High · published September 23, 2024
In the Linux kernel, the following vulnerability has been resolved:
media: vivid: fix compose size exceed boundary
syzkaller found a 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:
<TASK>
? 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
</TASK>
This is because we forget to check boundary after adjust compose->height
int V4L2_SEL_TGT_CROP case. Add v4l2_rect_map_inside() to fix this problem
for this case.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 3.18, < 4.9.337 | 4.9.337 |
| linux/linux_kernel | ≥ 4.10, < 4.14.303 | 4.14.303 |
| linux/linux_kernel | ≥ 4.15, < 4.19.270 | 4.19.270 |
| linux/linux_kernel | ≥ 4.20, < 5.4.229 | 5.4.229 |
| linux/linux_kernel | ≥ 5.5, < 5.10.163 | 5.10.163 |
| linux/linux_kernel | ≥ 5.11, < 5.15.86 | 5.15.86 |
| linux/linux_kernel | ≥ 5.16, < 6.0.16 | 6.0.16 |
| linux/linux_kernel | ≥ 6.1, < 6.1.2 | 6.1.2 |