thread_create(): call cpu_copy_thread() after td_pflags is zeroed
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Authored by kib on Aug 8 2022, 12:10 PM.

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jhb
markj

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rG1b0a4974c500: thread_create(): call cpu_copy_thread() after td_pflags is zeroed

Summary

By calling the function too early we might still have the td_pflags
value cached from the previous struct thread use. cpu_copy_thread()
depends on correct value for TDP_KTHREAD at least on x86.

Reported and tested by:    pho

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rG FreeBSD src repository

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Event Timeline

kib created this revision.Aug 8 2022, 12:10 PM

Herald added a subscriber: imp. · View Herald TranscriptAug 8 2022, 12:10 PM

kib requested review of this revision.Aug 8 2022, 12:10 PM

I think linux_clone_thread() needs the same change?

Handle linuxolator use of cpu_copy_thread() as well

markj accepted this revision.Aug 8 2022, 3:52 PM

This revision is now accepted and ready to land.Aug 8 2022, 3:52 PM

Closed by commit rG1b0a4974c500: thread_create(): call cpu_copy_thread() after td_pflags is zeroed (authored by kib). · Explain WhyAug 8 2022, 4:44 PM

This revision was automatically updated to reflect the committed changes.

kib added a commit: rG1b0a4974c500: thread_create(): call cpu_copy_thread() after td_pflags is zeroed.

Revision Contents
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Path

Size

sys/

compat/

linux/

linux_fork.c

4 lines

kern/

kern_thr.c

4 lines

Diff 109007

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sys/compat/linux/linux_fork.c