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general protection fault in unlink_file_vma

Status: fixed on 2020/11/16 12:12
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+c5d5a51dcbb558ca0cb5@syzkaller.appspotmail.com
Fix commit: bc4fe4cdd602 mm: mmap: Fix general protection fault in unlink_file_vma()
First crash: 1330d, last: 1330d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: WARNING in sysfs_warn_dup (log)
Repro: C syz .config
  
▶ ▼ Discussions (11)
Title Replies (including bot) Last reply
[patch 3/5] mm: mmap: fix general protection fault in unlink_file_vma() 2 (2) 2020/10/12 12:19
[PATCH] mm: mmap: Fix general protection fault in unlink_file_vma() 2 (2) 2020/10/07 19:04
Re: general protection fault in unlink_file_vma 1 (1) 2020/09/16 09:05
Re: general protection fault in unlink_file_vma 1 (2) 2020/09/16 08:39
Re: general protection fault in unlink_file_vma 1 (2) 2020/09/16 04:24
Re: general protection fault in unlink_file_vma 1 (1) 2020/09/15 11:13
Re: general protection fault in unlink_file_vma 1 (2) 2020/09/15 09:36
Re: general protection fault in unlink_file_vma 1 (1) 2020/09/14 01:51
Re: general protection fault in unlink_file_vma 2 (2) 2020/09/13 11:16
Re: general protection fault in unlink_file_vma 1 (1) 2020/09/10 06:26
general protection fault in unlink_file_vma 3 (4) 2020/09/10 04:17
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in unlink_file_vma (2) mm reiserfs C inconclusive done 1 111d 305d 0/26 auto-obsoleted due to no activity on 2024/04/15 03:04
▶ ▼ Last patch testing requests (4)
Created Duration User Patch Repo Result
2020/09/16 06:50 11m linmiaohe@huawei.com https://github.com/Linmiaohe/linux vma_merge_fix report log
2020/09/16 01:48 11m linmiaohe@huawei.com https://github.com/Linmiaohe/linux vma_merge_fix report log
2020/09/14 06:42 11m linmiaohe@huawei.com https://github.com/Linmiaohe/linux/ 796cd8f497d5b62b00667229375326381c32bdb3 report log
2020/09/09 18:46 11m anmol.karan123@gmail.com upstream report log

Sample crash report:
general protection fault, probably for non-canonical address 0xe00eeaee0000003b: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x00777770000001d8-0x00777770000001df]
CPU: 1 PID: 10488 Comm: syz-executor721 Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:unlink_file_vma+0x57/0xb0 mm/mmap.c:164
Code: 4c 8b a5 a0 00 00 00 4d 85 e4 74 4e e8 92 d7 cd ff 49 8d bc 24 d8 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 3d 4d 8b b4 24 d8 01 00 00 4d 8d 6e 78 4c 89 ef e8
RSP: 0018:ffffc9000ac0f9b0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88800010ceb0 RCX: ffffffff81592421
RDX: 000eeeee0000003b RSI: ffffffff81a6736e RDI: 00777770000001d8
RBP: ffff88800010ceb0 R08: 0000000000000001 R09: ffff88801291a50f
R10: ffffed10025234a1 R11: 0000000000000001 R12: 0077777000000000
R13: 00007f1eea0da000 R14: 00007f1eea0d9000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1eea11a9d0 CR3: 000000000007e000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 free_pgtables+0x1b3/0x2f0 mm/memory.c:415
 exit_mmap+0x2c0/0x530 mm/mmap.c:3184
 __mmput+0x122/0x470 kernel/fork.c:1076
 mmput+0x53/0x60 kernel/fork.c:1097
 exit_mm kernel/exit.c:483 [inline]
 do_exit+0xa8b/0x29f0 kernel/exit.c:793
 do_group_exit+0x125/0x310 kernel/exit.c:903
 get_signal+0x428/0x1f00 kernel/signal.c:2757
 arch_do_signal+0x82/0x2520 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:136 [inline]
 exit_to_user_mode_prepare+0x1ae/0x200 kernel/entry/common.c:167
 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:242
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x446ad9
Code: Bad RIP value.
RSP: 002b:00007f1eea0f8d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dbc58 RCX: 0000000000446ad9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc58
RBP: 00000000006dbc50 R08: 65732f636f72702f R09: 65732f636f72702f
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc5c
R13: 00007f1eea0f8d20 R14: 00007f1eea0f8d20 R15: 20c49ba5e353f7cf
Modules linked in:
---[ end trace 22e4d2773b69c9b0 ]---
RIP: 0010:unlink_file_vma+0x57/0xb0 mm/mmap.c:164
Code: 4c 8b a5 a0 00 00 00 4d 85 e4 74 4e e8 92 d7 cd ff 49 8d bc 24 d8 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 3d 4d 8b b4 24 d8 01 00 00 4d 8d 6e 78 4c 89 ef e8
RSP: 0018:ffffc9000ac0f9b0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88800010ceb0 RCX: ffffffff81592421
RDX: 000eeeee0000003b RSI: ffffffff81a6736e RDI: 00777770000001d8
RBP: ffff88800010ceb0 R08: 0000000000000001 R09: ffff88801291a50f
R10: ffffed10025234a1 R11: 0000000000000001 R12: 0077777000000000
R13: 00007f1eea0da000 R14: 00007f1eea0d9000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1eea11a9d0 CR3: 000000000007e000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/09/05 00:10 upstream 59126901f200 abf9ba4f .config console log report syz C ci-upstream-kasan-gce
* Struck through repros no longer work on HEAD.