guix: build GCC with --enable-standard-branch-protection

fanquake commented at 5:47 pm on March 21, 2024: member

This is one change extracted from #24123 (which now produces fully BTI & PAC enabled bins), which will mean that everything in depends, for Guix builds, is compiled using -mbranch-protection=standard.

Turning this on by default, is similar to what we already do with --enable-default-ssp, --enable-default-pie etc.

See: https://gcc.gnu.org/install/specific.html#aarch64-x-x

To enable Branch Target Identification Mechanism and Return Address Signing by default at configure time use the --enable-standard-branch-protection option.

This is equivalent to having -mbranch-protection=standard during compilation. This can be explicitly disabled during compilation by passing the -mbranch-protection=none option which turns off all types of branch protections.

guix: build GCC with --enable-standard-branch-protection

To enable Branch Target Identification Mechanism and Return
Address Signing by default at configure time use the
`--enable-standard-branch-protection` option.

This is equivalent to having `-mbranch-protection=standard` during
compilation. This can be explicitly disabled during compilation
by passing the `-mbranch-protection=none` option which turns off
all types of branch protections.

See:
https://gcc.gnu.org/install/specific.html#aarch64-x-x

7850c5fe20

DrahtBot commented at 5:47 pm on March 21, 2024: contributor

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Conflicts

Reviewers, this pull request conflicts with the following ones:

#25573 ([POC] guix: produce a fully -static-pie bitcoind by fanquake)

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DrahtBot added the label Build system on Mar 21, 2024

fanquake removed the label Build system on Mar 21, 2024

fanquake added the label DrahtBot Guix build requested on Mar 21, 2024

DrahtBot commented at 9:47 am on March 22, 2024: contributor

Guix builds (on x86_64)

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*.tar.gz	`5300e8d2c2b06535...`	`1c6ea57a7f246446...`
guix_build.log	`a83f0a774d5bb17e...`	`50629320ecf0b723...`
guix_build.log.diff		`0b946269098d5eb3...`

DrahtBot removed the label DrahtBot Guix build requested on Mar 22, 2024

DrahtBot added the label Build system on Mar 22, 2024

luke-jr commented at 3:18 am on March 23, 2024: member

Should we be doing something equivalent for aarch64 macOS?

luke-jr referenced this in commit 6a8fa8f26c on Mar 23, 2024

fanquake commented at 11:03 am on March 25, 2024: member

Should we be doing something equivalent for aarch64 macOS?

At some point, yes, however LLVM doesn’t currently expose an option. The only similar option they have is CLANG_DEFAULT_PIE_ON_LINUX (which now defaults to ON in any case). I’ll investigate other ways of doing this.

TheCharlatan approved

TheCharlatan commented at 12:30 pm on March 26, 2024: contributor

ACK 7850c5fe20a034438e00f6c12ce51efc6af3a1aa

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fanquake merged this on Mar 26, 2024

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guix: build GCC with –enable-standard-branch-protection #29695

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Guix builds (on x86_64)