Messages in this thread | | | From | Dmitry Vyukov <> | Date | Sun, 10 Jun 2018 13:52:35 +0200 | Subject | Re: WARNING: kmalloc bug in xdp_umem_create |
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On Sun, Jun 10, 2018 at 11:31 AM, Björn Töpel <bjorn.topel@gmail.com> wrote: > Den sön 10 juni 2018 kl 04:53 skrev Tetsuo Handa > <penguin-kernel@i-love.sakura.ne.jp>: >> >> On 2018/06/10 7:47, syzbot wrote: >> > Hello, >> > >> > syzbot found the following crash on: >> > >> > HEAD commit: 7d3bf613e99a Merge tag 'libnvdimm-for-4.18' of git://git.k.. >> > git tree: upstream >> > console output: https://syzkaller.appspot.com/x/log.txt?x=1073f68f800000 >> > kernel config: https://syzkaller.appspot.com/x/.config?x=f04d8d0a2afb789a >> > dashboard link: https://syzkaller.appspot.com/bug?extid=4abadc5d69117b346506 >> > compiler: gcc (GCC) 8.0.1 20180413 (experimental) >> > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=13c9756f800000 >> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16366f9f800000 >> > >> > IMPORTANT: if you fix the bug, please add the following tag to the commit: >> > Reported-by: syzbot+4abadc5d69117b346506@syzkaller.appspotmail.com >> > >> > random: sshd: uninitialized urandom read (32 bytes read) >> > random: sshd: uninitialized urandom read (32 bytes read) >> > random: sshd: uninitialized urandom read (32 bytes read) >> > random: sshd: uninitialized urandom read (32 bytes read) >> > random: sshd: uninitialized urandom read (32 bytes read) >> > WARNING: CPU: 1 PID: 4537 at mm/slab_common.c:996 kmalloc_slab+0x56/0x70 mm/slab_common.c:996 >> > Kernel panic - not syncing: panic_on_warn set ... >> >> syzbot gave up upon kmalloc(), but actually error handling path has >> NULL pointer dereference bug. >> > > Thanks Tetsuo! This crash has been fixed by Daniel Borkmann in commit > c09290c56376 ("bpf, xdp: fix crash in xdp_umem_unaccount_pages").
Let's tell syzbot about this:
#syz fix: bpf, xdp: fix crash in xdp_umem_unaccount_pages
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