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Message-ID: <CACkBjsau_-kjBKUJG2kOZcFzVuxr+VZOL3dgu6k8Brm+EbXVFA@mail.gmail.com>
Date: Thu, 14 Oct 2021 10:42:53 +0800
From: Hao Sun <sunhao.th@...il.com>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: general protection fault in __block_write_begin_int
Hao Sun <sunhao.th@...il.com> 于2021年9月20日周一 下午8:58写道：
>
> Hello,
>
> When using Healer to fuzz the latest Linux kernel, the following crash
> was triggered.
>
> HEAD commit: 4357f03d6611 Merge tag 'pm-5.15-rc2
> git tree: upstream
> console output:
> https://drive.google.com/file/d/1r4iaWNbcFSZEw3dpTM2tbE3sPZbaXQ_Y/view?usp=sharing
> kernel config: https://drive.google.com/file/d/1HKZtF_s3l6PL3OoQbNq_ei9CdBus-Tz0/view?usp=sharing
> C reproducer: https://drive.google.com/file/d/13JjyIW6yKhM9QIYvC3IfDXAtjw_2Rrmt/view?usp=sharing
> Syzlang reproducer:
> https://drive.google.com/file/d/1sxTq_kx4Yw8nD06mQQ7Ah_cCEg75yalF/view?usp=sharing
>
> If you fix this issue, please add the following tag to the commit:
> Reported-by: Hao Sun <sunhao.th@...il.com>
>
> general protection fault, probably for non-canonical address
> 0xdead000000000200: 0000 [#1] PREEMPT SMP
> CPU: 2 PID: 11649 Comm: syz-executor Not tainted 5.15.0-rc1+ #19
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> RIP: 0010:__block_write_begin_int+0xde/0xae0 fs/buffer.c:1973
> Code: 00 00 0f 87 65 06 00 00 e8 df bd d6 ff 45 85 e4 0f 85 5e 06 00
> 00 e8 d1 bd d6 ff 48 8b 45 18 31 d2 48 89 ef 41 bc 0c 00 00 00 <48> 8b
> 00 48 89 c6 48 89 44 24 20 e8 02 a4 ff ff 4c 8b 7d 20 48 8b
> RSP: 0018:ffffc9000ab13980 EFLAGS: 00010246
> RAX: dead000000000200 RBX: ffffea0004568000 RCX: ffffc900025b9000
> RDX: 0000000000000000 RSI: ffffffff8160d34f RDI: ffffea0004568040
> RBP: ffffea0004568040 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000c
> R13: ffffc9000ab13aa0 R14: ffffffff821f8f70 R15: 0000000000000000
> FS: 00007f39bbe26700(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000100000001 CR3: 000000010b767000 CR4: 0000000000750ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554
> Call Trace:
> __block_write_begin fs/buffer.c:2056 [inline]
> block_write_begin+0x58/0x150 fs/buffer.c:2116
> generic_perform_write+0xce/0x220 mm/filemap.c:3770
> __generic_file_write_iter+0x20d/0x240 mm/filemap.c:3897
> blkdev_write_iter+0xed/0x1d0 block/fops.c:518
> call_write_iter include/linux/fs.h:2163 [inline]
> do_iter_readv_writev+0x1e8/0x2b0 fs/read_write.c:729
> do_iter_write+0xaf/0x250 fs/read_write.c:855
> vfs_iter_write+0x38/0x60 fs/read_write.c:896
> iter_file_splice_write+0x2d8/0x450 fs/splice.c:689
> do_splice_from fs/splice.c:767 [inline]
> direct_splice_actor+0x4a/0x80 fs/splice.c:936
> splice_direct_to_actor+0x123/0x2d0 fs/splice.c:891
> do_splice_direct+0xc3/0x110 fs/splice.c:979
> do_sendfile+0x338/0x740 fs/read_write.c:1249
> __do_sys_sendfile64 fs/read_write.c:1314 [inline]
> __se_sys_sendfile64 fs/read_write.c:1300 [inline]
> __x64_sys_sendfile64+0xc7/0xe0 fs/read_write.c:1300
> 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:00007f39bbe25c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
> RAX: ffffffffffffffda RBX: 000000000078c158 RCX: 000000000046ae99
> RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000006
> RBP: 00000000004e4809 R08: 0000000000000000 R09: 0000000000000000
> R10: 00000000464e681a R11: 0000000000000246 R12: 000000000078c158
> R13: 0000000000000000 R14: 000000000078c158 R15: 00007ffeddcbc7a0
> Modules linked in:
> Dumping ftrace buffer:
> (ftrace buffer empty)
> ---[ end trace 39bb45a4a4cd76d5 ]---
> RIP: 0010:__block_write_begin_int+0xde/0xae0 fs/buffer.c:1973
> Code: 00 00 0f 87 65 06 00 00 e8 df bd d6 ff 45 85 e4 0f 85 5e 06 00
> 00 e8 d1 bd d6 ff 48 8b 45 18 31 d2 48 89 ef 41 bc 0c 00 00 00 <48> 8b
> 00 48 89 c6 48 89 44 24 20 e8 02 a4 ff ff 4c 8b 7d 20 48 8b
> RSP: 0018:ffffc9000ab13980 EFLAGS: 00010246
> RAX: dead000000000200 RBX: ffffea0004568000 RCX: ffffc900025b9000
> RDX: 0000000000000000 RSI: ffffffff8160d34f RDI: ffffea0004568040
> RBP: ffffea0004568040 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000c
> R13: ffffc9000ab13aa0 R14: ffffffff821f8f70 R15: 0000000000000000
> FS: 00007f39bbe26700(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f81b40af020 CR3: 000000010b767000 CR4: 0000000000750ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554
> ----------------
> Code disassembly (best guess):
> 0: 00 00 add %al,(%rax)
> 2: 0f 87 65 06 00 00 ja 0x66d
> 8: e8 df bd d6 ff callq 0xffd6bdec
> d: 45 85 e4 test %r12d,%r12d
> 10: 0f 85 5e 06 00 00 jne 0x674
> 16: e8 d1 bd d6 ff callq 0xffd6bdec
> 1b: 48 8b 45 18 mov 0x18(%rbp),%rax
> 1f: 31 d2 xor %edx,%edx
> 21: 48 89 ef mov %rbp,%rdi
> 24: 41 bc 0c 00 00 00 mov $0xc,%r12d
> * 2a: 48 8b 00 mov (%rax),%rax <-- trapping instruction
> 2d: 48 89 c6 mov %rax,%rsi
> 30: 48 89 44 24 20 mov %rax,0x20(%rsp)
> 35: e8 02 a4 ff ff callq 0xffffa43c
> 3a: 4c 8b 7d 20 mov 0x20(%rbp),%r15
> 3e: 48 rex.W
> 3f: 8b .byte 0x8b
Hi,
This issue can still be triggered repeatedly on the latest kernel.
HEAD commit: 64570fbc14f8 Linux 5.15-rc5
git tree: upstream
kernel config: https://drive.google.com/file/d/1em3xgUIMNN_-LUUdySzwN-UDPc3qiiKD/view?usp=sharing
general protection fault, probably for non-canonical address
0xfbd59c0000000040: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0xdead000000000200-0xdead000000000207]
CPU: 2 PID: 14120 Comm: syz-executor Not tainted 5.15.0-rc5 #3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:__block_write_begin_int+0xd2/0x1f00 fs/buffer.c:1977
Code: 24 20 48 c1 e8 03 40 0f b6 ed 42 80 3c 20 00 0f 85 46 1b 00 00
48 b8 00 00 00 00 00 fc ff df 49 8b 5e 18 48 89 da 48 c1 ea 03 <80> 3c
02 00 0f 85 42 1d 00 00 48 8b 03 48 89 44 24 30 49 8d 46 08
RSP: 0018:ffffc900039073e0 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: dead000000000200 RCX: 0000000000040000
RDX: 1bd5a00000000040 RSI: ffff888018df8000 RDI: ffffea0000d80058
RBP: 0000000000000000 R08: ffffffff81daac78 R09: 0000000000000000
R10: 0000000000000007 R11: fffff940001b0000 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffea0000d80040 R15: 0000000000000000
FS: 00007f9c5537f700(0000) GS:ffff888063f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055792ede6d38 CR3: 00000000204a1000 CR4: 0000000000350ee0
Call Trace:
__block_write_begin fs/buffer.c:2060 [inline]
block_write_begin+0x58/0x2e0 fs/buffer.c:2120
generic_perform_write+0x1fe/0x510 mm/filemap.c:3770
__generic_file_write_iter+0x24e/0x640 mm/filemap.c:3897
blkdev_write_iter+0x2a7/0x560 block/fops.c:519
call_write_iter include/linux/fs.h:2163 [inline]
do_iter_readv_writev+0x47b/0x750 fs/read_write.c:729
do_iter_write fs/read_write.c:855 [inline]
do_iter_write+0x18b/0x700 fs/read_write.c:836
vfs_iter_write+0x70/0xa0 fs/read_write.c:896
iter_file_splice_write+0x723/0xbf0 fs/splice.c:689
do_splice_from fs/splice.c:767 [inline]
direct_splice_actor+0x110/0x180 fs/splice.c:936
splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891
do_splice_direct+0x1b3/0x280 fs/splice.c:979
do_sendfile+0xab6/0x1240 fs/read_write.c:1249
__do_sys_sendfile64 fs/read_write.c:1314 [inline]
__se_sys_sendfile64 fs/read_write.c:1300 [inline]
__x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1300
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f9c57e16c4d
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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:00007f9c5537ec58 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f9c57f3d0a0 RCX: 00007f9c57e16c4d
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f9c57e8fd80 R08: 0000000000000000 R09: 0000000000000000
R10: 00008400fffffffb R11: 0000000000000246 R12: 00007f9c57f3d0a0
R13: 00007ffdb9a5a15f R14: 00007ffdb9a5a300 R15: 00007f9c5537edc0
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace 5c2419f5104d23a1 ]---
RIP: 0010:__block_write_begin_int+0xd2/0x1f00 fs/buffer.c:1977
Code: 24 20 48 c1 e8 03 40 0f b6 ed 42 80 3c 20 00 0f 85 46 1b 00 00
48 b8 00 00 00 00 00 fc ff df 49 8b 5e 18 48 89 da 48 c1 ea 03 <80> 3c
02 00 0f 85 42 1d 00 00 48 8b 03 48 89 44 24 30 49 8d 46 08
RSP: 0018:ffffc900039073e0 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: dead000000000200 RCX: 0000000000040000
RDX: 1bd5a00000000040 RSI: ffff888018df8000 RDI: ffffea0000d80058
RBP: 0000000000000000 R08: ffffffff81daac78 R09: 0000000000000000
R10: 0000000000000007 R11: fffff940001b0000 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffea0000d80040 R15: 0000000000000000
FS: 00007f9c5537f700(0000) GS:ffff888063f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055792ede6d38 CR3: 00000000204a1000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess):
0: 24 20 and $0x20,%al
2: 48 c1 e8 03 shr $0x3,%rax
6: 40 0f b6 ed movzbl %bpl,%ebp
a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
f: 0f 85 46 1b 00 00 jne 0x1b5b
15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1c: fc ff df
1f: 49 8b 5e 18 mov 0x18(%r14),%rbx
23: 48 89 da mov %rbx,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 42 1d 00 00 jne 0x1d76
34: 48 8b 03 mov (%rbx),%rax
37: 48 89 44 24 30 mov %rax,0x30(%rsp)
3c: 49 8d 46 08 lea 0x8(%r14),%rax
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