seccomp: Provide matching filter for introspection

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Both the upcoming logging improvements and changes to RET_KILL will need
to know which filter a given seccomp return value originated from. In
order to delay logic processing of result until after the seccomp loop,
this adds a single pointer assignment on matches. This will allow both
log and RET_KILL logic to work off the filter rather than doing more
expensive tests inside the time-critical run_filters loop.

Running tight cycles of getpid() with filters attached shows no measurable
difference in speed.

Suggested-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Tyler Hicks <tyhicks@canonical.com>

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This commit is contained in:

Kees Cook 2017-08-02 15:00:40 -07:00

parent f3f6e30669

commit deb4de8b31

1 changed files with 15 additions and 3 deletions

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kernel/seccomp.c

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