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random-util: if zero random bytes are requested we can always fulfill the request

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This commit is contained in:
Lennart Poettering 2018-11-07 19:14:47 +01:00
parent 68534345b8
commit 776cf7461f
1 changed files with 3 additions and 0 deletions
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src/basic/random-util.c
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@ -76,6 +76,9 @@ int genuine_random_bytes(void *p, size_t n, RandomFlags flags) {
* the random pool is fully initialized or not. Otherwise, it will return success if at least some random
* bytes were successfully acquired, and an error if the kernel has no entropy whatsover for us. */
if (n == 0)
return 0;
/* Use the getrandom() syscall unless we know we don't have it. */
if (have_syscall != 0 && !HAS_FEATURE_MEMORY_SANITIZER) {