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apparmor: add cross check permission helper macros 

The cross check permission helper macros will help simplify code
that does cross task permission checks like ptrace.

Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2017-06-09 14:23:09 -07:00
parent 86b92cb782
commit ca916e8e2d
1 changed files with 41 additions and 1 deletions
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42
security/apparmor/include/perms.h
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@ -92,7 +92,47 @@ struct aa_perms {
extern struct aa_perms nullperms;
extern struct aa_perms allperms;
struct aa_profile;
#define xcheck(FN1, FN2) \
({ \
int e, error = FN1; \
e = FN2; \
if (e) \
error = e; \
error; \
})
/*
* TODO: update for labels pointing to labels instead of profiles
* TODO: optimize the walk, currently does subwalk of L2 for each P in L1
* gah this doesn't allow for label compound check!!!!
*/
#define xcheck_ns_profile_profile(P1, P2, FN, args...) \
({ \
int ____e = 0; \
if (P1->ns == P2->ns) \
____e = FN((P1), (P2), args); \
(____e); \
})
#define xcheck_ns_profile_label(P, L, FN, args...) \
({ \
struct aa_profile *__p2; \
fn_for_each((L), __p2, \
xcheck_ns_profile_profile((P), __p2, (FN), args)); \
})
#define xcheck_ns_labels(L1, L2, FN, args...) \
({ \
struct aa_profile *__p1; \
fn_for_each((L1), __p1, FN(__p1, (L2), args)); \
})
/* Do the cross check but applying FN at the profiles level */
#define xcheck_labels_profiles(L1, L2, FN, args...) \
xcheck_ns_labels((L1), (L2), xcheck_ns_profile_label, (FN), args)
void aa_perm_mask_to_str(char *str, const char *chrs, u32 mask);
void aa_audit_perm_names(struct audit_buffer *ab, const char **names, u32 mask);