leaking_addresses: skip all /proc/PID except /proc/1
When the system is idle it is likely that most files under /proc/PID
will be identical for various processes. Scanning _all_ the PIDs under
/proc is unnecessary and implies that we are thoroughly scanning /proc.
This is _not_ the case because there may be ways userspace can trigger
creation of /proc files that leak addresses but were not present during
a scan. For these two reasons we should exclude all PID directories
under /proc except '1/'
Exclude all /proc/PID except /proc/1.
Signed-off-by: Tobin C. Harding <[email protected]>
diff --git a/scripts/leaking_addresses.pl b/scripts/leaking_addresses.pl
index 6e5bc57..2075d98 100755
--- a/scripts/leaking_addresses.pl
+++ b/scripts/leaking_addresses.pl
@@ -10,6 +10,14 @@
# Use --debug to output path before parsing, this is useful to find files that
# cause the script to choke.
+#
+# When the system is idle it is likely that most files under /proc/PID will be
+# identical for various processes. Scanning _all_ the PIDs under /proc is
+# unnecessary and implies that we are thoroughly scanning /proc. This is _not_
+# the case because there may be ways userspace can trigger creation of /proc
+# files that leak addresses but were not present during a scan. For these two
+# reasons we exclude all PID directories under /proc except '1/'
+
use warnings;
use strict;
use POSIX;
@@ -472,6 +480,10 @@
my $path = "$pwd/$file";
next if (-l $path);
+ # skip /proc/PID except /proc/1
+ next if (($path =~ /^\/proc\/[0-9]+$/) &&
+ ($path !~ /^\/proc\/1$/));
+
next if (skip($path));
if (-d $path) {
