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-rw-r--r--scripts/gcc-plugins/latent_entropy_plugin.c44
1 files changed, 27 insertions, 17 deletions
diff --git a/scripts/gcc-plugins/latent_entropy_plugin.c b/scripts/gcc-plugins/latent_entropy_plugin.c
index 589454bce930..8425da41de0d 100644
--- a/scripts/gcc-plugins/latent_entropy_plugin.c
+++ b/scripts/gcc-plugins/latent_entropy_plugin.c
@@ -86,25 +86,31 @@ static struct plugin_info latent_entropy_plugin_info = {
.help = "disable\tturn off latent entropy instrumentation\n",
};
-static unsigned HOST_WIDE_INT seed;
-/*
- * get_random_seed() (this is a GCC function) generates the seed.
- * This is a simple random generator without any cryptographic security because
- * the entropy doesn't come from here.
- */
+static unsigned HOST_WIDE_INT deterministic_seed;
+static unsigned HOST_WIDE_INT rnd_buf[32];
+static size_t rnd_idx = ARRAY_SIZE(rnd_buf);
+static int urandom_fd = -1;
+
static unsigned HOST_WIDE_INT get_random_const(void)
{
- unsigned int i;
- unsigned HOST_WIDE_INT ret = 0;
-
- for (i = 0; i < 8 * sizeof(ret); i++) {
- ret = (ret << 1) | (seed & 1);
- seed >>= 1;
- if (ret & 1)
- seed ^= 0xD800000000000000ULL;
+ if (deterministic_seed) {
+ unsigned HOST_WIDE_INT w = deterministic_seed;
+ w ^= w << 13;
+ w ^= w >> 7;
+ w ^= w << 17;
+ deterministic_seed = w;
+ return deterministic_seed;
}
- return ret;
+ if (urandom_fd < 0) {
+ urandom_fd = open("/dev/urandom", O_RDONLY);
+ gcc_assert(urandom_fd >= 0);
+ }
+ if (rnd_idx >= ARRAY_SIZE(rnd_buf)) {
+ gcc_assert(read(urandom_fd, rnd_buf, sizeof(rnd_buf)) == sizeof(rnd_buf));
+ rnd_idx = 0;
+ }
+ return rnd_buf[rnd_idx++];
}
static tree tree_get_random_const(tree type)
@@ -537,8 +543,6 @@ static void latent_entropy_start_unit(void *gcc_data __unused,
tree type, id;
int quals;
- seed = get_random_seed(false);
-
if (in_lto_p)
return;
@@ -573,6 +577,12 @@ __visible int plugin_init(struct plugin_name_args *plugin_info,
const struct plugin_argument * const argv = plugin_info->argv;
int i;
+ /*
+ * Call get_random_seed() with noinit=true, so that this returns
+ * 0 in the case where no seed has been passed via -frandom-seed.
+ */
+ deterministic_seed = get_random_seed(true);
+
static const struct ggc_root_tab gt_ggc_r_gt_latent_entropy[] = {
{
.base = &latent_entropy_decl,