kern_dup(): Call filecaps_free_prep() in a write section.
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Authored by markj on Mar 18 2020, 10:18 PM.

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kib
mjg

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rS359133: kern_dup(): Call filecaps_free_prep() in a write section.

Summary

filecaps_free_prep() bzeros the capabilities structure and we need to be
careful to synchronize with unlocked readers, which expect a consistent
rights structure.

I'm not really sure it's even worth keeping filecaps_free_prep(), since it's
doing some unnecessary work.

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Buildable 30003
Build 27816: arc lint + arc unit

Event Timeline

markj created this revision.Mar 18 2020, 10:18 PM

Harbormaster completed remote builds in B30003: Diff 69668.Mar 18 2020, 10:18 PM

markj edited the summary of this revision. (Show Details)Mar 18 2020, 10:22 PM

markj added reviewers: kib, mjg.

kib accepted this revision.Mar 18 2020, 11:50 PM

This revision is now accepted and ready to land.Mar 18 2020, 11:50 PM

The original capsicum code introduced a lot of bzeroing which can probably be eliminated.

Closed by commit rS359133: kern_dup(): Call filecaps_free_prep() in a write section. (authored by markj). · Explain WhyMar 19 2020, 3:40 PM

This revision was automatically updated to reflect the committed changes.

markj added a commit: rS359133: kern_dup(): Call filecaps_free_prep() in a write section..

Herald added a subscriber: imp. · View Herald TranscriptMar 19 2020, 3:40 PM

Revision Contents
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sys/

kern/

kern_descrip.c

2 lines

Diff 69668

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kern_dup(): Call filecaps_free_prep() in a write section.ClosedPublicActions