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authorTheodore Ts'o <tytso@mit.edu>2013-11-03 18:24:08 -0500
committerTheodore Ts'o <tytso@mit.edu>2013-11-03 18:24:08 -0500
commit392a546dc8368d1745f9891ef3f8f7c380de8650 (patch)
treec579d07d0c4bbece97f98181fea741afbd268244 /drivers/char/random.c
parent644008df899ec252e78db28c1b6d6b86779aada8 (diff)
random: add debugging code to detect early use of get_random_bytes()
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'drivers/char/random.c')
-rw-r--r--drivers/char/random.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 0894d86253fd..cdf4cfb2da4d 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -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);
}