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Do not try to acquire capabilities we are not allowed to #2000

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merged 1 commit into from
Jun 6, 2023

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jprendes
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@jprendes jprendes commented Jun 2, 2023

Currently reset_effective tries to acquire all know capabilities from a hardcoded list.
According to https://man7.org/linux/man-pages/man7/capabilities.7.html only capabilities in the permitted set can be acquired.
Trying to acquire a capability beyond those in the permitted set will result in EPERM (see https://man7.org/linux/man-pages/man2/capset.2.html).
This change modifies reset_effective so that it only acquires the capabilities in the permitted set.
This change is intended to fix #1999.

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codecov-commenter commented Jun 2, 2023

Codecov Report

Merging #2000 (b0fbe71) into main (cb75d26) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

Additional details and impacted files
@@            Coverage Diff             @@
##             main    #2000      +/-   ##
==========================================
- Coverage   65.28%   65.26%   -0.02%     
==========================================
  Files         129      129              
  Lines       14784    14802      +18     
==========================================
+ Hits         9651     9661      +10     
- Misses       5133     5141       +8     

@jprendes jprendes changed the title Do not set all capabilities before dropping them Do not try to acquire capabilities we are not allowed to Jun 5, 2023
@jprendes jprendes marked this pull request as ready for review June 5, 2023 16:17
Signed-off-by: Jorge Prendes <jorge.prendes@gmail.com>
@yihuaf yihuaf merged commit 2ff8b97 into containers:main Jun 6, 2023
@jprendes jprendes deleted the fix-caps branch June 6, 2023 08:47
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Youki fails when some unused capability is missing
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