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Differential D14228

bsd.linker.mk: add retpolineplt linker feature
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Authored by emaste on Feb 6 2018, 8:09 PM.
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dim
imp
lattera-gmail.com

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bdrewery
imp
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rS328972: add retpoline compiler and linker feature flags
Summary

This feature indicates that the linker supports generating a PLT with the retpoline speculative execution vulnerability mitigation.

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emaste created this revision.Feb 6 2018, 8:09 PM
emaste updated this revision to Diff 38967.Feb 6 2018, 8:18 PM

Include COMPILER_FEATURES

emaste updated this revision to Diff 38977.Feb 6 2018, 10:36 PM
emaste added subscribers: imp, dim.

Quote COMPILER_FEATURES for CROSSENV as it may contain spaces

dim added a comment.Feb 6 2018, 10:41 PM

This looks good to me, though at some version gcc and BFD ld will also support retpoline, right? We can add that later...

imp accepted this revision.Feb 6 2018, 11:03 PM

One minor quibble.

share/mk/bsd.linker.mk
76

Are there places that LINKER_FEATURES need similar treatment?

This revision is now accepted and ready to land.Feb 6 2018, 11:03 PM
emaste added a comment.Feb 7 2018, 1:08 AM
In D14228#298494, @dim wrote:

This looks good to me, though at some version gcc and BFD ld will also support retpoline, right? We can add that later...

Yes. Once the support appears in our gcc and binutils ports and we know the version we can add it.

share/mk/bsd.linker.mk
76

I did not find cases where LINKER_FEATURES is passed through the environment

Closed by commit rS328972: add retpoline compiler and linker feature flags (authored by emaste). · Explain WhyFeb 7 2018, 2:50 PM
This revision was automatically updated to reflect the committed changes.
emaste marked 2 inline comments as done.Feb 7 2018, 2:50 PM

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share/
mk/
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Diff 38967

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