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random: always fill buffer in get_random_bytes_wait

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commit 25e3fca492035a2e1d4ac6e3b1edd9c1acd48897 upstream.

In the unfortunate event that a developer fails to check the return
value of get_random_bytes_wait, or simply wants to make a "best effort"
attempt, for whatever that's worth, it's much better to still fill the
buffer with _something_ rather than catastrophically failing in the case
of an interruption. This is both a defense in depth measure against
inevitable programming bugs, as well as a means of making the API a bit
more useful.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason A. Donenfeld 2018-02-04 23:07:46 +01:00 committed by Greg Kroah-Hartman
parent 63c60b6a3e
commit 1e8f4f59a0
1 changed files with 1 additions and 3 deletions
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4
include/linux/random.h
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@ -63,10 +63,8 @@ static inline unsigned long get_random_long(void)
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;
return ret;
}
#define declare_get_random_var_wait(var) \