CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2024-27007 – userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE
https://notcve.org/view.php?id=CVE-2024-27007
In the Linux kernel, the following vulnerability has been resolved: userfaultfd: change src_folio after ensuring it's unpinned in UFFDIO_MOVE Commit d7a08838ab74 ("mm: userfaultfd: fix unexpected change to src_folio when UFFDIO_MOVE fails") moved the src_folio->{mapping, index} changing to after clearing the page-table and ensuring that it's not pinned. This avoids failure of swapout+migration and possibly memory corruption. However, the commit missed fixing it in the huge-page case. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: userfaultfd: cambie src_folio después de asegurarse de que no esté fijado en UFFDIO_MOVE Commit d7a08838ab74 ("mm: userfaultfd: corrija el cambio inesperado en src_folio cuando UFFDIO_MOVE falla") movió src_folio->{mapping, index} cambiando a después de borrar la tabla de páginas y asegurarse de que no esté fijada. Esto evita fallos en el intercambio+migración y posiblemente daños en la memoria. Sin embargo, la confirmación no solucionó el problema en el caso de la página enorme. • https://git.kernel.org/stable/c/adef440691bab824e39c1b17382322d195e1fab0 https://git.kernel.org/stable/c/df5f6e683e7f21a15d8be6e7a0c7a46436963ebe https://git.kernel.org/stable/c/c0205eaf3af9f5db14d4b5ee4abacf4a583c3c50 •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2024-27006 – thermal/debugfs: Add missing count increment to thermal_debug_tz_trip_up()
https://notcve.org/view.php?id=CVE-2024-27006
In the Linux kernel, the following vulnerability has been resolved: thermal/debugfs: Add missing count increment to thermal_debug_tz_trip_up() The count field in struct trip_stats, representing the number of times the zone temperature was above the trip point, needs to be incremented in thermal_debug_tz_trip_up(), for two reasons. First, if a trip point is crossed on the way up for the first time, thermal_debug_update_temp() called from update_temperature() does not see it because it has not been added to trips_crossed[] array in the thermal zone's struct tz_debugfs object yet. Therefore, when thermal_debug_tz_trip_up() is called after that, the trip point's count value is 0, and the attempt to divide by it during the average temperature computation leads to a divide error which causes the kernel to crash. Setting the count to 1 before the division by incrementing it fixes this problem. Second, if a trip point is crossed on the way up, but it has been crossed on the way up already before, its count value needs to be incremented to make a record of the fact that the zone temperature is above the trip now. Without doing that, if the mitigations applied after crossing the trip cause the zone temperature to drop below its threshold, the count will not be updated for this episode at all and the average temperature in the trip statistics record will be somewhat higher than it should be. Cc :6.8+ <stable@vger.kernel.org> # 6.8+ En el kernel de Linux, se resolvió la siguiente vulnerabilidad: Thermal/debugfs: agregue el incremento de conteo faltante a Thermal_debug_tz_trip_up() El campo de conteo en la estructura trip_stats, que representa la cantidad de veces que la temperatura de la zona estuvo por encima del punto de disparo, debe incrementarse en Thermal_debug_tz_trip_up(), por dos razones. Primero, si se cruza un punto de viaje en el camino hacia arriba por primera vez, Thermal_debug_update_temp() llamado desde update_temperature() no lo ve porque aún no se ha agregado a la matriz trips_crossed[] en el objeto struct tz_debugfs de la zona térmica. • https://git.kernel.org/stable/c/7ef01f228c9f54c6260319858be138a8a7e9e704 https://git.kernel.org/stable/c/9c8215d32e730b597c809a9d2090bf8ec1b79fcf https://git.kernel.org/stable/c/b552f63cd43735048bbe9bfbb7a9dcfce166fbdd •
CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2024-27005 – interconnect: Don't access req_list while it's being manipulated
https://notcve.org/view.php?id=CVE-2024-27005
In the Linux kernel, the following vulnerability has been resolved: interconnect: Don't access req_list while it's being manipulated The icc_lock mutex was split into separate icc_lock and icc_bw_lock mutexes in [1] to avoid lockdep splats. However, this didn't adequately protect access to icc_node::req_list. The icc_set_bw() function will eventually iterate over req_list while only holding icc_bw_lock, but req_list can be modified while only holding icc_lock. This causes races between icc_set_bw(), of_icc_get(), and icc_put(). Example A: CPU0 CPU1 ---- ---- icc_set_bw(path_a) mutex_lock(&icc_bw_lock); icc_put(path_b) mutex_lock(&icc_lock); aggregate_requests() hlist_for_each_entry(r, ... hlist_del(... <r = invalid pointer> Example B: CPU0 CPU1 ---- ---- icc_set_bw(path_a) mutex_lock(&icc_bw_lock); path_b = of_icc_get() of_icc_get_by_index() mutex_lock(&icc_lock); path_find() path_init() aggregate_requests() hlist_for_each_entry(r, ... hlist_add_head(... <r = invalid pointer> Fix this by ensuring icc_bw_lock is always held before manipulating icc_node::req_list. The additional places icc_bw_lock is held don't perform any memory allocations, so we should still be safe from the original lockdep splats that motivated the separate locks. [1] commit af42269c3523 ("interconnect: Fix locking for runpm vs reclaim") En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: interconexión: no acceder a req_list mientras se está manipulando. El mutex icc_lock se dividió en mutex icc_lock e icc_bw_lock separados en [1] para evitar símbolos de bloqueo. • https://git.kernel.org/stable/c/af42269c3523492d71ebbe11fefae2653e9cdc78 https://git.kernel.org/stable/c/9be2957f014d91088db1eb5dd09d9a03d7184dce https://git.kernel.org/stable/c/fe549d8e976300d0dd75bd904eb216bed8b145e0 https://git.kernel.org/stable/c/ee42bfc791aa3cd78e29046f26a09d189beb3efb https://git.kernel.org/stable/c/19ec82b3cad1abef2a929262b8c1528f4e0c192d https://git.kernel.org/stable/c/2f3a124696d43de3c837f87a9f767c56ee86cf2a https://git.kernel.org/stable/c/d0d04efa2e367921654b5106cc5c05e3757c2b42 https://git.kernel.org/stable/c/4c65507121ea8e0b47fae6d2049c86883 •
CVSS: -EPSS: 0%CPEs: 7EXPL: 0CVE-2024-27004 – clk: Get runtime PM before walking tree during disable_unused
https://notcve.org/view.php?id=CVE-2024-27004
In the Linux kernel, the following vulnerability has been resolved: clk: Get runtime PM before walking tree during disable_unused Doug reported [1] the following hung task: INFO: task swapper/0:1 blocked for more than 122 seconds. Not tainted 5.15.149-21875-gf795ebc40eb8 #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:swapper/0 state:D stack: 0 pid: 1 ppid: 0 flags:0x00000008 Call trace: __switch_to+0xf4/0x1f4 __schedule+0x418/0xb80 schedule+0x5c/0x10c rpm_resume+0xe0/0x52c rpm_resume+0x178/0x52c __pm_runtime_resume+0x58/0x98 clk_pm_runtime_get+0x30/0xb0 clk_disable_unused_subtree+0x58/0x208 clk_disable_unused_subtree+0x38/0x208 clk_disable_unused_subtree+0x38/0x208 clk_disable_unused_subtree+0x38/0x208 clk_disable_unused_subtree+0x38/0x208 clk_disable_unused+0x4c/0xe4 do_one_initcall+0xcc/0x2d8 do_initcall_level+0xa4/0x148 do_initcalls+0x5c/0x9c do_basic_setup+0x24/0x30 kernel_init_freeable+0xec/0x164 kernel_init+0x28/0x120 ret_from_fork+0x10/0x20 INFO: task kworker/u16:0:9 blocked for more than 122 seconds. Not tainted 5.15.149-21875-gf795ebc40eb8 #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u16:0 state:D stack: 0 pid: 9 ppid: 2 flags:0x00000008 Workqueue: events_unbound deferred_probe_work_func Call trace: __switch_to+0xf4/0x1f4 __schedule+0x418/0xb80 schedule+0x5c/0x10c schedule_preempt_disabled+0x2c/0x48 __mutex_lock+0x238/0x488 __mutex_lock_slowpath+0x1c/0x28 mutex_lock+0x50/0x74 clk_prepare_lock+0x7c/0x9c clk_core_prepare_lock+0x20/0x44 clk_prepare+0x24/0x30 clk_bulk_prepare+0x40/0xb0 mdss_runtime_resume+0x54/0x1c8 pm_generic_runtime_resume+0x30/0x44 __genpd_runtime_resume+0x68/0x7c genpd_runtime_resume+0x108/0x1f4 __rpm_callback+0x84/0x144 rpm_callback+0x30/0x88 rpm_resume+0x1f4/0x52c rpm_resume+0x178/0x52c __pm_runtime_resume+0x58/0x98 __device_attach+0xe0/0x170 device_initial_probe+0x1c/0x28 bus_probe_device+0x3c/0x9c device_add+0x644/0x814 mipi_dsi_device_register_full+0xe4/0x170 devm_mipi_dsi_device_register_full+0x28/0x70 ti_sn_bridge_probe+0x1dc/0x2c0 auxiliary_bus_probe+0x4c/0x94 really_probe+0xcc/0x2c8 __driver_probe_device+0xa8/0x130 driver_probe_device+0x48/0x110 __device_attach_driver+0xa4/0xcc bus_for_each_drv+0x8c/0xd8 __device_attach+0xf8/0x170 device_initial_probe+0x1c/0x28 bus_probe_device+0x3c/0x9c deferred_probe_work_func+0x9c/0xd8 process_one_work+0x148/0x518 worker_thread+0x138/0x350 kthread+0x138/0x1e0 ret_from_fork+0x10/0x20 The first thread is walking the clk tree and calling clk_pm_runtime_get() to power on devices required to read the clk hardware via struct clk_ops::is_enabled(). This thread holds the clk prepare_lock, and is trying to runtime PM resume a device, when it finds that the device is in the process of resuming so the thread schedule()s away waiting for the device to finish resuming before continuing. The second thread is runtime PM resuming the same device, but the runtime resume callback is calling clk_prepare(), trying to grab the prepare_lock waiting on the first thread. This is a classic ABBA deadlock. To properly fix the deadlock, we must never runtime PM resume or suspend a device with the clk prepare_lock held. Actually doing that is near impossible today because the global prepare_lock would have to be dropped in the middle of the tree, the device runtime PM resumed/suspended, and then the prepare_lock grabbed again to ensure consistency of the clk tree topology. • https://git.kernel.org/stable/c/9a34b45397e5a389e25a0c5d39983300d040e5e2 https://git.kernel.org/stable/c/253ab38d1ee652a596942156978a233970d185ba https://git.kernel.org/stable/c/4af115f1a20a3d9093586079206ee37c2ac55123 https://git.kernel.org/stable/c/a29ec0465dce0b871003698698ac6fa92c9a5034 https://git.kernel.org/stable/c/a424e713e0cc33d4b969cfda25b9f46df4d7b5bc https://git.kernel.org/stable/c/60ff482c4205a5aac3b0595ab794cfd62295dab5 https://git.kernel.org/stable/c/115554862294397590088ba02f11f2aba6d5016c https://git.kernel.org/stable/c/e581cf5d216289ef292d1a4036d53ce90 •
CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2024-27003 – clk: Get runtime PM before walking tree for clk_summary
https://notcve.org/view.php?id=CVE-2024-27003
In the Linux kernel, the following vulnerability has been resolved: clk: Get runtime PM before walking tree for clk_summary Similar to the previous commit, we should make sure that all devices are runtime resumed before printing the clk_summary through debugfs. Failure to do so would result in a deadlock if the thread is resuming a device to print clk state and that device is also runtime resuming in another thread, e.g the screen is turning on and the display driver is starting up. We remove the calls to clk_pm_runtime_{get,put}() in this path because they're superfluous now that we know the devices are runtime resumed. This also squashes a bug where the return value of clk_pm_runtime_get() wasn't checked, leading to an RPM count underflow on error paths. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: clk: Obtenga PM en tiempo de ejecución antes de recorrer el árbol para clk_summary De manera similar a el commit anterior, debemos asegurarnos de que todos los dispositivos se reanuden en tiempo de ejecución antes de imprimir clk_summary a través de debugfs. • https://git.kernel.org/stable/c/1bb294a7981c737e2311a78e4086635ac0220ace https://git.kernel.org/stable/c/83ada89e4a86e2b28ea2b5113c76d6dc7560a4d0 https://git.kernel.org/stable/c/2c077fdfd09dffb31a890e5095c8ab205138a42e https://git.kernel.org/stable/c/b457105309d388e4081c716cf7b81d517ff74db4 https://git.kernel.org/stable/c/9d1e795f754db1ac3344528b7af0b17b8146f321 •