diff options
| -rw-r--r-- | lib/libc/gen/arc4random.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/libc/gen/arc4random.c b/lib/libc/gen/arc4random.c index 1c7dead..56e457b 100644 --- a/lib/libc/gen/arc4random.c +++ b/lib/libc/gen/arc4random.c @@ -256,7 +256,11 @@ arc4random_uniform(u_int32_t upper_bound) u_int32_t r, min; if (upper_bound < 2) - return 0; + return (0); + + /* Detect simple power of two case */ + if ((upper_bound & -upper_bound) == upper_bound) + return (arc4random() % upper_bound); #if (ULONG_MAX > 0xffffffffUL) min = 0x100000000UL % upper_bound; |
