@@ -29,6 +29,9 @@ my $V = '0.01';
# Directories to scan.
my @DIRS = ('/proc', '/sys');
+# Timer for parsing each file, in seconds.
+my $TIMEOUT = 10;
+
# Script can only grep for kernel addresses on the following architectures. If
# your architecture is not listed here and has a grep'able kernel address please
# consider submitting a patch.
@@ -284,6 +287,23 @@ sub skip_parse
return skip($path, \@skip_parse_files_abs, \@skip_parse_files_any);
}
+sub timed_parse_file
+{
+ my ($file) = @_;
+
+ eval {
+ local $SIG{ALRM} = sub { die "alarm\n" }; # NB: \n required.
+ alarm $TIMEOUT;
+ parse_file($file);
+ alarm 0;
+ };
+
+ if ($@) {
+ die unless $@ eq "alarm\n"; # Propagate unexpected errors.
+ printf STDERR "timed out parsing: %s\n", $file;
+ }
+}
+
sub parse_file
{
my ($file) = @_;
@@ -335,7 +355,7 @@ sub walk
if (-d $path) {
push @dirs, $path;
} else {
- parse_file($path);
+ timed_parse_file($path);
}
}
}
Currently script can stall if we read certain files (like /proc/kmsg). While we have a mechanism to skip these files once they are discovered it would be nice to not stall on as yet undiscovered files of this kind. Set a timer before each file is parsed, warn user if timer expires. Suggested-by: Kees Cook <keescook@chromium.org> Signed-off-by: Tobin C. Harding <me@tobin.cc> --- scripts/leaking_addresses.pl | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-)