Support for older kernels

[Florian Weimer <fweimer@xxxxxxxxxx>]

Do we need to support running current Fedora releases in kernels which 
are older than the initial Fedora kernel for that release?

If yes, what are the kernel baselines?  We can go back to releases 
earlier than 3.2 on most architectures because that's the current glibc 
baseline (except x86_64 and i386, where the glibc baseline is 2.6.32).

I'm asking because I noticed this code in older kernels:

/** Generates a random vector of AUTH_VECTOR_LEN octets
 *
 * @param vector a buffer with at least %AUTH_VECTOR_LEN bytes.
 */
static void rc_random_vector(unsigned char *vector)
{
        int randno;
        int i;
#if defined(HAVE_GETENTROPY)
        if (getentropy(vector, AUTH_VECTOR_LEN) >= 0) {
                return;
        }                       /* else fall through */
#elif defined(HAVE_DEV_URANDOM)
…
#endif
 fallback:
        for (i = 0; i < AUTH_VECTOR_LEN;) {
                randno = random();
                memcpy((char *)vector, (char *)&randno, sizeof(int));
                vector += sizeof(int);
                i += sizeof(int);
        }

        return;
}

getentropy returns ENOSYS if the kernel is too old to support the 
underyling system call, and this code falls back to predictable 
randomness in this case.

Thanks,
Florian
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