| 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-2024-35920: media: mediatek: vcodec: adding lock to protect decoder context list |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| media: mediatek: vcodec: adding lock to protect decoder context list |
| |
| Add a lock for the ctx_list, to avoid accessing a NULL pointer |
| within the 'vpu_dec_ipi_handler' function when the ctx_list has |
| been deleted due to an unexpected behavior on the SCP IP block. |
| |
| Hardware name: Google juniper sku16 board (DT) |
| pstate: 20400005 (nzCv daif +PAN -UAO -TCO BTYPE=--) |
| pc : vpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec] |
| lr : scp_ipi_handler+0xd0/0x194 [mtk_scp] |
| sp : ffffffc0131dbbd0 |
| x29: ffffffc0131dbbd0 x28: 0000000000000000 |
| x27: ffffff9bb277f348 x26: ffffff9bb242ad00 |
| x25: ffffffd2d440d3b8 x24: ffffffd2a13ff1d4 |
| x23: ffffff9bb7fe85a0 x22: ffffffc0133fbdb0 |
| x21: 0000000000000010 x20: ffffff9b050ea328 |
| x19: ffffffc0131dbc08 x18: 0000000000001000 |
| x17: 0000000000000000 x16: ffffffd2d461c6e0 |
| x15: 0000000000000242 x14: 000000000000018f |
| x13: 000000000000004d x12: 0000000000000000 |
| x11: 0000000000000001 x10: fffffffffffffff0 |
| x9 : ffffff9bb6e793a8 x8 : 0000000000000000 |
| x7 : 0000000000000000 x6 : 000000000000003f |
| x5 : 0000000000000040 x4 : fffffffffffffff0 |
| x3 : 0000000000000020 x2 : ffffff9bb6e79080 |
| x1 : 0000000000000010 x0 : ffffffc0131dbc08 |
| Call trace: |
| vpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec (HASH:6c3f 2)] |
| scp_ipi_handler+0xd0/0x194 [mtk_scp (HASH:7046 3)] |
| mt8183_scp_irq_handler+0x44/0x88 [mtk_scp (HASH:7046 3)] |
| scp_irq_handler+0x48/0x90 [mtk_scp (HASH:7046 3)] |
| irq_thread_fn+0x38/0x94 |
| irq_thread+0x100/0x1c0 |
| kthread+0x140/0x1fc |
| ret_from_fork+0x10/0x30 |
| Code: 54000088 f94ca50a eb14015f 54000060 (f9400108) |
| ---[ end trace ace43ce36cbd5c93 ]--- |
| Kernel panic - not syncing: Oops: Fatal exception |
| SMP: stopping secondary CPUs |
| Kernel Offset: 0x12c4000000 from 0xffffffc010000000 |
| PHYS_OFFSET: 0xffffffe580000000 |
| CPU features: 0x08240002,2188200c |
| Memory Limit: none |
| |
| The Linux kernel CVE team has assigned CVE-2024-35920 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.6 with commit 655b86e52eacdce79c2e02c5ec7258a97fcc2e4a and fixed in 6.6.27 with commit 0a2dc707aa42214f9c4827bd57e344e29a0841d6 |
| Issue introduced in 6.6 with commit 655b86e52eacdce79c2e02c5ec7258a97fcc2e4a and fixed in 6.8.6 with commit 23aaf824121055ba81b55f75444355bd83c8eb38 |
| Issue introduced in 6.6 with commit 655b86e52eacdce79c2e02c5ec7258a97fcc2e4a and fixed in 6.9 with commit 6467cda18c9f9b5f2f9a0aa1e2861c653e41f382 |
| |
| 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-2024-35920 |
| 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/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c |
| drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c |
| drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.h |
| drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.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/0a2dc707aa42214f9c4827bd57e344e29a0841d6 |
| https://git.kernel.org/stable/c/23aaf824121055ba81b55f75444355bd83c8eb38 |
| https://git.kernel.org/stable/c/6467cda18c9f9b5f2f9a0aa1e2861c653e41f382 |
