Merge branch 'linus' into core/urgent

1 files changed, 30 insertions, 1 deletions

diff --git a/kernel/audit.c b/kernel/audit.c
index 939500317066..0a1355ca3d79 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -43,7 +43,7 @@
 
 #include <linux/init.h>
 #include <asm/types.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/slab.h>
@@ -55,6 +55,9 @@
 #include <net/sock.h>
 #include <net/netlink.h>
 #include <linux/skbuff.h>
+#ifdef CONFIG_SECURITY
+#include <linux/security.h>
+#endif
 #include <linux/netlink.h>
 #include <linux/freezer.h>
 #include <linux/tty.h>
@@ -1502,6 +1505,32 @@ void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
 	}
 }
 
+#ifdef CONFIG_SECURITY
+/**
+ * audit_log_secctx - Converts and logs SELinux context
+ * @ab: audit_buffer
+ * @secid: security number
+ *
+ * This is a helper function that calls security_secid_to_secctx to convert
+ * secid to secctx and then adds the (converted) SELinux context to the audit
+ * log by calling audit_log_format, thus also preventing leak of internal secid
+ * to userspace. If secid cannot be converted audit_panic is called.
+ */
+void audit_log_secctx(struct audit_buffer *ab, u32 secid)
+{
+	u32 len;
+	char *secctx;
+
+	if (security_secid_to_secctx(secid, &secctx, &len)) {
+		audit_panic("Cannot convert secid to context");
+	} else {
+		audit_log_format(ab, " obj=%s", secctx);
+		security_release_secctx(secctx, len);
+	}
+}
+EXPORT_SYMBOL(audit_log_secctx);
+#endif
+
 EXPORT_SYMBOL(audit_log_start);
 EXPORT_SYMBOL(audit_log_end);
 EXPORT_SYMBOL(audit_log_format);