Do not do torn writes to active LDTs.
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Authored by kib on Sep 19 2017, 12:33 PM.

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imp

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jhb

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rS323772: Do not do torn writes to active LDTs.

Summary

Care must be taken when updating the active LDT, since parallel threads might try to load a segment descriptor which is currently updated. Since the results are undefined, this cannot be ignored by claiming to be an application race.

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rS FreeBSD src repository - subversion

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Event Timeline

kib created this revision.Sep 19 2017, 12:33 PM

Herald added a subscriber: imp. · View Herald TranscriptSep 19 2017, 12:33 PM

jhb accepted this revision.Sep 19 2017, 4:59 PM

This revision is now accepted and ready to land.Sep 19 2017, 4:59 PM

Closed by commit rS323772: Do not do torn writes to active LDTs. (authored by kib). · Explain WhySep 19 2017, 5:57 PM

This revision was automatically updated to reflect the committed changes.

Revision Contents
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Path

Size

head/

sys/

amd64/

sys_machdep.c

35 lines

i386/

sys_machdep.c

34 lines

Diff 33227

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head/sys/amd64/amd64/sys_machdep.c