CVE-2024-35987 Information

Description

In the Linux kernel the following vulnerability has been resolved:

riscv: Fix loading 64-bit NOMMU kernels past the start of RAM

commit 3335068f8721 ( iscv: Use PUD/P4D/PGD pages for the linear mapping) added logic to allow using RAM below the kernel load address. However this does not work for NOMMU where PAGE_OFFSET is fixed to the kernel load address. Since that range of memory corresponds to PFNs below ARCH_PFN_OFFSET mm initialization runs off the beginning of mem_map and corrupts adjacent kernel memory. Fix this by restoring the previous behavior for NOMMU kernels.

Reference

https://git.kernel.org/stable/c/b008e327fa570aca210f98c817757649bae56694 https://git.kernel.org/stable/c/ea6628e4e2353978af7e3b4ad4fdaab6149acf3d https://git.kernel.org/stable/c/aea702dde7e9876fb00571a2602f25130847bf0f