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hardening-check: obey READELF, LDD & OBJDUMP env vars for tool names #2

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hardening-check: obey READELF, LDD & OBJDUMP env vars for tool names #2

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17 changes: 10 additions & 7 deletions scripts/hardening-check.pl
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,9 @@
pod2usage(1) if $help;
pod2usage(-exitstatus => 0, -verbose => 2, -noperldoc => 1) if $man;

my $ldd = $ENV{'LDD'} || "ldd";
my $objdump = $ENV{'OBJDUMP'} || "objdump";
my $readelf = $ENV{'READELF'} || "readelf";
my $overall = 0;
my $rc = 0;
my $report = "";
Expand Down Expand Up @@ -220,8 +223,8 @@ (@)
# Find the libc used in this executable, if any.
sub find_libc($) {
my ($file) = @_;
my $ldd = output("ldd", $file);
$ldd =~ /^\s*libc\.so\.\S+\s+\S+\s+(\S+)/m;
my $ldd_out = output($ldd, $file);
$ldd_out =~ /^\s*libc\.so\.\S+\s+\S+\s+(\S+)/m;
return $1 || "";
}

Expand All @@ -232,7 +235,7 @@ ($$)
# Catch "NOTYPE" for object archives.
my $func_regex = " (I?FUNC|NOTYPE) ";

my $relocs = output("readelf", "-sW", $file);
my $relocs = output($readelf, "-sW", $file);
for my $line (split("\n", $relocs)) {
next if ($line !~ /$func_regex/);
next if ($undefined && $line !~ /$func_regex.* UND /);
Expand Down Expand Up @@ -271,21 +274,21 @@ ($$)
@tags = ();

# Get program headers.
my $PROG_REPORT = output("readelf", "-lW", $file);
my $PROG_REPORT = output($readelf, "-lW", $file);
if (length($PROG_REPORT) == 0) {
$overall = 1;
next;
}

# Get ELF headers.
my $DYN_REPORT = output("readelf", "-dW", $file);
my $DYN_REPORT = output($readelf, "-dW", $file);

# Get disassembly
my $DISASM
= output("objdump", "-d", "--no-show-raw-insn", "-M", "intel", $file);
= output($objdump, "-d", "--no-show-raw-insn", "-M", "intel", $file);

# Get notes
my $NOTES = output("readelf", "-n", $file);
my $NOTES = output($readelf, "-n", $file);

# Get list of all symbols needing external resolution.
my $functions = find_functions($file, 1);
Expand Down