syzbot


KASAN: use-after-free Read in dbAdjTree

Status: upstream: reported C repro on 2022/10/31 14:16
Reported-by: syzbot+53390df14fd653c557fd@syzkaller.appspotmail.com
First crash: 532d, last: 415d
Fix bisection: failed (error log, bisect log)
  
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream UBSAN: array-index-out-of-bounds in dbAdjTree jfs C error error 41 89d 567d 26/26 fixed on 2024/01/30 15:47
linux-4.14 KASAN: slab-out-of-bounds Read in dbAdjTree C 3 413d 560d 0/1 upstream: reported C repro on 2022/10/03 00:17

Sample crash report:
IPVS: ftp: loaded support on port[0] = 21
audit: type=1800 audit(1677324559.326:2): pid=8068 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor140" name="bus" dev="loop0" ino=7 res=0
BUG: unable to handle kernel paging request at ffffed101984af44
PGD 23fff3067 P4D 23fff3067 PUD 13fff8067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1985 Comm: jfsCommit Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
RIP: 0010:dbAdjTree+0x202/0x2c0 fs/jfs/jfs_dmap.c:2936
Code: 00 41 0f b6 55 01 44 38 f8 4c 63 eb 41 0f 4c c7 4a 8d 7c 2d 11 38 d0 48 89 f9 0f 4d d0 83 e1 07 41 89 d7 48 89 fa 48 c1 ea 03 <42> 0f b6 14 22 38 ca 7f 04 84 d2 75 51 42 0f b6 54 2d 11 44 89 fe
RSP: 0018:ffff8880b0a87b00 EFLAGS: 00010a06
RAX: 0000000000000003 RBX: 0000000018dd1a00 RCX: 0000000000000001
RDX: 1ffff1101984af44 RSI: 0000000000000003 RDI: ffff8880cc257a21
RBP: ffff8880b3486010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000018dd1a00 R14: 0000000000000000 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed101984af44 CR3: 0000000092a1c000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 dbJoin+0x1d0/0x220 fs/jfs/jfs_dmap.c:2877
 dbFreeBits+0xf0/0x710 fs/jfs/jfs_dmap.c:2378
 dbFreeDmap+0x61/0x1a0 fs/jfs/jfs_dmap.c:2127
 dbFree+0x252/0x500 fs/jfs/jfs_dmap.c:385
 txFreeMap+0x7a4/0xb20 fs/jfs/jfs_txnmgr.c:2579
 txUpdateMap+0x369/0x1000 fs/jfs/jfs_txnmgr.c:2375
 txLazyCommit fs/jfs/jfs_txnmgr.c:2709 [inline]
 jfs_lazycommit+0x525/0x9d0 fs/jfs/jfs_txnmgr.c:2777
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
CR2: ffffed101984af44
---[ end trace d8869791503610ca ]---
RIP: 0010:dbAdjTree+0x202/0x2c0 fs/jfs/jfs_dmap.c:2936
Code: 00 41 0f b6 55 01 44 38 f8 4c 63 eb 41 0f 4c c7 4a 8d 7c 2d 11 38 d0 48 89 f9 0f 4d d0 83 e1 07 41 89 d7 48 89 fa 48 c1 ea 03 <42> 0f b6 14 22 38 ca 7f 04 84 d2 75 51 42 0f b6 54 2d 11 44 89 fe
RSP: 0018:ffff8880b0a87b00 EFLAGS: 00010a06
RAX: 0000000000000003 RBX: 0000000018dd1a00 RCX: 0000000000000001
RDX: 1ffff1101984af44 RSI: 0000000000000003 RDI: ffff8880cc257a21
RBP: ffff8880b3486010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000018dd1a00 R14: 0000000000000000 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed101984af44 CR3: 0000000092a1c000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 41 0f             	add    %al,0xf(%rcx)
   3:	b6 55                	mov    $0x55,%dh
   5:	01 44 38 f8          	add    %eax,-0x8(%rax,%rdi,1)
   9:	4c 63 eb             	movslq %ebx,%r13
   c:	41 0f 4c c7          	cmovl  %r15d,%eax
  10:	4a 8d 7c 2d 11       	lea    0x11(%rbp,%r13,1),%rdi
  15:	38 d0                	cmp    %dl,%al
  17:	48 89 f9             	mov    %rdi,%rcx
  1a:	0f 4d d0             	cmovge %eax,%edx
  1d:	83 e1 07             	and    $0x7,%ecx
  20:	41 89 d7             	mov    %edx,%r15d
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	42 0f b6 14 22       	movzbl (%rdx,%r12,1),%edx <-- trapping instruction
  2f:	38 ca                	cmp    %cl,%dl
  31:	7f 04                	jg     0x37
  33:	84 d2                	test   %dl,%dl
  35:	75 51                	jne    0x88
  37:	42 0f b6 54 2d 11    	movzbl 0x11(%rbp,%r13,1),%edx
  3d:	44 89 fe             	mov    %r15d,%esi

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/02/25 11:31 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 BUG: unable to handle kernel paging request in dbAdjTree
2022/11/06 18:59 linux-4.19.y 3f8a27f9e27b 6d752409 .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 BUG: unable to handle kernel paging request in dbAdjTree
2022/10/31 14:15 linux-4.19.y 3f8a27f9e27b 2a71366b .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: use-after-free Read in dbAdjTree
2022/11/12 02:27 linux-4.19.y 3f8a27f9e27b f42ee5d8 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in dbAdjTree
2022/11/06 18:15 linux-4.19.y 3f8a27f9e27b 6d752409 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 BUG: unable to handle kernel paging request in dbAdjTree
* Struck through repros no longer work on HEAD.