Add support for getrandom()
diff --git a/ChangeLog b/ChangeLog
index fd83b9e..34e9d27 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
PolarSSL ChangeLog (Sorted per branch, date)
+= PolarSSL 1.3.10 released ???
+
+Features
+ * Add support for getrandom() syscall on recent Linux kernels with Glibc or
+ a compatible enough libc (eg uClibc).
+
= PolarSSL 1.3.9 released 2014-10-20
Security
* Lowest common hash was selected from signature_algorithms extension in
diff --git a/library/entropy_poll.c b/library/entropy_poll.c
index 9ca9e95..33e75bc 100644
--- a/library/entropy_poll.c
+++ b/library/entropy_poll.c
@@ -73,6 +73,43 @@
}
#else /* _WIN32 && !EFIX64 && !EFI32 */
+/*
+ * Test for Linux getrandom() support.
+ * Since there is no wrapper in the libc yet, use the generic syscall wrapper
+ * available in GNU libc and compatible libc's (eg uClibc).
+ */
+#if defined(__linux__) && defined(__GLIBC__)
+#include <linux/version.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#if defined(SYS_getrandom)
+#define HAVE_GETRANDOM
+static int getrandom_wrapper( void *buf, size_t buflen, unsigned int flags )
+{
+ return( syscall( SYS_getrandom, buf, buflen, flags ) );
+}
+#endif /* SYS_getrandom */
+#endif /* __linux__ */
+
+#if defined(HAVE_GETRANDOM)
+
+#include <errno.h>
+
+int platform_entropy_poll( void *data,
+ unsigned char *output, size_t len, size_t *olen )
+{
+ int ret;
+ ((void) data);
+
+ if( ( ret = getrandom_wrapper( output, len, 0 ) ) < 0 )
+ return( POLARSSL_ERR_ENTROPY_SOURCE_FAILED );
+
+ *olen = ret;
+ return( 0 );
+}
+
+#else /* HAVE_GETRANDOM */
+
#include <stdio.h>
int platform_entropy_poll( void *data,
@@ -100,6 +137,7 @@
return( 0 );
}
+#endif /* HAVE_GETRANDOM */
#endif /* _WIN32 && !EFIX64 && !EFI32 */
#endif /* !POLARSSL_NO_PLATFORM_ENTROPY */
