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From 58cdc09af08e065c85b2f8834ee9848c010f5afe Mon Sep 17 00:00:00 2001
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From: Yu Watanabe <watanabe.yu+github@gmail.com>
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Date: Mon, 16 Dec 2019 19:47:48 +0900
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Subject: [PATCH] random-util: call initialize_srand() after fork()
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(cherry picked from commit a0f11d1d11a546f791855ec9c47c2ff830e6a5aa)
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Related: #2005008
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---
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src/basic/random-util.c | 14 +++++++++++++-
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1 file changed, 13 insertions(+), 1 deletion(-)
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diff --git a/src/basic/random-util.c b/src/basic/random-util.c
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index 91481559db..801f6ad131 100644
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--- a/src/basic/random-util.c
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+++ b/src/basic/random-util.c
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@@ -4,6 +4,7 @@
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/random.h>
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+#include <pthread.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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@@ -26,6 +27,8 @@
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#include "random-util.h"
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#include "time-util.h"
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+static bool srand_called = false;
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+
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int acquire_random_bytes(void *p, size_t n, bool high_quality_required) {
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static int have_syscall = -1;
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@@ -81,8 +84,12 @@ int acquire_random_bytes(void *p, size_t n, bool high_quality_required) {
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return loop_read_exact(fd, (uint8_t*) p + already_done, n - already_done, true);
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}
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+static void clear_srand_initialization(void) {
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+ srand_called = false;
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+}
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+
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void initialize_srand(void) {
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- static bool srand_called = false;
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+ static bool pthread_atfork_registered = false;
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unsigned x;
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#if HAVE_SYS_AUXV_H
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void *auxv;
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@@ -109,6 +116,11 @@ void initialize_srand(void) {
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srand(x);
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srand_called = true;
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+
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+ if (!pthread_atfork_registered) {
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+ (void) pthread_atfork(NULL, NULL, clear_srand_initialization);
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+ pthread_atfork_registered = true;
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+ }
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}
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/* INT_MAX gives us only 31 bits, so use 24 out of that. */
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