#!/usr/bin/perl -w
#
use strict;
use Math::BigInt;
use Fcntl "SEEK_SET";

die "Format: $0 [-s <systemmap-file>] <vmlinux-file> <keyring-file>\n"
    if ($#ARGV != 1 && $#ARGV != 3 ||
	$#ARGV == 3 && $ARGV[0] ne "-s");

my $sysmap = "";
if ($#ARGV == 3) {
    shift;
    $sysmap = $ARGV[0];
    shift;
}

my $vmlinux = $ARGV[0];
my $keyring = $ARGV[1];

#
# Parse the vmlinux section table
#
open FD, "objdump -h $vmlinux |" || die $vmlinux;
my @lines = <FD>;
close(FD) || die $vmlinux;

my @sections = ();

foreach my $line (@lines) {
    chomp($line);
    if ($line =~ /\s*([0-9]+)\s+(\S+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+2[*][*]([0-9]+)/
	) {
	my $seg  = $1;
	my $name = $2;
	my $len  = Math::BigInt->new("0x" . $3);
	my $vma  = Math::BigInt->new("0x" . $4);
	my $lma  = Math::BigInt->new("0x" . $5);
	my $foff = Math::BigInt->new("0x" . $6);
	my $align = 2 ** $7;

	push @sections, { name => $name,
			  vma => $vma,
			  len => $len,
			  foff => $foff };
    }
}

print "Have $#sections sections\n";

#
# Try and parse the vmlinux symbol table.  If the vmlinux file has been created
# from a vmlinuz file with extract-vmlinux then the symbol table will be empty.
#
open FD, "nm $vmlinux 2>/dev/null |" || die $vmlinux;
@lines = <FD>;
close(FD) || die $vmlinux;

my %symbols = ();
my $nr_symbols = 0;

sub parse_symbols(@) {
    foreach my $line (@_) {
	chomp($line);
	if ($line =~ /([0-9a-f]+)\s([a-zA-Z])\s(\S+)/
	    ) {
	    my $addr = "0x" . $1;
	    my $type = $2;
	    my $name = $3;

	    $symbols{$name} = $addr;
	    $nr_symbols++;
	}
    }
}
parse_symbols(@lines);

if ($nr_symbols == 0 && $sysmap ne "") {
    print "No symbols in vmlinux, trying $sysmap\n";

    open FD, "<$sysmap" || die $sysmap;
    @lines = <FD>;
    close(FD) || die $sysmap;
    parse_symbols(@lines);
}

die "No symbols available\n"
    if ($nr_symbols == 0);

print "Have $nr_symbols symbols\n";

die "Can't find system certificate list"
    unless (exists($symbols{"__cert_list_start"}) &&
	    exists($symbols{"system_certificate_list_size"}));

my $start = Math::BigInt->new($symbols{"__cert_list_start"});
my $end;
my $size;
my $size_sym = Math::BigInt->new($symbols{"system_certificate_list_size"});

open FD, "<$vmlinux" || die $vmlinux;
binmode(FD);

my $s = undef;
foreach my $sec (@sections) {
    my $s_name = $sec->{name};
    my $s_vma = $sec->{vma};
    my $s_len = $sec->{len};
    my $s_foff = $sec->{foff};
    my $s_vend = $s_vma + $s_len;

    next unless ($start >= $s_vma);
    next if ($start >= $s_vend);

    die "Certificate list size was not found on the same section\n"
	if ($size_sym < $s_vma || $size_sym > $s_vend);

    die "Cert object in multiple sections: ", $s_name, " and ", $s->{name}, "\n"
	if ($s);

    my $size_off = $size_sym -$s_vma + $s_foff;
    my $packed;
    die $vmlinux if (!defined(sysseek(FD, $size_off, SEEK_SET)));
    sysread(FD, $packed, 8);
    $size = unpack 'L!', $packed;
    $end = $start + $size;

    printf "Have %u bytes of certs at VMA 0x%x\n", $size, $start;

    die "Cert object partially overflows section $s_name\n"
	if ($end > $s_vend);

    $s = $sec;
}

die "Cert object not inside a section\n"
    unless ($s);

print "Certificate list in section ", $s->{name}, "\n";

my $foff = $start - $s->{vma} + $s->{foff};

printf "Certificate list at file offset 0x%x\n", $foff;

die $vmlinux if (!defined(sysseek(FD, $foff, SEEK_SET)));
my $buf = "";
my $len = sysread(FD, $buf, $size);
die "$vmlinux" if (!defined($len));
die "Short read on $vmlinux\n" if ($len != $size);
close(FD) || die $vmlinux;

open FD, ">$keyring" || die $keyring;
binmode(FD);
$len = syswrite(FD, $buf, $size);
die "$keyring" if (!defined($len));
die "Short write on $keyring\n" if ($len != $size);
close(FD) || die $keyring;
'>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>Benjamin Herrenschmidt &lt;benh@kernel.crashing.org&gt;</td><td class='right'>2017-02-03 17:10:28 +1100</td></tr>
<tr><th>committer</th><td>Michael Ellerman &lt;mpe@ellerman.id.au&gt;</td><td class='right'>2017-02-08 23:36:29 +1100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/tegra/tegra_wm8753.c?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>d7df2443cd5f67fc6ee7c05a88e4996e8177f91b</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/soc/tegra/tegra_wm8753.c?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>098a7c0ca4fceb8a65cb1f693c9d71990388933d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/tegra/tegra_wm8753.c?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>sound/soc/tegra/tegra_wm8753.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/tegra/tegra_wm8753.c?id=a0615a16f7d0ceb5804d295203c302d496d8ee91'>a0615a16f7d0ceb5804d295203c302d496d8ee91</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/tegra/tegra_wm8753.c?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b&amp;id2=a0615a16f7d0ceb5804d295203c302d496d8ee91'>diff</a>)</td></tr></table>
<div class='commit-subject'>powerpc/mm: Fix spurrious segfaults on radix with autonuma</div><div class='commit-msg'>When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it
clears all the protection bits but leave the PTE valid.

With the Radix MMU, an attempt at executing from such a PTE will
take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G".

It is thus incorrect to treat all such faults as errors. We should
pass them to handle_mm_fault() for autonuma to deal with. The case
of pages that are really not executable is handled by the existing
test for VM_EXEC further down.

That leaves us with catching the kernel attempts at executing user
pages. We can catch that earlier, even before we do find_vma.

It is never valid on powerpc for the kernel to take an exec fault
to begin with. So fold that test with the existing test for the
kernel faulting on kernel addresses to bail out early.

Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report")
Signed-off-by: Benjamin Herrenschmidt &lt;benh@kernel.crashing.org&gt;
Reviewed-by: Aneesh Kumar K.V &lt;aneesh.kumar@linux.vnet.ibm.com&gt;
Acked-by: Balbir Singh &lt;bsingharora@gmail.com&gt;
Signed-off-by: Michael Ellerman &lt;mpe@ellerman.id.au&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>Diffstat</a> (limited to 'sound/soc/tegra/tegra_wm8753.c')</div><table summary='diffstat' class='diffstat'>