random: add debugging code to detect early use of get_random_bytes() (392a546d) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/char/random.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -280,6 +280,8 @@
		#define SEC_XFER_SIZE 512
		#define EXTRACT_SIZE 10

		#define DEBUG_RANDOM_BOOT 0

		#define LONGS(x) (((x) + sizeof(unsigned long) - 1)/sizeof(unsigned long))

		/*
		@@ -1177,6 +1179,13 @@ static ssize_t extract_entropy_user(struct entropy_store r, void __user buf,
		*/
		void get_random_bytes(void *buf, int nbytes)
		{
		#if DEBUG_RANDOM_BOOT > 0
		if (unlikely(nonblocking_pool.initialized == 0))
		printk(KERN_NOTICE "random: %pF get_random_bytes called "
		"with %d bits of entropy available\n",
		(void *) _RET_IP_,
		nonblocking_pool.entropy_total);
		#endif
		trace_get_random_bytes(nbytes, _RET_IP_);
		extract_entropy(&nonblocking_pool, buf, nbytes, 0, 0);
		}