syzbot


general protection fault in hfs_find_init

Status: upstream: reported C repro on 2022/11/26 21:41
Subsystems: hfs
[Documentation on labels]
Reported-by: syzbot+28ba727393808920094c@syzkaller.appspotmail.com
First crash: 509d, last: 413d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 general protection fault in hfs_find_init hfs C 3 412d 502d 0/1 upstream: reported C repro on 2022/12/03 11:10
linux-5.15 BUG: unable to handle kernel paging request in hfs_find_init origin:upstream C error 18 23d 379d 0/3 upstream: reported C repro on 2023/04/05 08:29
upstream general protection fault in hfs_find_init hfs C done 706 1d20h 2210d 0/26 upstream: reported C repro on 2018/03/31 20:47
linux-6.1 BUG: unable to handle kernel paging request in hfs_find_init origin:upstream C 24 9d06h 402d 0/3 upstream: reported C repro on 2023/03/13 10:13

Sample crash report:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8112 Comm: syz-executor396 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:hfs_find_init+0x70/0x230 fs/hfs/bfind.c:21
Code: c1 ea 03 80 3c 02 00 0f 85 bc 01 00 00 4c 8d 6b 40 48 c7 45 18 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 6b 01 00 00 8b 43 40 be c0 00
RSP: 0018:ffff8880971e7530 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81fe0980
RDX: 0000000000000008 RSI: ffffffff81fd1c41 RDI: ffff8880971e75b0
RBP: ffff8880971e7598 R08: 0000000000000000 R09: 0000000000000004
R10: 0000000000000004 R11: 0000000000074071 R12: ffff8880ab31a340
R13: 0000000000000040 R14: ffff888094d37772 R15: ffff8880971e7598
FS:  0000555556eef300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffc2a46000 CR3: 00000000a44fc000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 hfs_ext_read_extent+0x191/0xa20 fs/hfs/extent.c:200
 hfs_get_block+0x53d/0x7e0 fs/hfs/extent.c:366
 block_read_full_page+0x288/0xd10 fs/buffer.c:2259
 do_read_cache_page+0x533/0x1170 mm/filemap.c:2828
 read_mapping_page include/linux/pagemap.h:402 [inline]
 hfs_btree_open+0x6ae/0x1430 fs/hfs/btree.c:78
 hfs_mdb_get+0x1402/0x1cf0 fs/hfs/mdb.c:193
 hfs_fill_super+0xd6a/0x1310 fs/hfs/super.c:413
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2492 [inline]
 do_mount+0x115c/0x2f50 fs/namespace.c:2822
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f40c8337afa
Code: 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffc2a45918 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f40c8337afa
RDX: 0000000020000240 RSI: 0000000020000000 RDI: 00007fffc2a45930
RBP: 00007fffc2a45930 R08: 00007fffc2a45970 R09: 0000000000000248
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000004
R13: 0000555556eef2c0 R14: 0000000000000000 R15: 00007fffc2a45970
Modules linked in:
---[ end trace 87cc7595134734a3 ]---
RIP: 0010:hfs_find_init+0x70/0x230 fs/hfs/bfind.c:21
Code: c1 ea 03 80 3c 02 00 0f 85 bc 01 00 00 4c 8d 6b 40 48 c7 45 18 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 6b 01 00 00 8b 43 40 be c0 00
RSP: 0018:ffff8880971e7530 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81fe0980
RDX: 0000000000000008 RSI: ffffffff81fd1c41 RDI: ffff8880971e75b0
RBP: ffff8880971e7598 R08: 0000000000000000 R09: 0000000000000004
R10: 0000000000000004 R11: 0000000000074071 R12: ffff8880ab31a340
R13: 0000000000000040 R14: ffff888094d37772 R15: ffff8880971e7598
FS:  0000555556eef300(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055667a475500 CR3: 00000000a44fc000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c1 ea 03             	shr    $0x3,%edx
   3:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   7:	0f 85 bc 01 00 00    	jne    0x1c9
   d:	4c 8d 6b 40          	lea    0x40(%rbx),%r13
  11:	48 c7 45 18 00 00 00 	movq   $0x0,0x18(%rbp)
  18:	00
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	4c 89 ea             	mov    %r13,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e 6b 01 00 00    	jle    0x1a5
  3a:	8b 43 40             	mov    0x40(%rbx),%eax
  3d:	be                   	.byte 0xbe
  3e:	c0                   	.byte 0xc0

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/12/23 08:04 linux-4.19.y 3f8a27f9e27b 9da18ae8 .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 general protection fault in hfs_find_init
2022/11/26 21:41 linux-4.19.y 3f8a27f9e27b f4470a7b .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 general protection fault in hfs_find_init
2023/03/02 11:28 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 general protection fault in hfs_find_init
2023/03/01 13:29 linux-4.19.y 3f8a27f9e27b ef65e6cb .config console log report info [disk image] [vmlinux] ci2-linux-4-19 general protection fault in hfs_find_init
2023/02/27 06:12 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 general protection fault in hfs_find_init
2023/02/21 18:13 linux-4.19.y 3f8a27f9e27b f949448d .config console log report info [disk image] [vmlinux] ci2-linux-4-19 general protection fault in hfs_find_init
2023/02/20 16:57 linux-4.19.y 3f8a27f9e27b bcdf85f8 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 general protection fault in hfs_find_init
2023/02/13 17:48 linux-4.19.y 3f8a27f9e27b 957959cb .config console log report info [disk image] [vmlinux] ci2-linux-4-19 general protection fault in hfs_find_init
2023/02/02 08:10 linux-4.19.y 3f8a27f9e27b 9a6f477c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 general protection fault in hfs_find_init
2023/02/02 04:12 linux-4.19.y 3f8a27f9e27b 9a6f477c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 general protection fault in hfs_find_init
2023/01/31 15:02 linux-4.19.y 3f8a27f9e27b b68fb8d6 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 general protection fault in hfs_find_init
2022/12/25 11:02 linux-4.19.y 3f8a27f9e27b 9da18ae8 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 general protection fault in hfs_find_init
* Struck through repros no longer work on HEAD.