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random: add get_random_{bytes,u32,u64,int,long,once}_wait family

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These functions are simple convenience wrappers that call
wait_for_random_bytes before calling the respective get_random_*
function.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jason A. Donenfeld 2017-06-07 20:05:02 -04:00 • committed by Theodore Ts'o
parent e297a783e4
commit da9ba564bd
3 changed files with 29 additions and 0 deletions
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25
include/linux/random.h
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@ -58,6 +58,31 @@ static inline unsigned long get_random_long(void)
#endif
}
/* Calls wait_for_random_bytes() and then calls get_random_bytes(buf, nbytes).
* Returns the result of the call to wait_for_random_bytes. */
static inline int get_random_bytes_wait(void *buf, int nbytes)
{
int ret = wait_for_random_bytes();
if (unlikely(ret))
return ret;
get_random_bytes(buf, nbytes);
return 0;
}
#define declare_get_random_var_wait(var) \
static inline int get_random_ ## var ## _wait(var *out) { \
int ret = wait_for_random_bytes(); \
if (unlikely(ret)) \
return ret; \
*out = get_random_ ## var(); \
return 0; \
}
declare_get_random_var_wait(u32)
declare_get_random_var_wait(u64)
declare_get_random_var_wait(int)
declare_get_random_var_wait(long)
#undef declare_get_random_var
unsigned long randomize_page(unsigned long start, unsigned long range);
u32 prandom_u32(void);