Vulnerability CVE-2024-35996
Published: 2024-05-20

Description:
In the Linux kernel, the following vulnerability has been resolved:

cpu: Re-enable CPU mitigations by default for !X86 architectures

Rename x86's to CPU_MITIGATIONS, define it in generic code, and force it
on for all architectures exception x86. A recent commit to turn
mitigations off by default if SPECULATION_MITIGATIONS=n kinda sorta
missed that "cpu_mitigations" is completely generic, whereas
SPECULATION_MITIGATIONS is x86-specific.

Rename x86's SPECULATIVE_MITIGATIONS instead of keeping both and have it
select CPU_MITIGATIONS, as having two configs for the same thing is
unnecessary and confusing. This will also allow x86 to use the knob to
manage mitigations that aren't strictly related to speculative
execution.

Use another Kconfig to communicate to common code that CPU_MITIGATIONS
is already defined instead of having x86's menu depend on the common
CPU_MITIGATIONS. This allows keeping a single point of contact for all
of x86's mitigations, and it's not clear that other architectures *want*
to allow disabling mitigations at compile-time.

 References:
https://git.kernel.org/stable/c/af6d6a923b40bf6471e44067ac61cc5814b48e7f
https://git.kernel.org/stable/c/36b32816fbab267611f073223f1b0b816ec5920f
https://git.kernel.org/stable/c/38f17d1fbb5bfb56ca1419e2d06376d57a9396f9
https://git.kernel.org/stable/c/8292f4f8dd1b005d0688d726261004f816ef730a
https://git.kernel.org/stable/c/fd8547ebc187037cc69441a15c1441aeaab80f49
https://git.kernel.org/stable/c/fe42754b94a42d08cf9501790afc25c4f6a5f631
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