Comments (1)
Note on using libseccomp: if we want to trap ioctl request 42, but allow ioctl otherwise, we can't do add_rule_conditional(Trap, ioctl, arg2 == 42)
then add_rule(Allow, ioctl)
. The later must be add_rule_conditional(Allow, ioctl, arg2 != 42)
instead.
This is documented in seccomp_rule_add(3):
All of the filter rules supplied by the calling application are combined into a union, with additional logic to eliminate redundant syscall filters. For example, if a rule is added which allows a given syscall with a specific set of argument values and later a rule is added which allows the same syscall regardless the argument values then the first, more specific rule, is effectively dropped from the filter by the second more generic rule.
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Related Issues (13)
- Transform hard-coded policies into configurations HOT 1
- Update seccomp profiles
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- Add watch mode
- Add test cases
- Audit ARM64 port
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- chmod not working under jail even when the policy allows it HOT 1
- Child count gets too much increased due to missing exit tracking HOT 1
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from backend.ai-jail.