syzbot
BUG: unable to handle kernel paging request in pcpu_freelist_populate
Status: fixed on 2021/03/10 01:48
Subsystems:
bpf
[Documentation on labels]
Fix commit:
e1868b9e36d0
bpf: Avoid overflows involving hash elem_size
First crash: 2058d, last: 2047d
Sample crash report:
BUG: unable to handle page fault for address: fffff5200686aa39
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23fff2067 P4D 23fff2067 PUD 101a4067 PMD 358e8067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8494 Comm: syz-executor408 Not tainted 5.10.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:pcpu_freelist_push_node kernel/bpf/percpu_freelist.c:33 [inline]
RIP: 0010:pcpu_freelist_populate+0x1a5/0x260 kernel/bpf/percpu_freelist.c:114
Code: 85 8f 00 00 00 48 8b 04 24 48 03 2c c5 c0 16 e4 8a 48 89 e8 48 c1 e8 03 42 80 3c 30 00 75 6b 48 89 da 48 8b 45 00 48 c1 ea 03 <42> 80 3c 32 00 75 45 48 89 03 44 89 ee 44 89 e7 48 89 5d 00 48 03
RSP: 0018:ffffc9000163fc30 EFLAGS: 00010a06
RAX: ffffc9003414b368 RBX: ffffc900343551c8 RCX: ffffffff8184af27
RDX: 1ffff9200686aa39 RSI: ffffffff8184af34 RDI: 0000000000000005
RBP: ffffe8ffffc31e68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000013b
R13: 0000000000004003 R14: dffffc0000000000 R15: ffff8880208069c0
FS: 0000000000eef880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff5200686aa39 CR3: 000000001164a000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
prealloc_init kernel/bpf/hashtab.c:323 [inline]
htab_map_alloc+0x981/0x1230 kernel/bpf/hashtab.c:507
find_and_alloc_map kernel/bpf/syscall.c:123 [inline]
map_create kernel/bpf/syscall.c:829 [inline]
__do_sys_bpf+0xa81/0x5170 kernel/bpf/syscall.c:4374
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4412e9
Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 1b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc6428d8b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004412e9
RDX: 0000000000000040 RSI: 00000000200002c0 RDI: 0000000000000000
RBP: 00000000006cb018 R08: 0000000000000004 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402090
R13: 0000000000402120 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
CR2: fffff5200686aa39
---[ end trace f4fc32505ab0c3de ]---
RIP: 0010:pcpu_freelist_push_node kernel/bpf/percpu_freelist.c:33 [inline]
RIP: 0010:pcpu_freelist_populate+0x1a5/0x260 kernel/bpf/percpu_freelist.c:114
Code: 85 8f 00 00 00 48 8b 04 24 48 03 2c c5 c0 16 e4 8a 48 89 e8 48 c1 e8 03 42 80 3c 30 00 75 6b 48 89 da 48 8b 45 00 48 c1 ea 03 <42> 80 3c 32 00 75 45 48 89 03 44 89 ee 44 89 e7 48 89 5d 00 48 03
RSP: 0018:ffffc9000163fc30 EFLAGS: 00010a06
RAX: ffffc9003414b368 RBX: ffffc900343551c8 RCX: ffffffff8184af27
RDX: 1ffff9200686aa39 RSI: ffffffff8184af34 RDI: 0000000000000005
RBP: ffffe8ffffc31e68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000013b
R13: 0000000000004003 R14: dffffc0000000000 R15: ffff8880208069c0
FS: 0000000000eef880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff5200686aa39 CR3: 000000001164a000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
* Struck through repros no longer work on HEAD.