Hi all,
While fuzzing with trinity inside a KVM tools guest running the latest -next
kernel, I've stumbled on the following spew:
[ 1587.614996] BUG: unable to handle kernel NULL pointer dereference at
0000000000000008
[ 1587.619523] IP: rb_insert_color (lib/rbtree.c:94 lib/rbtree.c:388)
[ 1587.620675] PGD 29dead067 PUD 36687c067 PMD 0
[ 1587.621618] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 1587.623858] Dumping ftrace buffer:
[ 1587.624346] (ftrace buffer empty)
[ 1587.624346] Modules linked in:
[ 1587.624346] CPU: 16 PID: 23740 Comm: trinity-c574 Not tainted
3.17.0-rc2-next-20140827-sasha-00031-g9ff673f #1080
[ 1587.624346] task: ffff8803a49f3000 ti: ffff88040f394000 task.ti:
ffff88040f394000
[ 1587.624346] RIP: rb_insert_color (lib/rbtree.c:94 lib/rbtree.c:388)
[ 1587.624346] RSP: 0018:ffff88040f397dd0 EFLAGS: 00010246
[ 1587.635541] RAX: ffff880372fa4c88 RBX: ffff880271300c84 RCX: 0000000000000000
[ 1587.635541] RDX: 0000000000000000 RSI: ffffffff9c9e9be0 RDI: ffff880271300c88
[ 1587.635541] RBP: ffff88040f397dd0 R08: 0000000000000000 R09: 0000000000000001
[ 1587.635541] R10: 000000000000cb01 R11: 0000000000000001 R12: ffffffff9adaf940
[ 1587.635541] R13: 00000000000000a6 R14: ffff88009bf7a760 R15: ffff880271300c80
[ 1587.635541] FS: 00007f28f4711700(0000) GS:ffff880278200000(0000)
knlGS:0000000000000000
[ 1587.635541] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1587.635541] CR2: 0000000000000008 CR3: 000000029da66000 CR4: 00000000000006a0
[ 1587.635541] Stack:
[ 1587.635541] ffff88040f397e40 ffffffff95a5698f 00000005000000d0
ffff88009bf7a820
[ 1587.635541] 0000000000000000 0000000000000004 ffff880272117400
000036363f010000
[ 1587.635541] 0000000000000005 ffff880272117400 0000000000000003
ffff8803a49f3000
[ 1587.635541] Call Trace:
[ 1587.635541] key_alloc (include/linux/spinlock.h:349 security/keys/key.c:172
security/keys/key.c:313)
[ 1587.635541] keyring_alloc (security/keys/keyring.c:500)
[ 1587.635541] ? creds_are_invalid (kernel/cred.c:701)
[ 1587.635541] install_thread_keyring_to_cred (security/keys/process_keys.c:138)
[ 1587.635541] lookup_user_key (security/keys/process_keys.c:160
security/keys/process_keys.c:538)
[ 1587.635541] ? key_validate (security/keys/process_keys.c:493)
[ 1587.635541] keyctl_set_timeout (include/linux/err.h:35
security/keys/keyctl.c:1334)
[ 1587.635541] SyS_keyctl (security/keys/keyctl.c:1585)
[ 1587.635541] tracesys (arch/x86/kernel/entry_64.S:542)
[ 1587.635541] Code: 8b 50 08 48 85 d2 75 eb 5d c3 31 c0 5d c3 0f 1f 44 00 00
55 48 8b 07 48 89 e5 48 85 c0 0f 84 21 01 00 00 48 8b 10 f6 c2 01 75 62 <48> 8b
4a 08 49 89 d0 48 39 c8 0f 84 93 00 00 00 48 85 c9 74 05
All code
========
0: 8b 50 08 mov 0x8(%rax),%edx
3: 48 85 d2 test %rdx,%rdx
6: 75 eb jne 0xfffffffffffffff3
8: 5d pop %rbp
9: c3 retq
a: 31 c0 xor %eax,%eax
c: 5d pop %rbp
d: c3 retq
e: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
13: 55 push %rbp
14: 48 8b 07 mov (%rdi),%rax
17: 48 89 e5 mov %rsp,%rbp
1a: 48 85 c0 test %rax,%rax
1d: 0f 84 21 01 00 00 je 0x144
23: 48 8b 10 mov (%rax),%rdx
26: f6 c2 01 test $0x1,%dl
29: 75 62 jne 0x8d
2b:* 48 8b 4a 08 mov 0x8(%rdx),%rcx <-- trapping
instruction
2f: 49 89 d0 mov %rdx,%r8
32: 48 39 c8 cmp %rcx,%rax
35: 0f 84 93 00 00 00 je 0xce
3b: 48 85 c9 test %rcx,%rcx
3e: 74 05 je 0x45
...
Code starting with the faulting instruction
===========================================
0: 48 8b 4a 08 mov 0x8(%rdx),%rcx
4: 49 89 d0 mov %rdx,%r8
7: 48 39 c8 cmp %rcx,%rax
a: 0f 84 93 00 00 00 je 0xa3
10: 48 85 c9 test %rcx,%rcx
13: 74 05 je 0x1a
...
[ 1587.635541] RIP rb_insert_color (lib/rbtree.c:94 lib/rbtree.c:388)
[ 1587.635541] RSP <ffff88040f397dd0>
[ 1587.635541] CR2: 0000000000000008
Thanks,
Sasha
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