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authorTobin C. Harding <me@tobin.cc>2017-12-07 12:33:21 +1100
committerTobin C. Harding <me@tobin.cc>2018-04-07 08:50:34 +1000
commit87e37588563da905a8506b8922cfba1d71382a64 (patch)
treeedbbc7102182bdfb4d0494b0d9dea81d54a5f106 /scripts
parent15d60a35b8fe82363325494a2a7c49f26f9f5594 (diff)
downloadlinux-stericsson-87e37588563da905a8506b8922cfba1d71382a64.tar.gz
leaking_addresses: add range check for vsyscall memory
Currently script checks only first and last address in the vsyscall memory range. We can do better than this. When checking for false positives against $match, we can convert $match to a hexadecimal value then check if it lies within the range of vsyscall addresses. Check whole range of vsyscall addresses when checking for false positive. Signed-off-by: Tobin C. Harding <me@tobin.cc>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/leaking_addresses.pl20
1 files changed, 14 insertions, 6 deletions
diff --git a/scripts/leaking_addresses.pl b/scripts/leaking_addresses.pl
index 31cf54ad379f..398e534f0e16 100755
--- a/scripts/leaking_addresses.pl
+++ b/scripts/leaking_addresses.pl
@@ -19,6 +19,7 @@ use Cwd 'abs_path';
use Term::ANSIColor qw(:constants);
use Getopt::Long qw(:config no_auto_abbrev);
use Config;
+use bigint qw/hex/;
my $P = $0;
my $V = '0.01';
@@ -195,17 +196,24 @@ sub is_false_positive
return 1;
}
- if (is_x86_64()) {
- # vsyscall memory region, we should probably check against a range here.
- if ($match =~ '\bf{10}600000\b' or
- $match =~ '\bf{10}601000\b') {
- return 1;
- }
+ if (is_x86_64() and is_in_vsyscall_memory_region($match)) {
+ return 1;
}
return 0;
}
+sub is_in_vsyscall_memory_region
+{
+ my ($match) = @_;
+
+ my $hex = hex($match);
+ my $region_min = hex("0xffffffffff600000");
+ my $region_max = hex("0xffffffffff601000");
+
+ return ($hex >= $region_min and $hex <= $region_max);
+}
+
# True if argument potentially contains a kernel address.
sub may_leak_address
{