amd64 sendsig(): explicitly copy registers from trapframe to ucontext
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Authored by kib on Mar 29 2026, 8:10 AM.

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rG7d1285e904aa: amd64 sendsig(): explicitly copy registers from trapframe to ucontext

Summary

With the IDT event delivery, previously reserved fields in tf_cs and
tf_ss are guaranteed to be zero. With FRED, these fields are not zero,
which affects the values copied to userspace.

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rG FreeBSD src repository

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kib created this revision.Mar 29 2026, 8:10 AM

Herald added a subscriber: imp. · View Herald TranscriptMar 29 2026, 8:10 AM

kib requested review of this revision.Mar 29 2026, 8:10 AM

markj accepted this revision.Mar 29 2026, 8:28 AM

This revision is now accepted and ready to land.Mar 29 2026, 8:28 AM

Closed by commit rG7d1285e904aa: amd64 sendsig(): explicitly copy registers from trapframe to ucontext (authored by kib). · Explain WhyMar 29 2026, 9:04 AM

This revision was automatically updated to reflect the committed changes.

kib added a commit: rG7d1285e904aa: amd64 sendsig(): explicitly copy registers from trapframe to ucontext.

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sys/

amd64/

exec_machdep.c

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sys/amd64/amd64/exec_machdep.c

amd64 sendsig(): explicitly copy registers from trapframe to ucontextClosedPublicActions