linux-kernel - kernel BUG in ptr

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Message-ID: <c9f0326b-c90f-4764-ae1a-cefc50726283.bugreport@ubisectech.com>
Date: Thu, 09 May 2024 14:26:24 +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 ptr_stale

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 (loop1): mounting version 1.7: (unknown version) opts=metadata_checksum=none,data_checksum=none,nojournal_transaction_names
------------[ cut here ]------------
kernel BUG at fs/bcachefs/buckets.h:114!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 1 PID: 9472 Comm: syz-executor.1 Not tainted 6.7.0 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:bucket_gen fs/bcachefs/buckets.h:114 [inline]
RIP: 0010:ptr_stale+0x474/0x4e0 fs/bcachefs/buckets.h:188
Code: 48 c7 c2 80 8c 1b 8b be 67 00 00 00 48 c7 c7 e0 8c 1b 8b c6 05 ea a6 72 0b 01 e8 57 55 9c fd e9 fb fc ff ff e8 9d 02 bd fd 90 <0f> 0b 48 89 04 24 e8 31 bb 13 fe 48 8b 04 24 e9 35 fc ff ff e8 23
RSP: 0018:ffffc90007c4ec38 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000080 RCX: ffffc90002679000
RDX: 0000000000040000 RSI: ffffffff83ccf3b3 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000010000028
R10: 0000000000000080 R11: 0000000000000000 R12: 0000000010000028
R13: ffff88804dee5100 R14: 0000000000000000 R15: ffff88805b1a4110
FS:  00007f79ba8ab640(0000) GS:ffff88807ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0bbda3f000 CR3: 000000005f37a000 CR4: 0000000000750ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 <TASK>
 bch2_bkey_ptrs_to_text+0xb4e/0x1760 fs/bcachefs/extents.c:1012
 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: 0033:0x7f79b9a91b3e
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:00007f79ba8aae38 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000000119f4 RCX: 00007f79b9a91b3e
RDX: 0000000020011a00 RSI: 0000000020011a40 RDI: 00007f79ba8aae90
RBP: 00007f79ba8aaed0 R08: 00007f79ba8aaed0 R09: 000000000181c050
R10: 000000000181c050 R11: 0000000000000202 R12: 0000000020011a00
R13: 0000000020011a40 R14: 00007f79ba8aae90 R15: 00000000200001c0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---


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







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