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authorDenys Vlasenko2022-04-27 17:20:43 +0200
committerDenys Vlasenko2022-04-27 17:20:43 +0200
commit401356511c5de3b5a88fdd3ac4977e19b82babf5 (patch)
treefe73944c41d4cc00482bb3e09f300f3d3eb0ec01 /util-linux
parent6da9947358276d989e002c3c5c8ff2e33676ae21 (diff)
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busybox-401356511c5de3b5a88fdd3ac4977e19b82babf5.tar.gz
seedrng: remove unnecessary zero-filling of local variables
function old new delta seedrng_main 1292 1273 -19 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'util-linux')
-rw-r--r--util-linux/seedrng.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/util-linux/seedrng.c b/util-linux/seedrng.c
index c762e9e..dd082ea 100644
--- a/util-linux/seedrng.c
+++ b/util-linux/seedrng.c
@@ -54,20 +54,23 @@
#define CREDITABLE_SEED_NAME "seed.credit"
#define NON_CREDITABLE_SEED_NAME "seed.no-credit"
-enum seedrng_lengths {
+enum {
MIN_SEED_LEN = SHA256_OUTSIZE,
MAX_SEED_LEN = 512
};
static size_t determine_optimal_seed_len(void)
{
- char poolsize_str[11] = { 0 };
- unsigned long poolsize;
+ char poolsize_str[12];
+ unsigned poolsize;
+ int n;
- if (open_read_close("/proc/sys/kernel/random/poolsize", poolsize_str, sizeof(poolsize_str) - 1) < 0) {
+ n = open_read_close("/proc/sys/kernel/random/poolsize", poolsize_str, sizeof(poolsize_str) - 1);
+ if (n < 0) {
bb_perror_msg("unable to determine pool size, assuming %u bits", MIN_SEED_LEN * 8);
return MIN_SEED_LEN;
}
+ poolsize_str[n] = '\0';
poolsize = (bb_strtoul(poolsize_str, NULL, 10) + 7) / 8;
return MAX(MIN(poolsize, MAX_SEED_LEN), MIN_SEED_LEN);
}
@@ -159,7 +162,7 @@ static int seed_from_file_if_exists(const char *filename, int dfd, bool credit,
int seedrng_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE;
int seedrng_main(int argc UNUSED_PARAM, char *argv[])
{
- const char *seed_dir = DEFAULT_SEED_DIR, *creditable_seed, *non_creditable_seed;
+ const char *seed_dir, *creditable_seed, *non_creditable_seed;
int fd, dfd, program_ret = 0;
uint8_t new_seed[MAX_SEED_LEN];
size_t new_seed_len;
@@ -178,10 +181,8 @@ int seedrng_main(int argc UNUSED_PARAM, char *argv[])
;
#endif
+ seed_dir = DEFAULT_SEED_DIR;
skip_credit = getopt32long(argv, "d:n", longopts, &seed_dir) & OPT_n;
- creditable_seed = concat_path_file(seed_dir, CREDITABLE_SEED_NAME);
- non_creditable_seed = concat_path_file(seed_dir, NON_CREDITABLE_SEED_NAME);
-
umask(0077);
if (getuid())
bb_simple_error_msg_and_die(bb_msg_you_must_be_root);
@@ -200,6 +201,8 @@ int seedrng_main(int argc UNUSED_PARAM, char *argv[])
clock_gettime(CLOCK_BOOTTIME, &timestamp);
sha256_hash(&hash, &timestamp, sizeof(timestamp));
+ creditable_seed = concat_path_file(seed_dir, CREDITABLE_SEED_NAME);
+ non_creditable_seed = concat_path_file(seed_dir, NON_CREDITABLE_SEED_NAME);
for (int i = 1; i < 3; ++i) {
if (seed_from_file_if_exists(i == 1 ? non_creditable_seed : creditable_seed,
dfd, i == 1 ? false : !skip_credit, &hash) < 0)