CVE-2022-48945 in Linux
摘要
由 VulDB • 2026-06-21
在 Linux 内核中，已修复以下漏洞：
media: vivid: 修正 compose 尺寸超出边界的问题
syzkaller 发现了一个 bug：
BUG: unable to handle page fault for address: ffffc9000a3b1000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 100000067 P4D 100000067 PUD 10015f067 PMD 1121ca067 PTE 0 Oops: 0002 [#1] PREEMPT SMP
CPU: 0 PID: 23489 Comm: vivid-000-vid-c Not tainted 6.1.0-rc1+ #512 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:memcpy_erms+0x6/0x10 [...]
Call Trace:
? tpg_fill_plane_buffer+0x856/0x15b0 vivid_fillbuff+0x8ac/0x1110 vivid_thread_vid_cap_tick+0x361/0xc90 vivid_thread_vid_cap+0x21a/0x3a0 kthread+0x143/0x180 ret_from_fork+0x1f/0x30
这是因为我们在调整 compose->height 后忘记检查边界，针对 V4L2_SEL_TGT_CROP case。添加 v4l2_rect_map_inside() 以修复此问题。
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