CVE-2024-46774 Information

Description

In the Linux kernel the following vulnerability has been resolved:

powerpc/rtas: Prevent Spectre v1 gadget construction in sys_rtas()

Smatch warns:

arch/powerpc/kernel/rtas.c:1932 __do_sys_rtas() warn: potential spectre issue ‘args.args’ [r] (local cap)

The ’nargs’ and ’nret’ locals come directly from a user-supplied buffer and are used as indexes into a small stack-based array and as inputs to copy_to_user() after they are subject to bounds checks.

Use array_index_nospec() after the bounds checks to clamp these values for speculative execution.

Reference

https://git.kernel.org/stable/c/68d8156480940b79227d58865ec5d2947b9384a8 https://git.kernel.org/stable/c/0974d03eb479384466d828d65637814bee6b26d7