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capabilities.7: Improve the discussion of when file capabilities are ignored 

The text stated that the execve() capability transitions are not
performed for the same reasons that setuid and setgid mode bits
may be ignored (as described in execve(2)). But, that's not quite
correct: rather, the file capability sets are treated as empty
for the purpose of the capability transition calculations.

Also merge the new 'no_file_caps' kernel option text into the
same paragraph.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2019-02-12 10:29:21 +01:00
parent f6acfeb8f8
commit 1a9ed17c9e
1 changed files with 4 additions and 7 deletions
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man7/capabilities.7
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@ -1129,16 +1129,13 @@ in the same manner as shown above for
.IR P(bounding) .
.PP
.IR Note :
the capability transitions described above may
.I not
be performed (i.e., file capabilities may be ignored) for the same reasons
during the capability transitions described above,
file capabilities may be ignored (treated as empty) for the same reasons
that the set-user-ID and set-group-ID bits are ignored; see
.BR execve (2).
.IR Note :
if the kernel was booted with the
File capabilities are similarly ignored if the kernel was booted with the
.I no_file_caps
option, then file capabilities are ignored (treated as empty)
during the capability transitions described above.
option.
.PP
.IR Note :
according to the rules above,