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linux-next/security/selinux
Vasily Averin 8d269a8e2a selinux: sel_avc_get_stat_idx should increase position index
If seq_file .next function does not change position index,
read after some lseek can generate unexpected output.

$ dd if=/sys/fs/selinux/avc/cache_stats # usual output
lookups hits misses allocations reclaims frees
817223 810034 7189 7189 6992 7037
1934894 1926896 7998 7998 7632 7683
1322812 1317176 5636 5636 5456 5507
1560571 1551548 9023 9023 9056 9115
0+1 records in
0+1 records out
189 bytes copied, 5,1564e-05 s, 3,7 MB/s

$# read after lseek to midle of last line
$ dd if=/sys/fs/selinux/avc/cache_stats bs=180 skip=1
dd: /sys/fs/selinux/avc/cache_stats: cannot skip to specified offset
056 9115   <<<< end of last line
1560571 1551548 9023 9023 9056 9115  <<< whole last line once again
0+1 records in
0+1 records out
45 bytes copied, 8,7221e-05 s, 516 kB/s

$# read after lseek beyond  end of of file
$ dd if=/sys/fs/selinux/avc/cache_stats bs=1000 skip=1
dd: /sys/fs/selinux/avc/cache_stats: cannot skip to specified offset
1560571 1551548 9023 9023 9056 9115  <<<< generates whole last line
0+1 records in
0+1 records out
36 bytes copied, 9,0934e-05 s, 396 kB/s

https://bugzilla.kernel.org/show_bug.cgi?id=206283

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
2020-02-10 10:49:01 -05:00
..
include selinux: allow kernfs symlinks to inherit parent directory context 2020-02-10 10:49:01 -05:00
ss selinux: allow kernfs symlinks to inherit parent directory context 2020-02-10 10:49:01 -05:00
.gitignore SELinux: add .gitignore files for dynamic classes 2009-10-24 09:42:27 +08:00
avc.c selinux: ensure we cleanup the internal AVC counters on error in avc_update() 2019-12-21 10:59:21 -05:00
hooks.c selinux: allow kernfs symlinks to inherit parent directory context 2020-02-10 10:49:01 -05:00
ibpkey.c selinux: clean up selinux_enabled/disabled/enforcing_boot 2019-12-18 21:22:46 -05:00
Kconfig Documentation,selinux: deprecate setting checkreqprot to 1 2020-02-10 10:49:01 -05:00
Makefile selinux: move status variables out of selinux_ss 2020-02-10 10:49:01 -05:00
netif.c selinux: clean up selinux_enabled/disabled/enforcing_boot 2019-12-18 21:22:46 -05:00
netlabel.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
netlink.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
netnode.c selinux: clean up selinux_enabled/disabled/enforcing_boot 2019-12-18 21:22:46 -05:00
netport.c selinux: clean up selinux_enabled/disabled/enforcing_boot 2019-12-18 21:22:46 -05:00
nlmsgtab.c net: bridge: vlan: add rtm definitions and dump support 2020-01-15 13:48:17 +01:00
selinuxfs.c selinux: sel_avc_get_stat_idx should increase position index 2020-02-10 10:49:01 -05:00
status.c selinux: move status variables out of selinux_ss 2020-02-10 10:49:01 -05:00
xfrm.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00