On 27/10/2021 17:28, Michael S. Tsirkin wrote:
On Wed, Oct 27, 2021 at 03:36:19PM +0200, Dmitry Vyukov wrote:
On Wed, 27 Oct 2021 at 15:11, Laurent Vivier <lvivier@xxxxxxxxxx> wrote:
On 26/10/2021 18:39, syzbot wrote:
Hello,
syzbot found the following issue on:
HEAD commit: 9ae1fbdeabd3 Add linux-next specific files for 20211025
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1331363cb00000
kernel config: https://syzkaller.appspot.com/x/.config?x=aeb17e42bc109064
dashboard link: https://syzkaller.appspot.com/bug?extid=b86736b5935e0d25b446
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=116ce954b00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132fcf62b00000
The issue was bisected to:
commit 22849b5ea5952d853547cc5e0651f34a246b2a4f
Author: Leon Romanovsky <leonro@xxxxxxxxxx>
Date: Thu Oct 21 14:16:14 2021 +0000
devlink: Remove not-executed trap policer notifications
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=137d8bfcb00000
final oops: https://syzkaller.appspot.com/x/report.txt?x=10fd8bfcb00000
console output: https://syzkaller.appspot.com/x/log.txt?x=177d8bfcb00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b86736b5935e0d25b446@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 22849b5ea595 ("devlink: Remove not-executed trap policer notifications")
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/fortify-string.h:225 [inline]
BUG: KASAN: slab-out-of-bounds in copy_data+0xf3/0x2e0 drivers/char/hw_random/virtio-rng.c:68
Read of size 64 at addr ffff88801a7a1580 by task syz-executor989/6542
I'm not able to reproduce the problem with next-20211026 and the C reproducer.
And reviewing the code in copy_data() I don't see any issue.
Is it possible to know what it the VM configuration used to test it?
Hi Laurent,
syzbot used e2-standard-2 GCE VM when that happened.
You can see some info about these VMs under the "VM info" link on the dashboard.
Could you pls confirm whether reverting
caaf2874ba27b92bca6f0298bf88bad94067ec37 addresses this?
I've restarted the syzbot on top of "hwrng: virtio - don't wait on cleanup" [1] and the
problem has not been triggered.
See https://syzkaller.appspot.com/bug?extid=b86736b5935e0d25b446
Thanks,
Laurent
[1]
d721abbeb145 hwrng: virtio - don't wait on cleanup
bb768beb0a5f hwrng: virtio - add an internal buffer
d25f27432f80 (origin/master, origin/HEAD, master) Merge tag 'arm-soc-fixes-5.15-3' of
git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
