diff options
Diffstat (limited to 'security/apparmor/include/lib.h')
| -rw-r--r-- | security/apparmor/include/lib.h | 87 |
1 files changed, 86 insertions, 1 deletions
diff --git a/security/apparmor/include/lib.h b/security/apparmor/include/lib.h index 593877d38088..436b3a722357 100644 --- a/security/apparmor/include/lib.h +++ b/security/apparmor/include/lib.h @@ -211,4 +211,89 @@ bool aa_policy_init(struct aa_policy *policy, const char *prefix, const char *name, gfp_t gfp); void aa_policy_destroy(struct aa_policy *policy); -#endif /* AA_LIB_H */ + +/* + * fn_label_build - abstract out the build of a label transition + * @L: label the transition is being computed for + * @P: profile parameter derived from L by this macro, can be passed to FN + * @GFP: memory allocation type to use + * @FN: fn to call for each profile transition. @P is set to the profile + * + * Returns: new label on success + * ERR_PTR if build @FN fails + * NULL if label_build fails due to low memory conditions + * + * @FN must return a label or ERR_PTR on failure. NULL is not allowed + */ +#define fn_label_build(L, P, GFP, FN) \ +({ \ + __label__ __cleanup, __done; \ + struct aa_label *__new_; \ + \ + if ((L)->size > 1) { \ + /* TODO: add cache of transitions already done */ \ + struct label_it __i; \ + int __j, __k, __count; \ + DEFINE_VEC(label, __lvec); \ + DEFINE_VEC(profile, __pvec); \ + if (vec_setup(label, __lvec, (L)->size, (GFP))) { \ + __new_ = NULL; \ + goto __done; \ + } \ + __j = 0; \ + label_for_each(__i, (L), (P)) { \ + __new_ = (FN); \ + AA_BUG(!__new_); \ + if (IS_ERR(__new_)) \ + goto __cleanup; \ + __lvec[__j++] = __new_; \ + } \ + for (__j = __count = 0; __j < (L)->size; __j++) \ + __count += __lvec[__j]->size; \ + if (!vec_setup(profile, __pvec, __count, (GFP))) { \ + for (__j = __k = 0; __j < (L)->size; __j++) { \ + label_for_each(__i, __lvec[__j], (P)) \ + __pvec[__k++] = aa_get_profile(P); \ + } \ + __count -= aa_vec_unique(__pvec, __count, 0); \ + if (__count > 1) { \ + __new_ = aa_vec_find_or_create_label(__pvec,\ + __count, (GFP)); \ + /* only fails if out of Mem */ \ + if (!__new_) \ + __new_ = NULL; \ + } else \ + __new_ = aa_get_label(&__pvec[0]->label); \ + vec_cleanup(profile, __pvec, __count); \ + } else \ + __new_ = NULL; \ +__cleanup: \ + vec_cleanup(label, __lvec, (L)->size); \ + } else { \ + (P) = labels_profile(L); \ + __new_ = (FN); \ + } \ +__done: \ + if (!__new_) \ + AA_DEBUG("label build failed\n"); \ + (__new_); \ +}) + + +#define __fn_build_in_ns(NS, P, NS_FN, OTHER_FN) \ +({ \ + struct aa_label *__new; \ + if ((P)->ns != (NS)) \ + __new = (OTHER_FN); \ + else \ + __new = (NS_FN); \ + (__new); \ +}) + +#define fn_label_build_in_ns(L, P, GFP, NS_FN, OTHER_FN) \ +({ \ + fn_label_build((L), (P), (GFP), \ + __fn_build_in_ns(labels_ns(L), (P), (NS_FN), (OTHER_FN))); \ +}) + +#endif /* __AA_LIB_H */ |