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From: Andrew Morton <akpm@linux-foundation.org>
To: ak@linux.intel.com, arnd@arndb.de, dvyukov@google.com,
	gregkh@linuxfoundation.org, jslaby@suse.com, mjg59@google.com,
	mm-commits@vger.kernel.org, penguin-kernel@I-love.SAKURA.ne.jp,
	peterz@infradead.org, pmladek@suse.com, rostedt@goodmis.org,
	sergey.senozhatsky@gmail.com, tytso@mit.edu,
	viro@zeniv.linux.org.uk
Subject: + add-kernel-config-option-for-twisting-kernel-behavior.patch added to -mm tree
Date: Thu, 23 Apr 2020 20:24:12 -0700
Message-ID: <20200424032412.NWp8IKnFW%akpm@linux-foundation.org> (raw)
In-Reply-To: <20200420181310.c18b3c0aa4dc5b3e5ec1be10@linux-foundation.org>


The patch titled
     Subject: add kernel config option for twisting kernel behavior.
has been added to the -mm tree.  Its filename is
     add-kernel-config-option-for-twisting-kernel-behavior.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/add-kernel-config-option-for-twisting-kernel-behavior.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/add-kernel-config-option-for-twisting-kernel-behavior.patch

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Subject: add kernel config option for twisting kernel behavior.

Existing kernel config options are defined based on "whether you want to
enable this module/feature or not". And such granularity is sometimes
too rough-grained for fuzzing tools which try to find bugs inside each
module/feature.

While syzkaller (one of fuzzing tools) is finding many bugs, sometimes
syzkaller examines stupid operations. Some examples of such operations
are: changing console loglevel which in turn makes it impossible to get
kernel messages when a crash happens, freezing filesystems which in turn
causes khungtaskd to needlessly complain, programmatically sending
Ctrl-Alt-Del which in turn causes the system to needlessly reboot.
Currently we prevent syzkaller from examining stupid operations by
blacklisting syscall arguments and/or disabling whole functionality
using existing kernel config options. But such approach is difficult to
maintain and needlessly prevents fuzzers from testing kernel code. [1]

We want fuzzers to test as much coverage as possible while we want
fuzzers not to try stupid operations. To achieve this goal, we want
cooperation from kernel side, and build-time branching (i.e. kernel
config options) will be the simplest and the most reliable.

Therefore, this patch introduces a kernel config option which allows
selecting fine-grained kernel config options for twisting kernel's
behavior. Each fine-grained kernel config option will be added by future
patches. For ease of management, grouping kernel config options for
allowing e.g. syzkaller to select all fine-grained kernel config options
which e.g. syzkaller wants would be added by future patches.

[1] https://lkml.kernel.org/r/CACT4Y+a6KExbggs4mg8pvoD554PcDqQNW4sM15X-tc=YONCzYw@mail.gmail.com

Link: http://lkml.kernel.org/r/20200421131951.4948-1-penguin-kernel@I-love.SAKURA.ne.jp
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Matthew Garrett <mjg59@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: "Theodore Y . Ts'o" <tytso@mit.edu>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/Kconfig.debug |    2 ++
 lib/Kconfig.twist |   13 +++++++++++++
 2 files changed, 15 insertions(+)

--- a/lib/Kconfig.debug~add-kernel-config-option-for-twisting-kernel-behavior
+++ a/lib/Kconfig.debug
@@ -2277,4 +2277,6 @@ config HYPERV_TESTING
 
 endmenu # "Kernel Testing and Coverage"
 
+source "lib/Kconfig.twist"
+
 endmenu # Kernel hacking
--- /dev/null
+++ a/lib/Kconfig.twist
@@ -0,0 +1,13 @@
+menuconfig TWIST_KERNEL_BEHAVIOR
+	bool "Twist kernel behavior"
+	help
+	  Saying Y here allows modifying kernel behavior via kernel
+	  config options which will become visible by selecting this
+	  config option. Since these kernel config options are intended
+	  for helping e.g. fuzz testing, behavior twisted by this kernel
+	  option might be unstable. Userspace applications should not
+	  count on this option being selected.
+
+if TWIST_KERNEL_BEHAVIOR
+
+endif # TWIST_KERNEL_BEHAVIOR
_

Patches currently in -mm which might be from penguin-kernel@I-love.SAKURA.ne.jp are

info-task-hung-in-generic_file_write_iter.patch
info-task-hung-in-generic_file_write-fix.patch
add-kernel-config-option-for-twisting-kernel-behavior.patch
twist-allow-disabling-k_spec-function-in-drivers-tty-vt-keyboardc.patch
twist-add-option-for-selecting-twist-options-for-syzkallers-testing.patch

  parent reply index

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-21  1:13 incoming Andrew Morton
2020-04-21  1:13 ` [patch 01/15] sh: fix build error in mm/init.c Andrew Morton
2020-04-21  1:13 ` [patch 02/15] slub: avoid redzone when choosing freepointer location Andrew Morton
2020-04-21  1:13 ` [patch 03/15] mm/userfaultfd: disable userfaultfd-wp on x86_32 Andrew Morton
2020-04-21  1:13 ` [patch 04/15] MAINTAINERS: add an entry for kfifo Andrew Morton
2020-04-21  1:13 ` [patch 05/15] mm/hugetlb: fix a addressing exception caused by huge_pte_offset Andrew Morton
2020-04-21  1:13 ` [patch 06/15] mm, gup: return EINTR when gup is interrupted by fatal signals Andrew Morton
2020-04-21  1:13 ` [patch 07/15] checkpatch: fix a typo in the regex for $allocFunctions Andrew Morton
2020-04-21  1:14 ` [patch 08/15] tools/build: tweak unused value workaround Andrew Morton
2020-04-21  1:14 ` [patch 09/15] mm/ksm: fix NULL pointer dereference when KSM zero page is enabled Andrew Morton
2020-04-21  1:14 ` [patch 10/15] mm/shmem: fix build without THP Andrew Morton
2020-04-21  1:14 ` [patch 11/15] vmalloc: fix remap_vmalloc_range() bounds checks Andrew Morton
2020-04-21  1:14 ` [patch 12/15] shmem: fix possible deadlocks on shmlock_user_lock Andrew Morton
2020-04-21  1:14 ` [patch 13/15] mm: shmem: disable interrupt when acquiring info->lock in userfaultfd_copy path Andrew Morton
2020-04-21  1:14 ` [patch 14/15] coredump: fix null pointer dereference on coredump Andrew Morton
2020-04-21  1:14 ` [patch 15/15] tools/vm: fix cross-compile build Andrew Morton
2020-04-21  2:00 ` + mm-memory_hotplug-refrain-from-adding-memory-into-an-impossible-node.patch added to -mm tree Andrew Morton
2020-04-21  2:48 ` + x86-mm-define-mm_p4d_folded.patch " Andrew Morton
2020-04-21  2:52 ` + mm-debug-add-tests-validating-architecture-page-table-helpers-v17.patch " Andrew Morton
2020-04-21  2:59 ` + mm-mmapc-add-more-sanity-checks-to-get_unmapped_area.patch " Andrew Morton
2020-04-21  2:59 ` + mm-mmapc-do-not-allow-mappings-outside-of-allowed-limits.patch " Andrew Morton
2020-04-21  3:07 ` + initrdmem=-option-to-specify-initrd-physical-address-checkpatch-fixes.patch " Andrew Morton
2020-04-21  3:58 ` + initrdmem=-option-to-specify-initrd-physical-address.patch " Andrew Morton
2020-04-21  5:43 ` mmotm 2020-04-20-22-43 uploaded Andrew Morton
2020-04-22  1:36 ` + mm-swapfilec-found_free-could-be-represented-by-tmp-max.patch added to -mm tree Andrew Morton
2020-04-22  1:36 ` + mm-swapfilec-tmp-is-always-smaller-than-max.patch " Andrew Morton
2020-04-22  1:36 ` + mm-swapfilec-omit-a-duplicate-code-by-compare-tmp-and-max-first.patch " Andrew Morton
2020-04-23 22:36 ` + kasan-initialise-array-in-kasan_memcmp-test.patch " Andrew Morton
2020-04-23 22:38 ` + kvm-svm-change-flag-passed-to-gup-fast-in-sev_pin_memory.patch " Andrew Morton
2020-04-23 22:41 ` + mm-pass-task-and-mm-to-do_madvise-fix.patch " Andrew Morton
2020-04-23 22:44 ` + mm-support-vector-address-ranges-for-process_madvise.patch " Andrew Morton
2020-04-23 22:44 ` + mm-support-vector-address-ranges-for-process_madvise-fix.patch " Andrew Morton
2020-04-23 22:48 ` + kasan-stop-tests-being-eliminated-as-dead-code-with-fortify_source.patch " Andrew Morton
2020-04-23 22:48 ` + stringh-fix-incompatibility-between-fortify_source-and-kasan.patch " Andrew Morton
2020-04-23 23:03 ` + powerpc-add-support-for-folded-p4d-page-tables-fix.patch " Andrew Morton
2020-04-23 23:09 ` [folded-merged] memcg-optimize-memorynuma_stat-like-memorystat-fix.patch removed from " Andrew Morton
2020-04-23 23:32 ` + slub-remove-userspace-notifier-for-cache-add-remove.patch added to " Andrew Morton
2020-04-23 23:35 ` + ocfs2-mount-shared-volume-without-ha-stack.patch " Andrew Morton
2020-04-24  0:29 ` + mm-memory_hotplug-handle-memblocks-only-with-config_arch_keep_memblock.patch " Andrew Morton
2020-04-24  1:17 ` + mm-return-true-in-cpupid_pid_unset.patch " Andrew Morton
2020-04-24  1:20 ` + kernel-better-document-the-use_mm-unuse_mm-api-contract-v2-fix.patch " Andrew Morton
2020-04-24  1:40 ` + mm-thp-rename-pmd_mknotpresent-as-pmd_mkinvalid-v2.patch " Andrew Morton
2020-04-24  1:47 ` + ipc-convert-ipcs_idr-to-xarray-update.patch " Andrew Morton
     [not found]   ` <20200605195848.GB5393@lca.pw>
     [not found]     ` <20200605201134.GJ19604@bombadil.infradead.org>
2020-06-05 21:20       ` Andrew Morton
2020-12-30 15:44   ` Manfred Spraul
2020-04-24  2:06 ` + powerpc-spufs-simplify-spufs-core-dumping.patch " Andrew Morton
2020-04-24  2:06 ` + signal-factor-copy_siginfo_to_external32-from-copy_siginfo_to_user32.patch " Andrew Morton
2020-04-24  2:06 ` + binfmt_elf-femove-the-set_fs-in-fill_siginfo_note.patch " Andrew Morton
2020-04-24  2:06 ` + binfmt_elf-remove-the-set_fskernel_ds-in-elf_core_dump.patch " Andrew Morton
2020-04-24  2:06 ` + binfmt_elf_fdpic-remove-the-set_fskernel_ds-in-elf_fdpic_core_dump.patch " Andrew Morton
2020-04-24  2:06 ` + exec-simplify-the-copy_strings_kernel-calling-convention.patch " Andrew Morton
2020-04-24  2:06 ` + exec-open-code-copy_string_kernel.patch " Andrew Morton
2020-04-24  3:24 ` Andrew Morton [this message]
2020-04-24  3:24 ` + twist-allow-disabling-k_spec-function-in-drivers-tty-vt-keyboardc.patch " Andrew Morton
2020-04-24  3:24 ` + twist-add-option-for-selecting-twist-options-for-syzkallers-testing.patch " Andrew Morton
2020-04-24  3:32 ` + eventpoll-fix-missing-wakeup-for-ovflist-in-ep_poll_callback.patch " Andrew Morton
2020-04-24  3:49 ` [obsolete] linux-next-rejects.patch removed from " Andrew Morton
2020-04-24  3:51 ` + mips-mm-add-page-soft-dirty-tracking.patch added to " Andrew Morton
2020-04-24 23:36 ` + mm-memory_hotplug-set-node_start_pfn-of-hotadded-pgdat-to-0.patch " Andrew Morton
2020-04-26  0:09 ` + mm-switch-the-test_vmalloc-module-to-use-__vmalloc_node-fix-fix.patch " Andrew Morton
2020-04-26  0:17 ` + mm-hugetlb-avoid-unnecessary-check-on-pud-and-pmd-entry-in-huge_pte_offset.patch " Andrew Morton
2020-04-26  0:29 ` + eventpoll-fix-missing-wakeup-for-ovflist-in-ep_poll_callback-v2.patch " Andrew Morton
2020-04-26  0:41 ` [withdrawn] kasan-initialise-array-in-kasan_memcmp-test.patch removed from " Andrew Morton
2020-04-26  0:41 ` + kasan-stop-tests-being-eliminated-as-dead-code-with-fortify_source-v4.patch added to " Andrew Morton
2020-04-26  0:48 ` + checkpatch-test-git_dir-changes.patch " Andrew Morton
2020-04-26  1:06 ` + mm-add-debug_wx-support.patch " Andrew Morton
2020-04-26  1:06 ` + riscv-support-debug_wx.patch " Andrew Morton
2020-04-26  1:06 ` + riscv-support-debug_wx-fix.patch " Andrew Morton
2020-04-26  1:06 ` + x86-mm-use-arch_has_debug_wx-instead-of-arch-defined.patch " Andrew Morton
2020-04-26  1:06 ` + arm64-mm-use-arch_has_debug_wx-instead-of-arch-defined.patch " Andrew Morton
2020-04-26  1:09 ` [folded-merged] initrdmem=-option-to-specify-initrd-physical-address-checkpatch-fixes.patch removed from " Andrew Morton

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