Description
In the Linux kernel, the following vulnerability has been resolved: tty: Fix out-of-bound vmalloc access in imageblit This issue happens when a userspace program does an ioctl FBIOPUT_VSCREENINFO passing the fb_var_screeninfo struct containing only the fields xres, yres, and bits_per_pixel with values. If this struct is the same as the previous ioctl, the vc_resize() detects it and doesn't call the resize_screen(), leaving the fb_var_screeninfo incomplete. And this leads to the updatescrollmode() calculates a wrong value to fbcon_display->vrows, which makes the real_y() return a wrong value of y, and that value, eventually, causes the imageblit to access an out-of-bound address value. To solve this issue I made the resize_screen() be called even if the screen does not need any resizing, so it will "fix and fill" the fb_var_screeninfo independently.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 7e71fcedfda6f7de18f850a6b36e78d78b04476faffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 70aed03b1d5a5df974f456cdc8eedb213c94bb8baffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 067c694d06040db6f0c65281bb358452ca6d85b9affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 8a6a240f52e14356386030d8958ae8b1761d2325affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 883f7897a25e3ce14a7f274ca4c73f49ac84002aaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < d570c48dd37dbe8fc6875d4461d01a9554ae2560affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 699d926585daa6ec44be556cdc1ab89e5d54557baffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 3b0c406124719b625b1aba431659f5cdc24a982caffected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected4.4.286 to ≤ 4.4.*unaffected4.9.285 to ≤ 4.9.*unaffected4.14.249 to ≤ 4.14.*unaffected4.19.209 to ≤ 4.19.*unaffected5.4.151 to ≤ 5.4.*unaffected5.10.71 to ≤ 5.10.*unaffected5.14.10 to ≤ 5.14.*unaffected5.15 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/7e71fcedfda6f7de18f850a6b36e78d78b04476f ↗
- https://git.kernel.org/stable/c/70aed03b1d5a5df974f456cdc8eedb213c94bb8b ↗
- https://git.kernel.org/stable/c/067c694d06040db6f0c65281bb358452ca6d85b9 ↗
- https://git.kernel.org/stable/c/8a6a240f52e14356386030d8958ae8b1761d2325 ↗
- https://git.kernel.org/stable/c/883f7897a25e3ce14a7f274ca4c73f49ac84002a ↗
- https://git.kernel.org/stable/c/d570c48dd37dbe8fc6875d4461d01a9554ae2560 ↗
- https://git.kernel.org/stable/c/699d926585daa6ec44be556cdc1ab89e5d54557b ↗
- https://git.kernel.org/stable/c/3b0c406124719b625b1aba431659f5cdc24a982c ↗