)); +} + +/* + * Get filesystem statistics. + */ +#ifndef _SYS_SYSPROTO_H_ +struct fstatfs_args { + int fd; + struct statfs *buf; +}; +#endif +int +sys_fstatfs(struct thread *td, struct fstatfs_args *uap) +{ + struct statfs *sfp; + int error; + + sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); + error = kern_fstatfs(td, uap->fd, sfp); + if (error == 0) + error = copyout(sfp, uap->buf, sizeof(struct statfs)); + free(sfp, M_STATFS); + return (error); +} + +int +kern_fstatfs(struct thread *td, int fd, struct statfs *buf) +{ + struct file *fp; + struct mount *mp; + struct vnode *vp; + int error; + + AUDIT_ARG_FD(fd); + error = getvnode(td, fd, &cap_fstatfs_rights, &fp); + if (error != 0) + return (error); + vp = fp->f_vnode; + vn_lock(vp, LK_SHARED | LK_RETRY); +#ifdef AUDIT + AUDIT_ARG_VNODE1(vp); +#endif + mp = vp->v_mount; + if (mp != NULL) + vfs_ref(mp); + VOP_UNLOCK(vp, 0); + fdrop(fp, td); + return (kern_do_statfs(td, mp, buf)); +} + +/* + * Get statistics on all filesystems. + */ +#ifndef _SYS_SYSPROTO_H_ +struct getfsstat_args { + struct statfs *buf; + long bufsize; + int mode; +}; +#endif +int +sys_getfsstat(struct thread *td, struct getfsstat_args *uap) +{ + size_t count; + int error; + + if (uap->bufsize < 0 || uap->bufsize > SIZE_MAX) + return (EINVAL); + error = kern_getfsstat(td, &uap->buf, uap->bufsize, &count, + UIO_USERSPACE, uap->mode); + if (error == 0) + td->td_retval[0] = count; + return (error); +} + +/* + * If (bufsize > 0 && bufseg == UIO_SYSSPACE) + * The caller is responsible for freeing memory which will be allocated + * in '*buf'. + */ +int +kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, + size_t *countp, enum uio_seg bufseg, int mode) +{ + struct mount *mp, *nmp; + struct statfs *sfsp, *sp, *sptmp, *tofree; + size_t count, maxcount; + int error; + + switch (mode) { + case MNT_WAIT: + case MNT_NOWAIT: + break; + default: + if (bufseg == UIO_SYSSPACE) + *buf = NULL; + return (EINVAL); + } +restart: + maxcount = bufsize / sizeof(struct statfs); + if (bufsize == 0) { + sfsp = NULL; + tofree = NULL; + } else if (bufseg == UIO_USERSPACE) { + sfsp = *buf; + tofree = NULL; + } else /* if (bufseg == UIO_SYSSPACE) */ { + count = 0; + mtx_lock(&mountlist_mtx); + TAILQ_FOREACH(mp, &mountlist, mnt_list) { + count++; + } + mtx_unlock(&mountlist_mtx); + if (maxcount > count) + maxcount = count; + tofree = sfsp = *buf = malloc(maxcount * sizeof(struct statfs), + M_STATFS, M_WAITOK); + } + count = 0; + mtx_lock(&mountlist_mtx); + for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { + if (prison_canseemount(td->td_ucred, mp) != 0) { + nmp = TAILQ_NEXT(mp, mnt_list); + continue; + } +#ifdef MAC + if (mac_mount_check_stat(td->td_ucred, mp) != 0) { + nmp = TAILQ_NEXT(mp, mnt_list); + continue; + } +#endif + if (mode == MNT_WAIT) { + if (vfs_busy(mp, MBF_MNTLSTLOCK) != 0) { + /* + * If vfs_busy() failed, and MBF_NOWAIT + * wasn't passed, then the mp is gone. + * Furthermore, because of MBF_MNTLSTLOCK, + * the mountlist_mtx was dropped. We have + * no other choice than to start over. + */ + mtx_unlock(&mountlist_mtx); + free(tofree, M_STATFS); + goto restart; + } + } else { + if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK) != 0) { + nmp = TAILQ_NEXT(mp, mnt_list); + continue; + } + } + if (sfsp != NULL && count < maxcount) { + sp = &mp->mnt_stat; + /* + * Set these in case the underlying filesystem + * fails to do so. + */ + sp->f_version = STATFS_VERSION; + sp->f_namemax = NAME_MAX; + sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; + /* + * If MNT_NOWAIT is specified, do not refresh + * the fsstat cache. + */ + if (mode != MNT_NOWAIT) { + error = VFS_STATFS(mp, sp); + if (error != 0) { + mtx_lock(&mountlist_mtx); + nmp = TAILQ_NEXT(mp, mnt_list); + vfs_unbusy(mp); + continue; + } + } + if (priv_check(td, PRIV_VFS_GENERATION)) { + sptmp = malloc(sizeof(struct statfs), M_STATFS, + M_WAITOK); + *sptmp = *sp; + sptmp->f_fsid.val[0] = sptmp->f_fsid.val[1] = 0; + prison_enforce_statfs(td->td_ucred, mp, sptmp); + sp = sptmp; + } else + sptmp = NULL; + if (bufseg == UIO_SYSSPACE) { + bcopy(sp, sfsp, sizeof(*sp)); + free(sptmp, M_STATFS); + } else /* if (bufseg == UIO_USERSPACE) */ { + error = copyout(sp, sfsp, sizeof(*sp)); + free(sptmp, M_STATFS); + if (error != 0) { + vfs_unbusy(mp); + return (error); + } + } + sfsp++; + } + count++; + mtx_lock(&mountlist_mtx); + nmp = TAILQ_NEXT(mp, mnt_list); + vfs_unbusy(mp); + } + mtx_unlock(&mountlist_mtx); + if (sfsp != NULL && count > maxcount) + *countp = maxcount; + else + *countp = count; + return (0); +} + +#ifdef COMPAT_FREEBSD4 +/* + * Get old format filesystem statistics. + */ +static void freebsd4_cvtstatfs(struct statfs *, struct ostatfs *); + +#ifndef _SYS_SYSPROTO_H_ +struct freebsd4_statfs_args { + char *path; + struct ostatfs *buf; +}; +#endif +int +freebsd4_statfs(struct thread *td, struct freebsd4_statfs_args *uap) +{ + struct ostatfs osb; + struct statfs *sfp; + int error; + + sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); + error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); + if (error == 0) { + freebsd4_cvtstatfs(sfp, &osb); + error = copyout(&osb, uap->buf, sizeof(osb)); + } + free(sfp, M_STATFS); + return (error); +} + +/* + * Get filesystem statistics. + */ +#ifndef _SYS_SYSPROTO_H_ +struct freebsd4_fstatfs_args { + int fd; + struct ostatfs *buf; +}; +#endif +int +freebsd4_fstatfs(struct thread *td, struct freebsd4_fstatfs_args *uap) +{ + struct ostatfs osb; + struct statfs *sfp; + int error; + + sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); + error = kern_fstatfs(td, uap->fd, sfp); + if (error == 0) { + freebsd4_cvtstatfs(sfp, &osb); + error = copyout(&osb, uap->buf, sizeof(osb)); + } + free(sfp, M_STATFS); + return (error); +} + +/* + * Get statistics on all filesystems. + */ +#ifndef _SYS_SYSPROTO_H_ +struct freebsd4_getfsstat_args { + struct ostatfs *buf; + long bufsize; + int mode; +}; +#endif +int +freebsd4_getfsstat(struct thread *td, struct freebsd4_getfsstat_args *uap) +{ + struct statfs *buf, *sp; + struct ostatfs osb; + size_t count, size; + int error; + + if (uap->bufsize < 0) + return (EINVAL); + count = uap->bufsize / sizeof(struct ostatfs); + if (count > SIZE_MAX / sizeof(struct statfs)) + return (EINVAL); + size = count * sizeof(struct statfs); + error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, + uap->mode); + if (error == 0) + td->td_retval[0] = count; + if (size != 0) { + sp = buf; + while (count != 0 && error == 0) { + freebsd4_cvtstatfs(sp, &osb); + error = copyout(&osb, uap->buf, sizeof(osb)); + sp++; + uap->buf++; + count--; + } + free(buf, M_STATFS); + } + return (error); +} + +/* + * Implement fstatfs() for (NFS) file handles. + */ +#ifndef _SYS_SYSPROTO_H_ +struct freebsd4_fhstatfs_args { + struct fhandle *u_fhp; + struct ostatfs *buf; +}; +#endif +int +freebsd4_fhstatfs(struct thread *td, struct freebsd4_fhstatfs_args *uap) +{ + struct ostatfs osb; + struct statfs *sfp; + fhandle_t fh; + int error; + + error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); + if (error != 0) + return (error); + sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); + error = kern_fhstatfs(td, fh, sfp); + if (error == 0) { + freebsd4_cvtstatfs(sfp, &osb); + error = copyout(&osb, uap->buf, sizeof(osb)); + } + free(sfp, M_STATFS); + return (error); +} + +/* + * Convert a new format statfs structure to an old format statfs structure. + */ +static void +freebsd4_cvtstatfs(struct statfs *nsp, struct ostatfs *osp) +{ + + statfs_scale_blocks(nsp, LONG_MAX); + bzero(osp, sizeof(*osp)); + osp->f_bsize = nsp->f_bsize; + osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); + osp->f_blocks = nsp->f_blocks; + osp->f_bfree = nsp->f_bfree; + osp->f_bavail = nsp->f_bavail; + osp->f_files = MIN(nsp->f_files, LONG_MAX); + osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); + osp->f_owner = nsp->f_owner; + osp->f_type = nsp->f_type; + osp->f_flags = nsp->f_flags; + osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); + osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); + osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); + osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); + strlcpy(osp->f_fstypename, nsp->f_fstypename, + MIN(MFSNAMELEN, OMFSNAMELEN)); + strlcpy(osp->f_mntonname, nsp->f_mntonname, + MIN(MNAMELEN, OMNAMELEN)); + strlcpy(osp->f_mntfromname, nsp->f_mntfromname, + MIN(MNAMELEN, OMNAMELEN)); + osp->f_fsid = nsp->f_fsid; +} +#endif /* COMPAT_FREEBSD4 */ + +#if defined(COMPAT_FREEBSD11) +/* + * Get old format filesystem statistics. + */ +static void freebsd11_cvtstatfs(struct statfs *, struct freebsd11_statfs *); + +int +freebsd11_statfs(struct thread *td, struct freebsd11_statfs_args *uap) +{ + struct freebsd11_statfs osb; + struct statfs *sfp; + int error; + + sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); + error = kern_statfs(td, uap->path, UIO_USERSPACE, sfp); + if (error == 0) { + freebsd11_cvtstatfs(sfp, &osb); + error = copyout(&osb, uap->buf, sizeof(osb)); + } + free(sfp, M_STATFS); + return (error); +} + +/* + * Get filesystem statistics. + */ +int +freebsd11_fstatfs(struct thread *td, struct freebsd11_fstatfs_args *uap) +{ + struct freebsd11_statfs osb; + struct statfs *sfp; + int error; + + sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); + error = kern_fstatfs(td, uap->fd, sfp); + if (error == 0) { + freebsd11_cvtstatfs(sfp, &osb); + error = copyout(&osb, uap->buf, sizeof(osb)); + } + free(sfp, M_STATFS); + return (error); +} + +/* + * Get statistics on all filesystems. + */ +int +freebsd11_getfsstat(struct thread *td, struct freebsd11_getfsstat_args *uap) +{ + struct freebsd11_statfs osb; + struct statfs *buf, *sp; + size_t count, size; + int error; + + count = uap->bufsize / sizeof(struct ostatfs); + size = count * sizeof(struct statfs); + error = kern_getfsstat(td, &buf, size, &count, UIO_SYSSPACE, + uap->mode); + if (error == 0) + td->td_retval[0] = count; + if (size > 0) { + sp = buf; + while (count > 0 && error == 0) { + freebsd11_cvtstatfs(sp, &osb); + error = copyout(&osb, uap->buf, sizeof(osb)); + sp++; + uap->buf++; + count--; + } + free(buf, M_STATFS); + } + return (error); +} + +/* + * Implement fstatfs() for (NFS) file handles. + */ +int +freebsd11_fhstatfs(struct thread *td, struct freebsd11_fhstatfs_args *uap) +{ + struct freebsd11_statfs osb; + struct statfs *sfp; + fhandle_t fh; + int error; + + error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); + if (error) + return (error); + sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); + error = kern_fhstatfs(td, fh, sfp); + if (error == 0) { + freebsd11_cvtstatfs(sfp, &osb); + error = copyout(&osb, uap->buf, sizeof(osb)); + } + free(sfp, M_STATFS); + return (error); +} + +/* + * Convert a new format statfs structure to an old format statfs structure. + */ +static void +freebsd11_cvtstatfs(struct statfs *nsp, struct freebsd11_statfs *osp) +{ + + bzero(osp, sizeof(*osp)); + osp->f_version = FREEBSD11_STATFS_VERSION; + osp->f_type = nsp->f_type; + osp->f_flags = nsp->f_flags; + osp->f_bsize = nsp->f_bsize; + osp->f_iosize = nsp->f_iosize; + osp->f_blocks = nsp->f_blocks; + osp->f_bfree = nsp->f_bfree; + osp->f_bavail = nsp->f_bavail; + osp->f_files = nsp->f_files; + osp->f_ffree = nsp->f_ffree; + osp->f_syncwrites = nsp->f_syncwrites; + osp->f_asyncwrites = nsp->f_asyncwrites; + osp->f_syncreads = nsp->f_syncreads; + osp->f_asyncreads = nsp->f_asyncreads; + osp->f_namemax = nsp->f_namemax; + osp->f_owner = nsp->f_owner; + osp->f_fsid = nsp->f_fsid; + strlcpy(osp->f_fstypename, nsp->f_fstypename, + MIN(MFSNAMELEN, sizeof(osp->f_fstypename))); + strlcpy(osp->f_mntonname, nsp->f_mntonname, + MIN(MNAMELEN, sizeof(osp->f_mntonname))); + strlcpy(osp->f_mntfromname, nsp->f_mntfromname, + MIN(MNAMELEN, sizeof(osp->f_mntfromname))); +} +#endif /* COMPAT_FREEBSD11 */ + +/* + * Change current working directory to a given file descriptor. + */ +#ifndef _SYS_SYSPROTO_H_ +struct fchdir_args { + int fd; +}; +#endif +int +sys_fchdir(struct thread *td, struct fchdir_args *uap) +{ + struct vnode *vp, *tdp; + struct mount *mp; + struct file *fp; + int error; + + AUDIT_ARG_FD(uap->fd); + error = getvnode(td, uap->fd, &cap_fchdir_rights, + &fp); + if (error != 0) + return (error); + vp = fp->f_vnode; + vrefact(vp); + fdrop(fp, td); + vn_lock(vp, LK_SHARED | LK_RETRY); + AUDIT_ARG_VNODE1(vp); + error = change_dir(vp, td); + while (!error && (mp = vp->v_mountedhere) != NULL) { + if (vfs_busy(mp, 0)) + continue; + error = VFS_ROOT(mp, LK_SHARED, &tdp); + vfs_unbusy(mp); + if (error != 0) + break; + vput(vp); + vp = tdp; + } + if (error != 0) { + vput(vp); + return (error); + } + VOP_UNLOCK(vp, 0); + pwd_chdir(td, vp); + return (0); +} + +/* + * Change current working directory (``.''). + */ +#ifndef _SYS_SYSPROTO_H_ +struct chdir_args { + char *path; +}; +#endif +int +sys_chdir(struct thread *td, struct chdir_args *uap) +{ + + return (kern_chdir(td, uap->path, UIO_USERSPACE)); +} + +int +kern_chdir(struct thread *td, char *path, enum uio_seg pathseg) +{ + struct nameidata nd; + int error; + + NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, + pathseg, path, td); + if ((error = namei(&nd)) != 0) + return (error); + if ((error = change_dir(nd.ni_vp, td)) != 0) { + vput(nd.ni_vp); + NDFREE(&nd, NDF_ONLY_PNBUF); + return (error); + } + VOP_UNLOCK(nd.ni_vp, 0); + NDFREE(&nd, NDF_ONLY_PNBUF); + pwd_chdir(td, nd.ni_vp); + return (0); +} + +/* + * Change notion of root (``/'') directory. + */ +#ifndef _SYS_SYSPROTO_H_ +struct chroot_args { + char *path; +}; +#endif +int +sys_chroot(struct thread *td, struct chroot_args *uap) +{ + struct nameidata nd; + int error; + + error = priv_check(td, PRIV_VFS_CHROOT); + if (error != 0) + return (error); + NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, + UIO_USERSPACE, uap->path, td); + error = namei(&nd); + if (error != 0) + goto error; + error = change_dir(nd.ni_vp, td); + if (error != 0) + goto e_vunlock; +#ifdef MAC + error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp); + if (error != 0) + goto e_vunlock; +#endif + VOP_UNLOCK(nd.ni_vp, 0); + error = pwd_chroot(td, nd.ni_vp); + vrele(nd.ni_vp); + NDFREE(&nd, NDF_ONLY_PNBUF); + return (error); +e_vunlock: + vput(nd.ni_vp); +error: + NDFREE(&nd, NDF_ONLY_PNBUF); + return (error); +} + +/* + * Common routine for chroot and chdir. Callers must provide a locked vnode + * instance. + */ +int +change_dir(struct vnode *vp, struct thread *td) +{ +#ifdef MAC + int error; +#endif + + ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); + if (vp->v_type != VDIR) + return (ENOTDIR); +#ifdef MAC + error = mac_vnode_check_chdir(td->td_ucred, vp); + if (error != 0) + return (error); +#endif + return (VOP_ACCESS(vp, VEXEC, td->td_ucred, td)); +} + +static __inline void +flags_to_rights(int flags, cap_rights_t *rightsp) +{ + + if (flags & O_EXEC) { + cap_rights_set(rightsp, CAP_FEXECVE); + } else { + switch ((flags & O_ACCMODE)) { + case O_RDONLY: + cap_rights_set(rightsp, CAP_READ); + break; + case O_RDWR: + cap_rights_set(rightsp, CAP_READ); + /* FALLTHROUGH */ + case O_WRONLY: + cap_rights_set(rightsp, CAP_WRITE); + if (!(flags & (O_APPEND | O_TRUNC))) + cap_rights_set(rightsp, CAP_SEEK); + break; + } + } + + if (flags & O_CREAT) + cap_rights_set(rightsp, CAP_CREATE); + + if (flags & O_TRUNC) + cap_rights_set(rightsp, CAP_FTRUNCATE); + + if (flags & (O_SYNC | O_FSYNC)) + cap_rights_set(rightsp, CAP_FSYNC); + + if (flags & (O_EXLOCK | O_SHLOCK)) + cap_rights_set(rightsp, CAP_FLOCK); +} + +/* + * Check permissions, allocate an open file structure, and call the device + * open routine if any. + */ +#ifndef _SYS_SYSPROTO_H_ +struct open_args { + char *path; + int flags; + int mode; +}; +#endif +int +sys_open(struct thread *td, struct open_args *uap) +{ + + return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + uap->flags, uap->mode)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct openat_args { + int fd; + char *path; + int flag; + int mode; +}; +#endif +int +sys_openat(struct thread *td, struct openat_args *uap) +{ + + AUDIT_ARG_FD(uap->fd); + return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, + uap->mode)); +} + +int +kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg, + int flags, int mode) +{ + struct proc *p = td->td_proc; + struct filedesc *fdp = p->p_fd; + struct file *fp; + struct vnode *vp; + struct nameidata nd; + cap_rights_t rights; + int cmode, error, indx; + + indx = -1; + + AUDIT_ARG_FFLAGS(flags); + AUDIT_ARG_MODE(mode); + cap_rights_init(&rights, CAP_LOOKUP); + flags_to_rights(flags, &rights); + /* + * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags + * may be specified. + */ + if (flags & O_EXEC) { + if (flags & O_ACCMODE) + return (EINVAL); + } else if ((flags & O_ACCMODE) == O_ACCMODE) { + return (EINVAL); + } else { + flags = FFLAGS(flags); + } + + /* + * Allocate a file structure. The descriptor to reference it + * is allocated and set by finstall() below. + */ + error = falloc_noinstall(td, &fp); + if (error != 0) + return (error); + /* + * An extra reference on `fp' has been held for us by + * falloc_noinstall(). + */ + /* Set the flags early so the finit in devfs can pick them up. */ + fp->f_flag = flags & FMASK; + cmode = ((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT; + NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, + &rights, td); + td->td_dupfd = -1; /* XXX check for fdopen */ + error = vn_open(&nd, &flags, cmode, fp); + if (error != 0) { + /* + * If the vn_open replaced the method vector, something + * wonderous happened deep below and we just pass it up + * pretending we know what we do. + */ + if (error == ENXIO && fp->f_ops != &badfileops) + goto success; + + /* + * Handle special fdopen() case. bleh. + * + * Don't do this for relative (capability) lookups; we don't + * understand exactly what would happen, and we don't think + * that it ever should. + */ + if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) == 0 && + (error == ENODEV || error == ENXIO) && + td->td_dupfd >= 0) { + error = dupfdopen(td, fdp, td->td_dupfd, flags, error, + &indx); + if (error == 0) + goto success; + } + + goto bad; + } + td->td_dupfd = 0; + NDFREE(&nd, NDF_ONLY_PNBUF); + vp = nd.ni_vp; + + /* + * Store the vnode, for any f_type. Typically, the vnode use + * count is decremented by direct call to vn_closefile() for + * files that switched type in the cdevsw fdopen() method. + */ + fp->f_vnode = vp; + /* + * If the file wasn't claimed by devfs bind it to the normal + * vnode operations here. + */ + if (fp->f_ops == &badfileops) { + KASSERT(vp->v_type != VFIFO, ("Unexpected fifo.")); + fp->f_seqcount = 1; + finit(fp, (flags & FMASK) | (fp->f_flag & FHASLOCK), + DTYPE_VNODE, vp, &vnops); + } + + VOP_UNLOCK(vp, 0); + if (flags & O_TRUNC) { + error = fo_truncate(fp, 0, td->td_ucred, td); + if (error != 0) + goto bad; + } +success: + /* + * If we haven't already installed the FD (for dupfdopen), do so now. + */ + if (indx == -1) { + struct filecaps *fcaps; + +#ifdef CAPABILITIES + if ((nd.ni_lcf & NI_LCF_STRICTRELATIVE) != 0) + fcaps = &nd.ni_filecaps; + else +#endif + fcaps = NULL; + error = finstall(td, fp, &indx, flags, fcaps); + /* On success finstall() consumes fcaps. */ + if (error != 0) { + filecaps_free(&nd.ni_filecaps); + goto bad; + } + } else { + filecaps_free(&nd.ni_filecaps); + } + + /* + * Release our private reference, leaving the one associated with + * the descriptor table intact. + */ + fdrop(fp, td); + td->td_retval[0] = indx; + return (0); +bad: + KASSERT(indx == -1, ("indx=%d, should be -1", indx)); + fdrop(fp, td); + return (error); +} + +#ifdef COMPAT_43 +/* + * Create a file. + */ +#ifndef _SYS_SYSPROTO_H_ +struct ocreat_args { + char *path; + int mode; +}; +#endif +int +ocreat(struct thread *td, struct ocreat_args *uap) +{ + + return (kern_openat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); +} +#endif /* COMPAT_43 */ + +/* + * Create a special file. + */ +#ifndef _SYS_SYSPROTO_H_ +struct mknodat_args { + int fd; + char *path; + mode_t mode; + dev_t dev; +}; +#endif +int +sys_mknodat(struct thread *td, struct mknodat_args *uap) +{ + + return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, + uap->dev)); +} + +#if defined(COMPAT_FREEBSD11) +int +freebsd11_mknod(struct thread *td, + struct freebsd11_mknod_args *uap) +{ + + return (kern_mknodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + uap->mode, uap->dev)); +} + +int +freebsd11_mknodat(struct thread *td, + struct freebsd11_mknodat_args *uap) +{ + + return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, + uap->dev)); +} +#endif /* COMPAT_FREEBSD11 */ + +int +kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, + int mode, dev_t dev) +{ + struct vnode *vp; + struct mount *mp; + struct vattr vattr; + struct nameidata nd; + int error, whiteout = 0; + + AUDIT_ARG_MODE(mode); + AUDIT_ARG_DEV(dev); + switch (mode & S_IFMT) { + case S_IFCHR: + case S_IFBLK: + error = priv_check(td, PRIV_VFS_MKNOD_DEV); + if (error == 0 && dev == VNOVAL) + error = EINVAL; + break; + case S_IFWHT: + error = priv_check(td, PRIV_VFS_MKNOD_WHT); + break; + case S_IFIFO: + if (dev == 0) + return (kern_mkfifoat(td, fd, path, pathseg, mode)); + /* FALLTHROUGH */ + default: + error = EINVAL; + break; + } + if (error != 0) + return (error); +restart: + bwillwrite(); + NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | + NOCACHE, pathseg, path, fd, &cap_mknodat_rights, + td); + if ((error = namei(&nd)) != 0) + return (error); + vp = nd.ni_vp; + if (vp != NULL) { + NDFREE(&nd, NDF_ONLY_PNBUF); + if (vp == nd.ni_dvp) + vrele(nd.ni_dvp); + else + vput(nd.ni_dvp); + vrele(vp); + return (EEXIST); + } else { + VATTR_NULL(&vattr); + vattr.va_mode = (mode & ALLPERMS) & + ~td->td_proc->p_fd->fd_cmask; + vattr.va_rdev = dev; + whiteout = 0; + + switch (mode & S_IFMT) { + case S_IFCHR: + vattr.va_type = VCHR; + break; + case S_IFBLK: + vattr.va_type = VBLK; + break; + case S_IFWHT: + whiteout = 1; + break; + default: + panic("kern_mknod: invalid mode"); + } + } + if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) + return (error); + goto restart; + } +#ifdef MAC + if (error == 0 && !whiteout) + error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, + &nd.ni_cnd, &vattr); +#endif + if (error == 0) { + if (whiteout) + error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); + else { + error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, + &nd.ni_cnd, &vattr); + if (error == 0) + vput(nd.ni_vp); + } + } + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + vn_finished_write(mp); + return (error); +} + +/* + * Create a named pipe. + */ +#ifndef _SYS_SYSPROTO_H_ +struct mkfifo_args { + char *path; + int mode; +}; +#endif +int +sys_mkfifo(struct thread *td, struct mkfifo_args *uap) +{ + + return (kern_mkfifoat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + uap->mode)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct mkfifoat_args { + int fd; + char *path; + mode_t mode; +}; +#endif +int +sys_mkfifoat(struct thread *td, struct mkfifoat_args *uap) +{ + + return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, + uap->mode)); +} + +int +kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg, + int mode) +{ + struct mount *mp; + struct vattr vattr; + struct nameidata nd; + int error; + + AUDIT_ARG_MODE(mode); +restart: + bwillwrite(); + NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | + NOCACHE, pathseg, path, fd, &cap_mkfifoat_rights, + td); + if ((error = namei(&nd)) != 0) + return (error); + if (nd.ni_vp != NULL) { + NDFREE(&nd, NDF_ONLY_PNBUF); + if (nd.ni_vp == nd.ni_dvp) + vrele(nd.ni_dvp); + else + vput(nd.ni_dvp); + vrele(nd.ni_vp); + return (EEXIST); + } + if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) + return (error); + goto restart; + } + VATTR_NULL(&vattr); + vattr.va_type = VFIFO; + vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; +#ifdef MAC + error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, + &vattr); + if (error != 0) + goto out; +#endif + error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); + if (error == 0) + vput(nd.ni_vp); +#ifdef MAC +out: +#endif + vput(nd.ni_dvp); + vn_finished_write(mp); + NDFREE(&nd, NDF_ONLY_PNBUF); + return (error); +} + +/* + * Make a hard file link. + */ +#ifndef _SYS_SYSPROTO_H_ +struct link_args { + char *path; + char *link; +}; +#endif +int +sys_link(struct thread *td, struct link_args *uap) +{ + + return (kern_linkat(td, AT_FDCWD, AT_FDCWD, uap->path, uap->link, + UIO_USERSPACE, FOLLOW)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct linkat_args { + int fd1; + char *path1; + int fd2; + char *path2; + int flag; +}; +#endif +int +sys_linkat(struct thread *td, struct linkat_args *uap) +{ + int flag; + + flag = uap->flag; + if (flag & ~AT_SYMLINK_FOLLOW) + return (EINVAL); + + return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, + UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW)); +} + +int hardlink_check_uid = 0; +SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, + &hardlink_check_uid, 0, + "Unprivileged processes cannot create hard links to files owned by other " + "users"); +static int hardlink_check_gid = 0; +SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, + &hardlink_check_gid, 0, + "Unprivileged processes cannot create hard links to files owned by other " + "groups"); + +static int +can_hardlink(struct vnode *vp, struct ucred *cred) +{ + struct vattr va; + int error; + + if (!hardlink_check_uid && !hardlink_check_gid) + return (0); + + error = VOP_GETATTR(vp, &va, cred); + if (error != 0) + return (error); + + if (hardlink_check_uid && cred->cr_uid != va.va_uid) { + error = priv_check_cred(cred, PRIV_VFS_LINK, 0); + if (error != 0) + return (error); + } + + if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { + error = priv_check_cred(cred, PRIV_VFS_LINK, 0); + if (error != 0) + return (error); + } + + return (0); +} + +int +kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2, + enum uio_seg segflag, int follow) +{ + struct nameidata nd; + int error; + + do { + bwillwrite(); + NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, segflag, + path1, fd1, &cap_linkat_source_rights, td); + if ((error = namei(&nd)) != 0) + return (error); + NDFREE(&nd, NDF_ONLY_PNBUF); + error = kern_linkat_vp(td, nd.ni_vp, fd2, path2, segflag); + } while (error == EAGAIN); + return (error); +} + +static int +kern_linkat_vp(struct thread *td, struct vnode *vp, int fd, const char *path, + enum uio_seg segflag) +{ + struct nameidata nd; + struct mount *mp; + int error; + + if (vp->v_type == VDIR) { + vrele(vp); + return (EPERM); /* POSIX */ + } + NDINIT_ATRIGHTS(&nd, CREATE, + LOCKPARENT | SAVENAME | AUDITVNODE2 | NOCACHE, segflag, path, fd, + &cap_linkat_target_rights, td); + if ((error = namei(&nd)) == 0) { + if (nd.ni_vp != NULL) { + NDFREE(&nd, NDF_ONLY_PNBUF); + if (nd.ni_dvp == nd.ni_vp) + vrele(nd.ni_dvp); + else + vput(nd.ni_dvp); + vrele(nd.ni_vp); + vrele(vp); + return (EEXIST); + } else if (nd.ni_dvp->v_mount != vp->v_mount) { + /* + * Cross-device link. No need to recheck + * vp->v_type, since it cannot change, except + * to VBAD. + */ + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + vrele(vp); + return (EXDEV); + } else if ((error = vn_lock(vp, LK_EXCLUSIVE)) == 0) { + error = can_hardlink(vp, td->td_ucred); +#ifdef MAC + if (error == 0) + error = mac_vnode_check_link(td->td_ucred, + nd.ni_dvp, vp, &nd.ni_cnd); +#endif + if (error != 0) { + vput(vp); + vput(nd.ni_dvp); + NDFREE(&nd, NDF_ONLY_PNBUF); + return (error); + } + error = vn_start_write(vp, &mp, V_NOWAIT); + if (error != 0) { + vput(vp); + vput(nd.ni_dvp); + NDFREE(&nd, NDF_ONLY_PNBUF); + error = vn_start_write(NULL, &mp, + V_XSLEEP | PCATCH); + if (error != 0) + return (error); + return (EAGAIN); + } + error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); + VOP_UNLOCK(vp, 0); + vput(nd.ni_dvp); + vn_finished_write(mp); + NDFREE(&nd, NDF_ONLY_PNBUF); + } else { + vput(nd.ni_dvp); + NDFREE(&nd, NDF_ONLY_PNBUF); + vrele(vp); + return (EAGAIN); + } + } + vrele(vp); + return (error); +} + +/* + * Make a symbolic link. + */ +#ifndef _SYS_SYSPROTO_H_ +struct symlink_args { + char *path; + char *link; +}; +#endif +int +sys_symlink(struct thread *td, struct symlink_args *uap) +{ + + return (kern_symlinkat(td, uap->path, AT_FDCWD, uap->link, + UIO_USERSPACE)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct symlinkat_args { + char *path; + int fd; + char *path2; +}; +#endif +int +sys_symlinkat(struct thread *td, struct symlinkat_args *uap) +{ + + return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, + UIO_USERSPACE)); +} + +int +kern_symlinkat(struct thread *td, char *path1, int fd, char *path2, + enum uio_seg segflg) +{ + struct mount *mp; + struct vattr vattr; + char *syspath; + struct nameidata nd; + int error; + + if (segflg == UIO_SYSSPACE) { + syspath = path1; + } else { + syspath = uma_zalloc(namei_zone, M_WAITOK); + if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0) + goto out; + } + AUDIT_ARG_TEXT(syspath); +restart: + bwillwrite(); + NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | + NOCACHE, segflg, path2, fd, &cap_symlinkat_rights, + td); + if ((error = namei(&nd)) != 0) + goto out; + if (nd.ni_vp) { + NDFREE(&nd, NDF_ONLY_PNBUF); + if (nd.ni_vp == nd.ni_dvp) + vrele(nd.ni_dvp); + else + vput(nd.ni_dvp); + vrele(nd.ni_vp); + error = EEXIST; + goto out; + } + if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) + goto out; + goto restart; + } + VATTR_NULL(&vattr); + vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; +#ifdef MAC + vattr.va_type = VLNK; + error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, + &vattr); + if (error != 0) + goto out2; +#endif + error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); + if (error == 0) + vput(nd.ni_vp); +#ifdef MAC +out2: +#endif + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + vn_finished_write(mp); +out: + if (segflg != UIO_SYSSPACE) + uma_zfree(namei_zone, syspath); + return (error); +} + +/* + * Delete a whiteout from the filesystem. + */ +#ifndef _SYS_SYSPROTO_H_ +struct undelete_args { + char *path; +}; +#endif +int +sys_undelete(struct thread *td, struct undelete_args *uap) +{ + struct mount *mp; + struct nameidata nd; + int error; + +restart: + bwillwrite(); + NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1, + UIO_USERSPACE, uap->path, td); + error = namei(&nd); + if (error != 0) + return (error); + + if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { + NDFREE(&nd, NDF_ONLY_PNBUF); + if (nd.ni_vp == nd.ni_dvp) + vrele(nd.ni_dvp); + else + vput(nd.ni_dvp); + if (nd.ni_vp) + vrele(nd.ni_vp); + return (EEXIST); + } + if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) + return (error); + goto restart; + } + error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + vn_finished_write(mp); + return (error); +} + +/* + * Delete a name from the filesystem. + */ +#ifndef _SYS_SYSPROTO_H_ +struct unlink_args { + char *path; +}; +#endif +int +sys_unlink(struct thread *td, struct unlink_args *uap) +{ + + return (kern_unlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, 0)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct unlinkat_args { + int fd; + char *path; + int flag; +}; +#endif +int +sys_unlinkat(struct thread *td, struct unlinkat_args *uap) +{ + int flag = uap->flag; + int fd = uap->fd; + char *path = uap->path; + + if (flag & ~AT_REMOVEDIR) + return (EINVAL); + + if (flag & AT_REMOVEDIR) + return (kern_rmdirat(td, fd, path, UIO_USERSPACE)); + else + return (kern_unlinkat(td, fd, path, UIO_USERSPACE, 0)); +} + +int +kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, + ino_t oldinum) +{ + struct mount *mp; + struct vnode *vp; + struct nameidata nd; + struct stat sb; + int error; + +restart: + bwillwrite(); + NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1, + pathseg, path, fd, &cap_unlinkat_rights, td); + if ((error = namei(&nd)) != 0) + return (error == EINVAL ? EPERM : error); + vp = nd.ni_vp; + if (vp->v_type == VDIR && oldinum == 0) { + error = EPERM; /* POSIX */ + } else if (oldinum != 0 && + ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) && + sb.st_ino != oldinum) { + error = EIDRM; /* Identifier removed */ + } else { + /* + * The root of a mounted filesystem cannot be deleted. + * + * XXX: can this only be a VDIR case? + */ + if (vp->v_vflag & VV_ROOT) + error = EBUSY; + } + if (error == 0) { + if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + if (vp == nd.ni_dvp) + vrele(vp); + else + vput(vp); + if ((error = vn_start_write(NULL, &mp, + V_XSLEEP | PCATCH)) != 0) + return (error); + goto restart; + } +#ifdef MAC + error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, + &nd.ni_cnd); + if (error != 0) + goto out; +#endif + vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); + error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); +#ifdef MAC +out: +#endif + vn_finished_write(mp); + } + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + if (vp == nd.ni_dvp) + vrele(vp); + else + vput(vp); + return (error); +} + +/* + * Reposition read/write file offset. + */ +#ifndef _SYS_SYSPROTO_H_ +struct lseek_args { + int fd; + int pad; + off_t offset; + int whence; +}; +#endif +int +sys_lseek(struct thread *td, struct lseek_args *uap) +{ + + return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); +} + +int +kern_lseek(struct thread *td, int fd, off_t offset, int whence) +{ + struct file *fp; + int error; + + AUDIT_ARG_FD(fd); + error = fget(td, fd, &cap_seek_rights, &fp); + if (error != 0) + return (error); + error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? + fo_seek(fp, offset, whence, td) : ESPIPE; + fdrop(fp, td); + return (error); +} + +#if defined(COMPAT_43) +/* + * Reposition read/write file offset. + */ +#ifndef _SYS_SYSPROTO_H_ +struct olseek_args { + int fd; + long offset; + int whence; +}; +#endif +int +olseek(struct thread *td, struct olseek_args *uap) +{ + + return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); +} +#endif /* COMPAT_43 */ + +#if defined(COMPAT_FREEBSD6) +/* Version with the 'pad' argument */ +int +freebsd6_lseek(struct thread *td, struct freebsd6_lseek_args *uap) +{ + + return (kern_lseek(td, uap->fd, uap->offset, uap->whence)); +} +#endif + +/* + * Check access permissions using passed credentials. + */ +static int +vn_access(struct vnode *vp, int user_flags, struct ucred *cred, + struct thread *td) +{ + accmode_t accmode; + int error; + + /* Flags == 0 means only check for existence. */ + if (user_flags == 0) + return (0); + + accmode = 0; + if (user_flags & R_OK) + accmode |= VREAD; + if (user_flags & W_OK) + accmode |= VWRITE; + if (user_flags & X_OK) + accmode |= VEXEC; +#ifdef MAC + error = mac_vnode_check_access(cred, vp, accmode); + if (error != 0) + return (error); +#endif + if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) + error = VOP_ACCESS(vp, accmode, cred, td); + return (error); +} + +/* + * Check access permissions using "real" credentials. + */ +#ifndef _SYS_SYSPROTO_H_ +struct access_args { + char *path; + int amode; +}; +#endif +int +sys_access(struct thread *td, struct access_args *uap) +{ + + return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + 0, uap->amode)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct faccessat_args { + int dirfd; + char *path; + int amode; + int flag; +} +#endif +int +sys_faccessat(struct thread *td, struct faccessat_args *uap) +{ + + return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, + uap->amode)); +} + +int +kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg, + int flag, int amode) +{ + struct ucred *cred, *usecred; + struct vnode *vp; + struct nameidata nd; + int error; + + if (flag & ~AT_EACCESS) + return (EINVAL); + if (amode != F_OK && (amode & ~(R_OK | W_OK | X_OK)) != 0) + return (EINVAL); + + /* + * Create and modify a temporary credential instead of one that + * is potentially shared (if we need one). + */ + cred = td->td_ucred; + if ((flag & AT_EACCESS) == 0 && + ((cred->cr_uid != cred->cr_ruid || + cred->cr_rgid != cred->cr_groups[0]))) { + usecred = crdup(cred); + usecred->cr_uid = cred->cr_ruid; + usecred->cr_groups[0] = cred->cr_rgid; + td->td_ucred = usecred; + } else + usecred = cred; + AUDIT_ARG_VALUE(amode); + NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | + AUDITVNODE1, pathseg, path, fd, &cap_fstat_rights, + td); + if ((error = namei(&nd)) != 0) + goto out; + vp = nd.ni_vp; + + error = vn_access(vp, amode, usecred, td); + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(vp); +out: + if (usecred != cred) { + td->td_ucred = cred; + crfree(usecred); + } + return (error); +} + +/* + * Check access permissions using "effective" credentials. + */ +#ifndef _SYS_SYSPROTO_H_ +struct eaccess_args { + char *path; + int amode; +}; +#endif +int +sys_eaccess(struct thread *td, struct eaccess_args *uap) +{ + + return (kern_accessat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + AT_EACCESS, uap->amode)); +} + +#if defined(COMPAT_43) +/* + * Get file status; this version follows links. + */ +#ifndef _SYS_SYSPROTO_H_ +struct ostat_args { + char *path; + struct ostat *ub; +}; +#endif +int +ostat(struct thread *td, struct ostat_args *uap) +{ + struct stat sb; + struct ostat osb; + int error; + + error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, + &sb, NULL); + if (error != 0) + return (error); + cvtstat(&sb, &osb); + return (copyout(&osb, uap->ub, sizeof (osb))); +} + +/* + * Get file status; this version does not follow links. + */ +#ifndef _SYS_SYSPROTO_H_ +struct olstat_args { + char *path; + struct ostat *ub; +}; +#endif +int +olstat(struct thread *td, struct olstat_args *uap) +{ + struct stat sb; + struct ostat osb; + int error; + + error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, + UIO_USERSPACE, &sb, NULL); + if (error != 0) + return (error); + cvtstat(&sb, &osb); + return (copyout(&osb, uap->ub, sizeof (osb))); +} + +/* + * Convert from an old to a new stat structure. + * XXX: many values are blindly truncated. + */ +void +cvtstat(struct stat *st, struct ostat *ost) +{ + + bzero(ost, sizeof(*ost)); + ost->st_dev = st->st_dev; + ost->st_ino = st->st_ino; + ost->st_mode = st->st_mode; + ost->st_nlink = st->st_nlink; + ost->st_uid = st->st_uid; + ost->st_gid = st->st_gid; + ost->st_rdev = st->st_rdev; + ost->st_size = MIN(st->st_size, INT32_MAX); + ost->st_atim = st->st_atim; + ost->st_mtim = st->st_mtim; + ost->st_ctim = st->st_ctim; + ost->st_blksize = st->st_blksize; + ost->st_blocks = st->st_blocks; + ost->st_flags = st->st_flags; + ost->st_gen = st->st_gen; +} +#endif /* COMPAT_43 */ + +#if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) +int ino64_trunc_error; +SYSCTL_INT(_vfs, OID_AUTO, ino64_trunc_error, CTLFLAG_RW, + &ino64_trunc_error, 0, + "Error on truncation of device, file or inode number, or link count"); + +int +freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost) +{ + + ost->st_dev = st->st_dev; + if (ost->st_dev != st->st_dev) { + switch (ino64_trunc_error) { + default: + /* + * Since dev_t is almost raw, don't clamp to the + * maximum for case 2, but ignore the error. + */ + break; + case 1: + return (EOVERFLOW); + } + } + ost->st_ino = st->st_ino; + if (ost->st_ino != st->st_ino) { + switch (ino64_trunc_error) { + default: + case 0: + break; + case 1: + return (EOVERFLOW); + case 2: + ost->st_ino = UINT32_MAX; + break; + } + } + ost->st_mode = st->st_mode; + ost->st_nlink = st->st_nlink; + if (ost->st_nlink != st->st_nlink) { + switch (ino64_trunc_error) { + default: + case 0: + break; + case 1: + return (EOVERFLOW); + case 2: + ost->st_nlink = UINT16_MAX; + break; + } + } + ost->st_uid = st->st_uid; + ost->st_gid = st->st_gid; + ost->st_rdev = st->st_rdev; + if (ost->st_rdev != st->st_rdev) { + switch (ino64_trunc_error) { + default: + break; + case 1: + return (EOVERFLOW); + } + } + ost->st_atim = st->st_atim; + ost->st_mtim = st->st_mtim; + ost->st_ctim = st->st_ctim; + ost->st_size = st->st_size; + ost->st_blocks = st->st_blocks; + ost->st_blksize = st->st_blksize; + ost->st_flags = st->st_flags; + ost->st_gen = st->st_gen; + ost->st_lspare = 0; + ost->st_birthtim = st->st_birthtim; + bzero((char *)&ost->st_birthtim + sizeof(ost->st_birthtim), + sizeof(*ost) - offsetof(struct freebsd11_stat, + st_birthtim) - sizeof(ost->st_birthtim)); + return (0); +} + +int +freebsd11_stat(struct thread *td, struct freebsd11_stat_args* uap) +{ + struct stat sb; + struct freebsd11_stat osb; + int error; + + error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, + &sb, NULL); + if (error != 0) + return (error); + error = freebsd11_cvtstat(&sb, &osb); + if (error == 0) + error = copyout(&osb, uap->ub, sizeof(osb)); + return (error); +} + +int +freebsd11_lstat(struct thread *td, struct freebsd11_lstat_args* uap) +{ + struct stat sb; + struct freebsd11_stat osb; + int error; + + error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, + UIO_USERSPACE, &sb, NULL); + if (error != 0) + return (error); + error = freebsd11_cvtstat(&sb, &osb); + if (error == 0) + error = copyout(&osb, uap->ub, sizeof(osb)); + return (error); +} + +int +freebsd11_fhstat(struct thread *td, struct freebsd11_fhstat_args* uap) +{ + struct fhandle fh; + struct stat sb; + struct freebsd11_stat osb; + int error; + + error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); + if (error != 0) + return (error); + error = kern_fhstat(td, fh, &sb); + if (error != 0) + return (error); + error = freebsd11_cvtstat(&sb, &osb); + if (error == 0) + error = copyout(&osb, uap->sb, sizeof(osb)); + return (error); +} + +int +freebsd11_fstatat(struct thread *td, struct freebsd11_fstatat_args* uap) +{ + struct stat sb; + struct freebsd11_stat osb; + int error; + + error = kern_statat(td, uap->flag, uap->fd, uap->path, + UIO_USERSPACE, &sb, NULL); + if (error != 0) + return (error); + error = freebsd11_cvtstat(&sb, &osb); + if (error == 0) + error = copyout(&osb, uap->buf, sizeof(osb)); + return (error); +} +#endif /* COMPAT_FREEBSD11 */ + +/* + * Get file status + */ +#ifndef _SYS_SYSPROTO_H_ +struct fstatat_args { + int fd; + char *path; + struct stat *buf; + int flag; +} +#endif +int +sys_fstatat(struct thread *td, struct fstatat_args *uap) +{ + struct stat sb; + int error; + + error = kern_statat(td, uap->flag, uap->fd, uap->path, + UIO_USERSPACE, &sb, NULL); + if (error == 0) + error = copyout(&sb, uap->buf, sizeof (sb)); + return (error); +} + +int +kern_statat(struct thread *td, int flag, int fd, char *path, + enum uio_seg pathseg, struct stat *sbp, + void (*hook)(struct vnode *vp, struct stat *sbp)) +{ + struct nameidata nd; + struct stat sb; + int error; + + if (flag & ~AT_SYMLINK_NOFOLLOW) + return (EINVAL); + + NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : + FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg, path, fd, + &cap_fstat_rights, td); + + if ((error = namei(&nd)) != 0) + return (error); + error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); + if (error == 0) { + SDT_PROBE2(vfs, , stat, mode, path, sb.st_mode); + if (S_ISREG(sb.st_mode)) + SDT_PROBE2(vfs, , stat, reg, path, pathseg); + if (__predict_false(hook != NULL)) + hook(nd.ni_vp, &sb); + } + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_vp); + if (error != 0) + return (error); +#ifdef __STAT_TIME_T_EXT + sb.st_atim_ext = 0; + sb.st_mtim_ext = 0; + sb.st_ctim_ext = 0; + sb.st_btim_ext = 0; +#endif + *sbp = sb; +#ifdef KTRACE + if (KTRPOINT(td, KTR_STRUCT)) + ktrstat(&sb); +#endif + return (0); +} + +#if defined(COMPAT_FREEBSD11) +/* + * Implementation of the NetBSD [l]stat() functions. + */ +void +freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb) +{ + + bzero(nsb, sizeof(*nsb)); + nsb->st_dev = sb->st_dev; + nsb->st_ino = sb->st_ino; + nsb->st_mode = sb->st_mode; + nsb->st_nlink = sb->st_nlink; + nsb->st_uid = sb->st_uid; + nsb->st_gid = sb->st_gid; + nsb->st_rdev = sb->st_rdev; + nsb->st_atim = sb->st_atim; + nsb->st_mtim = sb->st_mtim; + nsb->st_ctim = sb->st_ctim; + nsb->st_size = sb->st_size; + nsb->st_blocks = sb->st_blocks; + nsb->st_blksize = sb->st_blksize; + nsb->st_flags = sb->st_flags; + nsb->st_gen = sb->st_gen; + nsb->st_birthtim = sb->st_birthtim; +} + +#ifndef _SYS_SYSPROTO_H_ +struct freebsd11_nstat_args { + char *path; + struct nstat *ub; +}; +#endif +int +freebsd11_nstat(struct thread *td, struct freebsd11_nstat_args *uap) +{ + struct stat sb; + struct nstat nsb; + int error; + + error = kern_statat(td, 0, AT_FDCWD, uap->path, UIO_USERSPACE, + &sb, NULL); + if (error != 0) + return (error); + freebsd11_cvtnstat(&sb, &nsb); + return (copyout(&nsb, uap->ub, sizeof (nsb))); +} + +/* + * NetBSD lstat. Get file status; this version does not follow links. + */ +#ifndef _SYS_SYSPROTO_H_ +struct freebsd11_nlstat_args { + char *path; + struct nstat *ub; +}; +#endif +int +freebsd11_nlstat(struct thread *td, struct freebsd11_nlstat_args *uap) +{ + struct stat sb; + struct nstat nsb; + int error; + + error = kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->path, + UIO_USERSPACE, &sb, NULL); + if (error != 0) + return (error); + freebsd11_cvtnstat(&sb, &nsb); + return (copyout(&nsb, uap->ub, sizeof (nsb))); +} +#endif /* COMPAT_FREEBSD11 */ + +/* + * Get configurable pathname variables. + */ +#ifndef _SYS_SYSPROTO_H_ +struct pathconf_args { + char *path; + int name; +}; +#endif +int +sys_pathconf(struct thread *td, struct pathconf_args *uap) +{ + long value; + int error; + + error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW, + &value); + if (error == 0) + td->td_retval[0] = value; + return (error); +} + +#ifndef _SYS_SYSPROTO_H_ +struct lpathconf_args { + char *path; + int name; +}; +#endif +int +sys_lpathconf(struct thread *td, struct lpathconf_args *uap) +{ + long value; + int error; + + error = kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, + NOFOLLOW, &value); + if (error == 0) + td->td_retval[0] = value; + return (error); +} + +int +kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name, + u_long flags, long *valuep) +{ + struct nameidata nd; + int error; + + NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags, + pathseg, path, td); + if ((error = namei(&nd)) != 0) + return (error); + NDFREE(&nd, NDF_ONLY_PNBUF); + + error = VOP_PATHCONF(nd.ni_vp, name, valuep); + vput(nd.ni_vp); + return (error); +} + +/* + * Return target name of a symbolic link. + */ +#ifndef _SYS_SYSPROTO_H_ +struct readlink_args { + char *path; + char *buf; + size_t count; +}; +#endif +int +sys_readlink(struct thread *td, struct readlink_args *uap) +{ + + return (kern_readlinkat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + uap->buf, UIO_USERSPACE, uap->count)); +} +#ifndef _SYS_SYSPROTO_H_ +struct readlinkat_args { + int fd; + char *path; + char *buf; + size_t bufsize; +}; +#endif +int +sys_readlinkat(struct thread *td, struct readlinkat_args *uap) +{ + + return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, + uap->buf, UIO_USERSPACE, uap->bufsize)); +} + +int +kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, + char *buf, enum uio_seg bufseg, size_t count) +{ + struct vnode *vp; + struct nameidata nd; + int error; + + if (count > IOSIZE_MAX) + return (EINVAL); + + NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1, + pathseg, path, fd, td); + + if ((error = namei(&nd)) != 0) + return (error); + NDFREE(&nd, NDF_ONLY_PNBUF); + vp = nd.ni_vp; + + error = kern_readlink_vp(vp, buf, bufseg, count, td); + vput(vp); + + return (error); +} + +/* + * Helper function to readlink from a vnode + */ +static int +kern_readlink_vp(struct vnode *vp, char *buf, enum uio_seg bufseg, size_t count, + struct thread *td) +{ + struct iovec aiov; + struct uio auio; + int error; + + ASSERT_VOP_LOCKED(vp, "kern_readlink_vp(): vp not locked"); +#ifdef MAC + error = mac_vnode_check_readlink(td->td_ucred, vp); + if (error != 0) + return (error); +#endif + if (vp->v_type != VLNK && (vp->v_vflag & VV_READLINK) == 0) + return (EINVAL); + + aiov.iov_base = buf; + aiov.iov_len = count; + auio.uio_iov = &aiov; + auio.uio_iovcnt = 1; + auio.uio_offset = 0; + auio.uio_rw = UIO_READ; + auio.uio_segflg = bufseg; + auio.uio_td = td; + auio.uio_resid = count; + error = VOP_READLINK(vp, &auio, td->td_ucred); + td->td_retval[0] = count - auio.uio_resid; + return (error); +} + +/* + * Common implementation code for chflags() and fchflags(). + */ +static int +setfflags(struct thread *td, struct vnode *vp, u_long flags) +{ + struct mount *mp; + struct vattr vattr; + int error; + + /* We can't support the value matching VNOVAL. */ + if (flags == VNOVAL) + return (EOPNOTSUPP); + + /* + * Prevent non-root users from setting flags on devices. When + * a device is reused, users can retain ownership of the device + * if they are allowed to set flags and programs assume that + * chown can't fail when done as root. + */ + if (vp->v_type == VCHR || vp->v_type == VBLK) { + error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); + if (error != 0) + return (error); + } + + if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) + return (error); + VATTR_NULL(&vattr); + vattr.va_flags = flags; + vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); +#ifdef MAC + error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); + if (error == 0) +#endif + error = VOP_SETATTR(vp, &vattr, td->td_ucred); + VOP_UNLOCK(vp, 0); + vn_finished_write(mp); + return (error); +} + +/* + * Change flags of a file given a path name. + */ +#ifndef _SYS_SYSPROTO_H_ +struct chflags_args { + const char *path; + u_long flags; +}; +#endif +int +sys_chflags(struct thread *td, struct chflags_args *uap) +{ + + return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + uap->flags, 0)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct chflagsat_args { + int fd; + const char *path; + u_long flags; + int atflag; +} +#endif +int +sys_chflagsat(struct thread *td, struct chflagsat_args *uap) +{ + int fd = uap->fd; + const char *path = uap->path; + u_long flags = uap->flags; + int atflag = uap->atflag; + + if (atflag & ~AT_SYMLINK_NOFOLLOW) + return (EINVAL); + + return (kern_chflagsat(td, fd, path, UIO_USERSPACE, flags, atflag)); +} + +/* + * Same as chflags() but doesn't follow symlinks. + */ +#ifndef _SYS_SYSPROTO_H_ +struct lchflags_args { + const char *path; + u_long flags; +}; +#endif +int +sys_lchflags(struct thread *td, struct lchflags_args *uap) +{ + + return (kern_chflagsat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + uap->flags, AT_SYMLINK_NOFOLLOW)); +} + +static int +kern_chflagsat(struct thread *td, int fd, const char *path, + enum uio_seg pathseg, u_long flags, int atflag) +{ + struct nameidata nd; + int error, follow; + + AUDIT_ARG_FFLAGS(flags); + follow = (atflag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; + NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, + &cap_fchflags_rights, td); + if ((error = namei(&nd)) != 0) + return (error); + NDFREE(&nd, NDF_ONLY_PNBUF); + error = setfflags(td, nd.ni_vp, flags); + vrele(nd.ni_vp); + return (error); +} + +/* + * Change flags of a file given a file descriptor. + */ +#ifndef _SYS_SYSPROTO_H_ +struct fchflags_args { + int fd; + u_long flags; +}; +#endif +int +sys_fchflags(struct thread *td, struct fchflags_args *uap) +{ + struct file *fp; + int error; + + AUDIT_ARG_FD(uap->fd); + AUDIT_ARG_FFLAGS(uap->flags); + error = getvnode(td, uap->fd, &cap_fchflags_rights, + &fp); + if (error != 0) + return (error); +#ifdef AUDIT + vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); + AUDIT_ARG_VNODE1(fp->f_vnode); + VOP_UNLOCK(fp->f_vnode, 0); +#endif + error = setfflags(td, fp->f_vnode, uap->flags); + fdrop(fp, td); + return (error); +} + +/* + * Common implementation code for chmod(), lchmod() and fchmod(). + */ +int +setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode) +{ + struct mount *mp; + struct vattr vattr; + int error; + + if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) + return (error); + vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); + VATTR_NULL(&vattr); + vattr.va_mode = mode & ALLPERMS; +#ifdef MAC + error = mac_vnode_check_setmode(cred, vp, vattr.va_mode); + if (error == 0) +#endif + error = VOP_SETATTR(vp, &vattr, cred); + VOP_UNLOCK(vp, 0); + vn_finished_write(mp); + return (error); +} + +/* + * Change mode of a file given path name. + */ +#ifndef _SYS_SYSPROTO_H_ +struct chmod_args { + char *path; + int mode; +}; +#endif +int +sys_chmod(struct thread *td, struct chmod_args *uap) +{ + + return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + uap->mode, 0)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct fchmodat_args { + int dirfd; + char *path; + mode_t mode; + int flag; +} +#endif +int +sys_fchmodat(struct thread *td, struct fchmodat_args *uap) +{ + int flag = uap->flag; + int fd = uap->fd; + char *path = uap->path; + mode_t mode = uap->mode; + + if (flag & ~AT_SYMLINK_NOFOLLOW) + return (EINVAL); + + return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag)); +} + +/* + * Change mode of a file given path name (don't follow links.) + */ +#ifndef _SYS_SYSPROTO_H_ +struct lchmod_args { + char *path; + int mode; +}; +#endif +int +sys_lchmod(struct thread *td, struct lchmod_args *uap) +{ + + return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + uap->mode, AT_SYMLINK_NOFOLLOW)); +} + +int +kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, + mode_t mode, int flag) +{ + struct nameidata nd; + int error, follow; + + AUDIT_ARG_MODE(mode); + follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; + NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, + &cap_fchmod_rights, td); + if ((error = namei(&nd)) != 0) + return (error); + NDFREE(&nd, NDF_ONLY_PNBUF); + error = setfmode(td, td->td_ucred, nd.ni_vp, mode); + vrele(nd.ni_vp); + return (error); +} + +/* + * Change mode of a file given a file descriptor. + */ +#ifndef _SYS_SYSPROTO_H_ +struct fchmod_args { + int fd; + int mode; +}; +#endif +int +sys_fchmod(struct thread *td, struct fchmod_args *uap) +{ + struct file *fp; + int error; + + AUDIT_ARG_FD(uap->fd); + AUDIT_ARG_MODE(uap->mode); + + error = fget(td, uap->fd, &cap_fchmod_rights, &fp); + if (error != 0) + return (error); + error = fo_chmod(fp, uap->mode, td->td_ucred, td); + fdrop(fp, td); + return (error); +} + +/* + * Common implementation for chown(), lchown(), and fchown() + */ +int +setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid, + gid_t gid) +{ + struct mount *mp; + struct vattr vattr; + int error; + + if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) + return (error); + vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); + VATTR_NULL(&vattr); + vattr.va_uid = uid; + vattr.va_gid = gid; +#ifdef MAC + error = mac_vnode_check_setowner(cred, vp, vattr.va_uid, + vattr.va_gid); + if (error == 0) +#endif + error = VOP_SETATTR(vp, &vattr, cred); + VOP_UNLOCK(vp, 0); + vn_finished_write(mp); + return (error); +} + +/* + * Set ownership given a path name. + */ +#ifndef _SYS_SYSPROTO_H_ +struct chown_args { + char *path; + int uid; + int gid; +}; +#endif +int +sys_chown(struct thread *td, struct chown_args *uap) +{ + + return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->uid, + uap->gid, 0)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct fchownat_args { + int fd; + const char * path; + uid_t uid; + gid_t gid; + int flag; +}; +#endif +int +sys_fchownat(struct thread *td, struct fchownat_args *uap) +{ + int flag; + + flag = uap->flag; + if (flag & ~AT_SYMLINK_NOFOLLOW) + return (EINVAL); + + return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, + uap->gid, uap->flag)); +} + +int +kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg, + int uid, int gid, int flag) +{ + struct nameidata nd; + int error, follow; + + AUDIT_ARG_OWNER(uid, gid); + follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; + NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg, path, fd, + &cap_fchown_rights, td); + + if ((error = namei(&nd)) != 0) + return (error); + NDFREE(&nd, NDF_ONLY_PNBUF); + error = setfown(td, td->td_ucred, nd.ni_vp, uid, gid); + vrele(nd.ni_vp); + return (error); +} + +/* + * Set ownership given a path name, do not cross symlinks. + */ +#ifndef _SYS_SYSPROTO_H_ +struct lchown_args { + char *path; + int uid; + int gid; +}; +#endif +int +sys_lchown(struct thread *td, struct lchown_args *uap) +{ + + return (kern_fchownat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + uap->uid, uap->gid, AT_SYMLINK_NOFOLLOW)); +} + +/* + * Set ownership given a file descriptor. + */ +#ifndef _SYS_SYSPROTO_H_ +struct fchown_args { + int fd; + int uid; + int gid; +}; +#endif +int +sys_fchown(struct thread *td, struct fchown_args *uap) +{ + struct file *fp; + int error; + + AUDIT_ARG_FD(uap->fd); + AUDIT_ARG_OWNER(uap->uid, uap->gid); + error = fget(td, uap->fd, &cap_fchown_rights, &fp); + if (error != 0) + return (error); + error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td); + fdrop(fp, td); + return (error); +} + +/* + * Common implementation code for utimes(), lutimes(), and futimes(). + */ +static int +getutimes(const struct timeval *usrtvp, enum uio_seg tvpseg, + struct timespec *tsp) +{ + struct timeval tv[2]; + const struct timeval *tvp; + int error; + + if (usrtvp == NULL) { + vfs_timestamp(&tsp[0]); + tsp[1] = tsp[0]; + } else { + if (tvpseg == UIO_SYSSPACE) { + tvp = usrtvp; + } else { + if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) + return (error); + tvp = tv; + } + + if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || + tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) + return (EINVAL); + TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); + TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); + } + return (0); +} + +/* + * Common implementation code for futimens(), utimensat(). + */ +#define UTIMENS_NULL 0x1 +#define UTIMENS_EXIT 0x2 +static int +getutimens(const struct timespec *usrtsp, enum uio_seg tspseg, + struct timespec *tsp, int *retflags) +{ + struct timespec tsnow; + int error; + + vfs_timestamp(&tsnow); + *retflags = 0; + if (usrtsp == NULL) { + tsp[0] = tsnow; + tsp[1] = tsnow; + *retflags |= UTIMENS_NULL; + return (0); + } + if (tspseg == UIO_SYSSPACE) { + tsp[0] = usrtsp[0]; + tsp[1] = usrtsp[1]; + } else if ((error = copyin(usrtsp, tsp, sizeof(*tsp) * 2)) != 0) + return (error); + if (tsp[0].tv_nsec == UTIME_OMIT && tsp[1].tv_nsec == UTIME_OMIT) + *retflags |= UTIMENS_EXIT; + if (tsp[0].tv_nsec == UTIME_NOW && tsp[1].tv_nsec == UTIME_NOW) + *retflags |= UTIMENS_NULL; + if (tsp[0].tv_nsec == UTIME_OMIT) + tsp[0].tv_sec = VNOVAL; + else if (tsp[0].tv_nsec == UTIME_NOW) + tsp[0] = tsnow; + else if (tsp[0].tv_nsec < 0 || tsp[0].tv_nsec >= 1000000000L) + return (EINVAL); + if (tsp[1].tv_nsec == UTIME_OMIT) + tsp[1].tv_sec = VNOVAL; + else if (tsp[1].tv_nsec == UTIME_NOW) + tsp[1] = tsnow; + else if (tsp[1].tv_nsec < 0 || tsp[1].tv_nsec >= 1000000000L) + return (EINVAL); + + return (0); +} + +/* + * Common implementation code for utimes(), lutimes(), futimes(), futimens(), + * and utimensat(). + */ +static int +setutimes(struct thread *td, struct vnode *vp, const struct timespec *ts, + int numtimes, int nullflag) +{ + struct mount *mp; + struct vattr vattr; + int error, setbirthtime; + + if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) + return (error); + vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); + setbirthtime = 0; + if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && + timespeccmp(&ts[1], &vattr.va_birthtime, < )) + setbirthtime = 1; + VATTR_NULL(&vattr); + vattr.va_atime = ts[0]; + vattr.va_mtime = ts[1]; + if (setbirthtime) + vattr.va_birthtime = ts[1]; + if (numtimes > 2) + vattr.va_birthtime = ts[2]; + if (nullflag) + vattr.va_vaflags |= VA_UTIMES_NULL; +#ifdef MAC + error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, + vattr.va_mtime); +#endif + if (error == 0) + error = VOP_SETATTR(vp, &vattr, td->td_ucred); + VOP_UNLOCK(vp, 0); + vn_finished_write(mp); + return (error); +} + +/* + * Set the access and modification times of a file. + */ +#ifndef _SYS_SYSPROTO_H_ +struct utimes_args { + char *path; + struct timeval *tptr; +}; +#endif +int +sys_utimes(struct thread *td, struct utimes_args *uap) +{ + + return (kern_utimesat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + uap->tptr, UIO_USERSPACE)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct futimesat_args { + int fd; + const char * path; + const struct timeval * times; +}; +#endif +int +sys_futimesat(struct thread *td, struct futimesat_args *uap) +{ + + return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, + uap->times, UIO_USERSPACE)); +} + +int +kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg, + struct timeval *tptr, enum uio_seg tptrseg) +{ + struct nameidata nd; + struct timespec ts[2]; + int error; + + if ((error = getutimes(tptr, tptrseg, ts)) != 0) + return (error); + NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, fd, + &cap_futimes_rights, td); + + if ((error = namei(&nd)) != 0) + return (error); + NDFREE(&nd, NDF_ONLY_PNBUF); + error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); + vrele(nd.ni_vp); + return (error); +} + +/* + * Set the access and modification times of a file. + */ +#ifndef _SYS_SYSPROTO_H_ +struct lutimes_args { + char *path; + struct timeval *tptr; +}; +#endif +int +sys_lutimes(struct thread *td, struct lutimes_args *uap) +{ + + return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, + UIO_USERSPACE)); +} + +int +kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg, + struct timeval *tptr, enum uio_seg tptrseg) +{ + struct timespec ts[2]; + struct nameidata nd; + int error; + + if ((error = getutimes(tptr, tptrseg, ts)) != 0) + return (error); + NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td); + if ((error = namei(&nd)) != 0) + return (error); + NDFREE(&nd, NDF_ONLY_PNBUF); + error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); + vrele(nd.ni_vp); + return (error); +} + +/* + * Set the access and modification times of a file. + */ +#ifndef _SYS_SYSPROTO_H_ +struct futimes_args { + int fd; + struct timeval *tptr; +}; +#endif +int +sys_futimes(struct thread *td, struct futimes_args *uap) +{ + + return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); +} + +int +kern_futimes(struct thread *td, int fd, struct timeval *tptr, + enum uio_seg tptrseg) +{ + struct timespec ts[2]; + struct file *fp; + int error; + + AUDIT_ARG_FD(fd); + error = getutimes(tptr, tptrseg, ts); + if (error != 0) + return (error); + error = getvnode(td, fd, &cap_futimes_rights, &fp); + if (error != 0) + return (error); +#ifdef AUDIT + vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); + AUDIT_ARG_VNODE1(fp->f_vnode); + VOP_UNLOCK(fp->f_vnode, 0); +#endif + error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); + fdrop(fp, td); + return (error); +} + +int +sys_futimens(struct thread *td, struct futimens_args *uap) +{ + + return (kern_futimens(td, uap->fd, uap->times, UIO_USERSPACE)); +} + +int +kern_futimens(struct thread *td, int fd, struct timespec *tptr, + enum uio_seg tptrseg) +{ + struct timespec ts[2]; + struct file *fp; + int error, flags; + + AUDIT_ARG_FD(fd); + error = getutimens(tptr, tptrseg, ts, &flags); + if (error != 0) + return (error); + if (flags & UTIMENS_EXIT) + return (0); + error = getvnode(td, fd, &cap_futimes_rights, &fp); + if (error != 0) + return (error); +#ifdef AUDIT + vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); + AUDIT_ARG_VNODE1(fp->f_vnode); + VOP_UNLOCK(fp->f_vnode, 0); +#endif + error = setutimes(td, fp->f_vnode, ts, 2, flags & UTIMENS_NULL); + fdrop(fp, td); + return (error); +} + +int +sys_utimensat(struct thread *td, struct utimensat_args *uap) +{ + + return (kern_utimensat(td, uap->fd, uap->path, UIO_USERSPACE, + uap->times, UIO_USERSPACE, uap->flag)); +} + +int +kern_utimensat(struct thread *td, int fd, char *path, enum uio_seg pathseg, + struct timespec *tptr, enum uio_seg tptrseg, int flag) +{ + struct nameidata nd; + struct timespec ts[2]; + int error, flags; + + if (flag & ~AT_SYMLINK_NOFOLLOW) + return (EINVAL); + + if ((error = getutimens(tptr, tptrseg, ts, &flags)) != 0) + return (error); + NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : + FOLLOW) | AUDITVNODE1, pathseg, path, fd, + &cap_futimes_rights, td); + if ((error = namei(&nd)) != 0) + return (error); + /* + * We are allowed to call namei() regardless of 2xUTIME_OMIT. + * POSIX states: + * "If both tv_nsec fields are UTIME_OMIT... EACCESS may be detected." + * "Search permission is denied by a component of the path prefix." + */ + NDFREE(&nd, NDF_ONLY_PNBUF); + if ((flags & UTIMENS_EXIT) == 0) + error = setutimes(td, nd.ni_vp, ts, 2, flags & UTIMENS_NULL); + vrele(nd.ni_vp); + return (error); +} + +/* + * Truncate a file given its path name. + */ +#ifndef _SYS_SYSPROTO_H_ +struct truncate_args { + char *path; + int pad; + off_t length; +}; +#endif +int +sys_truncate(struct thread *td, struct truncate_args *uap) +{ + + return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); +} + +int +kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length) +{ + struct mount *mp; + struct vnode *vp; + void *rl_cookie; + struct vattr vattr; + struct nameidata nd; + int error; + + if (length < 0) + return(EINVAL); + NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td); + if ((error = namei(&nd)) != 0) + return (error); + vp = nd.ni_vp; + rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX); + if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { + vn_rangelock_unlock(vp, rl_cookie); + vrele(vp); + return (error); + } + NDFREE(&nd, NDF_ONLY_PNBUF); + vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); + if (vp->v_type == VDIR) + error = EISDIR; +#ifdef MAC + else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { + } +#endif + else if ((error = vn_writechk(vp)) == 0 && + (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { + VATTR_NULL(&vattr); + vattr.va_size = length; + error = VOP_SETATTR(vp, &vattr, td->td_ucred); + } + VOP_UNLOCK(vp, 0); + vn_finished_write(mp); + vn_rangelock_unlock(vp, rl_cookie); + vrele(vp); + return (error); +} + +#if defined(COMPAT_43) +/* + * Truncate a file given its path name. + */ +#ifndef _SYS_SYSPROTO_H_ +struct otruncate_args { + char *path; + long length; +}; +#endif +int +otruncate(struct thread *td, struct otruncate_args *uap) +{ + + return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); +} +#endif /* COMPAT_43 */ + +#if defined(COMPAT_FREEBSD6) +/* Versions with the pad argument */ +int +freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) +{ + + return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); +} + +int +freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) +{ + + return (kern_ftruncate(td, uap->fd, uap->length)); +} +#endif + +int +kern_fsync(struct thread *td, int fd, bool fullsync) +{ + struct vnode *vp; + struct mount *mp; + struct file *fp; + int error, lock_flags; + + AUDIT_ARG_FD(fd); + error = getvnode(td, fd, &cap_fsync_rights, &fp); + if (error != 0) + return (error); + vp = fp->f_vnode; +#if 0 + if (!fullsync) + /* XXXKIB: compete outstanding aio writes */; +#endif + error = vn_start_write(vp, &mp, V_WAIT | PCATCH); + if (error != 0) + goto drop; + if (MNT_SHARED_WRITES(mp) || + ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { + lock_flags = LK_SHARED; + } else { + lock_flags = LK_EXCLUSIVE; + } + vn_lock(vp, lock_flags | LK_RETRY); + AUDIT_ARG_VNODE1(vp); + if (vp->v_object != NULL) { + VM_OBJECT_WLOCK(vp->v_object); + vm_object_page_clean(vp->v_object, 0, 0, 0); + VM_OBJECT_WUNLOCK(vp->v_object); + } + error = fullsync ? VOP_FSYNC(vp, MNT_WAIT, td) : VOP_FDATASYNC(vp, td); + VOP_UNLOCK(vp, 0); + vn_finished_write(mp); +drop: + fdrop(fp, td); + return (error); +} + +/* + * Sync an open file. + */ +#ifndef _SYS_SYSPROTO_H_ +struct fsync_args { + int fd; +}; +#endif +int +sys_fsync(struct thread *td, struct fsync_args *uap) +{ + + return (kern_fsync(td, uap->fd, true)); +} + +int +sys_fdatasync(struct thread *td, struct fdatasync_args *uap) +{ + + return (kern_fsync(td, uap->fd, false)); +} + +/* + * Rename files. Source and destination must either both be directories, or + * both not be directories. If target is a directory, it must be empty. + */ +#ifndef _SYS_SYSPROTO_H_ +struct rename_args { + char *from; + char *to; +}; +#endif +int +sys_rename(struct thread *td, struct rename_args *uap) +{ + + return (kern_renameat(td, AT_FDCWD, uap->from, AT_FDCWD, + uap->to, UIO_USERSPACE)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct renameat_args { + int oldfd; + char *old; + int newfd; + char *new; +}; +#endif +int +sys_renameat(struct thread *td, struct renameat_args *uap) +{ + + return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, + UIO_USERSPACE)); +} + +int +kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new, + enum uio_seg pathseg) +{ + struct mount *mp = NULL; + struct vnode *tvp, *fvp, *tdvp; + struct nameidata fromnd, tond; + int error; + +again: + bwillwrite(); +#ifdef MAC + NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | + AUDITVNODE1, pathseg, old, oldfd, + &cap_renameat_source_rights, td); +#else + NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART | AUDITVNODE1, + pathseg, old, oldfd, + &cap_renameat_source_rights, td); +#endif + + if ((error = namei(&fromnd)) != 0) + return (error); +#ifdef MAC + error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, + fromnd.ni_vp, &fromnd.ni_cnd); + VOP_UNLOCK(fromnd.ni_dvp, 0); + if (fromnd.ni_dvp != fromnd.ni_vp) + VOP_UNLOCK(fromnd.ni_vp, 0); +#endif + fvp = fromnd.ni_vp; + NDINIT_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | + SAVESTART | AUDITVNODE2, pathseg, new, newfd, + &cap_renameat_target_rights, td); + if (fromnd.ni_vp->v_type == VDIR) + tond.ni_cnd.cn_flags |= WILLBEDIR; + if ((error = namei(&tond)) != 0) { + /* Translate error code for rename("dir1", "dir2/."). */ + if (error == EISDIR && fvp->v_type == VDIR) + error = EINVAL; + NDFREE(&fromnd, NDF_ONLY_PNBUF); + vrele(fromnd.ni_dvp); + vrele(fvp); + goto out1; + } + tdvp = tond.ni_dvp; + tvp = tond.ni_vp; + error = vn_start_write(fvp, &mp, V_NOWAIT); + if (error != 0) { + NDFREE(&fromnd, NDF_ONLY_PNBUF); + NDFREE(&tond, NDF_ONLY_PNBUF); + if (tvp != NULL) + vput(tvp); + if (tdvp == tvp) + vrele(tdvp); + else + vput(tdvp); + vrele(fromnd.ni_dvp); + vrele(fvp); + vrele(tond.ni_startdir); + if (fromnd.ni_startdir != NULL) + vrele(fromnd.ni_startdir); + error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH); + if (error != 0) + return (error); + goto again; + } + if (tvp != NULL) { + if (fvp->v_type == VDIR && tvp->v_type != VDIR) { + error = ENOTDIR; + goto out; + } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { + error = EISDIR; + goto out; + } +#ifdef CAPABILITIES + if (newfd != AT_FDCWD && (tond.ni_resflags & NIRES_ABS) == 0) { + /* + * If the target already exists we require CAP_UNLINKAT + * from 'newfd', when newfd was used for the lookup. + */ + error = cap_check(&tond.ni_filecaps.fc_rights, + &cap_unlinkat_rights); + if (error != 0) + goto out; + } +#endif + } + if (fvp == tdvp) { + error = EINVAL; + goto out; + } + /* + * If the source is the same as the destination (that is, if they + * are links to the same vnode), then there is nothing to do. + */ + if (fvp == tvp) + error = -1; +#ifdef MAC + else + error = mac_vnode_check_rename_to(td->td_ucred, tdvp, + tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); +#endif +out: + if (error == 0) { + error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, + tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); + NDFREE(&fromnd, NDF_ONLY_PNBUF); + NDFREE(&tond, NDF_ONLY_PNBUF); + } else { + NDFREE(&fromnd, NDF_ONLY_PNBUF); + NDFREE(&tond, NDF_ONLY_PNBUF); + if (tvp != NULL) + vput(tvp); + if (tdvp == tvp) + vrele(tdvp); + else + vput(tdvp); + vrele(fromnd.ni_dvp); + vrele(fvp); + } + vrele(tond.ni_startdir); + vn_finished_write(mp); +out1: + if (fromnd.ni_startdir) + vrele(fromnd.ni_startdir); + if (error == -1) + return (0); + return (error); +} + +/* + * Make a directory file. + */ +#ifndef _SYS_SYSPROTO_H_ +struct mkdir_args { + char *path; + int mode; +}; +#endif +int +sys_mkdir(struct thread *td, struct mkdir_args *uap) +{ + + return (kern_mkdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE, + uap->mode)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct mkdirat_args { + int fd; + char *path; + mode_t mode; +}; +#endif +int +sys_mkdirat(struct thread *td, struct mkdirat_args *uap) +{ + + return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); +} + +int +kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg, + int mode) +{ + struct mount *mp; + struct vnode *vp; + struct vattr vattr; + struct nameidata nd; + int error; + + AUDIT_ARG_MODE(mode); +restart: + bwillwrite(); + NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME | AUDITVNODE1 | + NOCACHE, segflg, path, fd, &cap_mkdirat_rights, + td); + nd.ni_cnd.cn_flags |= WILLBEDIR; + if ((error = namei(&nd)) != 0) + return (error); + vp = nd.ni_vp; + if (vp != NULL) { + NDFREE(&nd, NDF_ONLY_PNBUF); + /* + * XXX namei called with LOCKPARENT but not LOCKLEAF has + * the strange behaviour of leaving the vnode unlocked + * if the target is the same vnode as the parent. + */ + if (vp == nd.ni_dvp) + vrele(nd.ni_dvp); + else + vput(nd.ni_dvp); + vrele(vp); + return (EEXIST); + } + if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) + return (error); + goto restart; + } + VATTR_NULL(&vattr); + vattr.va_type = VDIR; + vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; +#ifdef MAC + error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, + &vattr); + if (error != 0) + goto out; +#endif + error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); +#ifdef MAC +out: +#endif + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(nd.ni_dvp); + if (error == 0) + vput(nd.ni_vp); + vn_finished_write(mp); + return (error); +} + +/* + * Remove a directory file. + */ +#ifndef _SYS_SYSPROTO_H_ +struct rmdir_args { + char *path; +}; +#endif +int +sys_rmdir(struct thread *td, struct rmdir_args *uap) +{ + + return (kern_rmdirat(td, AT_FDCWD, uap->path, UIO_USERSPACE)); +} + +int +kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg) +{ + struct mount *mp; + struct vnode *vp; + struct nameidata nd; + int error; + +restart: + bwillwrite(); + NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF | AUDITVNODE1, + pathseg, path, fd, &cap_unlinkat_rights, td); + if ((error = namei(&nd)) != 0) + return (error); + vp = nd.ni_vp; + if (vp->v_type != VDIR) { + error = ENOTDIR; + goto out; + } + /* + * No rmdir "." please. + */ + if (nd.ni_dvp == vp) { + error = EINVAL; + goto out; + } + /* + * The root of a mounted filesystem cannot be deleted. + */ + if (vp->v_vflag & VV_ROOT) { + error = EBUSY; + goto out; + } +#ifdef MAC + error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, + &nd.ni_cnd); + if (error != 0) + goto out; +#endif + if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(vp); + if (nd.ni_dvp == vp) + vrele(nd.ni_dvp); + else + vput(nd.ni_dvp); + if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) + return (error); + goto restart; + } + vfs_notify_upper(vp, VFS_NOTIFY_UPPER_UNLINK); + error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); + vn_finished_write(mp); +out: + NDFREE(&nd, NDF_ONLY_PNBUF); + vput(vp); + if (nd.ni_dvp == vp) + vrele(nd.ni_dvp); + else + vput(nd.ni_dvp); + return (error); +} + +#if defined(COMPAT_43) || defined(COMPAT_FREEBSD11) +int +freebsd11_kern_getdirentries(struct thread *td, int fd, char *ubuf, u_int count, + long *basep, void (*func)(struct freebsd11_dirent *)) +{ + struct freebsd11_dirent dstdp; + struct dirent *dp, *edp; + char *dirbuf; + off_t base; + ssize_t resid, ucount; + int error; + + /* XXX arbitrary sanity limit on `count'. */ + count = min(count, 64 * 1024); + + dirbuf = malloc(count, M_TEMP, M_WAITOK); + + error = kern_getdirentries(td, fd, dirbuf, count, &base, &resid, + UIO_SYSSPACE); + if (error != 0) + goto done; + if (basep != NULL) + *basep = base; + + ucount = 0; + for (dp = (struct dirent *)dirbuf, + edp = (struct dirent *)&dirbuf[count - resid]; + ucount < count && dp < edp; ) { + if (dp->d_reclen == 0) + break; + MPASS(dp->d_reclen >= _GENERIC_DIRLEN(0)); + if (dp->d_namlen >= sizeof(dstdp.d_name)) + continue; + dstdp.d_type = dp->d_type; + dstdp.d_namlen = dp->d_namlen; + dstdp.d_fileno = dp->d_fileno; /* truncate */ + if (dstdp.d_fileno != dp->d_fileno) { + switch (ino64_trunc_error) { + default: + case 0: + break; + case 1: + error = EOVERFLOW; + goto done; + case 2: + dstdp.d_fileno = UINT32_MAX; + break; + } + } + dstdp.d_reclen = sizeof(dstdp) - sizeof(dstdp.d_name) + + ((dp->d_namlen + 1 + 3) &~ 3); + bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen); + bzero(dstdp.d_name + dstdp.d_namlen, + dstdp.d_reclen - offsetof(struct freebsd11_dirent, d_name) - + dstdp.d_namlen); + MPASS(dstdp.d_reclen <= dp->d_reclen); + MPASS(ucount + dstdp.d_reclen <= count); + if (func != NULL) + func(&dstdp); + error = copyout(&dstdp, ubuf + ucount, dstdp.d_reclen); + if (error != 0) + break; + dp = (struct dirent *)((char *)dp + dp->d_reclen); + ucount += dstdp.d_reclen; + } + +done: + free(dirbuf, M_TEMP); + if (error == 0) + td->td_retval[0] = ucount; + return (error); +} +#endif /* COMPAT */ + +#ifdef COMPAT_43 +static void +ogetdirentries_cvt(struct freebsd11_dirent *dp) +{ +#if (BYTE_ORDER == LITTLE_ENDIAN) + /* + * The expected low byte of dp->d_namlen is our dp->d_type. + * The high MBZ byte of dp->d_namlen is our dp->d_namlen. + */ + dp->d_type = dp->d_namlen; + dp->d_namlen = 0; +#else + /* + * The dp->d_type is the high byte of the expected dp->d_namlen, + * so must be zero'ed. + */ + dp->d_type = 0; +#endif +} + +/* + * Read a block of directory entries in a filesystem independent format. + */ +#ifndef _SYS_SYSPROTO_H_ +struct ogetdirentries_args { + int fd; + char *buf; + u_int count; + long *basep; +}; +#endif +int +ogetdirentries(struct thread *td, struct ogetdirentries_args *uap) +{ + long loff; + int error; + + error = kern_ogetdirentries(td, uap, &loff); + if (error == 0) + error = copyout(&loff, uap->basep, sizeof(long)); + return (error); +} + +int +kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap, + long *ploff) +{ + long base; + int error; + + /* XXX arbitrary sanity limit on `count'. */ + if (uap->count > 64 * 1024) + return (EINVAL); + + error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, + &base, ogetdirentries_cvt); + + if (error == 0 && uap->basep != NULL) + error = copyout(&base, uap->basep, sizeof(long)); + + return (error); +} +#endif /* COMPAT_43 */ + +#if defined(COMPAT_FREEBSD11) +#ifndef _SYS_SYSPROTO_H_ +struct freebsd11_getdirentries_args { + int fd; + char *buf; + u_int count; + long *basep; +}; +#endif +int +freebsd11_getdirentries(struct thread *td, + struct freebsd11_getdirentries_args *uap) +{ + long base; + int error; + + error = freebsd11_kern_getdirentries(td, uap->fd, uap->buf, uap->count, + &base, NULL); + + if (error == 0 && uap->basep != NULL) + error = copyout(&base, uap->basep, sizeof(long)); + return (error); +} + +int +freebsd11_getdents(struct thread *td, struct freebsd11_getdents_args *uap) +{ + struct freebsd11_getdirentries_args ap; + + ap.fd = uap->fd; + ap.buf = uap->buf; + ap.count = uap->count; + ap.basep = NULL; + return (freebsd11_getdirentries(td, &ap)); +} +#endif /* COMPAT_FREEBSD11 */ + +/* + * Read a block of directory entries in a filesystem independent format. + */ +int +sys_getdirentries(struct thread *td, struct getdirentries_args *uap) +{ + off_t base; + int error; + + error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base, + NULL, UIO_USERSPACE); + if (error != 0) + return (error); + if (uap->basep != NULL) + error = copyout(&base, uap->basep, sizeof(off_t)); + return (error); +} + +int +kern_getdirentries(struct thread *td, int fd, char *buf, size_t count, + off_t *basep, ssize_t *residp, enum uio_seg bufseg) +{ + struct vnode *vp; + struct file *fp; + struct uio auio; + struct iovec aiov; + off_t loff; + int error, eofflag; + off_t foffset; + + AUDIT_ARG_FD(fd); + if (count > IOSIZE_MAX) + return (EINVAL); + auio.uio_resid = count; + error = getvnode(td, fd, &cap_read_rights, &fp); + if (error != 0) + return (error); + if ((fp->f_flag & FREAD) == 0) { + fdrop(fp, td); + return (EBADF); + } + vp = fp->f_vnode; + foffset = foffset_lock(fp, 0); +unionread: + if (vp->v_type != VDIR) { + error = EINVAL; + goto fail; + } + aiov.iov_base = buf; + aiov.iov_len = count; + auio.uio_iov = &aiov; + auio.uio_iovcnt = 1; + auio.uio_rw = UIO_READ; + auio.uio_segflg = bufseg; + auio.uio_td = td; + vn_lock(vp, LK_SHARED | LK_RETRY); + AUDIT_ARG_VNODE1(vp); + loff = auio.uio_offset = foffset; +#ifdef MAC + error = mac_vnode_check_readdir(td->td_ucred, vp); + if (error == 0) +#endif + error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, + NULL); + foffset = auio.uio_offset; + if (error != 0) { + VOP_UNLOCK(vp, 0); + goto fail; + } + if (count == auio.uio_resid && + (vp->v_vflag & VV_ROOT) && + (vp->v_mount->mnt_flag & MNT_UNION)) { + struct vnode *tvp = vp; + + vp = vp->v_mount->mnt_vnodecovered; + VREF(vp); + fp->f_vnode = vp; + fp->f_data = vp; + foffset = 0; + vput(tvp); + goto unionread; + } + VOP_UNLOCK(vp, 0); + *basep = loff; + if (residp != NULL) + *residp = auio.uio_resid; + td->td_retval[0] = count - auio.uio_resid; +fail: + foffset_unlock(fp, foffset, 0); + fdrop(fp, td); + return (error); +} + +/* + * Set the mode mask for creation of filesystem nodes. + */ +#ifndef _SYS_SYSPROTO_H_ +struct umask_args { + int newmask; +}; +#endif +int +sys_umask(struct thread *td, struct umask_args *uap) +{ + struct filedesc *fdp; + + fdp = td->td_proc->p_fd; + FILEDESC_XLOCK(fdp); + td->td_retval[0] = fdp->fd_cmask; + fdp->fd_cmask = uap->newmask & ALLPERMS; + FILEDESC_XUNLOCK(fdp); + return (0); +} + +/* + * Void all references to file by ripping underlying filesystem away from + * vnode. + */ +#ifndef _SYS_SYSPROTO_H_ +struct revoke_args { + char *path; +}; +#endif +int +sys_revoke(struct thread *td, struct revoke_args *uap) +{ + struct vnode *vp; + struct vattr vattr; + struct nameidata nd; + int error; + + NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_USERSPACE, + uap->path, td); + if ((error = namei(&nd)) != 0) + return (error); + vp = nd.ni_vp; + NDFREE(&nd, NDF_ONLY_PNBUF); + if (vp->v_type != VCHR || vp->v_rdev == NULL) { + error = EINVAL; + goto out; + } +#ifdef MAC + error = mac_vnode_check_revoke(td->td_ucred, vp); + if (error != 0) + goto out; +#endif + error = VOP_GETATTR(vp, &vattr, td->td_ucred); + if (error != 0) + goto out; + if (td->td_ucred->cr_uid != vattr.va_uid) { + error = priv_check(td, PRIV_VFS_ADMIN); + if (error != 0) + goto out; + } + if (vcount(vp) > 1) + VOP_REVOKE(vp, REVOKEALL); +out: + vput(vp); + return (error); +} + +/* + * Convert a user file descriptor to a kernel file entry and check that, if it + * is a capability, the correct rights are present. A reference on the file + * entry is held upon returning. + */ +int +getvnode(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp) +{ + struct file *fp; + int error; + + error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL); + if (error != 0) + return (error); + + /* + * The file could be not of the vnode type, or it may be not + * yet fully initialized, in which case the f_vnode pointer + * may be set, but f_ops is still badfileops. E.g., + * devfs_open() transiently create such situation to + * facilitate csw d_fdopen(). + * + * Dupfdopen() handling in kern_openat() installs the + * half-baked file into the process descriptor table, allowing + * other thread to dereference it. Guard against the race by + * checking f_ops. + */ + if (fp->f_vnode == NULL || fp->f_ops == &badfileops) { + fdrop(fp, td); + return (EINVAL); + } + *fpp = fp; + return (0); +} + + +/* + * Get an (NFS) file handle. + */ +#ifndef _SYS_SYSPROTO_H_ +struct lgetfh_args { + char *fname; + fhandle_t *fhp; +}; +#endif +int +sys_lgetfh(struct thread *td, struct lgetfh_args *uap) +{ + + return (kern_getfhat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, uap->fname, + UIO_USERSPACE, uap->fhp)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct getfh_args { + char *fname; + fhandle_t *fhp; +}; +#endif +int +sys_getfh(struct thread *td, struct getfh_args *uap) +{ + + return (kern_getfhat(td, 0, AT_FDCWD, uap->fname, UIO_USERSPACE, + uap->fhp)); +} + +/* + * syscall for the rpc.lockd to use to translate an open descriptor into + * a NFS file handle. + * + * warning: do not remove the priv_check() call or this becomes one giant + * security hole. + */ +#ifndef _SYS_SYSPROTO_H_ +struct getfhat_args { + int fd; + char *path; + fhandle_t *fhp; + int flags; +}; +#endif +int +sys_getfhat(struct thread *td, struct getfhat_args *uap) +{ + + if ((uap->flags & ~(AT_SYMLINK_NOFOLLOW)) != 0) + return (EINVAL); + return (kern_getfhat(td, uap->flags, uap->fd, uap->path, UIO_USERSPACE, + uap->fhp)); +} + +static int +kern_getfhat(struct thread *td, int flags, int fd, const char *path, + enum uio_seg pathseg, fhandle_t *fhp) +{ + struct nameidata nd; + fhandle_t fh; + struct vnode *vp; + int error; + + error = priv_check(td, PRIV_VFS_GETFH); + if (error != 0) + return (error); + NDINIT_AT(&nd, LOOKUP, ((flags & AT_SYMLINK_NOFOLLOW) != 0 ? NOFOLLOW : + FOLLOW) | /*((flags & AT_BENEATH) != 0 ? BENEATH : 0) |*/ LOCKLEAF | + AUDITVNODE1, pathseg, path, fd, td); + error = namei(&nd); + if (error != 0) + return (error); + NDFREE(&nd, NDF_ONLY_PNBUF); + vp = nd.ni_vp; + bzero(&fh, sizeof(fh)); + fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; + error = VOP_VPTOFH(vp, &fh.fh_fid); + vput(vp); + if (error == 0) + error = copyout(&fh, fhp, sizeof (fh)); + return (error); +} + +#ifndef _SYS_SYSPROTO_H_ +struct fhlink_args { + fhandle_t *fhp; + const char *to; +}; +#endif +int +sys_fhlink(struct thread *td, struct fhlink_args *uap) +{ + + return (kern_fhlinkat(td, AT_FDCWD, uap->to, UIO_USERSPACE, uap->fhp)); +} + +#ifndef _SYS_SYSPROTO_H_ +struct fhlinkat_args { + fhandle_t *fhp; + int tofd; + const char *to; +}; +#endif +int +sys_fhlinkat(struct thread *td, struct fhlinkat_args *uap) +{ + + return (kern_fhlinkat(td, uap->tofd, uap->to, UIO_USERSPACE, uap->fhp)); +} + +static int +kern_fhlinkat(struct thread *td, int fd, const char *path, + enum uio_seg pathseg, fhandle_t *fhp) +{ + fhandle_t fh; + struct mount *mp; + struct vnode *vp; + int error; + + error = priv_check(td, PRIV_VFS_GETFH); + if (error != 0) + return (error); + error = copyin(fhp, &fh, sizeof(fh)); + if (error != 0) + return (error); + do { + bwillwrite(); + if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) + return (ESTALE); + error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); + vfs_unbusy(mp); + if (error != 0) + return (error); + VOP_UNLOCK(vp, 0); + } while ((error = kern_linkat_vp(td, vp, fd, path, pathseg)) == EAGAIN); + return (error); +} + +#ifndef _SYS_SYSPROTO_H_ +struct fhreadlink_args { + fhandle_t *fhp; + char *buf; + size_t bufsize; +}; +#endif +int +sys_fhreadlink(struct thread *td, struct fhreadlink_args *uap) +{ + fhandle_t fh; + struct mount *mp; + struct vnode *vp; + int error; + + error = priv_check(td, PRIV_VFS_GETFH); + if (error != 0) + return (error); + if (uap->bufsize > IOSIZE_MAX) + return (EINVAL); + error = copyin(uap->fhp, &fh, sizeof(fh)); + if (error != 0) + return (error); + if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) + return (ESTALE); + error = VFS_FHTOVP(mp, &fh.fh_fid, LK_SHARED, &vp); + vfs_unbusy(mp); + if (error != 0) + return (error); + error = kern_readlink_vp(vp, uap->buf, UIO_USERSPACE, uap->bufsize, td); + vput(vp); + return (error); +} + +/* + * syscall for the rpc.lockd to use to translate a NFS file handle into an + * open descriptor. + * + * warning: do not remove the priv_check() call or this becomes one giant + * security hole. + */ +#ifndef _SYS_SYSPROTO_H_ +struct fhopen_args { + const struct fhandle *u_fhp; + int flags; +}; +#endif +int +sys_fhopen(struct thread *td, struct fhopen_args *uap) +{ + struct mount *mp; + struct vnode *vp; + struct fhandle fhp; + struct file *fp; + int fmode, error; + int indx; + + error = priv_check(td, PRIV_VFS_FHOPEN); + if (error != 0) + return (error); + indx = -1; + fmode = FFLAGS(uap->flags); + /* why not allow a non-read/write open for our lockd? */ + if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) + return (EINVAL); + error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); + if (error != 0) + return(error); + /* find the mount point */ + mp = vfs_busyfs(&fhp.fh_fsid); + if (mp == NULL) + return (ESTALE); + /* now give me my vnode, it gets returned to me locked */ + error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp); + vfs_unbusy(mp); + if (error != 0) + return (error); + + error = falloc_noinstall(td, &fp); + if (error != 0) { + vput(vp); + return (error); + } + /* + * An extra reference on `fp' has been held for us by + * falloc_noinstall(). + */ + +#ifdef INVARIANTS + td->td_dupfd = -1; +#endif + error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp); + if (error != 0) { + KASSERT(fp->f_ops == &badfileops, + ("VOP_OPEN in fhopen() set f_ops")); + KASSERT(td->td_dupfd < 0, + ("fhopen() encountered fdopen()")); + + vput(vp); + goto bad; + } +#ifdef INVARIANTS + td->td_dupfd = 0; +#endif + fp->f_vnode = vp; + fp->f_seqcount = 1; + finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp, + &vnops); + VOP_UNLOCK(vp, 0); + if ((fmode & O_TRUNC) != 0) { + error = fo_truncate(fp, 0, td->td_ucred, td); + if (error != 0) + goto bad; + } + + error = finstall(td, fp, &indx, fmode, NULL); +bad: + fdrop(fp, td); + td->td_retval[0] = indx; + return (error); +} + +/* + * Stat an (NFS) file handle. + */ +#ifndef _SYS_SYSPROTO_H_ +struct fhstat_args { + struct fhandle *u_fhp; + struct stat *sb; +}; +#endif +int +sys_fhstat(struct thread *td, struct fhstat_args *uap) +{ + struct stat sb; + struct fhandle fh; + int error; + + error = copyin(uap->u_fhp, &fh, sizeof(fh)); + if (error != 0) + return (error); + error = kern_fhstat(td, fh, &sb); + if (error == 0) + error = copyout(&sb, uap->sb, sizeof(sb)); + return (error); +} + +int +kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb) +{ + struct mount *mp; + struct vnode *vp; + int error; + + error = priv_check(td, PRIV_VFS_FHSTAT); + if (error != 0) + return (error); + if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) + return (ESTALE); + error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); + vfs_unbusy(mp); + if (error != 0) + return (error); + error = vn_stat(vp, sb, td->td_ucred, NOCRED, td); + vput(vp); + return (error); +} + +/* + * Implement fstatfs() for (NFS) file handles. + */ +#ifndef _SYS_SYSPROTO_H_ +struct fhstatfs_args { + struct fhandle *u_fhp; + struct statfs *buf; +}; +#endif +int +sys_fhstatfs(struct thread *td, struct fhstatfs_args *uap) +{ + struct statfs *sfp; + fhandle_t fh; + int error; + + error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); + if (error != 0) + return (error); + sfp = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK); + error = kern_fhstatfs(td, fh, sfp); + if (error == 0) + error = copyout(sfp, uap->buf, sizeof(*sfp)); + free(sfp, M_STATFS); + return (error); +} + +int +kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) +{ + struct statfs *sp; + struct mount *mp; + struct vnode *vp; + int error; + + error = priv_check(td, PRIV_VFS_FHSTATFS); + if (error != 0) + return (error); + if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) + return (ESTALE); + error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp); + if (error != 0) { + vfs_unbusy(mp); + return (error); + } + vput(vp); + error = prison_canseemount(td->td_ucred, mp); + if (error != 0) + goto out; +#ifdef MAC + error = mac_mount_check_stat(td->td_ucred, mp); + if (error != 0) + goto out; +#endif + /* + * Set these in case the underlying filesystem fails to do so. + */ + sp = &mp->mnt_stat; + sp->f_version = STATFS_VERSION; + sp->f_namemax = NAME_MAX; + sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; + error = VFS_STATFS(mp, sp); + if (error == 0) + *buf = *sp; +out: + vfs_unbusy(mp); + return (error); +} + +int +kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len) +{ + struct file *fp; + struct mount *mp; + struct vnode *vp; + off_t olen, ooffset; + int error; +#ifdef AUDIT + int audited_vnode1 = 0; +#endif + + AUDIT_ARG_FD(fd); + if (offset < 0 || len <= 0) + return (EINVAL); + /* Check for wrap. */ + if (offset > OFF_MAX - len) + return (EFBIG); + AUDIT_ARG_FD(fd); + error = fget(td, fd, &cap_pwrite_rights, &fp); + if (error != 0) + return (error); + AUDIT_ARG_FILE(td->td_proc, fp); + if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { + error = ESPIPE; + goto out; + } + if ((fp->f_flag & FWRITE) == 0) { + error = EBADF; + goto out; + } + if (fp->f_type != DTYPE_VNODE) { + error = ENODEV; + goto out; + } + vp = fp->f_vnode; + if (vp->v_type != VREG) { + error = ENODEV; + goto out; + } + + /* Allocating blocks may take a long time, so iterate. */ + for (;;) { + olen = len; + ooffset = offset; + + bwillwrite(); + mp = NULL; + error = vn_start_write(vp, &mp, V_WAIT | PCATCH); + if (error != 0) + break; + error = vn_lock(vp, LK_EXCLUSIVE); + if (error != 0) { + vn_finished_write(mp); + break; + } +#ifdef AUDIT + if (!audited_vnode1) { + AUDIT_ARG_VNODE1(vp); + audited_vnode1 = 1; + } +#endif +#ifdef MAC + error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp); + if (error == 0) +#endif + error = VOP_ALLOCATE(vp, &offset, &len); + VOP_UNLOCK(vp, 0); + vn_finished_write(mp); + + if (olen + ooffset != offset + len) { + panic("offset + len changed from %jx/%jx to %jx/%jx", + ooffset, olen, offset, len); + } + if (error != 0 || len == 0) + break; + KASSERT(olen > len, ("Iteration did not make progress?")); + maybe_yield(); + } + out: + fdrop(fp, td); + return (error); +} + +int +sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap) +{ + int error; + + error = kern_posix_fallocate(td, uap->fd, uap->offset, uap->len); + return (kern_posix_error(td, error)); +} + +/* + * Unlike madvise(2), we do not make a best effort to remember every + * possible caching hint. Instead, we remember the last setting with + * the exception that we will allow POSIX_FADV_NORMAL to adjust the + * region of any current setting. + */ +int +kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len, + int advice) +{ + struct fadvise_info *fa, *new; + struct file *fp; + struct vnode *vp; + off_t end; + int error; + + if (offset < 0 || len < 0 || offset > OFF_MAX - len) + return (EINVAL); + AUDIT_ARG_VALUE(advice); + switch (advice) { + case POSIX_FADV_SEQUENTIAL: + case POSIX_FADV_RANDOM: + case POSIX_FADV_NOREUSE: + new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK); + break; + case POSIX_FADV_NORMAL: + case POSIX_FADV_WILLNEED: + case POSIX_FADV_DONTNEED: + new = NULL; + break; + default: + return (EINVAL); + } + /* XXX: CAP_POSIX_FADVISE? */ + AUDIT_ARG_FD(fd); + error = fget(td, fd, &cap_no_rights, &fp); + if (error != 0) + goto out; + AUDIT_ARG_FILE(td->td_proc, fp); + if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) { + error = ESPIPE; + goto out; + } + if (fp->f_type != DTYPE_VNODE) { + error = ENODEV; + goto out; + } + vp = fp->f_vnode; + if (vp->v_type != VREG) { + error = ENODEV; + goto out; + } + if (len == 0) + end = OFF_MAX; + else + end = offset + len - 1; + switch (advice) { + case POSIX_FADV_SEQUENTIAL: + case POSIX_FADV_RANDOM: + case POSIX_FADV_NOREUSE: + /* + * Try to merge any existing non-standard region with + * this new region if possible, otherwise create a new + * non-standard region for this request. + */ + mtx_pool_lock(mtxpool_sleep, fp); + fa = fp->f_advice; + if (fa != NULL && fa->fa_advice == advice && + ((fa->fa_start <= end && fa->fa_end >= offset) || + (end != OFF_MAX && fa->fa_start == end + 1) || + (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) { + if (offset < fa->fa_start) + fa->fa_start = offset; + if (end > fa->fa_end) + fa->fa_end = end; + } else { + new->fa_advice = advice; + new->fa_start = offset; + new->fa_end = end; + fp->f_advice = new; + new = fa; + } + mtx_pool_unlock(mtxpool_sleep, fp); + break; + case POSIX_FADV_NORMAL: + /* + * If a the "normal" region overlaps with an existing + * non-standard region, trim or remove the + * non-standard region. + */ + mtx_pool_lock(mtxpool_sleep, fp); + fa = fp->f_advice; + if (fa != NULL) { + if (offset <= fa->fa_start && end >= fa->fa_end) { + new = fa; + fp->f_advice = NULL; + } else if (offset <= fa->fa_start && + end >= fa->fa_start) + fa->fa_start = end + 1; + else if (offset <= fa->fa_end && end >= fa->fa_end) + fa->fa_end = offset - 1; + else if (offset >= fa->fa_start && end <= fa->fa_end) { + /* + * If the "normal" region is a middle + * portion of the existing + * non-standard region, just remove + * the whole thing rather than picking + * one side or the other to + * preserve. + */ + new = fa; + fp->f_advice = NULL; + } + } + mtx_pool_unlock(mtxpool_sleep, fp); + break; + case POSIX_FADV_WILLNEED: + case POSIX_FADV_DONTNEED: + error = VOP_ADVISE(vp, offset, end, advice); + break; + } +out: + if (fp != NULL) + fdrop(fp, td); + free(new, M_FADVISE); + return (error); +} + +int +sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap) +{ + int error; + + error = kern_posix_fadvise(td, uap->fd, uap->offset, uap->len, + uap->advice); + return (kern_posix_error(td, error)); +} |