syzbot


KASAN: stack-out-of-bounds Write in __tlb_remove_page_size

Status: fixed on 2018/08/07 13:43
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+272b26875d5276d885ee@syzkaller.appspotmail.com
Fix commit: 99ba2b5aba24 bpf: sockhash, disallow bpf_tcp_close and update in parallel
First crash: 2127d, last: 2127d

Sample crash report:
==================================================================
BUG: KASAN: stack-out-of-bounds in __tlb_remove_page_size+0x448/0x500 mm/memory.c:314
PANIC: double fault, error_code: 0x0
Write of size 8 at addr ffff88019ad6c7a8 by task syz-executor1/11392
CPU: 1 PID: 11378 Comm: syz-executor0 Not tainted 4.18.0-rc3+ #58

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_acquire+0x2e/0x5020 kernel/locking/lockdep.c:3294
CPU: 0 PID: 11392 Comm: syz-executor1 Not tainted 4.18.0-rc3+ #58
Code: 41 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
57 41 
Call Trace:
89 cf 
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
41 56 
41 55 
49 89 
fd 41 
54 
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
45 89 
cc 53 
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
65 
 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:438
4c 8b 
 __tlb_remove_page_size+0x448/0x500 mm/memory.c:314
34 25 
 __tlb_remove_page include/asm-generic/tlb.h:150 [inline]
 zap_pte_range mm/memory.c:1336 [inline]
 zap_pmd_range mm/memory.c:1437 [inline]
 zap_pud_range mm/memory.c:1466 [inline]
 zap_p4d_range mm/memory.c:1487 [inline]
 unmap_page_range+0x1059/0x2220 mm/memory.c:1508
40 ee 
01 00 
48 83 
e4 f0 
48 
81 ec 
60 03 
00 00 
48 8b 
45 10 
<89> 94 
24 80 
00 00 
00 48 
ba 00 
00 
00 
00 00 
fc ff 
 unmap_single_vma+0x1a0/0x310 mm/memory.c:1553
df 48 
 unmap_vmas+0x120/0x1f0 mm/memory.c:1583
89 84 
 exit_mmap+0x2c2/0x5b0 mm/mmap.c:3105
24 98 
RSP: 0018:ffff88019a0e2db0 EFLAGS: 00010082
 __mmput kernel/fork.c:970 [inline]
 mmput+0x265/0x620 kernel/fork.c:991
RAX: 0000000000000000 RBX: 1ffff1003341c633 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
RBP: ffff88019a0e3140 R08: 0000000000000000 R09: 0000000000000000
R10: ffff88019af0fbe0 R11: ffff8801c7200a3b R12: 0000000000000000
R13: ffffffff88f92620 R14: ffff8801c72002c0 R15: 0000000000000002
FS:  00000000020ac940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88019a0e2da8 CR3: 00000001b0815000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/22 03:26 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
* Struck through repros no longer work on HEAD.