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ptrace, seccomp: add support for retrieving seccomp metadata

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With the new SECCOMP_FILTER_FLAG_LOG, we need to be able to extract these
flags for checkpoint restore, since they describe the state of a filter.

So, let's add PTRACE_SECCOMP_GET_METADATA, similar to ..._GET_FILTER, which
returns the metadata of the nth filter (right now, just the flags).
Hopefully this will be future proof, and new per-filter metadata can be
added to this struct.

Signed-off-by: Tycho Andersen <[email protected]>
CC: Kees Cook <[email protected]>
CC: Andy Lutomirski <[email protected]>
CC: Oleg Nesterov <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
This commit is contained in:
Tycho Andersen 2017-10-11 09:39:21 -06:00 • committed by Kees Cook
commit 26500475ac
4 changed files with 51 additions and 0 deletions
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4
kernel/ptrace.c
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@ -1092,6 +1092,10 @@ int ptrace_request(struct task_struct *child, long request,
ret = seccomp_get_filter(child, addr, datavp);
break;
case PTRACE_SECCOMP_GET_METADATA:
ret = seccomp_get_metadata(child, addr, datavp);
break;
default:
break;
}