asan: Use memset_early() to fill shadow memory
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Authored by markj on Feb 3 2026, 2:46 PM.

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rG451b2c0a1274: asan: Use memset_early() to fill shadow memory
rG4c23a98ba3af: asan: Use memset_early() to fill shadow memory

Summary

__builtin_memset() calls are replaced with calls to memcpy(), but this
can't be used before ifunc relocations are processed. Just
unconditionally use memset_early() to work around this.

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rG FreeBSD src repository

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Tests Not Applicable

Event Timeline

markj created this revision.Feb 3 2026, 2:46 PM

Herald added subscribers: olce, imp. · View Herald TranscriptFeb 3 2026, 2:46 PM

markj requested review of this revision.Feb 3 2026, 2:46 PM

Harbormaster completed remote builds in B70371: Diff 171071.Feb 3 2026, 2:46 PM

Update the KMSAN runtime too.

Harbormaster completed remote builds in B70372: Diff 171072.Feb 3 2026, 2:49 PM

markj mentioned this in D55075: kern linker: Mark link_elf_ireloc as no-KASAN.Feb 3 2026, 2:49 PM

andrew accepted this revision.Feb 10 2026, 10:41 AM

This revision is now accepted and ready to land.Feb 10 2026, 10:41 AM

Closed by commit rG4c23a98ba3af: asan: Use memset_early() to fill shadow memory (authored by markj). · Explain WhyFeb 10 2026, 3:11 PM

This revision was automatically updated to reflect the committed changes.

markj added a commit: rG4c23a98ba3af: asan: Use memset_early() to fill shadow memory.

markj added a commit: rG451b2c0a1274: asan: Use memset_early() to fill shadow memory.Mar 31 2026, 3:58 PM

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sys/

kern/

subr_asan.c

4 lines

Diff 171651

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asan: Use memset_early() to fill shadow memoryClosedPublicActions