Alexander Popov [Sat, 28 May 2022 17:58:57 +0000 (20:58 +0300)]
Describe the cmdline checking support in README
Alexander Popov [Sat, 28 May 2022 17:48:28 +0000 (20:48 +0300)]
Add the example config of Fedora 34
Alexander Popov [Sat, 28 May 2022 17:42:35 +0000 (20:42 +0300)]
Check the pti cmdline parameter
Alexander Popov [Sat, 28 May 2022 17:35:12 +0000 (20:35 +0300)]
Check the slab_nomerge cmdline parameter
Alexander Popov [Thu, 31 Mar 2022 17:26:45 +0000 (20:26 +0300)]
Check the randomize_kstack_offset cmdline parameter
Alexander Popov [Mon, 28 Mar 2022 09:17:31 +0000 (12:17 +0300)]
Add cmdline file parsing
Alexander Popov [Sun, 27 Mar 2022 20:46:11 +0000 (23:46 +0300)]
Add the infrastructure for cmdline checks
Alexander Popov [Sun, 27 Mar 2022 20:30:33 +0000 (23:30 +0300)]
Add '--cmdline' argument for the tool
Alexander Popov [Sun, 27 Mar 2022 20:03:02 +0000 (23:03 +0300)]
Add cmdline checks to '--print'
Alexander Popov [Sun, 27 Mar 2022 18:25:04 +0000 (21:25 +0300)]
Add the CmdlineCheck class
Alexander Popov [Sun, 15 May 2022 20:21:25 +0000 (23:21 +0300)]
Add the comment about sysrq_always_enabled
Thanks to @izh1979 for the idea (and for the rodata idea too).
Alexander Popov [Sun, 15 May 2022 18:45:09 +0000 (21:45 +0300)]
Add the comment about rodata
Alexander Popov [Sun, 8 May 2022 13:21:31 +0000 (16:21 +0300)]
Update direct feedback from Linux kernel maintainers (#62)
Alexander Popov [Fri, 6 May 2022 22:21:21 +0000 (01:21 +0300)]
Add the comment about arm64.nomte
Thanks to @izh1979 for the idea.
Alexander Popov [Fri, 6 May 2022 22:21:00 +0000 (01:21 +0300)]
Add the comment about kernel.randomize_va_space
Thanks to @izh1979 for the idea.
Alexander Popov [Fri, 6 May 2022 15:28:44 +0000 (18:28 +0300)]
Add the KGDB check
Thanks to @izh1979 for the idea.
Alexander Popov [Fri, 6 May 2022 15:20:56 +0000 (18:20 +0300)]
Add RANDOMIZE_MODULE_REGION_FULL for arm64
Thanks to @izh1979 for the idea.
Alexander Popov [Thu, 28 Apr 2022 11:49:52 +0000 (14:49 +0300)]
Update the README
Ready for the release 0.5.17.
Alexander Popov [Thu, 28 Apr 2022 11:38:31 +0000 (14:38 +0300)]
Merge pull request #62 from evdenis/master
Add BLK_DEV_FD_RAWCMD
Thanks @evdenis!
Alexander Popov [Thu, 28 Apr 2022 11:31:00 +0000 (14:31 +0300)]
Add the type property for OptCheck to fix a pylint error
Fix for kconfig_hardened_check/__init__.py:125:68: E1101:
Instance of 'OptCheck' has no 'type' member (no-member)
Denis Efremov [Wed, 27 Apr 2022 18:09:41 +0000 (21:09 +0300)]
Add BLK_DEV_FD_RAWCMD
See commit torvalds/linux@
233087ca0636 ("floppy: disable FDRAWCMD by default")
Signed-off-by: Denis Efremov <efremov@linux.com>
Alexander Popov [Fri, 22 Apr 2022 10:13:05 +0000 (13:13 +0300)]
Add the STACKPROTECTOR check from KSPP
Thanks to @izh1979 for the idea.
Alexander Popov [Fri, 22 Apr 2022 09:50:34 +0000 (12:50 +0300)]
Drop the ARM64_MTE check for userspace hardening
It is moved to kernel self protection.
Thanks to @izh1979 for the idea.
Alexander Popov [Fri, 22 Apr 2022 09:34:49 +0000 (12:34 +0300)]
Separate out checking SECURITY_WRITABLE_HOOKS and SECURITY_SELINUX_DISABLE
Thanks to @izh1979 for the idea.
Combining these checks with OR is not correct.
Alexander Popov [Fri, 22 Apr 2022 07:35:10 +0000 (10:35 +0300)]
Fix the arch condition for the SCHED_CORE check
Alexander Popov [Fri, 22 Apr 2022 07:23:23 +0000 (10:23 +0300)]
Add the KSPP recommendation of ZERO_CALL_USED_REGS
Alexander Popov [Fri, 22 Apr 2022 07:23:04 +0000 (10:23 +0300)]
Disabling X86_MSR is recommended by KSPP
Alexander Popov [Wed, 20 Apr 2022 16:25:16 +0000 (19:25 +0300)]
Fix the bug in the verdict description for ComplexOptCheck
Before the fix:
CONFIG_EFI_DISABLE_PCI_DMA | kconfig | y | clipos | self_protection | OK: not found
After the fix:
CONFIG_EFI_DISABLE_PCI_DMA | kconfig | y | clipos | self_protection | OK: CONFIG_EFI not found
Also added the assertions preventing similar bugs in future.
Alexander Popov [Thu, 31 Mar 2022 16:38:25 +0000 (19:38 +0300)]
Additional check for TYPES_OF_CHECKS
Alexander Popov [Mon, 28 Mar 2022 12:12:36 +0000 (15:12 +0300)]
Drop PresenceCheck; OptCheck without 'expected' parameter can do the job
Alexander Popov [Wed, 20 Apr 2022 14:59:38 +0000 (17:59 +0300)]
Update the KSPP recommendations in the config_files
Alexander Popov [Wed, 20 Apr 2022 14:42:49 +0000 (17:42 +0300)]
Add the KSPP recommendation of SCHED_CORE
Alexander Popov [Wed, 20 Apr 2022 14:24:32 +0000 (17:24 +0300)]
Add the KSPP recommendation of IOMMU_DEFAULT_DMA_STRICT
Alexander Popov [Wed, 20 Apr 2022 14:16:58 +0000 (17:16 +0300)]
Add the KSPP recommendation of WERROR
Alexander Popov [Wed, 20 Apr 2022 14:13:50 +0000 (17:13 +0300)]
Add the KSPP recommendation of KFENCE
Alexander Popov [Fri, 8 Apr 2022 21:05:38 +0000 (00:05 +0300)]
No need in BPF_UNPRIV_DEFAULT_OFF if BPF_SYSCALL is disabled
Alexander Popov [Fri, 8 Apr 2022 16:45:37 +0000 (19:45 +0300)]
Merge branch 'from-martin-rowe'
Alexander Popov [Thu, 7 Apr 2022 17:20:16 +0000 (20:20 +0300)]
Add defconfigs for Linux v5.17
Alexander Popov [Mon, 28 Mar 2022 09:54:47 +0000 (12:54 +0300)]
Drop unneeded return values (refactoring)
Martin Rowe [Sat, 26 Mar 2022 14:20:16 +0000 (00:20 +1000)]
UBSAN_SANITIZE_ALL not available on ARM
ARCH_HAS_UBSAN_SANITIZE_ALL is not selected for arm arch, which
prevents selectiong of CONFIG_UBSAN_SANITIZE_ALL
https://github.com/torvalds/linux/blob/master/arch/arm/Kconfig
https://github.com/torvalds/linux/blob/master/lib/Kconfig.ubsan
Alexander Popov [Sun, 20 Mar 2022 21:53:37 +0000 (00:53 +0300)]
Add HARDEN_BRANCH_HISTORY for arm
Alexander Popov [Sun, 20 Mar 2022 21:51:30 +0000 (00:51 +0300)]
Add MITIGATE_SPECTRE_BRANCH_HISTORY for arm64
Alexander Popov [Fri, 18 Mar 2022 22:11:27 +0000 (01:11 +0300)]
THREAD_INFO_IN_TASK is available for ARM since v5.16
Alexander Popov [Fri, 18 Mar 2022 21:36:19 +0000 (00:36 +0300)]
Merge branch 'from-martin-rowe'
Refers to #59.
Thanks @cyanidium
Martin Rowe [Tue, 15 Mar 2022 12:38:05 +0000 (12:38 +0000)]
EFI mitigations can't be enabled if EFI is not set
Both EFI_DISABLE_PCI_DMA and RESET_ATTACK_MITIGATION depend on EFI, but if EFI is not set, neither config is required.
Useful on embedded devices that use u-boot or similar instead of EFI.
Alexander Popov [Sun, 13 Mar 2022 22:28:18 +0000 (01:28 +0300)]
Fix the BPF_UNPRIV_DEFAULT_OFF check (it is enabled by default)
Alexander Popov [Sun, 13 Mar 2022 18:12:23 +0000 (21:12 +0300)]
Add CONFIG_SLS vs CVE-2021-26341 in Straight-Line-Speculation
Alexander Popov [Sun, 13 Mar 2022 17:39:06 +0000 (20:39 +0300)]
Add the comment that l1d_flush is a part of the l1tf option
Alexander Popov [Sun, 13 Mar 2022 17:18:48 +0000 (20:18 +0300)]
Add BPF_UNPRIV_DEFAULT_OFF to cut_attack_surface
Alexander Popov [Sat, 5 Mar 2022 15:44:16 +0000 (18:44 +0300)]
Use the option type instead of calling hasattr()
Alexander Popov [Sat, 5 Mar 2022 14:42:24 +0000 (17:42 +0300)]
Merge branch 'refactoring'
It has more preparations for solving #46.
Alexander Popov [Mon, 14 Feb 2022 21:57:42 +0000 (00:57 +0300)]
Introduce the json_dump() class method
Alexander Popov [Mon, 14 Feb 2022 21:19:42 +0000 (00:19 +0300)]
Improve 'type' for ComplexOptCheck and PresenceCheck classes
Alexander Popov [Mon, 14 Feb 2022 21:18:50 +0000 (00:18 +0300)]
Make populate_with_data() aware of data type
Alexander Popov [Mon, 14 Feb 2022 18:23:58 +0000 (21:23 +0300)]
Add 'type' for PresenceCheck and VersionCheck
Alexander Popov [Mon, 14 Feb 2022 18:22:17 +0000 (21:22 +0300)]
Rename VerCheck to VersionCheck
Alexander Popov [Mon, 14 Feb 2022 16:50:21 +0000 (19:50 +0300)]
Add more ComplexOptCheck validation
Alexander Popov [Mon, 14 Feb 2022 14:47:21 +0000 (17:47 +0300)]
Improve print_unknown_options()
Don't miss options behind the second level of ComplexOptCheck
Alexander Popov [Mon, 14 Feb 2022 07:59:36 +0000 (10:59 +0300)]
Remove 'CONFIG_' hardcoding
Alexander Popov [Fri, 11 Feb 2022 22:16:44 +0000 (01:16 +0300)]
Merge branch 'refactoring'
It has preparations for solving #46.
Alexander Popov [Fri, 11 Feb 2022 22:03:06 +0000 (01:03 +0300)]
Refactor the OR logic code
Alexander Popov [Fri, 11 Feb 2022 17:08:41 +0000 (20:08 +0300)]
Rename config to kconfig where needed (part II)
Alexander Popov [Sat, 22 Jan 2022 23:15:13 +0000 (02:15 +0300)]
Extract populate_with_data() from perform_checks()
Alexander Popov [Sat, 22 Jan 2022 22:10:09 +0000 (01:10 +0300)]
Rename config to kconfig where needed
Alexander Popov [Sat, 22 Jan 2022 21:34:01 +0000 (00:34 +0300)]
Print the type of a check in the json mode
Alexander Popov [Sat, 22 Jan 2022 21:33:04 +0000 (00:33 +0300)]
ComplexOptCheck type has the type of the first opt in it
Alexander Popov [Fri, 21 Jan 2022 23:22:37 +0000 (02:22 +0300)]
Update the example output in the README (yes, now I like it!)
Alexander Popov [Fri, 21 Jan 2022 23:19:05 +0000 (02:19 +0300)]
Do more output tuning
Alexander Popov [Fri, 21 Jan 2022 22:35:42 +0000 (01:35 +0300)]
Update the example output in the README
Alexander Popov [Fri, 21 Jan 2022 22:33:43 +0000 (01:33 +0300)]
Add check type
Alexander Popov [Fri, 21 Jan 2022 22:16:31 +0000 (01:16 +0300)]
Update the example output in the README
Alexander Popov [Fri, 21 Jan 2022 22:06:56 +0000 (01:06 +0300)]
Print compactly
Alexander Popov [Fri, 21 Jan 2022 21:15:16 +0000 (00:15 +0300)]
Introduce KconfigCheck class
Alexander Popov [Fri, 21 Jan 2022 15:45:54 +0000 (18:45 +0300)]
Fix TRIM_UNUSED_KSYMS check
TRIM_UNUSED_KSYMS can't be enabled if MODULES are disabled.
Thanks to @Churam for reporting.
Refers to #58.
Alexander Popov [Fri, 24 Dec 2021 17:51:11 +0000 (20:51 +0300)]
Add l1d_flush (for future reference)
Alexander Popov [Sun, 5 Dec 2021 11:57:08 +0000 (14:57 +0300)]
Add ARM64_PTR_AUTH_KERNEL extracted from ARM64_PTR_AUTH
Alexander Popov [Sun, 21 Nov 2021 13:09:53 +0000 (16:09 +0300)]
Document the output modes specified by the `-m` parameter
Alexander Popov [Sun, 21 Nov 2021 12:08:39 +0000 (15:08 +0300)]
TODO: RISC-V
See #56
Alexander Popov [Tue, 9 Nov 2021 18:59:43 +0000 (21:59 +0300)]
Update the README (a lot of new checks appeared)
Alexander Popov [Tue, 9 Nov 2021 18:29:10 +0000 (21:29 +0300)]
Keep the old X86_PTDUMP check as a backup
Alexander Popov [Tue, 9 Nov 2021 18:05:09 +0000 (21:05 +0300)]
Simplify the check about PTDUMP_DEBUGFS (I was correct)
Alexander Popov [Tue, 9 Nov 2021 18:02:57 +0000 (21:02 +0300)]
Add more checks from grsecurity for cutting attack surface (part II)
This includes:
- KCMP
- RSEQ
- LATENCYTOP
- KCOV
- PROVIDE_OHCI1394_DMA_INIT
- SUNRPC_DEBUG
- FAIL_FUTEX
- KPROBE_EVENTS
- UPROBE_EVENTS
- FUNCTION_TRACER
- STACK_TRACER
- HIST_TRIGGERS
- BLK_DEV_IO_TRACE
Alexander Popov [Tue, 9 Nov 2021 17:20:59 +0000 (20:20 +0300)]
Fix the 'decision' field of the IO_URING check
grsecurity disables IO_URING as well to cut attack surface
Alexander Popov [Tue, 9 Nov 2021 17:11:22 +0000 (20:11 +0300)]
Add more checks from grsecurity for cutting attack surface (part I)
This includes:
- PUNIT_ATOM_DEBUG
- ACPI_CONFIGFS
- EDAC_DEBUG
- DRM_I915_DEBUG
- BCACHE_CLOSURES_DEBUG
- DVB_C8SECTPFE
- MTD_SLRAM
- MTD_PHRAM
Alexander Popov [Tue, 9 Nov 2021 16:48:32 +0000 (19:48 +0300)]
Fix the 'decision' field of the KPROBES check
Alexander Popov [Tue, 9 Nov 2021 16:46:18 +0000 (19:46 +0300)]
Add the comment
Alexander Popov [Thu, 23 Sep 2021 12:56:34 +0000 (15:56 +0300)]
Improve the README
Alexander Popov [Thu, 23 Sep 2021 12:35:20 +0000 (15:35 +0300)]
Get a bit more coverage
Alexander Popov [Thu, 23 Sep 2021 12:01:36 +0000 (15:01 +0300)]
Update the README
Ready for the release 0.5.14.
Alexander Popov [Wed, 22 Sep 2021 10:50:11 +0000 (13:50 +0300)]
Move 'self_protection' & 'maintainer' higher
Alexander Popov [Tue, 21 Sep 2021 19:29:22 +0000 (22:29 +0300)]
Add HARDENED_USERCOPY_PAGESPAN check from KSPP
Alexander Popov [Tue, 21 Sep 2021 18:35:12 +0000 (21:35 +0300)]
Add comments about the maintainer recommendations
Refers to #53
Alexander Popov [Tue, 21 Sep 2021 18:19:51 +0000 (21:19 +0300)]
Fix UBSAN_BOUNDS recommendations
Thanks to @kees and @equaeghe
Refers to #53
Alexander Popov [Tue, 21 Sep 2021 17:44:17 +0000 (20:44 +0300)]
RANDOMIZE_KSTACK_OFFSET_DEFAULT is recommended by KSPP
Thanks to @anthraxx
Alexander Popov [Thu, 16 Sep 2021 18:01:57 +0000 (21:01 +0300)]
Update the KSPP recommendations
Alexander Popov [Thu, 16 Sep 2021 16:54:35 +0000 (19:54 +0300)]
Add defconfigs for Linux v5.14
Alexander Popov [Fri, 10 Sep 2021 21:26:54 +0000 (00:26 +0300)]
Merge pull request #54 from evdenis/master
Recommend disabling CONFIG_BLK_DEV_FD ( thanks to @evdenis )
Denis Efremov [Fri, 10 Sep 2021 12:30:04 +0000 (15:30 +0300)]
Add BLK_DEV_FD
Floppy driver was written many years ago. It was designed to
work in a single-threaded environment (many global variables)
and to work on real hardware which has significant delays
(floppy drives are slow). Nowadays, when we use virtual
devices (which are fast) and multi-core cpus, floppy driver
shows its problems including deadlocking/livelocking and
other security-related issues. However, we can't just
rewrite it because lack of real hardware and compatibility
with existing userspace tools, many of which rely on
undocumented driver behavior.
Here are some CVEs related to floppy driver:
- CVE-2014-1737 privileges escalation in FDRAWCMD ioctl
- CVE-2014-1738 info leak from kernel heap in FDRAWCMD ioctl
- CVE-2018-7755 kernel pointer lead in FDGETPRM ioctl
- CVE-2019-14283 integer overflow and out-of-bounds read in set_geometry
- CVE-2019-14284 denial of service in setup_format_params
- CVE-2020-9383 out-of-bounds read in set_fdc
- CVE-2021-20261 race condition in floppy_revalidate,
floppy_check_events
As pointed by Linus [1]:
> The only users are virtualization, and even they are going away
> because floppies are so small, and other things have become more
> standard anyway (ie USB disk) or easier to emulate (NVMe or whatever).
> So I suspect the only reason floppy is used even in that area is just
> legacy "we haven't bothered updating to anything better and we have
> old scripts and images that work".
CONFIG_BLK_DEV_FD is not enabled in defconfig on x86_64.
Many distros already require root access for /dev/fd0.
However, qemu (5.2.0) still enables floppy device by default.
[1] https://lore.kernel.org/all/CAHk-=whFAAV_TOLFNnj=wu4mD2L9OvgB6n2sKDdmd8buMKFv8A@mail.gmail.com/
Alexander Popov [Fri, 20 Aug 2021 16:34:35 +0000 (19:34 +0300)]
Add RANDOMIZE_KSTACK_OFFSET_DEFAULT
This refers to the pull request #52.
Thanks to Levente Polyak aka @anthraxx.
Alexander Popov [Sun, 29 Aug 2021 21:16:27 +0000 (00:16 +0300)]
Add CFI_CLANG