syzbot


general protection fault in pending_reads_dispatch_ioctl

Status: fixed on 2022/02/25 18:09
Reported-by: syzbot+3818f2a1c2c0e58fd214@syzkaller.appspotmail.com
Fix commit: 4b1862e4fc69 ANDROID: incremental-fs: fix GPF in pending_reads_dispatch_ioctl
First crash: 403d, last: 372d

Cause bisection: failed (bisect log)
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-54 general protection fault in pending_reads_dispatch_ioctl C 10 380d 726d 0/2 upstream: reported C repro on 2021/02/12 03:08

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 PID: 365 Comm: syz-executor368 Not tainted 5.10.89-syzkaller-00788-g9b28b48fb343 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ioctl_permit_fill fs/incfs/pseudo_files.c:153 [inline]
RIP: 0010:pending_reads_dispatch_ioctl+0x958/0x2c80 fs/incfs/pseudo_files.c:1026
Code: 4e 3f 63 ff 49 c7 c4 f9 ff ff ff 48 8b 5c 24 20 e9 1b 08 00 00 49 8d 5e 28 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 8a 1b 9d ff 48 c7 c0 c0 57 43 85 48
RSP: 0018:ffffc90000b17b60 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000069662f2e RDI: 0000000000000040
RBP: ffffc90000b17eb8 R08: ffffffff81b64e0b R09: 0000000000000003
R10: fffff52000162fa5 R11: 0000000000000004 R12: 1ffff92000162fa4
R13: 1ffff11020ebe464 R14: 0000000000000000 R15: ffff8881075f2320
FS:  0000555556e453c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001073ef000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0x115/0x190 fs/ioctl.c:739
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f66aaf4bc49
Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 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 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffedddae398 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffedddae3a8 RCX: 00007f66aaf4bc49
RDX: 0000000020000000 RSI: 0000000040046721 RDI: 0000000000000004
RBP: 00007ffedddae3a0 R08: 00007f66aaf0a1b0 R09: 00007f66aaf0a1b0
R10: 00007f66aaf0a1b0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 30d26f19d5073862 ]---
RIP: 0010:ioctl_permit_fill fs/incfs/pseudo_files.c:153 [inline]
RIP: 0010:pending_reads_dispatch_ioctl+0x958/0x2c80 fs/incfs/pseudo_files.c:1026
Code: 4e 3f 63 ff 49 c7 c4 f9 ff ff ff 48 8b 5c 24 20 e9 1b 08 00 00 49 8d 5e 28 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 8a 1b 9d ff 48 c7 c0 c0 57 43 85 48
RSP: 0018:ffffc90000b17b60 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000028 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000069662f2e RDI: 0000000000000040
RBP: ffffc90000b17eb8 R08: ffffffff81b64e0b R09: 0000000000000003
R10: fffff52000162fa5 R11: 0000000000000004 R12: 1ffff92000162fa4
R13: 1ffff11020ebe464 R14: 0000000000000000 R15: ffff8881075f2320
FS:  0000555556e453c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001073ef000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4e 3f                	rex.WRX (bad)
   2:	63 ff                	movsxd %edi,%edi
   4:	49 c7 c4 f9 ff ff ff 	mov    $0xfffffffffffffff9,%r12
   b:	48 8b 5c 24 20       	mov    0x20(%rsp),%rbx
  10:	e9 1b 08 00 00       	jmpq   0x830
  15:	49 8d 5e 28          	lea    0x28(%r14),%rbx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	48 89 df             	mov    %rbx,%rdi
  33:	e8 8a 1b 9d ff       	callq  0xff9d1bc2
  38:	48 c7 c0 c0 57 43 85 	mov    $0xffffffff854357c0,%rax
  3f:	48                   	rex.W

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci2-android-5-10 2021/12/31 17:55 android12-5.10-lts 9b28b48fb343 36bd2e48 .config console log report syz C general protection fault in pending_reads_dispatch_ioctl
ci2-android-5-10 2022/02/01 08:43 android12-5.10-lts 0347b1658399 6b7c57fe .config console log report info general protection fault in pending_reads_dispatch_ioctl
ci2-android-5-10 2022/01/12 13:21 android12-5.10-lts d605f2f30d54 44d1319a .config console log report info general protection fault in pending_reads_dispatch_ioctl
ci2-android-5-10 2021/12/31 17:44 android12-5.10-lts 9b28b48fb343 36bd2e48 .config console log report info general protection fault in pending_reads_dispatch_ioctl
* Struck through repros no longer work on HEAD.