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main: tv_sec -> tv_nsec

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As specified in utimensat(2), *tv_nsec*, not *tv_sec*, should be set to
UTIME_NOW or UTIME_OMIT.

The way this bug manifests is that if utimensat() is called with
one of the timestamps set to UTIME_OMIT, fuse-overlayfs will
accidentally reset the timestamp to 1073741822, which is 2004-01-10
13:37:02 UTC.
This commit is contained in:
cptpcrd 2021-04-13 20:52:11 -04:00
parent 6457fd46c0
commit d23dbe914d
1 changed files with 5 additions and 5 deletions
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10
main.c
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@ -3947,19 +3947,19 @@ ovl_setattr (fuse_req_t req, fuse_ino_t ino, struct stat *attr, int to_set, stru
l = release_big_lock (); l = release_big_lock ();
memset (times, 0, sizeof (times)); memset (times, 0, sizeof (times));
times[0].tv_sec = UTIME_OMIT; times[0].tv_nsec = UTIME_OMIT;
times[1].tv_sec = UTIME_OMIT; times[1].tv_nsec = UTIME_OMIT;
if (to_set & FUSE_SET_ATTR_ATIME) if (to_set & FUSE_SET_ATTR_ATIME)
times[0] = attr->st_atim; times[0] = attr->st_atim;
else if (to_set & FUSE_SET_ATTR_ATIME_NOW) else if (to_set & FUSE_SET_ATTR_ATIME_NOW)
times[0].tv_sec = UTIME_NOW; times[0].tv_nsec = UTIME_NOW;
if (to_set & FUSE_SET_ATTR_MTIME) if (to_set & FUSE_SET_ATTR_MTIME)
times[1] = attr->st_mtim; times[1] = attr->st_mtim;
else if (to_set & FUSE_SET_ATTR_MTIME_NOW) else if (to_set & FUSE_SET_ATTR_MTIME_NOW)
times[1].tv_sec = UTIME_NOW; times[1].tv_nsec = UTIME_NOW;
if (times[0].tv_sec != UTIME_OMIT || times[1].tv_sec != UTIME_OMIT) if (times[0].tv_nsec != UTIME_OMIT || times[1].tv_nsec != UTIME_OMIT)
{ {
if (fd >= 0) if (fd >= 0)
ret = futimens (fd, times); ret = futimens (fd, times);