On Wed, Jul 18, 2018 at 8:39 AM, syzbot <syzbot+af1504df0807a083dbd9@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 1dcbe5f2c615 Add linux-next specific files for 20180717 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=12158f70400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ea5926dddb0db97a > dashboard link: https://syzkaller.appspot.com/bug?extid=af1504df0807a083dbd9 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=177631c2400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13722bb2400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+af1504df0807a083dbd9@xxxxxxxxxxxxxxxxxxxxxxxxx Looks like 9p is not checking some data received from network. +9p maintainers. > 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: 0 PID: 4458 at mm/slab_common.c:1031 kmalloc_slab+0x56/0x70 > mm/slab_common.c:1031 > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 0 PID: 4458 Comm: syz-executor537 Not tainted 4.18.0-rc5-next-20180717+ > #9 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > panic+0x238/0x4e7 kernel/panic.c:184 > __warn.cold.8+0x163/0x1ba kernel/panic.c:536 > report_bug+0x252/0x2d0 lib/bug.c:186 > fixup_bug arch/x86/kernel/traps.c:178 [inline] > do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296 > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 > invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:996 > RIP: 0010:kmalloc_slab+0x56/0x70 mm/slab_common.c:1031 > Code: c5 c0 0a d1 88 5d c3 b8 10 00 00 00 48 85 ff 74 f4 83 ef 01 c1 ef 03 > 0f b6 87 e0 09 d1 88 eb d8 31 c0 81 e6 00 02 00 00 75 db <0f> 0b 5d c3 48 8b > 04 c5 00 0a d1 88 5d c3 66 90 66 2e 0f 1f 84 00 > RSP: 0018:ffff8801ace9f830 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81d0c52d > RDX: ffffffff81d0c5c4 RSI: 0000000000000000 RDI: 000000002f2e0008 > RBP: ffff8801ace9f830 R08: ffff8801ac920700 R09: fffffbfff125691c > R10: fffffbfff125691c R11: ffffffff892b48e3 R12: 000000002f2e0008 > R13: 0000000000600040 R14: ffff8801ace9f998 R15: 0000000000600040 > __do_kmalloc mm/slab.c:3713 [inline] > __kmalloc_track_caller+0x21/0x760 mm/slab.c:3733 > __do_krealloc mm/slab_common.c:1468 [inline] > krealloc+0x65/0xb0 mm/slab_common.c:1515 > vfs_getxattr_alloc+0x274/0x3c0 fs/xattr.c:288 > cap_inode_getsecurity+0x104/0x820 security/commoncap.c:396 > security_inode_getsecurity+0xe1/0x130 security/security.c:866 > xattr_getsecurity fs/xattr.c:243 [inline] > vfs_getxattr+0x1db/0x390 fs/xattr.c:331 > getxattr+0x139/0x2c0 fs/xattr.c:537 > path_getxattr+0x103/0x1b0 fs/xattr.c:565 > __do_sys_getxattr fs/xattr.c:577 [inline] > __se_sys_getxattr fs/xattr.c:574 [inline] > __x64_sys_getxattr+0x9d/0x100 fs/xattr.c:574 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x440559 > Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 > 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff > 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007fff684abf58 EFLAGS: 00000217 ORIG_RAX: 00000000000000bf > RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440559 > RDX: 00000000200002c0 RSI: 0000000020000500 RDI: 00000000200004c0 > RBP: 64663d736e617274 R08: 00007fff684ac0d8 R09: 00007fff684ac0d8 > R10: 0000000000000143 R11: 0000000000000217 R12: 0000000000401de0 > R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > 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#bug-status-tracking 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/00000000000083a940057140518a%40google.com. > For more options, visit https://groups.google.com/d/optout.
