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| author | Michael Kerrisk <mtk.manpages@googlemail.com> | 2008-06-10 06:16:07 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2008-06-23 14:43:03 +0200 |
| commit | 12fd0d3088d27867be68655bcab2b074f2835f60 (patch) | |
| tree | 088cf4d5ffc4f4f094b443f1186250403d296132 /fs | |
| parent | [PATCH] fix cgroup-inflicted breakage in block_dev.c (diff) | |
| download | linux-12fd0d3088d27867be68655bcab2b074f2835f60.tar.xz linux-12fd0d3088d27867be68655bcab2b074f2835f60.zip | |
[patch for 2.6.26 2/4] vfs: utimensat(): be consistent with utime() for immutable and append-only files
This patch fixes utimensat() to make its behavior consistent
with that of utime()/utimes() when dealing with files marked
immutable and append-only.
The current utimensat() implementation also returns EPERM if
'times' is non-NULL and the tv_nsec fields are both UTIME_NOW.
For consistency, the
(times != NULL && times[0].tv_nsec == UTIME_NOW &&
times[1].tv_nsec == UTIME_NOW)
case should be treated like the traditional utimes() case where
'times' is NULL. That is, the call should succeed for a file
marked append-only and should give the error EACCES if the file
is marked as immutable.
The simple way to do this is to set 'times' to NULL
if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW).
This is also the natural approach, since POSIX.1 semantics consider the
times == {{x, UTIME_NOW}, {y, UTIME_NOW}}
to be exactly equivalent to the case for
times == NULL.
(Thanks to Miklos for pointing this out.)
Patch 3 in this series relies on the simplification provided
by this patch.
Acked-by: Miklos Szeredi <miklos@szeredi.hu>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/utimes.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/utimes.c b/fs/utimes.c index af059d5cb485..14d3edbb3d7c 100644 --- a/fs/utimes.c +++ b/fs/utimes.c @@ -102,6 +102,10 @@ long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags if (error) goto dput_and_out; + if (times && times[0].tv_nsec == UTIME_NOW && + times[1].tv_nsec == UTIME_NOW) + times = NULL; + /* Don't worry, the checks are done in inode_change_ok() */ newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME; if (times) { |