Preventing Spectre v1 Gadget Construction in sys_rtas()

CVE-2024-46774

What is CVE-2024-46774?

The Linux kernel vulnerability presents a significant security concern within the PowerPC architecture, where the construction of Spectre v1 gadgets in the sys_rtas function could be exploited. This vulnerability arises due to improper handling of user-supplied input that can potentially allow an attacker to manipulate indices into a stack-based array via the 'nargs' and 'nret' locals. To mitigate the associated risks, the introduction of array_index_nospec() after performing bounds checks is essential to clamp values for speculative execution, thus enhancing the security of the system. Affected users are encouraged to apply updates from the Linux Foundation to address this underlying issue.

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