On Thu, Jun 6, 2019 at 3:52 PM syzbot <syzbot+9a901acbc447313bfe3e@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 156c0591 Merge tag 'linux-kselftest-5.2-rc4' of git://git... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=13512d51a00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=60564cb52ab29d5b > dashboard link: https://syzkaller.appspot.com/bug?extid=9a901acbc447313bfe3e > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11a4b01ea00000 Looks +bpf related from the repro. > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+9a901acbc447313bfe3e@xxxxxxxxxxxxxxxxxxxxxxxxx > > ================================================================== > BUG: KASAN: slab-out-of-bounds in vsnprintf+0x1727/0x19a0 > lib/vsprintf.c:2503 > Read of size 8 at addr ffff8880a91c7d00 by task syz-executor.0/9821 > > CPU: 0 PID: 9821 Comm: syz-executor.0 Not tainted 5.2.0-rc3+ #13 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > > Allocated by task 1024: > (stack is not available) > > Freed by task 2310999008: > ------------[ cut here ]------------ > Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected > to SLAB object 'skbuff_head_cache' (offset 24, size 1)! > WARNING: CPU: 0 PID: 9821 at mm/usercopy.c:78 usercopy_warn+0xeb/0x110 > mm/usercopy.c:78 > Kernel panic - not syncing: panic_on_warn set ... > Shutting down cpus with NMI > Kernel Offset: disabled > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0000000000004945f1058aa80556%40google.com. > For more options, visit https://groups.google.com/d/optout.
