Hello,
syzbot found the following issue on:
HEAD commit: a68a0262 mm/madvise: remove racy mm ownership check
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=165b9413500000
kernel config: https://syzkaller.appspot.com/x/.config?x=4305fa9ea70c7a9f
dashboard link: https://syzkaller.appspot.com/bug?extid=cfa88ddd0655afa88763
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1180a237500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=114067cf500000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.50' (ECDSA) to the list of known hosts.
executing program
executing program
BUG: memory leak
unreferenced object 0xffff88810f897940 (size 64):
comm "syz-executor991", pid 8502, jiffies 4294942194 (age 14.080s)
hex dump (first 32 bytes):
7f 00 00 00 80 00 00 00 00 00 00 00 00 00 00 00 ................
00 a0 37 0c 81 88 ff ff 00 00 00 00 00 00 00 00 ..7.............
backtrace:
[<00000000639d0dd1>] xskq_create+0x23/0xd0 include/linux/slab.h:552
[<00000000b680b035>] xsk_init_queue net/xdp/xsk.c:508 [inline]
[<00000000b680b035>] xsk_setsockopt+0x1c4/0x590 net/xdp/xsk.c:875
[<000000002b302260>] __sys_setsockopt+0x1b0/0x360 net/socket.c:2132
[<00000000ae03723e>] __do_sys_setsockopt net/socket.c:2143 [inline]
[<00000000ae03723e>] __se_sys_setsockopt net/socket.c:2140 [inline]
[<00000000ae03723e>] __x64_sys_setsockopt+0x22/0x30 net/socket.c:2140
[<0000000005c2b4a0>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<0000000003db140f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: memory leak
unreferenced object 0xffff88810f8979c0 (size 64):
comm "syz-executor991", pid 8503, jiffies 4294942194 (age 14.080s)
hex dump (first 32 bytes):
ff 03 00 00 00 04 00 00 00 00 00 00 00 00 00 00 ................
00 00 13 12 81 88 ff ff 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000639d0dd1>] xskq_create+0x23/0xd0 include/linux/slab.h:552
[<00000000b680b035>] xsk_init_queue net/xdp/xsk.c:508 [inline]
[<00000000b680b035>] xsk_setsockopt+0x1c4/0x590 net/xdp/xsk.c:875
[<000000002b302260>] __sys_setsockopt+0x1b0/0x360 net/socket.c:2132
[<00000000ae03723e>] __do_sys_setsockopt net/socket.c:2143 [inline]
[<00000000ae03723e>] __se_sys_setsockopt net/socket.c:2140 [inline]
[<00000000ae03723e>] __x64_sys_setsockopt+0x22/0x30 net/socket.c:2140
[<0000000005c2b4a0>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<0000000003db140f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
---
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On 2020-12-16 19:11, Peilin Ye wrote:
> Hi all,
>
> On Sun, Dec 13, 2020 at 06:53:10AM -0800, syzbot wrote:
>> BUG: memory leak
>> unreferenced object 0xffff88810f897940 (size 64):
>> comm "syz-executor991", pid 8502, jiffies 4294942194 (age 14.080s)
>> hex dump (first 32 bytes):
>> 7f 00 00 00 80 00 00 00 00 00 00 00 00 00 00 00 ................
>> 00 a0 37 0c 81 88 ff ff 00 00 00 00 00 00 00 00 ..7.............
>> backtrace:
>> [<00000000639d0dd1>] xskq_create+0x23/0xd0 include/linux/slab.h:552
>> [<00000000b680b035>] xsk_init_queue net/xdp/xsk.c:508 [inline]
>> [<00000000b680b035>] xsk_setsockopt+0x1c4/0x590 net/xdp/xsk.c:875
>> [<000000002b302260>] __sys_setsockopt+0x1b0/0x360 net/socket.c:2132
>> [<00000000ae03723e>] __do_sys_setsockopt net/socket.c:2143 [inline]
>> [<00000000ae03723e>] __se_sys_setsockopt net/socket.c:2140 [inline]
>> [<00000000ae03723e>] __x64_sys_setsockopt+0x22/0x30 net/socket.c:2140
>> [<0000000005c2b4a0>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
>> [<0000000003db140f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> I have tested the following diff locally against syzbot's reproducer,
> and sent a patch to it [1] for testing. I will send a real patch here
> tomorrow if syzbot is happy about it. Please see explanation below.
>
Hi Peilin Ye!
Thanks for taking a look! Magnus has already addressed this problem in
another patch [1].
Cheers,
Björn
[1]
https://lore.kernel.org/bpf/[email protected]/
Hi Bj?rn,
On Thu, Dec 17, 2020 at 08:12:26AM +0100, Bj?rn T?pel wrote:
> On 2020-12-16 19:11, Peilin Ye wrote:
> > I have tested the following diff locally against syzbot's reproducer,
> > and sent a patch to it [1] for testing. I will send a real patch here
> > tomorrow if syzbot is happy about it. Please see explanation below.
>
> Hi Peilin Ye!
>
> Thanks for taking a look! Magnus has already addressed this problem in
> another patch [1].
No problem! Oops, I searched for "cfa88ddd0655afa88763" on LKML and
didn't notice Magnus's patch. I should have searched netdev too.
Thanks,
Peilin Ye