forked from Minki/linux
Leaking-addresses patches for 4.17-rc1
Here is the patch set for the 4.17-rc1 merge window. This set represents improvements to the scripts/leaking_addresses.pl script. The major improvement is that with this set applied the script actually runs in a reasonable amount of time (less than a minute on a standard stock Ubuntu user desktop). Also, we have a second maintainer now and a tree hosted on kernel.org We do a few code clean ups. We fix the command help output. Handling of the vsyscall address range is fixed to check the whole range instead of just the start/end addresses. We add support for 5 page table levels (suggested on LKML). We use a system command to get the machine architecture instead of using Perl. Calling this command for every regex comparison is what previously choked the script, caching the result of this call gave the major speed improvement. We add support for scanning 32-bit kernels using the user/kernel memory split. Path skipping code refactored and simplified (meaning easier script configuration). We remove version numbering. We add a variable name to improve readability of a regex and finally we check filenames for leaking addresses. Currently script scans /proc/PID for all PID. With this set applied we only scan for PID==1. It was observed that on an idle system files under /proc/PID are predominantly the same for all processes. Also it was noted that the script does not scan _all_ the kernel since it only scans active processes. Scanning only for PID==1 makes explicit the inherent flaw in the script that the scan is only partial and also speeds things up. Signed-off-by: Tobin C. Harding <me@tobin.cc> -----BEGIN PGP SIGNATURE----- iQIcBAABCgAGBQJayARVAAoJEEC/nkwmnWYHSAAQALETjSg2h16dfAm2OxTvUemm re1zbyzhwxCeVJuBXusMcA0BTwRonmnh6FJhdcOBs0mb1F6bUaKIJpNwU17XKbOj 1ni0SiFBjDQA46E2ek7d1FC4E+1P72GSykDq6N+GmOAattIVn+SxAHv8MokyIyTT 7F1Qd0HOQZEF3UU6YUl3M4JfCdp7jaKxbjjXzJ5vnTvVBkgesx6Ccf5+D04xHXFD Eps7DZbUz646jI84eq+VgM77Uk9YzMCkoh2fEwoqe6o6HwNj5i96ifnCw5uIuopk lq40J7Wc59hK/Cz4rU52G9Ml5P2KY9Uv4CRL9JB/ZYEx+c246NF43ewrX5uzfrsd wXAO8FqcZA99YW8XGWKHC/bToSjbiMPtwx1IRn6sOuOS3l7NN8afpWsLpqPk8ECA ImzugUf82vrhCWGOBzNFFMAIHTN+BM54v+foJOdxAqQVveW+Ze7uBRY2ZIEq7ViT XXgOqDQz7Ub6N0C3cRAqmRc1Yv2n8QGg56uqam5MrMGtz6NrBMROTgafQMRFrf90 q+KfBvr6ofzuTWyfnUL0UXiHKvRmVro8hk/mdeJqqdS6dxng5bMT1ODK7SXlzyZQ Uf6ePo1pN3TpZRUKdwcyDA0+sHNHbXoE/NsC5UuwAnbE5u6m1FuqeqoysVJTKq5d /1IejdG15RYMh8YSYu5L =9BLH -----END PGP SIGNATURE----- Merge tag 'leaks-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tobin/leaks Pull leaking-addresses updates from Tobin Harding: "This set represents improvements to the scripts/leaking_addresses.pl script. The major improvement is that with this set applied the script actually runs in a reasonable amount of time (less than a minute on a standard stock Ubuntu user desktop). Also, we have a second maintainer now and a tree hosted on kernel.org We do a few code clean ups. We fix the command help output. Handling of the vsyscall address range is fixed to check the whole range instead of just the start/end addresses. We add support for 5 page table levels (suggested on LKML). We use a system command to get the machine architecture instead of using Perl. Calling this command for every regex comparison is what previously choked the script, caching the result of this call gave the major speed improvement. We add support for scanning 32-bit kernels using the user/kernel memory split. Path skipping code refactored and simplified (meaning easier script configuration). We remove version numbering. We add a variable name to improve readability of a regex and finally we check filenames for leaking addresses. Currently script scans /proc/PID for all PID. With this set applied we only scan for PID==1. It was observed that on an idle system files under /proc/PID are predominantly the same for all processes. Also it was noted that the script does not scan _all_ the kernel since it only scans active processes. Scanning only for PID==1 makes explicit the inherent flaw in the script that the scan is only partial and also speeds things up" * tag 'leaks-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tobin/leaks: MAINTAINERS: Update LEAKING_ADDRESSES leaking_addresses: check if file name contains address leaking_addresses: explicitly name variable used in regex leaking_addresses: remove version number leaking_addresses: skip '/proc/1/syscall' leaking_addresses: skip all /proc/PID except /proc/1 leaking_addresses: cache architecture name leaking_addresses: simplify path skipping leaking_addresses: do not parse binary files leaking_addresses: add 32-bit support leaking_addresses: add is_arch() wrapper subroutine leaking_addresses: use system command to get arch leaking_addresses: add support for 5 page table levels leaking_addresses: add support for kernel config file leaking_addresses: add range check for vsyscall memory leaking_addresses: indent dependant options leaking_addresses: remove command examples leaking_addresses: remove mention of kptr_restrict leaking_addresses: fix typo function not called
This commit is contained in:
Linus Torvalds
commit
299f89d53e
@ -7919,7 +7919,10 @@ F: drivers/scsi/53c700*
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LEAKING_ADDRESSES
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M: Tobin C. Harding <me@tobin.cc>
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M: Tycho Andersen <tycho@tycho.ws>
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L: kernel-hardening@lists.openwall.com
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S: Maintained
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/tobin/leaks.git
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F: scripts/leaking_addresses.pl
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LED SUBSYSTEM
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@ -3,15 +3,20 @@
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# (c) 2017 Tobin C. Harding <me@tobin.cc>
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# Licensed under the terms of the GNU GPL License version 2
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#
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# leaking_addresses.pl: Scan 64 bit kernel for potential leaking addresses.
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# leaking_addresses.pl: Scan the kernel for potential leaking addresses.
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# - Scans dmesg output.
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# - Walks directory tree and parses each file (for each directory in @DIRS).
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#
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# Use --debug to output path before parsing, this is useful to find files that
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# cause the script to choke.
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#
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# You may like to set kptr_restrict=2 before running script
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# (see Documentation/sysctl/kernel.txt).
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# When the system is idle it is likely that most files under /proc/PID will be
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# identical for various processes. Scanning _all_ the PIDs under /proc is
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# unnecessary and implies that we are thoroughly scanning /proc. This is _not_
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# the case because there may be ways userspace can trigger creation of /proc
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# files that leak addresses but were not present during a scan. For these two
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# reasons we exclude all PID directories under /proc except '1/'
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use warnings;
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use strict;
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@ -22,9 +27,10 @@ use Cwd 'abs_path';
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use Term::ANSIColor qw(:constants);
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use Getopt::Long qw(:config no_auto_abbrev);
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use Config;
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use bigint qw/hex/;
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use feature 'state';
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my $P = $0;
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my $V = '0.01';
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# Directories to scan.
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my @DIRS = ('/proc', '/sys');
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@ -32,10 +38,9 @@ my @DIRS = ('/proc', '/sys');
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# Timer for parsing each file, in seconds.
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my $TIMEOUT = 10;
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# Script can only grep for kernel addresses on the following architectures. If
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# your architecture is not listed here and has a grep'able kernel address please
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# consider submitting a patch.
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my @SUPPORTED_ARCHITECTURES = ('x86_64', 'ppc64');
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# Kernel addresses vary by architecture. We can only auto-detect the following
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# architectures (using `uname -m`). (flag --32-bit overrides auto-detection.)
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my @SUPPORTED_ARCHITECTURES = ('x86_64', 'ppc64', 'x86');
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# Command line options.
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my $help = 0;
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@ -43,25 +48,24 @@ my $debug = 0;
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my $raw = 0;
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my $output_raw = ""; # Write raw results to file.
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my $input_raw = ""; # Read raw results from file instead of scanning.
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my $suppress_dmesg = 0; # Don't show dmesg in output.
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my $squash_by_path = 0; # Summary report grouped by absolute path.
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my $squash_by_filename = 0; # Summary report grouped by filename.
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my $kernel_config_file = ""; # Kernel configuration file.
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my $opt_32bit = 0; # Scan 32-bit kernel.
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my $page_offset_32bit = 0; # Page offset for 32-bit kernel.
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# Do not parse these files (absolute path).
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my @skip_parse_files_abs = ('/proc/kmsg',
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'/proc/kcore',
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'/proc/fs/ext4/sdb1/mb_groups',
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'/proc/1/fd/3',
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'/sys/firmware/devicetree',
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# Skip these absolute paths.
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my @skip_abs = (
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'/proc/kmsg',
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'/proc/device-tree',
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'/proc/1/syscall',
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'/sys/firmware/devicetree',
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'/sys/kernel/debug/tracing/trace_pipe',
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'/sys/kernel/security/apparmor/revision');
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# Do not parse these files under any subdirectory.
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my @skip_parse_files_any = ('0',
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'1',
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'2',
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# Skip these under any subdirectory.
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my @skip_any = (
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'pagemap',
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'events',
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'access',
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@ -69,20 +73,9 @@ my @skip_parse_files_any = ('0',
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'snapshot_raw',
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'trace_pipe_raw',
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'ptmx',
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'trace_pipe');
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# Do not walk these directories (absolute path).
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my @skip_walk_dirs_abs = ();
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# Do not walk these directories under any subdirectory.
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my @skip_walk_dirs_any = ('self',
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'thread-self',
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'cwd',
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'trace_pipe',
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'fd',
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'usbmon',
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'stderr',
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'stdin',
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'stdout');
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'usbmon');
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sub help
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{
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@ -91,7 +84,6 @@ sub help
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print << "EOM";
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Usage: $P [OPTIONS]
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Version: $V
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Options:
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@ -101,21 +93,13 @@ Options:
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--suppress-dmesg Do not show dmesg results.
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--squash-by-path Show one result per unique path.
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--squash-by-filename Show one result per unique filename.
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--kernel-config-file=<file> Kernel configuration file (e.g /boot/config)
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--32-bit Scan 32-bit kernel.
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--page-offset-32-bit=o Page offset (for 32-bit kernel 0xABCD1234).
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-d, --debug Display debugging output.
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-h, --help, --version Display this help and exit.
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Examples:
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# Scan kernel and dump raw results.
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$0
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# Scan kernel and save results to file.
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$0 --output-raw scan.out
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# View summary report.
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$0 --input-raw scan.out --squash-by-filename
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Scans the running (64 bit) kernel for potential leaking addresses.
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Scans the running kernel for potential leaking addresses.
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EOM
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exit($exitcode);
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@ -131,6 +115,9 @@ GetOptions(
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'squash-by-path' => \$squash_by_path,
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'squash-by-filename' => \$squash_by_filename,
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'raw' => \$raw,
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'kernel-config-file=s' => \$kernel_config_file,
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'32-bit' => \$opt_32bit,
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'page-offset-32-bit=o' => \$page_offset_32bit,
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) or help(1);
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help(0) if ($help);
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@ -146,16 +133,19 @@ if (!$input_raw and ($squash_by_path or $squash_by_filename)) {
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exit(128);
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}
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if (!is_supported_architecture()) {
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if (!(is_supported_architecture() or $opt_32bit or $page_offset_32bit)) {
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printf "\nScript does not support your architecture, sorry.\n";
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printf "\nCurrently we support: \n\n";
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foreach(@SUPPORTED_ARCHITECTURES) {
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printf "\t%s\n", $_;
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}
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printf("\n");
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my $archname = $Config{archname};
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printf "\n\$ perl -MConfig -e \'print \"\$Config{archname}\\n\"\'\n";
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printf "%s\n", $archname;
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printf("If you are running a 32-bit architecture you may use:\n");
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printf("\n\t--32-bit or --page-offset-32-bit=<page offset>\n\n");
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my $archname = `uname -m`;
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printf("Machine hardware name (`uname -m`): %s\n", $archname);
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exit(129);
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}
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@ -177,49 +167,183 @@ sub dprint
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sub is_supported_architecture
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{
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return (is_x86_64() or is_ppc64());
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return (is_x86_64() or is_ppc64() or is_ix86_32());
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}
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sub is_32bit
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{
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# Allow --32-bit or --page-offset-32-bit to override
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if ($opt_32bit or $page_offset_32bit) {
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return 1;
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}
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return is_ix86_32();
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}
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sub is_ix86_32
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{
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state $arch = `uname -m`;
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chomp $arch;
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if ($arch =~ m/i[3456]86/) {
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return 1;
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}
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return 0;
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}
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sub is_arch
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{
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my ($desc) = @_;
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my $arch = `uname -m`;
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chomp $arch;
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if ($arch eq $desc) {
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return 1;
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}
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return 0;
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}
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sub is_x86_64
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{
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my $archname = $Config{archname};
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if ($archname =~ m/x86_64/) {
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return 1;
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}
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return 0;
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state $is = is_arch('x86_64');
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return $is;
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}
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sub is_ppc64
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{
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my $archname = $Config{archname};
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if ($archname =~ m/powerpc/ and $archname =~ m/64/) {
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return 1;
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state $is = is_arch('ppc64');
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return $is;
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}
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return 0;
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# Gets config option value from kernel config file.
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# Returns "" on error or if config option not found.
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sub get_kernel_config_option
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{
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my ($option) = @_;
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my $value = "";
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my $tmp_file = "";
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my @config_files;
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# Allow --kernel-config-file to override.
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if ($kernel_config_file ne "") {
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@config_files = ($kernel_config_file);
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} elsif (-R "/proc/config.gz") {
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my $tmp_file = "/tmp/tmpkconf";
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if (system("gunzip < /proc/config.gz > $tmp_file")) {
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dprint "$0: system(gunzip < /proc/config.gz) failed\n";
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return "";
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} else {
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@config_files = ($tmp_file);
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}
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} else {
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my $file = '/boot/config-' . `uname -r`;
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chomp $file;
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@config_files = ($file, '/boot/config');
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}
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foreach my $file (@config_files) {
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dprint("parsing config file: %s\n", $file);
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$value = option_from_file($option, $file);
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if ($value ne "") {
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last;
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}
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}
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if ($tmp_file ne "") {
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system("rm -f $tmp_file");
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}
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return $value;
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}
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# Parses $file and returns kernel configuration option value.
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sub option_from_file
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{
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my ($option, $file) = @_;
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my $str = "";
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my $val = "";
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open(my $fh, "<", $file) or return "";
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while (my $line = <$fh> ) {
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if ($line =~ /^$option/) {
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($str, $val) = split /=/, $line;
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chomp $val;
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last;
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}
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}
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close $fh;
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return $val;
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}
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sub is_false_positive
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{
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my ($match) = @_;
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if (is_32bit()) {
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return is_false_positive_32bit($match);
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}
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# 64 bit false positives.
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if ($match =~ '\b(0x)?(f|F){16}\b' or
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$match =~ '\b(0x)?0{16}\b') {
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return 1;
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}
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if (is_x86_64) {
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# vsyscall memory region, we should probably check against a range here.
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if ($match =~ '\bf{10}600000\b' or
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$match =~ '\bf{10}601000\b') {
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if (is_x86_64() and is_in_vsyscall_memory_region($match)) {
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return 1;
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}
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}
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return 0;
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}
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sub is_false_positive_32bit
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{
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my ($match) = @_;
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state $page_offset = get_page_offset();
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if ($match =~ '\b(0x)?(f|F){8}\b') {
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return 1;
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}
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if (hex($match) < $page_offset) {
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return 1;
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}
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return 0;
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}
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# returns integer value
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sub get_page_offset
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{
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my $page_offset;
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my $default_offset = 0xc0000000;
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# Allow --page-offset-32bit to override.
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if ($page_offset_32bit != 0) {
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return $page_offset_32bit;
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}
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$page_offset = get_kernel_config_option('CONFIG_PAGE_OFFSET');
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if (!$page_offset) {
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return $default_offset;
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}
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return $page_offset;
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}
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sub is_in_vsyscall_memory_region
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{
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my ($match) = @_;
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my $hex = hex($match);
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my $region_min = hex("0xffffffffff600000");
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my $region_max = hex("0xffffffffff601000");
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return ($hex >= $region_min and $hex <= $region_max);
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}
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# True if argument potentially contains a kernel address.
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sub may_leak_address
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{
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@ -238,14 +362,8 @@ sub may_leak_address
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return 0;
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||||
}
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||||
|
||||
# One of these is guaranteed to be true.
|
||||
if (is_x86_64()) {
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$address_re = '\b(0x)?ffff[[:xdigit:]]{12}\b';
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} elsif (is_ppc64()) {
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||||
$address_re = '\b(0x)?[89abcdef]00[[:xdigit:]]{13}\b';
|
||||
}
|
||||
|
||||
while (/($address_re)/g) {
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$address_re = get_address_re();
|
||||
while ($line =~ /($address_re)/g) {
|
||||
if (!is_false_positive($1)) {
|
||||
return 1;
|
||||
}
|
||||
@ -254,6 +372,31 @@ sub may_leak_address
|
||||
return 0;
|
||||
}
|
||||
|
||||
sub get_address_re
|
||||
{
|
||||
if (is_ppc64()) {
|
||||
return '\b(0x)?[89abcdef]00[[:xdigit:]]{13}\b';
|
||||
} elsif (is_32bit()) {
|
||||
return '\b(0x)?[[:xdigit:]]{8}\b';
|
||||
}
|
||||
|
||||
return get_x86_64_re();
|
||||
}
|
||||
|
||||
sub get_x86_64_re
|
||||
{
|
||||
# We handle page table levels but only if explicitly configured using
|
||||
# CONFIG_PGTABLE_LEVELS. If config file parsing fails or config option
|
||||
# is not found we default to using address regular expression suitable
|
||||
# for 4 page table levels.
|
||||
state $ptl = get_kernel_config_option('CONFIG_PGTABLE_LEVELS');
|
||||
|
||||
if ($ptl == 5) {
|
||||
return '\b(0x)?ff[[:xdigit:]]{14}\b';
|
||||
}
|
||||
return '\b(0x)?ffff[[:xdigit:]]{12}\b';
|
||||
}
|
||||
|
||||
sub parse_dmesg
|
||||
{
|
||||
open my $cmd, '-|', 'dmesg';
|
||||
@ -268,26 +411,20 @@ sub parse_dmesg
|
||||
# True if we should skip this path.
|
||||
sub skip
|
||||
{
|
||||
my ($path, $paths_abs, $paths_any) = @_;
|
||||
my ($path) = @_;
|
||||
|
||||
foreach (@$paths_abs) {
|
||||
foreach (@skip_abs) {
|
||||
return 1 if (/^$path$/);
|
||||
}
|
||||
|
||||
my($filename, $dirs, $suffix) = fileparse($path);
|
||||
foreach (@$paths_any) {
|
||||
foreach (@skip_any) {
|
||||
return 1 if (/^$filename$/);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
sub skip_parse
|
||||
{
|
||||
my ($path) = @_;
|
||||
return skip($path, \@skip_parse_files_abs, \@skip_parse_files_any);
|
||||
}
|
||||
|
||||
sub timed_parse_file
|
||||
{
|
||||
my ($file) = @_;
|
||||
@ -313,11 +450,9 @@ sub parse_file
|
||||
return;
|
||||
}
|
||||
|
||||
if (skip_parse($file)) {
|
||||
dprint "skipping file: $file\n";
|
||||
if (! -T $file) {
|
||||
return;
|
||||
}
|
||||
dprint "parsing: $file\n";
|
||||
|
||||
open my $fh, "<", $file or return;
|
||||
while ( <$fh> ) {
|
||||
@ -328,12 +463,14 @@ sub parse_file
|
||||
close $fh;
|
||||
}
|
||||
|
||||
|
||||
# True if we should skip walking this directory.
|
||||
sub skip_walk
|
||||
# Checks if the actual path name is leaking a kernel address.
|
||||
sub check_path_for_leaks
|
||||
{
|
||||
my ($path) = @_;
|
||||
return skip($path, \@skip_walk_dirs_abs, \@skip_walk_dirs_any)
|
||||
|
||||
if (may_leak_address($path)) {
|
||||
printf("Path name may contain address: $path\n");
|
||||
}
|
||||
}
|
||||
|
||||
# Recursively walk directory tree.
|
||||
@ -342,7 +479,6 @@ sub walk
|
||||
my @dirs = @_;
|
||||
|
||||
while (my $pwd = shift @dirs) {
|
||||
next if (skip_walk($pwd));
|
||||
next if (!opendir(DIR, $pwd));
|
||||
my @files = readdir(DIR);
|
||||
closedir(DIR);
|
||||
@ -353,11 +489,21 @@ sub walk
|
||||
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));
|
||||
|
||||
check_path_for_leaks($path);
|
||||
|
||||
if (-d $path) {
|
||||
push @dirs, $path;
|
||||
} else {
|
||||
timed_parse_file($path);
|
||||
next;
|
||||
}
|
||||
|
||||
dprint "parsing: $path\n";
|
||||
timed_parse_file($path);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user