DSA mod inverse fix

[openssl.git] / crypto / uid.c

diff --git a/crypto/uid.c b/crypto/uid.c
index 9756d518505c5a813d1195e40304ac6471a67a5d..f7ae2610b3607d80997dfa166d64060ad90ed5fe 100644 (file)
--- a/crypto/uid.c
+++ b/crypto/uid.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
@@ -19,7 +19,7 @@ int OPENSSL_issetugid(void)
     return issetugid();
 }
 
-#elif defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VXWORKS)
+#elif defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI)
 
 int OPENSSL_issetugid(void)
 {
@@ -31,12 +31,18 @@ int OPENSSL_issetugid(void)
 # include OPENSSL_UNISTD
 # include <sys/types.h>
 
+# if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
+#  if __GLIBC_PREREQ(2, 16)
+#   include <sys/auxv.h>
+#  endif
+# endif
+
 int OPENSSL_issetugid(void)
 {
-    if (getuid() != geteuid())
-        return 1;
-    if (getgid() != getegid())
-        return 1;
-    return 0;
+# ifdef AT_SECURE
+    return getauxval(AT_SECURE) != 0;
+# else
+    return getuid() != geteuid() || getgid() != getegid();
+# endif
 }
 #endif