[Qemu-devel] [PATCH for-4.1 3/7] linux-user: Use qemu_getrandom for AT_RANDOM

[Richard Henderson]

Use a better interface for random numbers than rand * 16.

Signed-off-by: Richard Henderson <address@hidden>
---
 linux-user/elfload.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index c1a26021f8..f33bf4fb85 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -7,6 +7,7 @@
 #include "qemu.h"
 #include "disas/disas.h"
 #include "qemu/path.h"
+#include "qemu/random.h"
 
 #ifdef _ARCH_PPC64
 #undef ARCH_DLINFO
@@ -1883,12 +1884,9 @@ static abi_ulong create_elf_tables(abi_ulong p, int 
argc, int envc,
     }
 
     /*
-     * Generate 16 random bytes for userspace PRNG seeding (not
-     * cryptically secure but it's not the aim of QEMU).
+     * Generate 16 random bytes for userspace PRNG seeding.
      */
-    for (i = 0; i < 16; i++) {
-        k_rand_bytes[i] = rand();
-    }
+    qemu_getrandom(k_rand_bytes, sizeof(k_rand_bytes), false);
     if (STACK_GROWS_DOWN) {
         sp -= 16;
         u_rand_bytes = sp;
-- 
2.17.1