CVE-2024-43843 Information

Description

In the Linux kernel the following vulnerability has been resolved:

riscv bpf: Fix out-of-bounds issue when preparing trampoline image

We get the size of the trampoline image during the dry run phase and allocate memory based on that size. The allocated image will then be populated with instructions during the real patch phase. But after commit 26ef208c209a (pf: Use arch_bpf_trampoline_size) the im argument is inconsistent in the dry run and real patch phase. This may cause emit_imm in RV64 to generate a different number of instructions when generating the ‘im’ address potentially causing out-of-bounds issues. Let’s emit the maximum number of instructions for the \im\naddress during dry run to fix this problem.

Reference

https://git.kernel.org/stable/c/3e6a1b1b179abb643ec3560c02bc3082bc92285f https://git.kernel.org/stable/c/9f1e16fb1fc9826001c69e0551d51fbbcd2d74e9