libselinux/libselinux-rhat.patch

diff --git a/libselinux/include/selinux/selinux.h b/libselinux/include/selinux/selinux.h
index d29b0c1..792e68e 100644
--- a/libselinux/include/selinux/selinux.h
+++ b/libselinux/include/selinux/selinux.h
@@ -500,6 +500,25 @@ extern const char *selinux_colors_path(void);
 extern const char *selinux_netfilter_context_path(void);
 extern const char *selinux_path(void);
 
+/**
+ * selinux_check_access - Check permissions and perform appropriate auditing.
+ * @scon: source security context
+ * @tcon: target security context
+ * @tclass: target security class string
+ * @perm: requested permissions string, interpreted based on @tclass
+ * @auditdata: auxiliary audit data
+ *
+ * Check the AVC to determine whether the @perm permissions are granted
+ * for the SID pair (@scon, @tcon), interpreting the permissions
+ * based on @tclass.
+ * Return %0 if all @perm permissions are granted, -%1 with 
+ * @errno set to %EACCES if any permissions are denied or to another 
+ * value upon other errors.
+ * If auditing or logging is configured the appropriate callbacks will be called
+ * and passed the auditdata field
+ */
+extern int selinux_check_access(const security_context_t scon, const security_context_t tcon, const char *tclass, const char *perm, void *auditdata);
+
 /* Check a permission in the passwd class.
    Return 0 if granted or -1 otherwise. */
 extern int selinux_check_passwd_access(access_vector_t requested);
diff --git a/libselinux/man/man3/matchpathcon.3 b/libselinux/man/man3/matchpathcon.3
index cdbb252..e2a4371 100644
--- a/libselinux/man/man3/matchpathcon.3
+++ b/libselinux/man/man3/matchpathcon.3
@@ -8,7 +8,7 @@ matchpathcon, matchpathcon_index \- get the default SELinux security context for
 
 .BI "int matchpathcon_init(const char *" path ");"
 
-.BI "int matchpathcon_init_prefix(const char *" path ", const char *" subset ");"
+.BI "int matchpathcon_init_prefix(const char *" path ", const char *" prefix ");"
 
 .BI "int matchpathcon_fini(void);"
 .sp
@@ -48,7 +48,7 @@ is the same as
 but only loads entries with regular expressions that have stems prefixed
 by
 .I prefix.
-
+prefix can have multiple paths separated by ":", for example "/dev:/var/run:/tmp"
 .sp
 .B matchpathcon_fini
 frees the memory allocated by a prior call to
diff --git a/libselinux/man/man3/security_compute_av.3 b/libselinux/man/man3/security_compute_av.3
index f2d9f30..1e36952 100644
--- a/libselinux/man/man3/security_compute_av.3
+++ b/libselinux/man/man3/security_compute_av.3
@@ -24,6 +24,8 @@ the SELinux policy database in the kernel.
 .BI "int security_get_initial_context(const char *" name ", security_context_t
 "con );
 .sp
+.BI "int selinux_check_access(const security_context_t " scon, " const security_context_t " tcon, " const char *" class, " const char *" perm, "void *" auditdata);
+.sp
 .BI "int selinux_check_passwd_access(access_vector_t " requested );
 .sp
 .BI "int checkPasswdAccess(access_vector_t " requested );
@@ -74,6 +76,9 @@ source context. It is mainly used by
 is used to get the context of a kernel initial security identifier specified by 
 .I name
 
+.B selinux_check_access
+is used to check if the source context has the access permission for the specified class on the target context.
+
 .B selinux_check_passwd_access
 is used to check for a permission in the
 .I passwd
diff --git a/libselinux/man/man3/selabel_open.3 b/libselinux/man/man3/selabel_open.3
index 8674e37..89bb4d3 100644
--- a/libselinux/man/man3/selabel_open.3
+++ b/libselinux/man/man3/selabel_open.3
@@ -66,6 +66,13 @@ A non-null value for this option enables context validation.  By default,
 is used; a custom validation function can be provided via
 .BR selinux_set_callback (3).
 Note that an invalid context may not be treated as an error unless it is actually encountered during a lookup operation.
+.TP
+.B SELABEL_OPT_SUBSET
+A ":" separates string of path prefixes that tell the system to only loads entries with regular expressions that could match this strings. For example "/dev:/var/run:/tmp".  This option can cause the system to use less memory and work faster, but you should only use paths that begin with a prefix.
+.TP
+.B SELABEL_OPT_PATH
+A string representing an alternate path the the regular expressions.
+.sp
 
 .SH "BACKENDS"
 
@@ -99,4 +106,3 @@ Eamon Walsh <ewalsh@tycho.nsa.gov>
 .BR selabel_stats (3),
 .BR selinux_set_callback (3),
 .BR selinux (8)
-
diff --git a/libselinux/man/man3/selinux_check_access.3 b/libselinux/man/man3/selinux_check_access.3
new file mode 100644
index 0000000..a60bca4
--- /dev/null
+++ b/libselinux/man/man3/selinux_check_access.3
@@ -0,0 +1 @@
+.so man3/security_compute_av.3
diff --git a/libselinux/src/avc.c b/libselinux/src/avc.c
index 74591b4..e7ad31d 100644
--- a/libselinux/src/avc.c
+++ b/libselinux/src/avc.c
@@ -165,6 +165,9 @@ int avc_init(const char *prefix,
 	struct avc_node *new;
 	int i, rc = 0;
 
+	if (avc_running)
+		return 0;
+
 	if (prefix)
 		strncpy(avc_prefix, prefix, AVC_PREFIX_SIZE - 1);
 
diff --git a/libselinux/src/callbacks.c b/libselinux/src/callbacks.c
index b245364..7c47222 100644
--- a/libselinux/src/callbacks.c
+++ b/libselinux/src/callbacks.c
@@ -16,6 +16,7 @@ default_selinux_log(int type __attribute__((unused)), const char *fmt, ...)
 {
 	int rc;
 	va_list ap;
+	if (is_selinux_enabled() == 0) return 0;
 	va_start(ap, fmt);
 	rc = vfprintf(stderr, fmt, ap);
 	va_end(ap);
diff --git a/libselinux/src/checkAccess.c b/libselinux/src/checkAccess.c
index c1982c7..59c8abb 100644
--- a/libselinux/src/checkAccess.c
+++ b/libselinux/src/checkAccess.c
@@ -4,8 +4,40 @@
 #include <errno.h>
 #include "selinux_internal.h"
 #include <selinux/flask.h>
+#include <selinux/avc.h>
 #include <selinux/av_permissions.h>
 
+static pthread_once_t once = PTHREAD_ONCE_INIT;
+
+static void avc_init_once(void)
+{
+	avc_open(NULL, 0);
+}
+
+int selinux_check_access(const security_context_t scon, const security_context_t tcon, const char *class, const char *perm, void *aux) {
+	int status = -1;
+	int rc = -1;
+	security_id_t scon_id;
+	security_id_t tcon_id;
+	security_class_t sclass;
+	access_vector_t av;
+
+	if (is_selinux_enabled() == 0)
+		return 0;
+
+	__selinux_once(once, avc_init_once);
+
+	if ((rc = avc_context_to_sid(scon, &scon_id)) < 0)  return rc;
+
+	if ((rc = avc_context_to_sid(tcon, &tcon_id)) < 0)  return rc;
+
+	if ((sclass = string_to_security_class(class)) == 0) return status;
+
+	if ((av = string_to_av_perm(sclass, perm)) == 0) return status;
+
+	return avc_has_perm (scon_id, tcon_id, sclass, av, NULL, aux);
+}
+
 int selinux_check_passwd_access(access_vector_t requested)
 {
 	int status = -1;
diff --git a/libselinux/src/label_file.c b/libselinux/src/label_file.c
index 3b8346d..02f3f98 100644
--- a/libselinux/src/label_file.c
+++ b/libselinux/src/label_file.c
@@ -27,6 +27,7 @@
  * Internals, mostly moved over from matchpathcon.c
  */
 
+#define MAX_PREFIX 100
 /* A file security context specification. */
 typedef struct spec {
 	struct selabel_lookup_rec lr;	/* holds contexts for lookup result */
@@ -279,7 +280,7 @@ static int compile_regex(struct saved_data *data, spec_t *spec, char **errbuf)
 
 
 static int process_line(struct selabel_handle *rec,
-			const char *path, const char *prefix,
+			const char *path, const char **prefix_array,
 			char *line_buf, int pass, unsigned lineno)
 {
 	int items, len;
@@ -313,12 +314,24 @@ static int process_line(struct selabel_handle *rec,
 	}
 
 	len = get_stem_from_spec(regex);
-	if (len && prefix && strncmp(prefix, regex, len)) {
-		/* Stem of regex does not match requested prefix, discard. */
-		free(regex);
-		free(type);
-		free(context);
-		return 0;
+	if (len && prefix_array[0]) {
+		int i = 0;
+		int found = 0;
+		while (i < MAX_PREFIX && prefix_array[i]) {
+			if (strncmp(prefix_array[i], regex, len) == 0) {
+				found = 1;
+				break;
+			}
+			i++;
+		}
+
+		if (! found) {
+			/* Stem of regex does not match requested prefix, discard. */
+			free(regex);
+			free(type);
+			free(context);
+			return 0;
+		}
 	}
 
 	if (pass == 1) {
@@ -400,7 +413,7 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
 {
 	struct saved_data *data = (struct saved_data *)rec->data;
 	const char *path = NULL;
-	const char *prefix = NULL;
+	const char *prefix_array[MAX_PREFIX] = {NULL,};
 	FILE *fp;
 	FILE *localfp = NULL;
 	FILE *homedirfp = NULL;
@@ -421,8 +434,19 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
 			path = opts[n].value;
 			break;
 		case SELABEL_OPT_SUBSET:
-			prefix = opts[n].value;
+		{ 
+			char *ptr;
+			i = 0;
+			if (opts[n].value) {
+				prefix_array[i] = strtok_r((char *)opts[n].value, ":", &ptr);
+				while ((prefix_array[i] != NULL) && i < MAX_PREFIX - 1) {
+					i++;
+					prefix_array[i] = strtok_r(NULL, ":", &ptr);
+				}
+			}
+
 			break;
+		}
 		case SELABEL_OPT_BASEONLY:
 			baseonly = !!opts[n].value;
 			break;
@@ -481,7 +505,7 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
 		data->ncomp = 0;
 		while (getline(&line_buf, &line_len, fp) > 0
 		       && data->nspec < maxnspec) {
-			if (process_line(rec, path, prefix, line_buf,
+			if (process_line(rec, path, prefix_array, line_buf,
 					 pass, ++lineno) != 0)
 				goto finish;
 		}
@@ -495,7 +519,7 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
 			while (getline(&line_buf, &line_len, homedirfp) > 0
 			       && data->nspec < maxnspec) {
 				if (process_line
-				    (rec, homedir_path, prefix,
+				    (rec, homedir_path, prefix_array,
 				     line_buf, pass, ++lineno) != 0)
 					goto finish;
 			}
@@ -505,7 +529,7 @@ static int init(struct selabel_handle *rec, struct selinux_opt *opts,
 			while (getline(&line_buf, &line_len, localfp) > 0
 			       && data->nspec < maxnspec) {
 				if (process_line
-				    (rec, local_path, prefix, line_buf,
+				    (rec, local_path, prefix_array, line_buf,
 				     pass, ++lineno) != 0)
 					goto finish;
 			}
diff --git a/libselinux/src/load_policy.c b/libselinux/src/load_policy.c
index 868660f..7fa6383 100644
--- a/libselinux/src/load_policy.c
+++ b/libselinux/src/load_policy.c
@@ -380,7 +380,7 @@ int selinux_init_load_policy(int *enforce)
 	}
 
 	if (! mntpoint ) {
-		if (errno == ENODEV) {
+		if (errno == ENODEV || errno == ENOENT) {
 			/*
 			 * SELinux was disabled in the kernel, either
 			 * omitted entirely or disabled at boot via selinux=0.
diff --git a/libselinux/src/matchpathcon.c b/libselinux/src/matchpathcon.c
index 5914afa..df83b30 100644
--- a/libselinux/src/matchpathcon.c
+++ b/libselinux/src/matchpathcon.c
@@ -2,6 +2,7 @@
 #include <string.h>
 #include <errno.h>
 #include <stdio.h>
+#include <syslog.h>
 #include "selinux_internal.h"
 #include "label_internal.h"
 #include "callbacks.h"
@@ -62,7 +63,7 @@ static void
 {
 	va_list ap;
 	va_start(ap, fmt);
-	vfprintf(stderr, fmt, ap);
+	vsyslog(LOG_ERR, fmt, ap);
 	va_end(ap);
 }
 
diff --git a/libselinux/src/seusers.c b/libselinux/src/seusers.c
index fc75cb6..b653cad 100644
--- a/libselinux/src/seusers.c
+++ b/libselinux/src/seusers.c
@@ -5,6 +5,7 @@
 #include <stdio.h>
 #include <stdio_ext.h>
 #include <ctype.h>
+#include <errno.h>
 #include <selinux/selinux.h>
 #include <selinux/context.h>
 #include "selinux_internal.h"
@@ -118,13 +119,26 @@ static int check_group(const char *group, const char *name, const gid_t gid) {
 	long rbuflen = sysconf(_SC_GETGR_R_SIZE_MAX);
 	if (rbuflen <= 0)
 		return 0;
-	char *rbuf = malloc(rbuflen);
-	if (rbuf == NULL)
-		return 0;
+	char *rbuf;
 
-	if (getgrnam_r(group, &gbuf, rbuf, rbuflen, 
-		       &grent) != 0)
-		goto done;
+	while(1) {
+		rbuf = malloc(rbuflen);
+		if (rbuf == NULL)
+			return 0;
+		int retval = getgrnam_r(group, &gbuf, rbuf, 
+				rbuflen, &grent);
+		if ( retval == ERANGE )
+		{
+			free(rbuf);
+			rbuflen = rbuflen * 2;
+		} else if ( retval != 0 || grent == NULL )
+		{
+			goto done;
+		} else
+		{
+			break;
+		}
+	}
 
 	if (getgrouplist(name, gid, NULL, &ng) < 0) {
 		groups = (gid_t *) malloc(sizeof (gid_t) * ng);