#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include "rnd.h"
#include "die.h"
#include "ioexact.h"
#include "ioops.h"

static int fdw = -1;

static void randombytes_weak(unsigned char *x, size_t xlen)
{
	int ret;

	if (fdw == -1) {
		for (;;) {
			fdw = open(LOW_ENTROPY_SOURCE, O_RDONLY);
			if (fdw != -1)
				break;
			sleep(1);
		}
	}

	while (xlen > 0) {
		if (xlen < 1048576)
			ret = xlen;
		else
			ret = 1048576;

		ret = read(fdw, x, ret);
		if (ret < 1) {
			sleep(1);
			continue;
		}

		x += ret;
		xlen -= ret;
	}
}

static void randombytes_strong(unsigned char *x, size_t xlen)
{
	int fds, ret;

	fds = open_or_die(HIG_ENTROPY_SOURCE, O_RDONLY);

	ret = read_exact(fds, x, xlen, 0);
	if (ret != (int) xlen)
		panic("Error reading from entropy source!\n");

	close(fds);
}

int secrand(void)
{
	int ret;

	randombytes_weak((void *) &ret, sizeof(ret));

	return ret;
}

void gen_key_bytes(unsigned char *area, size_t len)
{
	randombytes_strong(area, len);
}
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<tr><th>author</th><td>Martin Schwidefsky &lt;schwidefsky@de.ibm.com&gt;</td><td class='right'>2016-06-27 17:06:45 +0200</td></tr>
<tr><th>committer</th><td>Martin Schwidefsky &lt;schwidefsky@de.ibm.com&gt;</td><td class='right'>2016-06-28 09:24:28 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=bcf4dd5f9ee096bd1510f838dd4750c35df4e38b'>bcf4dd5f9ee096bd1510f838dd4750c35df4e38b</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=bcf4dd5f9ee096bd1510f838dd4750c35df4e38b'>patch</a>)</td></tr>
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<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=5419447e2142d6ed68c9f5c1a28630b3a290a845'>5419447e2142d6ed68c9f5c1a28630b3a290a845</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=bcf4dd5f9ee096bd1510f838dd4750c35df4e38b&amp;id2=5419447e2142d6ed68c9f5c1a28630b3a290a845'>diff</a>)</td></tr></table>
<div class='commit-subject'>s390: fix test_fp_ctl inline assembly contraints</div><div class='commit-msg'>The test_fp_ctl function is used to test if a given value is a valid
floating-point control. The inline assembly in test_fp_ctl uses an
incorrect constraint for the 'orig_fpc' variable. If the compiler
chooses the same register for 'fpc' and 'orig_fpc' the test_fp_ctl()
function always returns true. This allows user space to trigger
kernel oopses with invalid floating-point control values on the
signal stack.

This problem has been introduced with git commit 4725c86055f5bbdcdf
"s390: fix save and restore of the floating-point-control register"

Cc: stable@vger.kernel.org # v3.13+
Reviewed-by: Heiko Carstens &lt;heiko.carstens@de.ibm.com&gt;
Signed-off-by: Martin Schwidefsky &lt;schwidefsky@de.ibm.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=bcf4dd5f9ee096bd1510f838dd4750c35df4e38b'>Diffstat</a></div><table summary='diffstat' class='diffstat'>