security/selinux/ss/context.c

Source file repositories/reference/linux-study-clean/security/selinux/ss/context.c

File Facts

System
Linux kernel
Corpus path
security/selinux/ss/context.c
Extension
.c
Size
867 bytes
Lines
33
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

#include <linux/jhash.h>

#include "context.h"
#include "mls.h"

u32 context_compute_hash(const struct context *c)
{
	u32 hash = 0;

	/*
	 * If a context is invalid, it will always be represented by a
	 * context struct with only the len & str set (and vice versa)
	 * under a given policy. Since context structs from different
	 * policies should never meet, it is safe to hash valid and
	 * invalid contexts differently. The context_equal() function
	 * already operates under the same assumption.
	 */
	if (c->len)
		return full_name_hash(NULL, c->str, c->len);

	hash = jhash_3words(c->user, c->role, c->type, hash);
	hash = mls_range_hash(&c->range, hash);
	return hash;
}

Annotation

Implementation Notes