CVE-2025-71117

Description

In the Linux kernel, the following vulnerability has been resolved:block: Remove queue freezing from several sysfs store callbacksFreezing the request queue from inside sysfs store callbacks may cause adeadlock in combination with the dm-multipath driver and thequeue_if_no_path option. Additionally, freezing the request queue slowsdown system boot on systems where sysfs attributes are set synchronously.Fix this by removing the blk_mq_freeze_queue() / blk_mq_unfreeze_queue()calls from the store callbacks that do not strictly need these callbacks.Add the __data_racy annotation to request_queue.rq_timeout to suppressKCSAN data race reports about the rq_timeout reads.This patch may cause a small delay in applying the new settings.For all the attributes affected by this patch, I/O will completecorrectly whether the old or the new value of the attribute is used.This patch affects the following sysfs attributes:* io_poll_delay* io_timeout* nomerges* read_ahead_kb* rq_affinityHere is an example of a deadlock triggered by running test srp/002if this patch is not applied:task:multipathdCall Trace: __schedule+0x8c1/0x1bf0 schedule+0xdd/0x270 schedule_preempt_disabled+0x1c/0x30 __mutex_lock+0xb89/0x1650 mutex_lock_nested+0x1f/0x30 dm_table_set_restrictions+0x823/0xdf0 __bind+0x166/0x590 dm_swap_table+0x2a7/0x490 do_resume+0x1b1/0x610 dev_suspend+0x55/0x1a0 ctl_ioctl+0x3a5/0x7e0 dm_ctl_ioctl+0x12/0x20 __x64_sys_ioctl+0x127/0x1a0 x64_sys_call+0xe2b/0x17d0 do_syscall_64+0x96/0x3a0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 task:(udev-worker)Call Trace: __schedule+0x8c1/0x1bf0 schedule+0xdd/0x270 blk_mq_freeze_queue_wait+0xf2/0x140 blk_mq_freeze_queue_nomemsave+0x23/0x30 queue_ra_store+0x14e/0x290 queue_attr_store+0x23e/0x2c0 sysfs_kf_write+0xde/0x140 kernfs_fop_write_iter+0x3b2/0x630 vfs_write+0x4fd/0x1390 ksys_write+0xfd/0x230 __x64_sys_write+0x76/0xc0 x64_sys_call+0x276/0x17d0 do_syscall_64+0x96/0x3a0 entry_SYSCALL_64_after_hwframe+0x4b/0x53

Risk Information

Associated Vulnerability

Patch Details

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234