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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#ifndef __AA_LIB_H#define __AA_LIB_H
#include <linux/slab.h>#include <linux/fs.h>#include <linux/lsm_hooks.h>
#include "match.h"
extern struct aa_dfa *stacksplitdfa;
/* * split individual debug cases out in preparation for finer grained * debug controls in the future. */#define dbg_printk(__fmt, __args...) pr_debug(__fmt, ##__args)
#define DEBUG_NONE 0#define DEBUG_LABEL_ABS_ROOT 1#define DEBUG_LABEL 2#define DEBUG_DOMAIN 4#define DEBUG_POLICY 8#define DEBUG_INTERFACE 0x10#define DEBUG_UNPACK 0x20#define DEBUG_TAGS 0x40
#define DEBUG_ALL 0x7f /* update if new DEBUG_X added */#define DEBUG_PARSE_ERROR (-1)
#define DEBUG_ON (aa_g_debug != DEBUG_NONE)#define DEBUG_ABS_ROOT (aa_g_debug & DEBUG_LABEL_ABS_ROOT)
#define AA_DEBUG(opt, fmt, args...) \ do { \ if (aa_g_debug & opt) \ pr_warn_ratelimited("%s: " fmt, __func__, ##args); \ } while (0)#define AA_DEBUG_LABEL(LAB, X, fmt, args...) \do { \ if ((LAB)->flags & FLAG_DEBUG1) \ AA_DEBUG(X, fmt, ##args); \} while (0)
#define AA_DEBUG_PROFILE(PROF, X, fmt...) AA_DEBUG_LABEL(&(PROF)->label, X, ##fmt)
#define AA_WARN(X) WARN((X), "APPARMOR WARN %s: %s\n", __func__, #X)
#define AA_BUG(X, args...) \ do { \ _Pragma("GCC diagnostic ignored \"-Wformat-zero-length\""); \ AA_BUG_FMT((X), "" args); \ _Pragma("GCC diagnostic warning \"-Wformat-zero-length\""); \ } while (0)#ifdef CONFIG_SECURITY_APPARMOR_DEBUG_ASSERTS#define AA_BUG_FMT(X, fmt, args...) \ WARN((X), "AppArmor WARN %s: (" #X "): " fmt, __func__, ##args)#else#define AA_BUG_FMT(X, fmt, args...) \ do { \ BUILD_BUG_ON_INVALID(X); \ no_printk(fmt, ##args); \ } while (0)#endif
int aa_parse_debug_params(const char *str);int aa_print_debug_params(char *buffer);
#define AA_ERROR(fmt, args...) \ pr_err_ratelimited("AppArmor: " fmt, ##args)
/* Flag indicating whether initialization completed */extern int apparmor_initialized;
/* semantic split of scope and view */#define aa_in_scope(SUBJ, OBJ) \ aa_ns_visible(SUBJ, OBJ, false)
#define aa_in_view(SUBJ, OBJ) \ aa_ns_visible(SUBJ, OBJ, true)
#define label_for_each_in_scope(I, NS, L, P) \ label_for_each_in_ns(I, NS, L, P)
#define fn_for_each_in_scope(L, P, FN) \ fn_for_each_in_ns(L, P, FN)
/* fn's in lib */const char *skipn_spaces(const char *str, size_t n);const char *aa_splitn_fqname(const char *fqname, size_t n, const char **ns_name, size_t *ns_len);void aa_info_message(const char *str);
/* Security blob offsets */extern struct lsm_blob_sizes apparmor_blob_sizes;
enum reftype { REF_NS, REF_PROXY, REF_RAWDATA,};
/* common reference count used by data the shows up in aafs */struct aa_common_ref { struct kref count; enum reftype reftype;};
/** * aa_strneq - compare null terminated @str to a non null terminated substring * @str: a null terminated string * @sub: a substring, not necessarily null terminated * @len: length of @sub to compare * * The @str string must be full consumed for this to be considered a match */static inline bool aa_strneq(const char *str, const char *sub, int len){ return !strncmp(str, sub, len) && !str[len];}
/** * aa_dfa_null_transition - step to next state after null character * @dfa: the dfa to match against * @start: the state of the dfa to start matching in * * aa_dfa_null_transition transitions to the next state after a null * character which is not used in standard matching and is only * used to separate pairs. */static inline aa_state_t aa_dfa_null_transition(struct aa_dfa *dfa, aa_state_t start){ /* the null transition only needs the string's null terminator byte */ return aa_dfa_next(dfa, start, 0);}
static inline bool path_mediated_fs(struct dentry *dentry){ return !(dentry->d_sb->s_flags & SB_NOUSER);}
struct aa_str_table_ent { int count; int size; char *strs;};
struct aa_str_table { int size; struct aa_str_table_ent *table;};
bool aa_resize_str_table(struct aa_str_table *t, int newsize, gfp_t gfp);void aa_destroy_str_table(struct aa_str_table *table);
struct counted_str { struct kref count; char name[];};
#define str_to_counted(str) \ ((struct counted_str *)(str - offsetof(struct counted_str, name)))
#define __counted /* atm just a notation */
void aa_str_kref(struct kref *kref);char *aa_str_alloc(int size, gfp_t gfp);
static inline __counted char *aa_get_str(__counted char *str){ if (str) kref_get(&(str_to_counted(str)->count));
return str;}
static inline void aa_put_str(__counted char *str){ if (str) kref_put(&str_to_counted(str)->count, aa_str_kref);}
/* struct aa_policy - common part of both namespaces and profiles * @name: name of the object * @hname - The hierarchical name * @list: list policy object is on * @profiles: head of the profiles list contained in the object */struct aa_policy { const char *name; __counted char *hname; struct list_head list; struct list_head profiles;};
/** * basename - find the last component of an hname * @hname: hname to find the base profile name component of (NOT NULL) * * Returns: the tail (base profile name) name component of an hname */static inline const char *basename(const char *hname){ char *split;
hname = strim((char *)hname); for (split = strstr(hname, "//"); split; split = strstr(hname, "//")) hname = split + 2;
return hname;}
/** * __policy_find - find a policy by @name on a policy list * @head: list to search (NOT NULL) * @name: name to search for (NOT NULL) * * Requires: rcu_read_lock be held * * Returns: unrefcounted policy that match @name or NULL if not found */static inline struct aa_policy *__policy_find(struct list_head *head, const char *name){ struct aa_policy *policy;
list_for_each_entry_rcu(policy, head, list) { if (!strcmp(policy->name, name)) return policy; } return NULL;}
/** * __policy_strn_find - find a policy that's name matches @len chars of @str * @head: list to search (NOT NULL) * @str: string to search for (NOT NULL) * @len: length of match required * * Requires: rcu_read_lock be held * * Returns: unrefcounted policy that match @str or NULL if not found * * if @len == strlen(@strlen) then this is equiv to __policy_find * other wise it allows searching for policy by a partial match of name */static inline struct aa_policy *__policy_strn_find(struct list_head *head, const char *str, int len){ struct aa_policy *policy;
list_for_each_entry_rcu(policy, head, list) { if (aa_strneq(policy->name, str, len)) return policy; }
return NULL;}
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);
/* * 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 * NULL if all callbacks decline to specify a transition * ERR_PTR if build @FN fails * * @FN must return a label or ERR_PTR on failure. */#define fn_label_build(L, P, GFP, FN) \({ \ __label__ __do_cleanup, __done; \ struct aa_label *__new_ = NULL; \ \ 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_ = ERR_PTR(-ENOMEM); \ goto __done; \ } \ __j = 0; \ label_for_each(__i, (L), (P)) { \ __new_ = (FN); \ if (!__new_) \ continue; \ if (IS_ERR(__new_)) \ goto __do_cleanup; \ __lvec[__j++] = __new_; \ } \ if (__j == 0) \ /* no components adding to build */ \ goto __do_cleanup; \ 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)); \ if (!__new_) \ __new_ = ERR_PTR(-ENOMEM); \ } else \ __new_ = aa_get_label(&__pvec[0]->label); \ vec_cleanup(profile, __pvec, __count); \ } else \ __new_ = ERR_PTR(-ENOMEM); \__do_cleanup: \ vec_cleanup(label, __lvec, (L)->size); \ } else { \ (P) = labels_profile(L); \ __new_ = (FN); \ } \__done: \ if (PTR_ERR(__new_)) \ AA_DEBUG(DEBUG_LABEL, "label build failed\n"); \ (__new_); \})
#define __fn_build_in_scope(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_scope(L, P, GFP, NS_FN, OTHER_FN) \({ \ fn_label_build((L), (P), (GFP), \ __fn_build_in_scope(labels_ns(L), (P), (NS_FN), (OTHER_FN))); \})
#endif /* __AA_LIB_H */