AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

lz4: fix LZ4_decompress_safe_partial read out of bound

Browse Source 
commit eafc0a02391b7b36617b36c97c4b5d6832cf5e24 upstream.

When partialDecoding, it is EOF if we've either filled the output buffer
or can't proceed with reading an offset for following match.

In some extreme corner cases when compressed data is suitably corrupted,
UAF will occur.  As reported by KASAN [1], LZ4_decompress_safe_partial
may lead to read out of bound problem during decoding.  lz4 upstream has
fixed it [2] and this issue has been disscussed here [3] before.

current decompression routine was ported from lz4 v1.8.3, bumping
lib/lz4 to v1.9.+ is certainly a huge work to be done later, so, we'd
better fix it first.

[1] https://lore.kernel.org/all/000000000000830d1205cf7f0477@google.com/
[2] c5d6f8a8be#
[3] https://lore.kernel.org/all/CC666AE8-4CA4-4951-B6FB-A2EFDE3AC03B@fb.com/

Link: https://lkml.kernel.org/r/20211111105048.2006070-1-guoxuenan@huawei.com
Reported-by: syzbot+63d688f1d899c588fb71@syzkaller.appspotmail.com
Signed-off-by: Guo Xuenan <guoxuenan@huawei.com>
Reviewed-by: Nick Terrell <terrelln@fb.com>
Acked-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Cc: Yann Collet <cyan@fb.com>
Cc: Chengyang Fan <cy.fan@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guo Xuenan 2022-04-08 13:08:58 -07:00 committed by Greg Kroah-Hartman
parent 8b6f04b4c9
commit 6adc01a7aa
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
lib/lz4/lz4_decompress.c
View File

@ -271,8 +271,12 @@ static FORCE_INLINE int LZ4_decompress_generic(
ip += length; ip += length;
op += length; op += length;
/* Necessarily EOF, due to parsing restrictions */ /* Necessarily EOF when !partialDecoding.
if (!partialDecoding || (cpy == oend)) * When partialDecoding, it is EOF if we've either
* filled the output buffer or
* can't proceed with reading an offset for following match.
*/
if (!partialDecoding || (cpy == oend) || (ip >= (iend - 2)))
break; break;
} else { } else {
/* may overwrite up to WILDCOPYLENGTH beyond cpy */ /* may overwrite up to WILDCOPYLENGTH beyond cpy */