Message-ID: <CACkBjsbaCmZK2wUExMqu_KKBr2jnEi-T6iEr=vzw4YS5g5DOOQ@mail.gmail.com>
Date:   Wed, 6 Oct 2021 16:14:43 +0800
From:   Hao Sun <sunhao.th@...il.com>
To:     djwong@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-xfs@...r.kernel.org
Subject: BUG: unable to handle kernel NULL pointer dereference in xlog_cil_commit

Hello,

When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.

HEAD commit: 0513e464f900 Merge tag 'perf-tools-fixes-for-v5.15-2021-09-27'
git tree: upstream
console output:
https://drive.google.com/file/d/1vm5fDM220kkghoiGa3Aw_Prl4O_pqAXF/view?usp=sharing
kernel config: https://drive.google.com/file/d/1Jqhc4DpCVE8X7d-XBdQnrMoQzifTG5ho/view?usp=sharing

Sorry, I don't have a reproducer for this crash, hope the symbolized
report can help.
If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@...il.com>

FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 28965 Comm: syz-executor Not tainted 5.15.0-rc3+ #21
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail+0x13c/0x160 lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1328
 slab_pre_alloc_hook.constprop.99+0x4e/0xc0 mm/slab.h:494
 slab_alloc_node mm/slub.c:3120 [inline]
 __kmalloc_node+0x6b/0x240 mm/slub.c:4435
 kmalloc_node include/linux/slab.h:614 [inline]
 kvmalloc_node+0x33/0xe0 mm/util.c:587
 kvmalloc include/linux/mm.h:805 [inline]
 xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:224 [inline]
 xlog_cil_commit+0x181/0xe20 fs/xfs/xfs_log_cil.c:1280
 __xfs_trans_commit+0x239/0x5a0 fs/xfs/xfs_trans.c:881
 xfs_create+0x80b/0x900 fs/xfs/xfs_inode.c:1091
 xfs_generic_create+0x16c/0x470 fs/xfs/xfs_iops.c:197
 lookup_open+0x660/0x780 fs/namei.c:3282
 open_last_lookups fs/namei.c:3352 [inline]
 path_openat+0x465/0xe20 fs/namei.c:3557
 do_filp_open+0xe3/0x170 fs/namei.c:3588
 do_sys_openat2+0x357/0x4a0 fs/open.c:1200
 do_sys_open+0x87/0xd0 fs/open.c:1216
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x46ae99
Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f847c2eec48 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 000000000078c158 RCX: 000000000046ae99
RDX: 0000000000000000 RSI: 0000000000000021 RDI: 00000000200b5040
RBP: 00007f847c2eec80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c
R13: 0000000000000000 R14: 000000000078c158 R15: 00007ffd4ca99420
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 10a56e067 P4D 10a56e067 PUD 10e1e3067 PMD 0
Oops: 0002 [#1] PREEMPT SMP
CPU: 0 PID: 28965 Comm: syz-executor Not tainted 5.15.0-rc3+ #21
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:64
Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6
f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa
4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01
RSP: 0018:ffffc9000efab998 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff88810fa73198 RCX: 0000000000000058
RDX: 0000000000000058 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888110c00108 R08: 0000000000000cc0 R09: 0000000000000000
R10: ffffffff81499943 R11: 0000000000000005 R12: 0000000000000210
R13: 0000000000000000 R14: 0000000000000268 R15: 0000000000000000
FS:  00007f847c2ef700(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010c42b000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
PKRU: 55555554
Call Trace:
 memset include/linux/fortify-string.h:175 [inline]
 xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:225 [inline]
 xlog_cil_commit+0x1a1/0xe20 fs/xfs/xfs_log_cil.c:1280
 __xfs_trans_commit+0x239/0x5a0 fs/xfs/xfs_trans.c:881
 xfs_create+0x80b/0x900 fs/xfs/xfs_inode.c:1091
 xfs_generic_create+0x16c/0x470 fs/xfs/xfs_iops.c:197
 lookup_open+0x660/0x780 fs/namei.c:3282
 open_last_lookups fs/namei.c:3352 [inline]
 path_openat+0x465/0xe20 fs/namei.c:3557
 do_filp_open+0xe3/0x170 fs/namei.c:3588
 do_sys_openat2+0x357/0x4a0 fs/open.c:1200
 do_sys_open+0x87/0xd0 fs/open.c:1216
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x46ae99
Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f847c2eec48 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 000000000078c158 RCX: 000000000046ae99
RDX: 0000000000000000 RSI: 0000000000000021 RDI: 00000000200b5040
RBP: 00007f847c2eec80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c
R13: 0000000000000000 R14: 000000000078c158 R15: 00007ffd4ca99420
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000000
---[ end trace 1d10d5c699ef1895 ]---
RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:64
Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6
f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa
4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01
RSP: 0018:ffffc9000efab998 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff88810fa73198 RCX: 0000000000000058
RDX: 0000000000000058 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888110c00108 R08: 0000000000000cc0 R09: 0000000000000000
R10: ffffffff81499943 R11: 0000000000000005 R12: 0000000000000210
R13: 0000000000000000 R14: 0000000000000268 R15: 0000000000000000
FS:  00007f847c2ef700(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010c42b000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
PKRU: 55555554
----------------
Code disassembly (best guess):
   0: c1 e9 03              shr    $0x3,%ecx
   3: 40 0f b6 f6          movzbl %sil,%esi
   7: 48 b8 01 01 01 01 01 movabs $0x101010101010101,%rax
   e: 01 01 01
  11: 48 0f af c6          imul   %rsi,%rax
  15: f3 48 ab              rep stos %rax,%es:(%rdi)
  18: 89 d1                mov    %edx,%ecx
  1a: f3 aa                rep stos %al,%es:(%rdi)
  1c: 4c 89 c8              mov    %r9,%rax
  1f: c3                    retq
  20: 90                    nop
  21: 49 89 f9              mov    %rdi,%r9
  24: 40 88 f0              mov    %sil,%al
  27: 48 89 d1              mov    %rdx,%rcx
* 2a: f3 aa                rep stos %al,%es:(%rdi) <-- trapping instruction
  2c: 4c 89 c8              mov    %r9,%rax
  2f: c3                    retq
  30: 90                    nop
  31: 49 89 fa              mov    %rdi,%r10
  34: 40 0f b6 ce          movzbl %sil,%ecx
  38: 48                    rex.W
  39: b8 01 01 01 01        mov    $0x1010101,%eax
  3e: 01 01                add    %eax,(%rcx)

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