发布于3月6日3月6日 Members Red Hat: CVE-2023-52791: kernel: i2c: core: Run atomic i2c xfer when !preemptible (Multiple Advisories) Severity 4 CVSS (AV:L/AC:L/Au:M/C:N/I:N/A:C) Published 05/21/2024 Created 08/13/2024 Added 08/12/2024 Modified 12/05/2024 Description In the Linux kernel, the following vulnerability has been resolved: i2c: core: Run atomic i2c xfer when !preemptible Since bae1d3a05a8b, i2c transfers are non-atomic if preemption is disabled. However, non-atomic i2c transfers require preemption (e.g. in wait_for_completion() while waiting for the DMA). panic() calls preempt_disable_notrace() before calling emergency_restart(). Therefore, if an i2c device is used for the restart, the xfer should be atomic. This avoids warnings like: [ 12.667612] WARNING: CPU: 1 PID: 1 at kernel/rcu/tree_plugin.h:318 rcu_note_context_switch+0x33c/0x6b0 [ 12.676926] Voluntary context switch within RCU read-side critical section! ... [ 12.742376]schedule_timeout from wait_for_completion_timeout+0x90/0x114 [ 12.749179]wait_for_completion_timeout from tegra_i2c_wait_completion+0x40/0x70 ... [ 12.994527]atomic_notifier_call_chain from machine_restart+0x34/0x58 [ 13.001050]machine_restart from panic+0x2a8/0x32c Use !preemptible() instead, which is basically the same check as pre-v5.2. Solution(s) redhat-upgrade-kernel redhat-upgrade-kernel-rt References CVE-2023-52791 RHSA-2024:5101 RHSA-2024:5102 RHSA-2024:9315
