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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295// SPDX-License-Identifier: GPL-2.0#include <linux/file.h>#include <linux/mount.h>#include <linux/namei.h>#include <linux/utime.h>#include <linux/syscalls.h>#include <linux/uaccess.h>#include <linux/compat.h>#include <asm/unistd.h>#include <linux/filelock.h>#include "internal.h"
static bool nsec_valid(long nsec){ if (nsec == UTIME_OMIT || nsec == UTIME_NOW) return true;
return nsec >= 0 && nsec <= 999999999;}
int vfs_utimes(const struct path *path, struct timespec64 *times){ int error; struct iattr newattrs; struct inode *inode = path->dentry->d_inode; struct delegated_inode delegated_inode = { };
if (times) { if (!nsec_valid(times[0].tv_nsec) || !nsec_valid(times[1].tv_nsec)) return -EINVAL; if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) times = NULL; }
error = mnt_want_write(path->mnt); if (error) goto out;
newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME; if (times) { if (times[0].tv_nsec == UTIME_OMIT) newattrs.ia_valid &= ~ATTR_ATIME; else if (times[0].tv_nsec != UTIME_NOW) { newattrs.ia_atime = times[0]; newattrs.ia_valid |= ATTR_ATIME_SET; }
if (times[1].tv_nsec == UTIME_OMIT) newattrs.ia_valid &= ~ATTR_MTIME; else if (times[1].tv_nsec != UTIME_NOW) { newattrs.ia_mtime = times[1]; newattrs.ia_valid |= ATTR_MTIME_SET; } /* * Tell setattr_prepare(), that this is an explicit time * update, even if neither ATTR_ATIME_SET nor ATTR_MTIME_SET * were used. */ newattrs.ia_valid |= ATTR_TIMES_SET; } else { newattrs.ia_valid |= ATTR_TOUCH; }retry_deleg: inode_lock(inode); error = notify_change(mnt_idmap(path->mnt), path->dentry, &newattrs, &delegated_inode); inode_unlock(inode); if (is_delegated(&delegated_inode)) { error = break_deleg_wait(&delegated_inode); if (!error) goto retry_deleg; }
mnt_drop_write(path->mnt);out: return error;}EXPORT_SYMBOL_GPL(vfs_utimes);
static int do_utimes_path(int dfd, const char __user *filename, struct timespec64 *times, int flags){ struct path path; int lookup_flags = 0, error;
if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) return -EINVAL;
if (!(flags & AT_SYMLINK_NOFOLLOW)) lookup_flags |= LOOKUP_FOLLOW;
CLASS(filename_uflags, name)(filename, flags);retry: error = filename_lookup(dfd, name, lookup_flags, &path, NULL); if (error) return error; error = vfs_utimes(&path, times); path_put(&path); if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; } return error;}
static int do_utimes_fd(int fd, struct timespec64 *times, int flags){ if (flags) return -EINVAL;
CLASS(fd, f)(fd); if (fd_empty(f)) return -EBADF; return vfs_utimes(&fd_file(f)->f_path, times);}
/* * do_utimes - change times on filename or file descriptor * @dfd: open file descriptor, -1 or AT_FDCWD * @filename: path name or NULL * @times: new times or NULL * @flags: zero or more flags (only AT_SYMLINK_NOFOLLOW for the moment) * * If filename is NULL and dfd refers to an open file, then operate on * the file. Otherwise look up filename, possibly using dfd as a * starting point. * * If times==NULL, set access and modification to current time, * must be owner or have write permission. * Else, update from *times, must be owner or super user. */long do_utimes(int dfd, const char __user *filename, struct timespec64 *times, int flags){ if (filename == NULL && dfd != AT_FDCWD) return do_utimes_fd(dfd, times, flags); return do_utimes_path(dfd, filename, times, flags);}
SYSCALL_DEFINE4(utimensat, int, dfd, const char __user *, filename, struct __kernel_timespec __user *, utimes, int, flags){ struct timespec64 tstimes[2];
if (utimes) { if ((get_timespec64(&tstimes[0], &utimes[0]) || get_timespec64(&tstimes[1], &utimes[1]))) return -EFAULT;
/* Nothing to do, we must not even check the path. */ if (tstimes[0].tv_nsec == UTIME_OMIT && tstimes[1].tv_nsec == UTIME_OMIT) return 0; }
return do_utimes(dfd, filename, utimes ? tstimes : NULL, flags);}
#ifdef __ARCH_WANT_SYS_UTIME/* * futimesat(), utimes() and utime() are older versions of utimensat() * that are provided for compatibility with traditional C libraries. * On modern architectures, we always use libc wrappers around * utimensat() instead. */static long do_futimesat(int dfd, const char __user *filename, struct __kernel_old_timeval __user *utimes){ struct __kernel_old_timeval times[2]; struct timespec64 tstimes[2];
if (utimes) { if (copy_from_user(×, utimes, sizeof(times))) return -EFAULT;
/* This test is needed to catch all invalid values. If we would test only in do_utimes we would miss those invalid values truncated by the multiplication with 1000. Note that we also catch UTIME_{NOW,OMIT} here which are only valid for utimensat. */ if (times[0].tv_usec >= 1000000 || times[0].tv_usec < 0 || times[1].tv_usec >= 1000000 || times[1].tv_usec < 0) return -EINVAL;
tstimes[0].tv_sec = times[0].tv_sec; tstimes[0].tv_nsec = 1000 * times[0].tv_usec; tstimes[1].tv_sec = times[1].tv_sec; tstimes[1].tv_nsec = 1000 * times[1].tv_usec; }
return do_utimes(dfd, filename, utimes ? tstimes : NULL, 0);}
SYSCALL_DEFINE3(futimesat, int, dfd, const char __user *, filename, struct __kernel_old_timeval __user *, utimes){ return do_futimesat(dfd, filename, utimes);}
SYSCALL_DEFINE2(utimes, char __user *, filename, struct __kernel_old_timeval __user *, utimes){ return do_futimesat(AT_FDCWD, filename, utimes);}
SYSCALL_DEFINE2(utime, char __user *, filename, struct utimbuf __user *, times){ struct timespec64 tv[2];
if (times) { if (get_user(tv[0].tv_sec, ×->actime) || get_user(tv[1].tv_sec, ×->modtime)) return -EFAULT; tv[0].tv_nsec = 0; tv[1].tv_nsec = 0; } return do_utimes(AT_FDCWD, filename, times ? tv : NULL, 0);}#endif
#ifdef CONFIG_COMPAT_32BIT_TIME/* * Not all architectures have sys_utime, so implement this in terms * of sys_utimes. */#ifdef __ARCH_WANT_SYS_UTIME32SYSCALL_DEFINE2(utime32, const char __user *, filename, struct old_utimbuf32 __user *, t){ struct timespec64 tv[2];
if (t) { if (get_user(tv[0].tv_sec, &t->actime) || get_user(tv[1].tv_sec, &t->modtime)) return -EFAULT; tv[0].tv_nsec = 0; tv[1].tv_nsec = 0; } return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);}#endif
SYSCALL_DEFINE4(utimensat_time32, unsigned int, dfd, const char __user *, filename, struct old_timespec32 __user *, t, int, flags){ struct timespec64 tv[2];
if (t) { if (get_old_timespec32(&tv[0], &t[0]) || get_old_timespec32(&tv[1], &t[1])) return -EFAULT;
if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT) return 0; } return do_utimes(dfd, filename, t ? tv : NULL, flags);}
#ifdef __ARCH_WANT_SYS_UTIME32static long do_compat_futimesat(unsigned int dfd, const char __user *filename, struct old_timeval32 __user *t){ struct timespec64 tv[2];
if (t) { if (get_user(tv[0].tv_sec, &t[0].tv_sec) || get_user(tv[0].tv_nsec, &t[0].tv_usec) || get_user(tv[1].tv_sec, &t[1].tv_sec) || get_user(tv[1].tv_nsec, &t[1].tv_usec)) return -EFAULT; if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 || tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0) return -EINVAL; tv[0].tv_nsec *= 1000; tv[1].tv_nsec *= 1000; } return do_utimes(dfd, filename, t ? tv : NULL, 0);}
SYSCALL_DEFINE3(futimesat_time32, unsigned int, dfd, const char __user *, filename, struct old_timeval32 __user *, t){ return do_compat_futimesat(dfd, filename, t);}
SYSCALL_DEFINE2(utimes_time32, const char __user *, filename, struct old_timeval32 __user *, t){ return do_compat_futimesat(AT_FDCWD, filename, t);}#endif#endif