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SubjectRe: Requirements for retpoline in Linux 4.15 (was: Re: Linux 4.15)
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On Mon, 2018-01-29 at 12:19 +0100, Martin Steigerwald wrote:
>
> The whole thing works:
>
> % grep . /sys/devices/system/cpu/vulnerabilities/*                                                       
> /sys/devices/system/cpu/vulnerabilities/meltdown:Mitigation: PTI
> /sys/devices/system/cpu/vulnerabilities/spectre_v1:Vulnerable
> /sys/devices/system/cpu/vulnerabilities/spectre_v2:Mitigation: Full generic 
> retpoline
>
> I bet the virtualbox modules compiled by virtualbox-dkms will taint the 
> support, but I bet sooner or later they will support retpoline as well. 
> (Another reason to switch to KVM one day.)

As long as those are actually compiled, it should be fine. Any C code
will be built with the correct CFLAGS.

If they have explicit asm which has indirect jumps, that would still be
a problem. We just need to port objtool into the kernel and do it at
module load time, to check for that... :)[unhandled content-type:application/x-pkcs7-signature]
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