| 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-2022-49532: drm/virtio: fix NULL pointer dereference in virtio_gpu_conn_get_modes |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/virtio: fix NULL pointer dereference in virtio_gpu_conn_get_modes |
| |
| drm_cvt_mode may return NULL and we should check it. |
| |
| This bug is found by syzkaller: |
| |
| FAULT_INJECTION stacktrace: |
| [ 168.567394] FAULT_INJECTION: forcing a failure. |
| name failslab, interval 1, probability 0, space 0, times 1 |
| [ 168.567403] CPU: 1 PID: 6425 Comm: syz Kdump: loaded Not tainted 4.19.90-vhulk2201.1.0.h1035.kasan.eulerosv2r10.aarch64 #1 |
| [ 168.567406] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 |
| [ 168.567408] Call trace: |
| [ 168.567414] dump_backtrace+0x0/0x310 |
| [ 168.567418] show_stack+0x28/0x38 |
| [ 168.567423] dump_stack+0xec/0x15c |
| [ 168.567427] should_fail+0x3ac/0x3d0 |
| [ 168.567437] __should_failslab+0xb8/0x120 |
| [ 168.567441] should_failslab+0x28/0xc0 |
| [ 168.567445] kmem_cache_alloc_trace+0x50/0x640 |
| [ 168.567454] drm_mode_create+0x40/0x90 |
| [ 168.567458] drm_cvt_mode+0x48/0xc78 |
| [ 168.567477] virtio_gpu_conn_get_modes+0xa8/0x140 [virtio_gpu] |
| [ 168.567485] drm_helper_probe_single_connector_modes+0x3a4/0xd80 |
| [ 168.567492] drm_mode_getconnector+0x2e0/0xa70 |
| [ 168.567496] drm_ioctl_kernel+0x11c/0x1d8 |
| [ 168.567514] drm_ioctl+0x558/0x6d0 |
| [ 168.567522] do_vfs_ioctl+0x160/0xf30 |
| [ 168.567525] ksys_ioctl+0x98/0xd8 |
| [ 168.567530] __arm64_sys_ioctl+0x50/0xc8 |
| [ 168.567536] el0_svc_common+0xc8/0x320 |
| [ 168.567540] el0_svc_handler+0xf8/0x160 |
| [ 168.567544] el0_svc+0x10/0x218 |
| |
| KASAN stacktrace: |
| [ 168.567561] BUG: KASAN: null-ptr-deref in virtio_gpu_conn_get_modes+0xb4/0x140 [virtio_gpu] |
| [ 168.567565] Read of size 4 at addr 0000000000000054 by task syz/6425 |
| [ 168.567566] |
| [ 168.567571] CPU: 1 PID: 6425 Comm: syz Kdump: loaded Not tainted 4.19.90-vhulk2201.1.0.h1035.kasan.eulerosv2r10.aarch64 #1 |
| [ 168.567573] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 |
| [ 168.567575] Call trace: |
| [ 168.567578] dump_backtrace+0x0/0x310 |
| [ 168.567582] show_stack+0x28/0x38 |
| [ 168.567586] dump_stack+0xec/0x15c |
| [ 168.567591] kasan_report+0x244/0x2f0 |
| [ 168.567594] __asan_load4+0x58/0xb0 |
| [ 168.567607] virtio_gpu_conn_get_modes+0xb4/0x140 [virtio_gpu] |
| [ 168.567612] drm_helper_probe_single_connector_modes+0x3a4/0xd80 |
| [ 168.567617] drm_mode_getconnector+0x2e0/0xa70 |
| [ 168.567621] drm_ioctl_kernel+0x11c/0x1d8 |
| [ 168.567624] drm_ioctl+0x558/0x6d0 |
| [ 168.567628] do_vfs_ioctl+0x160/0xf30 |
| [ 168.567632] ksys_ioctl+0x98/0xd8 |
| [ 168.567636] __arm64_sys_ioctl+0x50/0xc8 |
| [ 168.567641] el0_svc_common+0xc8/0x320 |
| [ 168.567645] el0_svc_handler+0xf8/0x160 |
| [ 168.567649] el0_svc+0x10/0x218 |
| |
| The Linux kernel CVE team has assigned CVE-2022-49532 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.9.318 with commit e0828456578cc8ba0a69147f7ae3428392eec287 |
| Fixed in 4.14.283 with commit 848dd072744ea662ab3097e3c8282bee552df218 |
| Fixed in 4.19.247 with commit edafcad84c4134ebec4bc24b29ca4497a1184eea |
| Fixed in 5.4.198 with commit f85cb059fad03a3b33a50023be91e944bb065ae8 |
| Fixed in 5.10.121 with commit fadc626cae99aaa1325094edc6a9e2b883f3e562 |
| Fixed in 5.15.46 with commit 32e10aabc287f09a148ff759bb9ce70b01b0012c |
| Fixed in 5.17.14 with commit c51d00472fa54b9b05c17789ed665c17adf3a25d |
| Fixed in 5.18.3 with commit 0f8bc147a963686b7351aa35d1701124ffacac08 |
| Fixed in 5.19 with commit 194d250cdc4a40ccbd179afd522a9e9846957402 |
| |
| 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-2022-49532 |
| 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/gpu/drm/virtio/virtgpu_display.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/e0828456578cc8ba0a69147f7ae3428392eec287 |
| https://git.kernel.org/stable/c/848dd072744ea662ab3097e3c8282bee552df218 |
| https://git.kernel.org/stable/c/edafcad84c4134ebec4bc24b29ca4497a1184eea |
| https://git.kernel.org/stable/c/f85cb059fad03a3b33a50023be91e944bb065ae8 |
| https://git.kernel.org/stable/c/fadc626cae99aaa1325094edc6a9e2b883f3e562 |
| https://git.kernel.org/stable/c/32e10aabc287f09a148ff759bb9ce70b01b0012c |
| https://git.kernel.org/stable/c/c51d00472fa54b9b05c17789ed665c17adf3a25d |
| https://git.kernel.org/stable/c/0f8bc147a963686b7351aa35d1701124ffacac08 |
| https://git.kernel.org/stable/c/194d250cdc4a40ccbd179afd522a9e9846957402 |
