/*
 * Userspace test harness for load_unaligned_zeropad. Creates two
 * pages and uses mprotect to prevent access to the second page and
 * a SEGV handler that walks the exception tables and runs the fixup
 * routine.
 *
 * The results are compared against a normal load that is that is
 * performed while access to the second page is enabled via mprotect.
 *
 * Copyright (C) 2014 Anton Blanchard <anton@au.ibm.com>, IBM
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdbool.h>
#include <signal.h>
#include <unistd.h>
#include <sys/mman.h>

#define FIXUP_SECTION ".ex_fixup"

static inline unsigned long __fls(unsigned long x);

#include "word-at-a-time.h"

#include "utils.h"

static inline unsigned long __fls(unsigned long x)
{
	int lz;

	asm (PPC_CNTLZL "%0,%1" : "=r" (lz) : "r" (x));
	return sizeof(unsigned long) - 1 - lz;
}

static int page_size;
static char *mem_region;

static int protect_region(void)
{
	if (mprotect(mem_region + page_size, page_size, PROT_NONE)) {
		perror("mprotect");
		return 1;
	}

	return 0;
}

static int unprotect_region(void)
{
	if (mprotect(mem_region + page_size, page_size, PROT_READ|PROT_WRITE)) {
		perror("mprotect");
		return 1;
	}

	return 0;
}

extern char __start___ex_table[];
extern char __stop___ex_table[];

#if defined(__powerpc64__)
#define UCONTEXT_NIA(UC)	(UC)->uc_mcontext.gp_regs[PT_NIP]
#elif defined(__powerpc__)
#define UCONTEXT_NIA(UC)	(UC)->uc_mcontext.uc_regs->gregs[PT_NIP]
#else
#error implement UCONTEXT_NIA
#endif

struct extbl_entry {
	int insn;
	int fixup;
};

static void segv_handler(int signr, siginfo_t *info, void *ptr)
{
	ucontext_t *uc = (ucontext_t *)ptr;
	unsigned long addr = (unsigned long)info->si_addr;
	unsigned long *ip = &UCONTEXT_NIA(uc);
	struct extbl_entry *entry = (struct extbl_entry *)__start___ex_table;

	while (entry < (struct extbl_entry *)__stop___ex_table) {
		unsigned long insn, fixup;

		insn  = (unsigned long)&entry->insn + entry->insn;
		fixup = (unsigned long)&entry->fixup + entry->fixup;

		if (insn == *ip) {
			*ip = fixup;
			return;
		}
	}

	printf("No exception table match for NIA %lx ADDR %lx\n", *ip, addr);
	abort();
}

static void setup_segv_handler(void)
{
	struct sigaction action;

	memset(&action, 0, sizeof(action));
	action.sa_sigaction = segv_handler;
	action.sa_flags = SA_SIGINFO;
	sigaction(SIGSEGV, &action, NULL);
}

static int do_one_test(char *p, int page_offset)
{
	unsigned long should;
	unsigned long got;

	FAIL_IF(unprotect_region());
	should = *(unsigned long *)p;
	FAIL_IF(protect_region());

	got = load_unaligned_zeropad(p);

	if (should != got) {
		printf("offset %u load_unaligned_zeropad returned 0x%lx, should be 0x%lx\n", page_offset, got, should);
		return 1;
	}

	return 0;
}

static int test_body(void)
{
	unsigned long i;

	page_size = getpagesize();
	mem_region = mmap(NULL, page_size * 2, PROT_READ|PROT_WRITE,
		MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);

	FAIL_IF(mem_region == MAP_FAILED);

	for (i = 0; i < page_size; i++)
		mem_region[i] = i;

	memset(mem_region+page_size, 0, page_size);

	setup_segv_handler();

	for (i = 0; i < page_size; i++)
		FAIL_IF(do_one_test(mem_region+i, i));

	return 0;
}

int main(void)
{
	return test_harness(test_body, "load_unaligned_zeropad");
}
/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>Christoph Hellwig &lt;hch@lst.de&gt;</td><td class='right'>2017-01-30 13:15:41 +0100</td></tr>
<tr><th>committer</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-02-02 10:35:46 -0600</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/core/oss/copy.c?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>dfef358bd1beb4e7b5c94eca944be9cd23dfc752</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/core/oss/copy.c?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>b9a2afb38a4c2ac8ad31f49ec0d71fe9e5b1994c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/core/oss/copy.c?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>sound/core/oss/copy.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/core/oss/copy.c?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>030305d69fc6963c16003f50d7e8d74b02d0a143</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/core/oss/copy.c?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752&amp;id2=030305d69fc6963c16003f50d7e8d74b02d0a143'>diff</a>)</td></tr></table>
<div class='commit-subject'>PCI/MSI: Don't apply affinity if there aren't enough vectors left</div><div class='commit-msg'>Bart reported a problem wіth an out of bounds access in the low-level IRQ
affinity code, which we root caused to the qla2xxx driver assigning all its
MSI-X vectors to the pre and post vectors, and not having any left for the
actually spread IRQs.

Fix this issue by not asking for affinity assignment when there are no
vectors to assign left.

Fixes: 402723ad5c62 ("PCI/MSI: Provide pci_alloc_irq_vectors_affinity()")
Link: https://lkml.kernel.org/r/1485359225.3093.3.camel@sandisk.com
Reported-by: Bart Van Assche &lt;bart.vanassche@sandisk.com&gt;
Tested-by: Bart Van Assche &lt;bart.vanassche@sandisk.com&gt;
Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
Signed-off-by: Bjorn Helgaas &lt;bhelgaas@google.com&gt;</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>Diffstat</a> (limited to 'sound/core/oss/copy.c')</div><table summary='diffstat' class='diffstat'>