| 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-2022-49265: PM: domains: Fix sleep-in-atomic bug caused by genpd_debug_remove() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| PM: domains: Fix sleep-in-atomic bug caused by genpd_debug_remove() |
| |
| When a genpd with GENPD_FLAG_IRQ_SAFE gets removed, the following |
| sleep-in-atomic bug will be seen, as genpd_debug_remove() will be called |
| with a spinlock being held. |
| |
| [ 0.029183] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1460 |
| [ 0.029204] in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 1, name: swapper/0 |
| [ 0.029219] preempt_count: 1, expected: 0 |
| [ 0.029230] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.17.0-rc4+ #489 |
| [ 0.029245] Hardware name: Thundercomm TurboX CM2290 (DT) |
| [ 0.029256] Call trace: |
| [ 0.029265] dump_backtrace.part.0+0xbc/0xd0 |
| [ 0.029285] show_stack+0x3c/0xa0 |
| [ 0.029298] dump_stack_lvl+0x7c/0xa0 |
| [ 0.029311] dump_stack+0x18/0x34 |
| [ 0.029323] __might_resched+0x10c/0x13c |
| [ 0.029338] __might_sleep+0x4c/0x80 |
| [ 0.029351] down_read+0x24/0xd0 |
| [ 0.029363] lookup_one_len_unlocked+0x9c/0xcc |
| [ 0.029379] lookup_positive_unlocked+0x10/0x50 |
| [ 0.029392] debugfs_lookup+0x68/0xac |
| [ 0.029406] genpd_remove.part.0+0x12c/0x1b4 |
| [ 0.029419] of_genpd_remove_last+0xa8/0xd4 |
| [ 0.029434] psci_cpuidle_domain_probe+0x174/0x53c |
| [ 0.029449] platform_probe+0x68/0xe0 |
| [ 0.029462] really_probe+0x190/0x430 |
| [ 0.029473] __driver_probe_device+0x90/0x18c |
| [ 0.029485] driver_probe_device+0x40/0xe0 |
| [ 0.029497] __driver_attach+0xf4/0x1d0 |
| [ 0.029508] bus_for_each_dev+0x70/0xd0 |
| [ 0.029523] driver_attach+0x24/0x30 |
| [ 0.029534] bus_add_driver+0x164/0x22c |
| [ 0.029545] driver_register+0x78/0x130 |
| [ 0.029556] __platform_driver_register+0x28/0x34 |
| [ 0.029569] psci_idle_init_domains+0x1c/0x28 |
| [ 0.029583] do_one_initcall+0x50/0x1b0 |
| [ 0.029595] kernel_init_freeable+0x214/0x280 |
| [ 0.029609] kernel_init+0x2c/0x13c |
| [ 0.029622] ret_from_fork+0x10/0x20 |
| |
| It doesn't seem necessary to call genpd_debug_remove() with the lock, so |
| move it out from locking to fix the problem. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49265 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.11 with commit 718072ceb211833f3c71724f49d733d636067191 and fixed in 5.15.33 with commit 2039163c30f886cf5638afd6993705ae9bb34a06 |
| Issue introduced in 5.11 with commit 718072ceb211833f3c71724f49d733d636067191 and fixed in 5.16.19 with commit d1b6840d8fb9b35193d45d8fe6b4d830bfd20c3c |
| Issue introduced in 5.11 with commit 718072ceb211833f3c71724f49d733d636067191 and fixed in 5.17.2 with commit fee777ea77769cc5392a34805d9d73099a223fae |
| Issue introduced in 5.11 with commit 718072ceb211833f3c71724f49d733d636067191 and fixed in 5.18 with commit f6bfe8b5b2c2a5ac8bd2fc7bca3706e6c3fc26d8 |
| |
| 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-2022-49265 |
| 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: |
| drivers/base/power/domain.c |
| |
| |
| 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/2039163c30f886cf5638afd6993705ae9bb34a06 |
| https://git.kernel.org/stable/c/d1b6840d8fb9b35193d45d8fe6b4d830bfd20c3c |
| https://git.kernel.org/stable/c/fee777ea77769cc5392a34805d9d73099a223fae |
| https://git.kernel.org/stable/c/f6bfe8b5b2c2a5ac8bd2fc7bca3706e6c3fc26d8 |
