security/selinux/ss/mls_types.h

Source file repositories/reference/linux-study-clean/security/selinux/ss/mls_types.h

File Facts

System
Linux kernel
Corpus path
security/selinux/ss/mls_types.h
Extension
.h
Size
1390 bytes
Lines
53
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 mls_level {
	u32 sens; /* sensitivity */
	struct ebitmap cat; /* category set */
};

struct mls_range {
	struct mls_level level[2]; /* low == level[0], high == level[1] */
};

static inline int mls_level_eq(const struct mls_level *l1,
			       const struct mls_level *l2)
{
	return ((l1->sens == l2->sens) && ebitmap_equal(&l1->cat, &l2->cat));
}

static inline int mls_level_dom(const struct mls_level *l1,
				const struct mls_level *l2)
{
	return ((l1->sens >= l2->sens) &&
		ebitmap_contains(&l1->cat, &l2->cat, 0));
}

#define mls_level_incomp(l1, l2) \
	(!mls_level_dom((l1), (l2)) && !mls_level_dom((l2), (l1)))

#define mls_level_between(l1, l2, l3) \
	(mls_level_dom((l1), (l2)) && mls_level_dom((l3), (l1)))

#define mls_range_contains(r1, r2)                        \
	(mls_level_dom(&(r2).level[0], &(r1).level[0]) && \
	 mls_level_dom(&(r1).level[1], &(r2).level[1]))

#endif /* _SS_MLS_TYPES_H_ */

Annotation

Implementation Notes