security/selinux/genheaders.c

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

File Facts

System
Linux kernel
Corpus path
security/selinux/genheaders.c
Extension
.c
Size
3517 bytes
Lines
155
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 security_class_mapping {
	const char *name;
	const char *perms[sizeof(unsigned) * 8 + 1];
};

#include "classmap.h"
#include "initial_sid_to_string.h"

const char *progname;

static void usage(void)
{
	printf("usage: %s flask.h av_permissions.h\n", progname);
	exit(1);
}

static char *stoupperx(const char *s)
{
	char *s2 = strdup(s);
	char *p;

	if (!s2) {
		fprintf(stderr, "%s:  out of memory\n", progname);
		exit(3);
	}

	for (p = s2; *p; p++)
		*p = toupper(*p);
	return s2;
}

int main(int argc, char *argv[])
{
	int i, j;
	int isids_len;
	FILE *fout;

	progname = argv[0];

	if (argc < 3)
		usage();

	fout = fopen(argv[1], "w");
	if (!fout) {
		fprintf(stderr, "Could not open %s for writing:  %s\n",
			argv[1], strerror(errno));
		exit(2);
	}

	fprintf(fout, "/* This file is automatically generated.  Do not edit. */\n");
	fprintf(fout, "#ifndef _SELINUX_FLASK_H_\n#define _SELINUX_FLASK_H_\n\n");

	for (i = 0; secclass_map[i].name; i++) {
		char *name = stoupperx(secclass_map[i].name);

		fprintf(fout, "#define SECCLASS_%-39s %2d\n", name, i+1);
		free(name);
	}

	fprintf(fout, "\n");

	isids_len = sizeof(initial_sid_to_string) / sizeof(char *);
	for (i = 1; i < isids_len; i++) {
		const char *s = initial_sid_to_string[i];
		if (s) {
			char *sidname = stoupperx(s);

			fprintf(fout, "#define SECINITSID_%-39s %2d\n", sidname, i);
			free(sidname);
		}
	}
	fprintf(fout, "\n#define SECINITSID_NUM %d\n", i-1);
	fprintf(fout, "\nstatic inline bool security_is_socket_class(u16 kern_tclass)\n");
	fprintf(fout, "{\n");
	fprintf(fout, "\tbool sock = false;\n\n");
	fprintf(fout, "\tswitch (kern_tclass) {\n");
	for (i = 0; secclass_map[i].name; i++) {
		static char s[] = "SOCKET";
		int len, l;
		char *name = stoupperx(secclass_map[i].name);

		len = strlen(name);
		l = sizeof(s) - 1;
		if (len >= l && memcmp(name + len - l, s, l) == 0)
			fprintf(fout, "\tcase SECCLASS_%s:\n", name);
		free(name);
	}
	fprintf(fout, "\t\tsock = true;\n");
	fprintf(fout, "\t\tbreak;\n");
	fprintf(fout, "\tdefault:\n");

Annotation

Implementation Notes