Message-ID: <0858d100-27f7-4068-8b18-710b03d0cca2.bugreport@ubisectech.com>
Date: Thu, 09 May 2024 08:53:52 +0800
From: "Ubisectech Sirius" <bugreport@...sectech.com>
To: "linux-trace-kernel" <linux-trace-kernel@...r.kernel.org>,
  "linux-kernel" <linux-kernel@...r.kernel.org>
Cc: "kent.overstreet" <kent.overstreet@...ux.dev>
Subject: kernel BUG in bch2_bkey_durability_safe

Hello.
We are Ubisectech Sirius Team, the vulnerability lab of China ValiantSec. Recently, our team has discovered a issue in Linux kernel 6.7. Attached to the email were a PoC file of the issue.

Stack dump:

bcachefs (loop0): mounting version 1.7: (unknown version) opts=metadata_checksum=none,data_checksum=none,nojournal_transaction_names
------------[ cut here ]------------
kernel BUG at fs/bcachefs/extents.h:57!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 1 PID: 9806 Comm: syz-executor.0 Not tainted 6.7.0 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:extent_entry_type fs/bcachefs/extents.h:57 [inline]
RIP: 0010:extent_entry_type fs/bcachefs/extents.h:53 [inline]
RIP: 0010:bch2_bkey_durability_safe+0x3f3/0x4d0 fs/bcachefs/extents.c:699
Code: 8b 7c 24 10 e8 de 8b ff ff 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 0f 85 a9 00 00 00 49 8b 1c 24 e9 0f ff ff ff e8 fe 84 bc fd 90 <0f> 0b e8 f6 84 bc fd 90 0f 0b e8 ee 84 bc fd 90 0f 0b e8 e6 84 bc
RSP: 0018:ffffc900036d6b40 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000020040 RCX: ffffc90001ef9000
RDX: 0000000000040000 RSI: ffffffff83cd7152 RDI: 0000000000000005
RBP: ffffc900036d6c68 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000006 R11: ffffffff81e082d5 R12: ffff88805abfe5b8
R13: 0000000000000006 R14: dffffc0000000000 R15: ffffc900036d6fa0
FS:  00007f10d2578640(0000) GS:ffff88807ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fddba11f3d0 CR3: 000000004498c000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 <TASK>
 bch2_bkey_ptrs_to_text+0xeb/0x1760 fs/bcachefs/extents.c:985
 bch2_btree_ptr_v2_to_text+0x288/0x330 fs/bcachefs/extents.c:215
 bch2_val_to_text fs/bcachefs/bkey_methods.c:287 [inline]
 bch2_bkey_val_to_text+0x1c8/0x210 fs/bcachefs/bkey_methods.c:297
 journal_validate_key+0x7ab/0xb50 fs/bcachefs/journal_io.c:322
 journal_entry_btree_root_validate+0x31c/0x380 fs/bcachefs/journal_io.c:411
 bch2_journal_entry_validate+0xc7/0x130 fs/bcachefs/journal_io.c:752
 bch2_sb_clean_validate_late+0x14b/0x1e0 fs/bcachefs/sb-clean.c:32
 bch2_read_superblock_clean+0xbb/0x250 fs/bcachefs/sb-clean.c:160
 bch2_fs_recovery+0x113/0x52d0 fs/bcachefs/recovery.c:691
 bch2_fs_start+0x365/0x5e0 fs/bcachefs/super.c:978
 bch2_fs_open+0x1ac9/0x3890 fs/bcachefs/super.c:1968
 bch2_mount+0x538/0x13c0 fs/bcachefs/fs.c:1863
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x93/0x380 fs/super.c:1771
 do_new_mount fs/namespace.c:3337 [inline]
 path_mount+0x679/0x1e40 fs/namespace.c:3664
 do_mount fs/namespace.c:3677 [inline]
 __do_sys_mount fs/namespace.c:3886 [inline]
 __se_sys_mount fs/namespace.c:3863 [inline]
 __x64_sys_mount+0x287/0x310 fs/namespace.c:3863
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x43/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f10d1891b3e
Code: 48 c7 c0 ff ff ff ff eb aa e8 be 0d 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f10d2577e38 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000011a03 RCX: 00007f10d1891b3e
RDX: 0000000020011a00 RSI: 0000000020000080 RDI: 00007f10d2577e90
RBP: 00007f10d2577ed0 R08: 00007f10d2577ed0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020011a00
R13: 0000000020000080 R14: 00007f10d2577e90 R15: 0000000020011a80
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:extent_entry_type fs/bcachefs/extents.h:57 [inline]
RIP: 0010:extent_entry_type fs/bcachefs/extents.h:53 [inline]
RIP: 0010:bch2_bkey_durability_safe+0x3f3/0x4d0 fs/bcachefs/extents.c:699
Code: 8b 7c 24 10 e8 de 8b ff ff 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 0f 85 a9 00 00 00 49 8b 1c 24 e9 0f ff ff ff e8 fe 84 bc fd 90 <0f> 0b e8 f6 84 bc fd 90 0f 0b e8 ee 84 bc fd 90 0f 0b e8 e6 84 bc
RSP: 0018:ffffc900036d6b40 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000020040 RCX: ffffc90001ef9000
RDX: 0000000000040000 RSI: ffffffff83cd7152 RDI: 0000000000000005
RBP: ffffc900036d6c68 R08: 0000000000000005 R09: 0000000000000005
R10: 0000000000000006 R11: ffffffff81e082d5 R12: ffff88805abfe5b8
R13: 0000000000000006 R14: dffffc0000000000 R15: ffffc900036d6fa0
FS:  00007f10d2578640(0000) GS:ffff88802c600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a00045038 CR3: 000000004498c000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554


Thank you for taking the time to read this email and we look forward to working with you further.










Download attachment "poc.c" of type "application/octet-stream" (340012 bytes)

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