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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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33
kernel/seccomp.c
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@ -1061,6 +1061,39 @@ out:
__put_seccomp_filter(filter);
return ret;
}
long seccomp_get_metadata(struct task_struct *task,
unsigned long size, void __user *data)
{
long ret;
struct seccomp_filter *filter;
struct seccomp_metadata kmd = {};
if (!capable(CAP_SYS_ADMIN) ||
current->seccomp.mode != SECCOMP_MODE_DISABLED) {
return -EACCES;
}
size = min_t(unsigned long, size, sizeof(kmd));
if (copy_from_user(&kmd, data, size))
return -EFAULT;
filter = get_nth_filter(task, kmd.filter_off);
if (IS_ERR(filter))
return PTR_ERR(filter);
memset(&kmd, 0, sizeof(kmd));
if (filter->log)
kmd.flags |= SECCOMP_FILTER_FLAG_LOG;
ret = size;
if (copy_to_user(data, &kmd, size))
ret = -EFAULT;
__put_seccomp_filter(filter);
return ret;
}
#endif
#ifdef CONFIG_SYSCTL