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SubjectRe: KASAN: slab-out-of-bounds Read in cap_convert_nscap
On Tue, Jan 02, 2018 at 01:58:01AM -0800, syzbot wrote:
> Hello,
>
> syzkaller hit the following crash on
> 5aa90a84589282b87666f92b6c3c917c8080a9bf
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
> C reproducer is attached
> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> for information about syzkaller reproducers
>
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+7bf52949a1cf3a36b620@syzkaller.appspotmail.com
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.
>
> audit: type=1400 audit(1514639069.283:7): avc: denied { map } for
> pid=3182 comm="syzkaller986771" path="/root/syzkaller986771207" dev="sda1"
> ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
> tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
> ==================================================================
> BUG: KASAN: slab-out-of-bounds in cap_convert_nscap+0x501/0x610
> security/commoncap.c:498
> Read of size 4 at addr ffff8801c96ae080 by task syzkaller986771/3182
>
> CPU: 1 PID: 3182 Comm: syzkaller986771 Not tainted 4.15.0-rc5+ #152
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:17 [inline]
> dump_stack+0x194/0x257 lib/dump_stack.c:53
> print_address_description+0x73/0x250 mm/kasan/report.c:252
> kasan_report_error mm/kasan/report.c:351 [inline]
> kasan_report+0x25b/0x340 mm/kasan/report.c:409
> __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
> cap_convert_nscap+0x501/0x610 security/commoncap.c:498
> setxattr+0x365/0x400 fs/xattr.c:446
> SYSC_fsetxattr fs/xattr.c:508 [inline]
> SyS_fsetxattr+0x130/0x190 fs/xattr.c:497
> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
> entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:129

Looks like the same bug I sent out a fix for yesterday.

#syz fix: capabilities: fix buffer overread on very short xattr

https://marc.info/?l=linux-kernel&m=151488700301705

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