security/apparmor/include/match.h

Source file repositories/reference/linux-study-clean/security/apparmor/include/match.h

File Facts

System
Linux kernel
Corpus path
security/apparmor/include/match.h
Extension
.h
Size
5668 bytes
Lines
194
Domain
Core OS
Bucket
Security And Isolation
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct table_set_header {
	u32 th_magic;		/* YYTH_MAGIC */
	u32 th_hsize;
	u32 th_ssize;
	u16 th_flags;
	char th_version[];
};

/* The YYTD_ID are one less than flex table mappings.  The flex id
 * has 1 subtracted at table load time, this allows us to directly use the
 * ID's as indexes.
 */
#define	YYTD_ID_ACCEPT	0
#define YYTD_ID_BASE	1
#define YYTD_ID_CHK	2
#define YYTD_ID_DEF	3
#define YYTD_ID_EC	4
#define YYTD_ID_META	5
#define YYTD_ID_ACCEPT2 6
#define YYTD_ID_NXT	7
#define YYTD_ID_TSIZE	8
#define YYTD_ID_MAX	8

#define YYTD_DATA8	1
#define YYTD_DATA16	2
#define YYTD_DATA32	4
#define YYTD_DATA64	8

/* ACCEPT & ACCEPT2 tables gets 6 dedicated flags, YYTD_DATAX define the
 * first flags
 */
#define ACCEPT1_FLAGS(X) ((X) & 0x3f)
#define ACCEPT2_FLAGS(X) ACCEPT1_FLAGS((X) >> YYTD_ID_ACCEPT2)
#define TO_ACCEPT1_FLAG(X) ACCEPT1_FLAGS(X)
#define TO_ACCEPT2_FLAG(X) (ACCEPT1_FLAGS(X) << YYTD_ID_ACCEPT2)
#define DFA_FLAG_VERIFY_STATES 0x1000

struct table_header {
	u16 td_id;
	u16 td_flags;
	u32 td_hilen;
	u32 td_lolen;
	char td_data[];
};

#define TABLE_DATAU16(TABLE) ((u16 *)((TABLE)->td_data))
#define TABLE_DATAU32(TABLE) ((u32 *)((TABLE)->td_data))
#define DEFAULT_TABLE(DFA) ((u32 *)((DFA)->tables[YYTD_ID_DEF]->td_data))
#define BASE_TABLE(DFA) ((u32 *)((DFA)->tables[YYTD_ID_BASE]->td_data))
#define NEXT_TABLE(DFA) ((u32 *)((DFA)->tables[YYTD_ID_NXT]->td_data))
#define CHECK_TABLE(DFA) ((u32 *)((DFA)->tables[YYTD_ID_CHK]->td_data))
#define EQUIV_TABLE(DFA) ((u8 *)((DFA)->tables[YYTD_ID_EC]->td_data))
#define ACCEPT_TABLE(DFA) ((u32 *)((DFA)->tables[YYTD_ID_ACCEPT]->td_data))
#define ACCEPT_TABLE2(DFA) ((u32 *)((DFA)->tables[YYTD_ID_ACCEPT2]->td_data))

struct aa_dfa {
	struct kref count;
	u16 flags;
	u32 max_oob;
	struct table_header *tables[YYTD_ID_TSIZE];
};

#define UNPACK_ARRAY(TABLE, BLOB, LEN, TTYPE, BTYPE, NTOHX)	\
	do { \
		typeof(LEN) __i; \
		TTYPE *__t = (TTYPE *) TABLE; \
		BTYPE *__b = (BTYPE *) BLOB; \
		BUILD_BUG_ON(sizeof(TTYPE) != sizeof(BTYPE)); \
		if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) \
			memcpy(__t, __b, (LEN) * sizeof(BTYPE)); \
		else /* copy & convert from big-endian */ \
			for (__i = 0; __i < LEN; __i++) { \
				__t[__i] = NTOHX(&__b[__i]); \
			} \
	} while (0)

static inline size_t table_size(size_t len, size_t el_size)
{
	return ALIGN(sizeof(struct table_header) + len * el_size, 8);
}

#define aa_state_t unsigned int

struct aa_dfa *aa_dfa_unpack(void *blob, size_t size, int flags);
aa_state_t aa_dfa_match_len(struct aa_dfa *dfa, aa_state_t start,
			    const char *str, int len);
aa_state_t aa_dfa_match(struct aa_dfa *dfa, aa_state_t start,
			const char *str);
aa_state_t aa_dfa_next(struct aa_dfa *dfa, aa_state_t state, const char c);
aa_state_t aa_dfa_outofband_transition(struct aa_dfa *dfa, aa_state_t state);

Annotation

Implementation Notes