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a4dad1ae24
linux/fs/ext4
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David Turner a4dad1ae24 ext4: Fix handling of extended tv_sec 
In ext4, the bottom two bits of {a,c,m}time_extra are used to extend
the {a,c,m}time fields, deferring the year 2038 problem to the year
2446.

When decoding these extended fields, for times whose bottom 32 bits
would represent a negative number, sign extension causes the 64-bit
extended timestamp to be negative as well, which is not what's
intended.  This patch corrects that issue, so that the only negative
{a,c,m}times are those between 1901 and 1970 (as per 32-bit signed
timestamps).

Some older kernels might have written pre-1970 dates with 1,1 in the
extra bits.  This patch treats those incorrectly-encoded dates as
pre-1970, instead of post-2311, until kernel 4.20 is released.
Hopefully by then e2fsck will have fixed up the bad data.

Also add a comment explaining the encoding of ext4's extra {a,c,m}time
bits.

Signed-off-by: David Turner <novalis@novalis.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: Mark Harris <mh8928@yahoo.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=23732
Cc: stable@vger.kernel.org
2015-11-24 14:34:37 -05:00
..
acl.c ext4: remove unused header files 2015-04-02 23:47:42 -04:00
acl.h ext2/3/4: use generic posix ACL infrastructure 2014-01-25 23:58:19 -05:00
balloc.c ext4: make the bitmap read routines return real error codes 2015-10-17 21:33:24 -04:00
bitmap.c ext4: remove unused header files 2015-04-02 23:47:42 -04:00
block_validity.c ext4: call out CRC and corruption errors with specific error codes 2015-10-17 16:16:04 -04:00
crypto_fname.c ext4 crypto: replace some BUG_ON()'s with error checks 2015-10-03 10:49:27 -04:00
crypto_key.c ext4 crypto: replace some BUG_ON()'s with error checks 2015-10-03 10:49:27 -04:00
crypto_policy.c ext4 crypto: replace some BUG_ON()'s with error checks 2015-10-03 10:49:27 -04:00
crypto.c ext4 crypto: fix bugs in ext4_encrypted_zeroout() 2015-10-03 10:49:29 -04:00
dir.c ext4: clean up feature test macros with predicate functions 2015-10-17 16:18:43 -04:00
ext4_crypto.h ext4 crypto: allocate bounce pages using GFP_NOWAIT 2015-06-03 09:32:39 -04:00
ext4_extents.h ext4: teach ext4_ext_find_extent() to realloc path if necessary 2014-09-01 14:40:09 -04:00
ext4_jbd2.c ext4: fix potential use after free in __ext4_journal_stop 2015-10-17 22:57:06 -04:00
ext4_jbd2.h ext4: clean up feature test macros with predicate functions 2015-10-17 16:18:43 -04:00
ext4.h ext4: Fix handling of extended tv_sec 2015-11-24 14:34:37 -05:00
extents_status.c ext4: move procfs registration code to fs/ext4/sysfs.c 2015-09-23 12:46:17 -04:00
extents_status.h ext4: move procfs registration code to fs/ext4/sysfs.c 2015-09-23 12:46:17 -04:00
extents.c ext4: clean up feature test macros with predicate functions 2015-10-17 16:18:43 -04:00
file.c ext4: start transaction before calling into DAX 2015-09-08 15:35:28 -07:00
fsync.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-26 17:22:07 -07:00
hash.c ext4: remove unused header files 2015-04-02 23:47:42 -04:00
ialloc.c ext4: make the bitmap read routines return real error codes 2015-10-17 21:33:24 -04:00
indirect.c ext4: clean up feature test macros with predicate functions 2015-10-17 16:18:43 -04:00
inline.c ext4: clean up feature test macros with predicate functions 2015-10-17 16:18:43 -04:00
inode.c ext4: clean up feature test macros with predicate functions 2015-10-17 16:18:43 -04:00
ioctl.c ext4: clean up feature test macros with predicate functions 2015-10-17 16:18:43 -04:00
Kconfig ext4: Improve ext4 Kconfig test 2015-07-23 20:59:40 +02:00
Makefile ext4: move sysfs code from super.c to fs/ext4/sysfs.c 2015-09-23 12:44:17 -04:00
mballoc.c ext4: fix abs() usage in ext4_mb_check_group_pa 2015-10-19 00:01:05 -04:00
mballoc.h ext4: remove unused ac_ex_scanned 2014-02-20 13:32:10 -05:00
migrate.c ext4: clean up feature test macros with predicate functions 2015-10-17 16:18:43 -04:00
mmp.c ext4: call out CRC and corruption errors with specific error codes 2015-10-17 16:16:04 -04:00
move_extent.c ext4: make online defrag error reporting consistent 2015-06-21 21:38:03 -04:00
namei.c fs/ext4: remove unnecessary new_valid_dev check 2015-10-29 14:18:13 -04:00
page-io.c ext4 crypto: fix memory leak in ext4_bio_write_page() 2015-10-02 23:54:58 -04:00
readpage.c ext4 crypto: ext4_page_crypto() doesn't need a encryption context 2015-10-03 10:49:26 -04:00
resize.c [PATCH] fix calculation of meta_bg descriptor backups 2015-10-18 00:36:29 -04:00
super.c ext4: do not allow journal_opts for fs w/o journal 2015-10-18 23:50:26 -04:00
symlink.c ext4: call out CRC and corruption errors with specific error codes 2015-10-17 16:16:04 -04:00
sysfs.c ext4: store checksum seed in superblock 2015-10-17 16:16:02 -04:00
truncate.h ext4: move common truncate functions to header file 2011-06-27 19:16:04 -04:00
xattr_security.c VFS: normal filesystems (and lustre): d_inode() annotations 2015-04-15 15:06:57 -04:00
xattr_trusted.c VFS: normal filesystems (and lustre): d_inode() annotations 2015-04-15 15:06:57 -04:00
xattr_user.c VFS: normal filesystems (and lustre): d_inode() annotations 2015-04-15 15:06:57 -04:00
xattr.c ext4: clean up feature test macros with predicate functions 2015-10-17 16:18:43 -04:00
xattr.h ext4 crypto: add encryption xattr support 2015-04-11 07:47:00 -04:00