On Mon, Dec 2, 2019 at 7:35 AM syzbot <syzbot+5320383e16029ba057ff@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: b94ae8ad Merge tag 'seccomp-v5.5-rc1' of git://git.kernel... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=10f9ffcee00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ff560c3de405258c > dashboard link: https://syzkaller.appspot.com/bug?extid=5320383e16029ba057ff > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12dd682ae00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16290abce00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+5320383e16029ba057ff@xxxxxxxxxxxxxxxxxxxxxxxxx I think this relates to fs/io_uring.c rather than kernel/cred.c. +io_uring maintainers > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] PREEMPT SMP KASAN > CPU: 0 PID: 9217 Comm: io_uring-sq Not tainted 5.4.0-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:creds_are_invalid kernel/cred.c:792 [inline] > RIP: 0010:__validate_creds include/linux/cred.h:187 [inline] > RIP: 0010:override_creds+0x9f/0x170 kernel/cred.c:550 > Code: ac 25 00 81 fb 64 65 73 43 0f 85 a3 37 00 00 e8 17 ab 25 00 49 8d 7c > 24 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 > c0 74 08 3c 03 0f 8e 96 00 00 00 41 8b 5c 24 10 bf > RSP: 0018:ffff88809c45fda0 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: 0000000043736564 RCX: ffffffff814f3318 > RDX: 0000000000000002 RSI: ffffffff814f3329 RDI: 0000000000000010 > RBP: ffff88809c45fdb8 R08: ffff8880a3aac240 R09: ffffed1014755849 > R10: ffffed1014755848 R11: ffff8880a3aac247 R12: 0000000000000000 > R13: ffff888098ab1600 R14: 0000000000000000 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffd51c40664 CR3: 0000000092641000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > io_sq_thread+0x1c7/0xa20 fs/io_uring.c:3274 > kthread+0x361/0x430 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > Modules linked in: > ---[ end trace f2e1a4307fbe2245 ]--- > RIP: 0010:creds_are_invalid kernel/cred.c:792 [inline] > RIP: 0010:__validate_creds include/linux/cred.h:187 [inline] > RIP: 0010:override_creds+0x9f/0x170 kernel/cred.c:550 > Code: ac 25 00 81 fb 64 65 73 43 0f 85 a3 37 00 00 e8 17 ab 25 00 49 8d 7c > 24 10 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 > c0 74 08 3c 03 0f 8e 96 00 00 00 41 8b 5c 24 10 bf > RSP: 0018:ffff88809c45fda0 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: 0000000043736564 RCX: ffffffff814f3318 > RDX: 0000000000000002 RSI: ffffffff814f3329 RDI: 0000000000000010 > RBP: ffff88809c45fdb8 R08: ffff8880a3aac240 R09: ffffed1014755849 > R10: ffffed1014755848 R11: ffff8880a3aac247 R12: 0000000000000000 > R13: ffff888098ab1600 R14: 0000000000000000 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffd51c40664 CR3: 0000000092641000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > --- > 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/000000000000da160a0598b2c704%40google.com.
