linux-hardening - [PATCH v2 2/4] leaking_addresses: Use File::Temp for /tmp files

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Date: Thu, 22 Feb 2024 14:00:49 -0800
From: Kees Cook <keescook@...omium.org>
To: Tycho Andersen <tycho@...ho.pizza>
Cc: Kees Cook <keescook@...omium.org>,
	"Tobin C. Harding" <me@...in.cc>,
	linux-hardening@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Guixiong Wei <guixiongwei@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/4] leaking_addresses: Use File::Temp for /tmp files

Instead of using a statically named path in /tmp, use File::Temp to create
(and remove) the temporary file used for parsing /proc/config.gz.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
Cc: Tycho Andersen <tycho@...ho.pizza>
Cc: "Tobin C. Harding" <me@...in.cc>
Cc: linux-hardening@...r.kernel.org
---
 scripts/leaking_addresses.pl | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/scripts/leaking_addresses.pl b/scripts/leaking_addresses.pl
index e695634d153d..dd05fbcf15c5 100755
--- a/scripts/leaking_addresses.pl
+++ b/scripts/leaking_addresses.pl
@@ -23,6 +23,7 @@ use strict;
 use POSIX;
 use File::Basename;
 use File::Spec;
+use File::Temp qw/tempfile/;
 use Cwd 'abs_path';
 use Term::ANSIColor qw(:constants);
 use Getopt::Long qw(:config no_auto_abbrev);
@@ -221,6 +222,7 @@ sub get_kernel_config_option
 {
 	my ($option) = @_;
 	my $value = "";
+	my $tmp_fh;
 	my $tmp_file = "";
 	my @config_files;
 
@@ -228,7 +230,8 @@ sub get_kernel_config_option
 	if ($kernel_config_file ne "") {
 		@config_files = ($kernel_config_file);
 	} elsif (-R "/proc/config.gz") {
-		my $tmp_file = "/tmp/tmpkconf";
+		($tmp_fh, $tmp_file) = tempfile("config.gz-XXXXXX",
+						UNLINK => 1);
 
 		if (system("gunzip < /proc/config.gz > $tmp_file")) {
 			dprint("system(gunzip < /proc/config.gz) failed\n");
@@ -250,10 +253,6 @@ sub get_kernel_config_option
 		}
 	}
 
-	if ($tmp_file ne "") {
-		system("rm -f $tmp_file");
-	}
-
 	return $value;
 }
 
-- 
2.34.1