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random: add debugging code to detect early use of get_random_bytes() 

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2013-11-03 18:24:08 -05:00
parent 644008df89
commit 392a546dc8
1 changed files with 9 additions and 0 deletions
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9
drivers/char/random.c
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@ -280,6 +280,8 @@
#define SEC_XFER_SIZE 512 #define SEC_XFER_SIZE 512
#define EXTRACT_SIZE 10 #define EXTRACT_SIZE 10
#define DEBUG_RANDOM_BOOT 0
#define LONGS(x) (((x) + sizeof(unsigned long) - 1)/sizeof(unsigned long)) #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) 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_); trace_get_random_bytes(nbytes, _RET_IP_);
extract_entropy(&nonblocking_pool, buf, nbytes, 0, 0); extract_entropy(&nonblocking_pool, buf, nbytes, 0, 0);
} }