linux-stable/fs/isofs/util.c
Linus Torvalds f14fc0ccee Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
Pull quota, ext2, isofs and udf fixes from Jan Kara:

 - two small quota error handling fixes

 - two isofs fixes for architectures with signed char

 - several udf block number overflow and signedness fixes

 - ext2 rework of mount option handling to avoid GFP_KERNEL allocation
   with spinlock held

 - ... it also contains a patch to implement auditing of responses to
   fanotify permission events. That should have been in the fanotify
   pull request but I mistakenly merged that patch into a wrong branch
   and noticed only now at which point I don't think it's worth rebasing
   and redoing.

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  quota: be aware of error from dquot_initialize
  quota: fix potential infinite loop
  isofs: use unsigned char types consistently
  isofs: fix timestamps beyond 2027
  udf: Fix some sign-conversion warnings
  udf: Fix signed/unsigned format specifiers
  udf: Fix 64-bit sign extension issues affecting blocks > 0x7FFFFFFF
  udf: Remove some outdate references from documentation
  udf: Avoid overflow when session starts at large offset
  ext2: Fix possible sleep in atomic during mount option parsing
  ext2: Parse mount options into a dedicated structure
  audit: Record fanotify access control decisions
2017-11-14 14:13:11 -08:00

71 lines
2.2 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/isofs/util.c
*/
#include <linux/time.h>
#include "isofs.h"
/*
* We have to convert from a MM/DD/YY format to the Unix ctime format.
* We have to take into account leap years and all of that good stuff.
* Unfortunately, the kernel does not have the information on hand to
* take into account daylight savings time, but it shouldn't matter.
* The time stored should be localtime (with or without DST in effect),
* and the timezone offset should hold the offset required to get back
* to GMT. Thus we should always be correct.
*/
int iso_date(u8 *p, int flag)
{
int year, month, day, hour, minute, second, tz;
int crtime;
year = p[0];
month = p[1];
day = p[2];
hour = p[3];
minute = p[4];
second = p[5];
if (flag == 0) tz = p[6]; /* High sierra has no time zone */
else tz = 0;
if (year < 0) {
crtime = 0;
} else {
crtime = mktime64(year+1900, month, day, hour, minute, second);
/* sign extend */
if (tz & 0x80)
tz |= (-1 << 8);
/*
* The timezone offset is unreliable on some disks,
* so we make a sanity check. In no case is it ever
* more than 13 hours from GMT, which is 52*15min.
* The time is always stored in localtime with the
* timezone offset being what get added to GMT to
* get to localtime. Thus we need to subtract the offset
* to get to true GMT, which is what we store the time
* as internally. On the local system, the user may set
* their timezone any way they wish, of course, so GMT
* gets converted back to localtime on the receiving
* system.
*
* NOTE: mkisofs in versions prior to mkisofs-1.10 had
* the sign wrong on the timezone offset. This has now
* been corrected there too, but if you are getting screwy
* results this may be the explanation. If enough people
* complain, a user configuration option could be added
* to add the timezone offset in with the wrong sign
* for 'compatibility' with older discs, but I cannot see how
* it will matter that much.
*
* Thanks to kuhlmav@elec.canterbury.ac.nz (Volker Kuhlmann)
* for pointing out the sign error.
*/
if (-52 <= tz && tz <= 52)
crtime -= tz * 15 * 60;
}
return crtime;
}