/*
 * Copyright 2014, Michael Ellerman, IBM Corp.
 * Licensed under GPLv2.
 */

#define _GNU_SOURCE	/* For CPU_ZERO etc. */

#include <errno.h>
#include <sched.h>
#include <setjmp.h>
#include <stdlib.h>
#include <sys/wait.h>

#include "utils.h"
#include "lib.h"


int bind_to_cpu(int cpu)
{
	cpu_set_t mask;

	printf("Binding to cpu %d\n", cpu);

	CPU_ZERO(&mask);
	CPU_SET(cpu, &mask);

	return sched_setaffinity(0, sizeof(mask), &mask);
}

#define PARENT_TOKEN	0xAA
#define CHILD_TOKEN	0x55

int sync_with_child(union pipe read_pipe, union pipe write_pipe)
{
	char c = PARENT_TOKEN;

	FAIL_IF(write(write_pipe.write_fd, &c, 1) != 1);
	FAIL_IF(read(read_pipe.read_fd, &c, 1) != 1);
	if (c != CHILD_TOKEN) /* sometimes expected */
		return 1;

	return 0;
}

int wait_for_parent(union pipe read_pipe)
{
	char c;

	FAIL_IF(read(read_pipe.read_fd, &c, 1) != 1);
	FAIL_IF(c != PARENT_TOKEN);

	return 0;
}

int notify_parent(union pipe write_pipe)
{
	char c = CHILD_TOKEN;

	FAIL_IF(write(write_pipe.write_fd, &c, 1) != 1);

	return 0;
}

int notify_parent_of_error(union pipe write_pipe)
{
	char c = ~CHILD_TOKEN;

	FAIL_IF(write(write_pipe.write_fd, &c, 1) != 1);

	return 0;
}

int wait_for_child(pid_t child_pid)
{
	int rc;

	if (waitpid(child_pid, &rc, 0) == -1) {
		perror("waitpid");
		return 1;
	}

	if (WIFEXITED(rc))
		rc = WEXITSTATUS(rc);
	else
		rc = 1; /* Signal or other */

	return rc;
}

int kill_child_and_wait(pid_t child_pid)
{
	kill(child_pid, SIGTERM);

	return wait_for_child(child_pid);
}

static int eat_cpu_child(union pipe read_pipe, union pipe write_pipe)
{
	volatile int i = 0;

	/*
	 * We are just here to eat cpu and die. So make sure we can be killed,
	 * and also don't do any custom SIGTERM handling.
	 */
	signal(SIGTERM, SIG_DFL);

	notify_parent(write_pipe);
	wait_for_parent(read_pipe);

	/* Soak up cpu forever */
	while (1) i++;

	return 0;
}

pid_t eat_cpu(int (test_function)(void))
{
	union pipe read_pipe, write_pipe;
	int cpu, rc;
	pid_t pid;

	cpu = pick_online_cpu();
	FAIL_IF(cpu < 0);
	FAIL_IF(bind_to_cpu(cpu));

	if (pipe(read_pipe.fds) == -1)
		return -1;

	if (pipe(write_pipe.fds) == -1)
		return -1;

	pid = fork();
	if (pid == 0)
		exit(eat_cpu_child(write_pipe, read_pipe));

	if (sync_with_child(read_pipe, write_pipe)) {
		rc = -1;
		goto out;
	}

	printf("main test running as pid %d\n", getpid());

	rc = test_function();
out:
	kill(pid, SIGKILL);

	return rc;
}

struct addr_range libc, vdso;

int parse_proc_maps(void)
{
	unsigned long start, end;
	char execute, name[128];
	FILE *f;
	int rc;

	f = fopen("/proc/self/maps", "r");
	if (!f) {
		perror("fopen");
		return -1;
	}

	do {
		/* This skips line with no executable which is what we want */
		rc = fscanf(f, "%lx-%lx %*c%*c%c%*c %*x %*d:%*d %*d %127s\n",
			    &start, &end, &execute, name);
		if (rc <= 0)
			break;

		if (execute != 'x')
			continue;

		if (strstr(name, "libc")) {
			libc.first = start;
			libc.last = end - 1;
		} else if (strstr(name, "[vdso]")) {
			vdso.first = start;
			vdso.last = end - 1;
		}
	} while(1);

	fclose(f);

	return 0;
}

#define PARANOID_PATH	"/proc/sys/kernel/perf_event_paranoid"

bool require_paranoia_below(int level)
{
	long current;
	char *end, buf[16];
	FILE *f;
	bool rc;

	rc = false;

	f = fopen(PARANOID_PATH, "r");
	if (!f) {
		perror("fopen");
		goto out;
	}

	if (!fgets(buf, sizeof(buf), f)) {
		printf("Couldn't read " PARANOID_PATH "?\n");
		goto out_close;
	}

	current = strtol(buf, &end, 10);

	if (end == buf) {
		printf("Couldn't parse " PARANOID_PATH "?\n");
		goto out_close;
	}

	if (current >= level)
		goto out_close;

	rc = true;
out_close:
	fclose(f);
out:
	return rc;
}

fccf2eb0cc8d8082f65c0a4286'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Laura Abbott &lt;labbott@redhat.com&gt;</td><td class='right'>2016-12-21 12:32:54 -0800</td></tr>
<tr><th>committer</th><td>Herbert Xu &lt;herbert@gondor.apana.org.au&gt;</td><td class='right'>2016-12-27 17:32:11 +0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/powerpc/include?id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>02608e02fbec04fccf2eb0cc8d8082f65c0a4286</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/testing/selftests/powerpc/include?id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>37ff0410d130cfe77185f591b07cd6403f207f0c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/testing/selftests/powerpc/include?id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>tools/testing/selftests/powerpc/include</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/testing/selftests/powerpc/include?id=7ce7d89f48834cefece7804d38fc5d85382edf77'>7ce7d89f48834cefece7804d38fc5d85382edf77</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/testing/selftests/powerpc/include?id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286&amp;id2=7ce7d89f48834cefece7804d38fc5d85382edf77'>diff</a>)</td></tr></table>
<div class='commit-subject'>crypto: testmgr - Use heap buffer for acomp test input</div><div class='commit-msg'>Christopher Covington reported a crash on aarch64 on recent Fedora
kernels:

kernel BUG at ./include/linux/scatterlist.h:140!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 2 PID: 752 Comm: cryptomgr_test Not tainted 4.9.0-11815-ge93b1cc #162
Hardware name: linux,dummy-virt (DT)
task: ffff80007c650080 task.stack: ffff800008910000
PC is at sg_init_one+0xa0/0xb8
LR is at sg_init_one+0x24/0xb8
...
[&lt;ffff000008398db8&gt;] sg_init_one+0xa0/0xb8
[&lt;ffff000008350a44&gt;] test_acomp+0x10c/0x438
[&lt;ffff000008350e20&gt;] alg_test_comp+0xb0/0x118
[&lt;ffff00000834f28c&gt;] alg_test+0x17c/0x2f0
[&lt;ffff00000834c6a4&gt;] cryptomgr_test+0x44/0x50
[&lt;ffff0000080dac70&gt;] kthread+0xf8/0x128
[&lt;ffff000008082ec0&gt;] ret_from_fork+0x10/0x50

The test vectors used for input are part of the kernel image. These
inputs are passed as a buffer to sg_init_one which eventually blows up
with BUG_ON(!virt_addr_valid(buf)). On arm64, virt_addr_valid returns
false for the kernel image since virt_to_page will not return the
correct page. Fix this by copying the input vectors to heap buffer
before setting up the scatterlist.

Reported-by: Christopher Covington &lt;cov@codeaurora.org&gt;
Fixes: d7db7a882deb ("crypto: acomp - update testmgr with support for acomp")
Signed-off-by: Laura Abbott &lt;labbott@redhat.com&gt;
Signed-off-by: Herbert Xu &lt;herbert@gondor.apana.org.au&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=02608e02fbec04fccf2eb0cc8d8082f65c0a4286'>Diffstat</a> (limited to 'tools/testing/selftests/powerpc/include')</div><table summary='diffstat' class='diffstat'>