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linux/security
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Sachin Grover 9808c97d3c selinux: KASAN: slab-out-of-bounds in xattr_getsecurity 
commit efe3de79e0 upstream.

Call trace:
 [<ffffff9203a8d7a8>] dump_backtrace+0x0/0x428
 [<ffffff9203a8dbf8>] show_stack+0x28/0x38
 [<ffffff920409bfb8>] dump_stack+0xd4/0x124
 [<ffffff9203d187e8>] print_address_description+0x68/0x258
 [<ffffff9203d18c00>] kasan_report.part.2+0x228/0x2f0
 [<ffffff9203d1927c>] kasan_report+0x5c/0x70
 [<ffffff9203d1776c>] check_memory_region+0x12c/0x1c0
 [<ffffff9203d17cdc>] memcpy+0x34/0x68
 [<ffffff9203d75348>] xattr_getsecurity+0xe0/0x160
 [<ffffff9203d75490>] vfs_getxattr+0xc8/0x120
 [<ffffff9203d75d68>] getxattr+0x100/0x2c8
 [<ffffff9203d76fb4>] SyS_fgetxattr+0x64/0xa0
 [<ffffff9203a83f70>] el0_svc_naked+0x24/0x28

If user get root access and calls security.selinux setxattr() with an
embedded NUL on a file and then if some process performs a getxattr()
on that file with a length greater than the actual length of the string,
it would result in a panic.

To fix this, add the actual length of the string to the security context
instead of the length passed by the userspace process.

Signed-off-by: Sachin Grover <sgrover@codeaurora.org>
Cc: stable@vger.kernel.org
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-06-05 11:41:56 +02:00
..
apparmor apparmor: fix resource audit messages when auditing peer 2018-04-19 08:56:18 +02:00
integrity ima: Fallback to the builtin hash algorithm 2018-05-30 07:52:29 +02:00
keys KEYS: reject NULL restriction string when type is specified 2017-12-14 09:52:53 +01:00
loadpin security: mark LSM hooks as __ro_after_init 2017-03-06 11:00:15 +11:00
selinux selinux: KASAN: slab-out-of-bounds in xattr_getsecurity 2018-06-05 11:41:56 +02:00
smack lsm: fix smack_inode_removexattr and xattr_getsecurity memleak 2017-10-04 18:03:15 +11:00
tomoyo License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
yama doc: ReSTify Yama.txt 2017-05-18 10:33:04 -06:00
commoncap.c commoncap: Handle memory allocation failure. 2018-04-29 11:33:16 +02:00
device_cgroup.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
inode.c securityfs: add the ability to support symlinks 2017-06-08 12:51:43 -07:00
Kconfig /dev/mem: Add bounce buffer for copy-out 2018-03-24 11:01:24 +01:00
lsm_audit.c lsm_audit: update my email address 2017-08-17 15:33:39 -04:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
min_addr.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
security.c selinux/stable-4.14 PR 20170831 2017-09-12 13:21:00 -07:00