| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-21803: LoongArch: Fix warnings during S3 suspend |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| LoongArch: Fix warnings during S3 suspend |
| |
| The enable_gpe_wakeup() function calls acpi_enable_all_wakeup_gpes(), |
| and the later one may call the preempt_schedule_common() function, |
| resulting in a thread switch and causing the CPU to be in an interrupt |
| enabled state after the enable_gpe_wakeup() function returns, leading |
| to the warnings as follow. |
| |
| [ C0] WARNING: ... at kernel/time/timekeeping.c:845 ktime_get+0xbc/0xc8 |
| [ C0] ... |
| [ C0] Call Trace: |
| [ C0] [<90000000002243b4>] show_stack+0x64/0x188 |
| [ C0] [<900000000164673c>] dump_stack_lvl+0x60/0x88 |
| [ C0] [<90000000002687e4>] __warn+0x8c/0x148 |
| [ C0] [<90000000015e9978>] report_bug+0x1c0/0x2b0 |
| [ C0] [<90000000016478e4>] do_bp+0x204/0x3b8 |
| [ C0] [<90000000025b1924>] exception_handlers+0x1924/0x10000 |
| [ C0] [<9000000000343bbc>] ktime_get+0xbc/0xc8 |
| [ C0] [<9000000000354c08>] tick_sched_timer+0x30/0xb0 |
| [ C0] [<90000000003408e0>] __hrtimer_run_queues+0x160/0x378 |
| [ C0] [<9000000000341f14>] hrtimer_interrupt+0x144/0x388 |
| [ C0] [<9000000000228348>] constant_timer_interrupt+0x38/0x48 |
| [ C0] [<90000000002feba4>] __handle_irq_event_percpu+0x64/0x1e8 |
| [ C0] [<90000000002fed48>] handle_irq_event_percpu+0x20/0x80 |
| [ C0] [<9000000000306b9c>] handle_percpu_irq+0x5c/0x98 |
| [ C0] [<90000000002fd4a0>] generic_handle_domain_irq+0x30/0x48 |
| [ C0] [<9000000000d0c7b0>] handle_cpu_irq+0x70/0xa8 |
| [ C0] [<9000000001646b30>] handle_loongarch_irq+0x30/0x48 |
| [ C0] [<9000000001646bc8>] do_vint+0x80/0xe0 |
| [ C0] [<90000000002aea1c>] finish_task_switch.isra.0+0x8c/0x2a8 |
| [ C0] [<900000000164e34c>] __schedule+0x314/0xa48 |
| [ C0] [<900000000164ead8>] schedule+0x58/0xf0 |
| [ C0] [<9000000000294a2c>] worker_thread+0x224/0x498 |
| [ C0] [<900000000029d2f0>] kthread+0xf8/0x108 |
| [ C0] [<9000000000221f28>] ret_from_kernel_thread+0xc/0xa4 |
| [ C0] |
| [ C0] ---[ end trace 0000000000000000 ]--- |
| |
| The root cause is acpi_enable_all_wakeup_gpes() uses a mutex to protect |
| acpi_hw_enable_all_wakeup_gpes(), and acpi_ut_acquire_mutex() may cause |
| a thread switch. Since there is no longer concurrent execution during |
| loongarch_acpi_suspend(), we can call acpi_hw_enable_all_wakeup_gpes() |
| directly in enable_gpe_wakeup(). |
| |
| The solution is similar to commit 22db06337f590d01 ("ACPI: sleep: Avoid |
| breaking S3 wakeup due to might_sleep()"). |
| |
| The Linux kernel CVE team has assigned CVE-2025-21803 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.2 with commit 366bb35a8e48198cefcd3484ac6b2374d1347873 and fixed in 6.6.76 with commit d49ab6857d98266010f3446c9c2063014db5b654 |
| Issue introduced in 6.2 with commit 366bb35a8e48198cefcd3484ac6b2374d1347873 and fixed in 6.12.13 with commit 194d26a5a43c26dc98a9b4e2c1d521dcb84dd1bf |
| Issue introduced in 6.2 with commit 366bb35a8e48198cefcd3484ac6b2374d1347873 and fixed in 6.13.2 with commit 8682a71a7f6de7c683f31b4334b04e19685a05f9 |
| Issue introduced in 6.2 with commit 366bb35a8e48198cefcd3484ac6b2374d1347873 and fixed in 6.14 with commit 26c0a2d93af55d30a46d5f45d3e9c42cde730168 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-21803 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| arch/loongarch/power/platform.c |
| drivers/acpi/acpica/achware.h |
| include/acpi/acpixf.h |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/d49ab6857d98266010f3446c9c2063014db5b654 |
| https://git.kernel.org/stable/c/194d26a5a43c26dc98a9b4e2c1d521dcb84dd1bf |
| https://git.kernel.org/stable/c/8682a71a7f6de7c683f31b4334b04e19685a05f9 |
| https://git.kernel.org/stable/c/26c0a2d93af55d30a46d5f45d3e9c42cde730168 |
