CVE-2024-46852
dma-buf: heaps: Fix off-by-one in CMA heap fault handler
We use these services and cookies to improve your user experience. You may opt out if you wish, however, this may limit some features on this site.
Please see our statement on Data Privacy.
dma-buf: heaps: Fix off-by-one in CMA heap fault handler
In the Linux kernel, the following vulnerability has been resolved: dma-buf: heaps: Fix off-by-one in CMA heap fault handler Until VM_DONTEXPAND was added in commit 1c1914d6e8c6 ("dma-buf: heaps: Don't track CMA dma-buf pages under RssFile") it was possible to obtain a mapping larger than the buffer size via mremap and bypass the overflow check in dma_buf_mmap_internal. When using such a mapping to attempt to fault past the end of the buffer, the CMA heap fault handler also checks the fault offset against the buffer size, but gets the boundary wrong by 1. Fix the boundary check so that we don't read off the end of the pages array and insert an arbitrary page in the mapping.
Reserved 2024-09-11 | Published 2024-09-27 | Updated 2024-11-05 | Assigner Linuxgit.kernel.org/...c/007180fcb6cc4a93211d4cc45fef3f5ccccd56ae
git.kernel.org/...c/79cce5e81d20fa9ad553be439d665ac3302d3c95
git.kernel.org/...c/84175dc5b2c932266a50c04e5ce342c30f817a2f
git.kernel.org/...c/eb7fc8b65cea22f9038c52398c8b22849e9620ea
git.kernel.org/...c/e79050882b857c37634baedbdcf7c2047c24cbff
git.kernel.org/...c/ea5ff5d351b520524019f7ff7f9ce418de2dad87
Support options
