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crypto: jitterentropy - use ktime_get_ns as fallback

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As part of the Y2038 development, __getnstimeofday is not supposed to be
used any more. It is now replaced with ktime_get_ns. The Jitter RNG uses
the time stamp to measure the execution time of a given code path and
tries to detect variations in the execution time. Therefore, the only
requirement the Jitter RNG has, is a sufficient high resolution to
detect these variations.

The change was tested on x86 to show an identical behavior as RDTSC. The
used test code simply measures the execution time of the heart of the
RNG:

        jent_get_nstime(&time);
        jent_memaccess(ec, min);
        jent_fold_time(NULL, time, &folded, min);
        jent_get_nstime(&time2);
        return ((time2 - time));

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Stephan Mueller 2016-06-22 19:26:06 +02:00 committed by Herbert Xu
parent d56d72c6a0
commit b578456c34
1 changed files with 13 additions and 9 deletions
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22
crypto/jitterentropy-kcapi.c
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@ -87,24 +87,28 @@ void jent_memcpy(void *dest, const void *src, unsigned int n)
memcpy(dest, src, n);
}
/*
* Obtain a high-resolution time stamp value. The time stamp is used to measure
* the execution time of a given code path and its variations. Hence, the time
* stamp must have a sufficiently high resolution.
*
* Note, if the function returns zero because a given architecture does not
* implement a high-resolution time stamp, the RNG code's runtime test
* will detect it and will not produce output.
*/
void jent_get_nstime(__u64 *out)
{
struct timespec ts;
__u64 tmp = 0;
tmp = random_get_entropy();
/*
* If random_get_entropy does not return a value (which is possible on,
* for example, MIPS), invoke __getnstimeofday
* If random_get_entropy does not return a value, i.e. it is not
* implemented for a given architecture, use a clock source.
* hoping that there are timers we can work with.
*/
if ((0 == tmp) &&
(0 == __getnstimeofday(&ts))) {
tmp = ts.tv_sec;
tmp = tmp << 32;
tmp = tmp | ts.tv_nsec;
}
if (tmp == 0)
tmp = ktime_get_ns();
*out = tmp;
}