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Differential D47286

lib/libc/string: add memset_explicit() for compliance with C23
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Authored by fuz on Oct 25 2024, 5:48 PM.
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Reviewers
kevans
emaste
Commits
rG8983acc8dee5: lib/libc/string: apply SSP hardening and tests to memset_explicit
rG007871c35628: lib/libc/string: add memset_explicit() for compliance with C23
Summary

Patterned after explicit_bzero sans the hook.
SSP hardening is provided, too.
The function is documented in memset(3).

Test Plan

passes newly added unit tests

Diff Detail

Repository
rG FreeBSD src repository
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Lint Not Applicable
Unit
Tests Not Applicable

Event Timeline

fuz created this revision.Oct 25 2024, 5:48 PM
Herald added a subscriber: imp. · View Herald TranscriptOct 25 2024, 5:48 PM
fuz requested review of this revision.Oct 25 2024, 5:48 PM
Harbormaster completed remote builds in B60194: Diff 145466.Oct 25 2024, 5:48 PM
fuz added a parent revision: D47284: contrib/mandoc: add -isoC-2024 and -svid1 to mdoc(7).Oct 25 2024, 5:49 PM
fuz updated this revision to Diff 146441.Nov 14 2024, 12:39 PM
  • lib/libc/string/memset_explicit.c: add weak hook to confuse LTO inlining

As requested by @emaste.

Harbormaster completed remote builds in B60557: Diff 146441.Nov 14 2024, 12:39 PM
kevans added a comment.Nov 14 2024, 4:30 PM

fortify bits look good, thanks

include/string.h
74

I believe

kevans accepted this revision.Nov 14 2024, 4:30 PM
This revision is now accepted and ready to land.Nov 14 2024, 4:30 PM
Closed by commit rG007871c35628: lib/libc/string: add memset_explicit() for compliance with C23 (authored by fuz). · Explain WhyNov 14 2024, 10:11 PM
This revision was automatically updated to reflect the committed changes.
fuz added a commit: rG007871c35628: lib/libc/string: add memset_explicit() for compliance with C23.
fuz added a commit: rG8983acc8dee5: lib/libc/string: apply SSP hardening and tests to memset_explicit.

Revision Contents
Changeset List

PathSize
include/
3 lines
lib/
libc/
string/
4 lines
4 lines
18 lines
26 lines

Diff 146474

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include/string.h

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lib/libc/string/Makefile.inc

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lib/libc/string/Symbol.map

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lib/libc/string/memset.3

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lib/libc/string/memset_explicit.c

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