3 files changed, 38 insertions, 8 deletions

diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index 3662b0f15ec5..9da6420e2056 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -488,9 +488,29 @@ void avc_audit(u32 ssid, u32 tsid,
 	struct common_audit_data stack_data;
 	u32 denied, audited;
 	denied = requested & ~avd->allowed;
-	if (denied)
+	if (denied) {
 		audited = denied & avd->auditdeny;
-	else if (result)
+		/*
+		 * a->selinux_audit_data.auditdeny is TRICKY!  Setting a bit in
+		 * this field means that ANY denials should NOT be audited if
+		 * the policy contains an explicit dontaudit rule for that
+		 * permission.  Take notice that this is unrelated to the
+		 * actual permissions that were denied.  As an example lets
+		 * assume:
+		 *
+		 * denied == READ
+		 * avd.auditdeny & ACCESS == 0 (not set means explicit rule)
+		 * selinux_audit_data.auditdeny & ACCESS == 1
+		 *
+		 * We will NOT audit the denial even though the denied
+		 * permission was READ and the auditdeny checks were for
+		 * ACCESS
+		 */
+		if (a &&
+		    a->selinux_audit_data.auditdeny &&
+		    !(a->selinux_audit_data.auditdeny & avd->auditdeny))
+			audited = 0;
+	} else if (result)
 		audited = denied = requested;
 	else
 		audited = requested & avd->auditallow;
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 0c98846f188d..650947a72a2b 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2644,16 +2644,26 @@ static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *na
 static int selinux_inode_permission(struct inode *inode, int mask)
 {
 	const struct cred *cred = current_cred();
+	struct common_audit_data ad;
+	u32 perms;
+	bool from_access;
 
+	from_access = mask & MAY_ACCESS;
 	mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
 
-	if (!mask) {
-		/* No permission to check.  Existence test. */
+	/* No permission to check.  Existence test. */
+	if (!mask)
 		return 0;
-	}
 
-	return inode_has_perm(cred, inode,
-			      file_mask_to_av(inode->i_mode, mask), NULL);
+	COMMON_AUDIT_DATA_INIT(&ad, FS);
+	ad.u.fs.inode = inode;
+
+	if (from_access)
+		ad.selinux_audit_data.auditdeny |= FILE__AUDIT_ACCESS;
+
+	perms = file_mask_to_av(inode->i_mode, mask);
+
+	return inode_has_perm(cred, inode, perms, &ad);
 }
 
 static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h
index 8b32e959bb2e..d64603e10dbe 100644
--- a/security/selinux/include/classmap.h
+++ b/security/selinux/include/classmap.h
@@ -2,7 +2,7 @@
     "getattr", "setattr", "lock", "relabelfrom", "relabelto", "append"
 
 #define COMMON_FILE_PERMS COMMON_FILE_SOCK_PERMS, "unlink", "link", \
-    "rename", "execute", "swapon", "quotaon", "mounton"
+    "rename", "execute", "swapon", "quotaon", "mounton", "audit_access"
 
 #define COMMON_SOCK_PERMS COMMON_FILE_SOCK_PERMS, "bind", "connect", \
     "listen", "accept", "getopt", "setopt", "shutdown", "recvfrom",  \