| 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-2024-42253: gpio: pca953x: fix pca953x_irq_bus_sync_unlock race |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| gpio: pca953x: fix pca953x_irq_bus_sync_unlock race |
| |
| Ensure that `i2c_lock' is held when setting interrupt latch and mask in |
| pca953x_irq_bus_sync_unlock() in order to avoid races. |
| |
| The other (non-probe) call site pca953x_gpio_set_multiple() ensures the |
| lock is held before calling pca953x_write_regs(). |
| |
| The problem occurred when a request raced against irq_bus_sync_unlock() |
| approximately once per thousand reboots on an i.MX8MP based system. |
| |
| * Normal case |
| |
| 0-0022: write register AI|3a {03,02,00,00,01} Input latch P0 |
| 0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0 |
| 0-0022: write register AI|08 {ff,00,00,00,00} Output P3 |
| 0-0022: write register AI|12 {fc,00,00,00,00} Config P3 |
| |
| * Race case |
| |
| 0-0022: write register AI|08 {ff,00,00,00,00} Output P3 |
| 0-0022: write register AI|08 {03,02,00,00,01} *** Wrong register *** |
| 0-0022: write register AI|12 {fc,00,00,00,00} Config P3 |
| 0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0 |
| |
| The Linux kernel CVE team has assigned CVE-2024-42253 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.1.101 with commit 58a5c93bd1a6e949267400080f07e57ffe05ec34 |
| Fixed in 6.6.42 with commit e2ecdddca80dd845df42376e4b0197fe97018ba2 |
| Fixed in 6.9.11 with commit de7cffa53149c7b48bd1bb29b02390c9f05b7f41 |
| Fixed in 6.10 with commit bfc6444b57dc7186b6acc964705d7516cbaf3904 |
| |
| 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-2024-42253 |
| 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/gpio/gpio-pca953x.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/58a5c93bd1a6e949267400080f07e57ffe05ec34 |
| https://git.kernel.org/stable/c/e2ecdddca80dd845df42376e4b0197fe97018ba2 |
| https://git.kernel.org/stable/c/de7cffa53149c7b48bd1bb29b02390c9f05b7f41 |
| https://git.kernel.org/stable/c/bfc6444b57dc7186b6acc964705d7516cbaf3904 |
