Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - btrfs启动 fiemap 前在共享模式中锁定 inode 目前 fiemap 未取得 inode 的锁定VFS 锁定而仅锁定 inode io 树中的文件范围。但是如果文件上有并发 fsync并且 fiemap 代码在通过 fiemap_fill_next_extent() 访问用户空间缓冲区时触发错误这可导致死锁。死锁发生在 inode 的 i_mmap_lock 信号量上该信号量由 fsync 和 btrfs_page_mkwrite() 占用。此死锁最近由 syzbot 报告并触发如下所示的跟踪 task:syz-executor361 state:D stack:20264 pid:5668 ppid:5119 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:5293 [inline] __schedule+0x995/0xe20 kernel/sched/core.c:6606 schedule+0xcb/0x190 kernel/sched/core.c:6682 wait_on_state fs/btrfs/extent-io-tree.c:707 [inline] wait_extent_bit+ 0x577/0x6f0 fs/btrfs/extent-io-tree.c:751 lock_extent+0x1c2/0x280 fs/btrfs/extent-io-tree.c:1742 find_lock_delalloc_range+0x4e6/0x9c0 fs/btrfs/extent_io.c:488 writepage_delalloc+ 0x1ef/0x540 fs/btrfs/extent_io.c:1863 __extent_writepage+0x736/0x14e0 fs/btrfs/extent_io.c:2174 extent_write_cache_pages+0x983/0x1220 fs/btrfs/extent_io.c:3091 extent_writepages+0x219/0x540 fsext_iotrfsextent .c:3211 do_writepages+0x3c3/0x680 mm/page-writeback.c:2581 filemap_fdatawrite_wbc+0x11e/0x170 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [内联] filemap_fdatawrite_range+0x175/0x200 mm/filemap。 c:439 btrfs_ fdatawrite_range fs/btrfs/file.c:3850 [内联] start_ordered_ops fs/btrfs/file.c:1737 [内联] btrfs_sync_file+0x4ff/0x1190 fs/btrfs/file.c:1839 generic_write_sync include/linux/fs.h:2885 [inline] btrfs_do_write_iter+0xcd3/0x1280 fs/btrfs/file.c:1684 call_write_iter include/linux/fs.h:2189 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7dc/0xc50 fs/read_write。 c:584 ksys_write+0x177/0x2a0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [内联] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/ 0xcd RIP0033:0x7f7d4054e9b9 RSP: 002b:00007f7d404fa2f8 EFLAGS
    00000246 ORIG_RAX0000000000000001 RAXffffffffffffffda RBX00007f7d405d87a0 RCX00007f7d4054e9b9 RDX
    0000000000000090 RSI: 0000000020000000 RDI: 0000000000000006 RBP: 00007f7d405a51d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 61635f65646f6e69 R13:
    65646f7475616f6e R147261637369646f6e R1500007f7d405d87a8 </TASK> INFO任务 syz-executor361:5697 阻断超过 145 秒。未受感染 6.2.0-rc3-syzkaller-00376-g7c6984405241 #0 echo 0 > /proc/sys/kernel/hung_task_timeout_secs 禁用此消息。 task:syz-executor361 state:D stack:21216 pid:5697 ppid:5119 flags:0x00004004 调用跟踪 <TASK> context_switch kernel/sched/core.c:5293 [inline]
    __schedule+0x995/0xe20 kernel/sched/core.c:6606 schedule+0xcb/0x190 kernel/sched/core.c:6682 rwsem_down_read_slowpath+0x5f9/0x930 kernel/locking/rwsem.c:1095 __down_read_common+0x54/0x2a0 kernel/locking /rwsem.c:1260 btrfs_page_mkwrite+0x417/0xc80 fs/btrfs/inode.c:8526 do_page_mkwrite+0x19e/0x5e0 mm/memory.c:2947 wp_page_shared+0x15e/0x380 mm/memory.c:3295 handle_pte_fault mm/memory.c :4949 [inline] __handle_mm_fault mm/memory.c:5073 [inline] handle_mm_fault+0x1b79/0x26b0 mm/memory.c:5219 do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1428 handle_page_fault arch/x86/mm /fault.c:1519 [内联] exc_page_fault+0x7a/0x110 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:copy_user_short_string+0xd /0x40 arch/x86/lib/copy_user_64.S:233 代码 74 0a 89 (...) RSP: 0018:ffffc9000570f330 EFLAGS: 000502
    ---truncated--- (CVE-2023-52737)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

检测

Linux Distros 未修补的漏洞：CVE-2023-52737

medium Nessus 插件 ID 227420

版本 1.21