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Deal with padding inside .gnu_debuglink section being non-null. Not part of build.

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dbaron@dbaron.org 2008-05-05 14:51:11 -07:00
parent 03afe12e63
commit 36065c96c3
1 changed files with 16 additions and 6 deletions
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22
tools/rb/fix-linux-stack.pl
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@ -36,7 +36,7 @@
#
# ***** END LICENSE BLOCK *****
# $Id: fix-linux-stack.pl,v 1.15 2007/06/20 22:01:17 dbaron%dbaron.org Exp $
# $Id: fix-linux-stack.pl,v 1.16 2008/05/05 21:51:11 dbaron%dbaron.org Exp $
#
# This script uses addr2line (part of binutils) to process the output of
# nsTraceRefcnt's Linux stack walking code. This is useful for two
@ -183,14 +183,24 @@ sub separate_debug_file_for($) {
$hash = ($hash_bytes[0] << 24) | ($hash_bytes[1] << 16) | ($hash_bytes[2] << 8) | $hash_bytes[3];
}
my $old_num = $#chars;
while ($chars[$#chars] eq '00') {
pop @chars;
# The string ends with a null-terminator and then 0 to three bytes
# of padding to fill the current 32-bit unit. (This padding is
# usually null bytes, but I've seen null-null-H, on Ubuntu x86_64.)
my $terminator = 1;
while ($chars[$terminator] ne '00') {
if ($terminator == $#chars) {
print STDERR "Warning: missing null terminator in " .
".gnu_debuglink section of $file.\n";
return '';
}
++$terminator;
}
if ($old_num == $#chars || $old_num - 4 > $#chars) {
print STDERR "Warning: malformed .gnu_debuglink section in $file.\n";
if ($#chars - $terminator > 3) {
print STDERR "Warning: Excess padding in .gnu_debuglink section " .
"of $file.\n";
return '';
}
$#chars = $terminator - 1;
my $basename = join('', map { chr(hex($_)) } @chars);