syzbot


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

Status: fixed on 2018/08/07 13:43
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+35414afaff60f0fa7b91@syzkaller.appspotmail.com
Fix commit: 99ba2b5aba24 bpf: sockhash, disallow bpf_tcp_close and update in parallel
First crash: 2128d, last: 2128d

Sample crash report:
==================================================================
PANIC: double fault, error_code: 0x0
BUG: KASAN: stack-out-of-bounds in __tlb_remove_page_size+0x426/0x500 mm/memory.c:314
Read of size 4 at addr ffff880198ac5008 by task modprobe/23657
CPU: 0 PID: 23642 Comm: syz-executor6 Not tainted 4.18.0-rc3+ #58

CPU: 1 PID: 23657 Comm: modprobe Not tainted 4.18.0-rc3+ #58
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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
Call Trace:
Code: 41 
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
57 41 
89 cf 
41 56 
41 
55 49 
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
89 fd 
41 
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
54 45 
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
 __tlb_remove_page_size+0x426/0x500 mm/memory.c:314
89 
 __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
cc 
53 
65 4c 
8b 
34 
25 40 
ee 01 
00 48 
83 e4 
f0 48 
81 
ec 
60 03 
00 00 
48 
8b 45 
 unmap_single_vma+0x1a0/0x310 mm/memory.c:1553
10 <89> 
 unmap_vmas+0x120/0x1f0 mm/memory.c:1583
94 24 
 exit_mmap+0x2c2/0x5b0 mm/mmap.c:3105
80 00 
00 00 
 __mmput kernel/fork.c:970 [inline]
 mmput+0x265/0x620 kernel/fork.c:991
48 ba 
00 00 
00 00 
00 fc 
ff df 
48 89 
84 24 
98 
 exit_mm kernel/exit.c:544 [inline]
 do_exit+0xea9/0x2750 kernel/exit.c:852
RSP: 0018:ffff8801981ffe90 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 1ffff1003304004f RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
RBP: ffff880198200220 R08: 0000000000000000 R09: 0000000000000000
R10: ffff880198b5fbe0 R11: ffff8801b1b9ccfb R12: 0000000000000000
R13: ffffffff88f92620 R14: ffff8801b1b9c580 R15: 0000000000000002
FS:  0000000000cd8940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801981ffe88 CR3: 000000019a5bf000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 00000000200001c0 DR2: 0000000000000100
DR3: 0000000000000100 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/21 07:20 bpf-next 8ae71e76cf1f 8cc079c3 .config console log report ci-upstream-bpf-next-kasan-gce
* Struck through repros no longer work on HEAD.