kernel/linux.git/lib/Kconfig.debug, branch v4.14.149

kmemleak: increase DEBUG_KMEMLEAK_EARLY_LOG_SIZE default to 16K

2019-10-07T16:55:15+00:00

[ Upstream commit b751c52bb587ae66f773b15204ef7a147467f4c7 ] The current default value (400) is too low on many systems (e.g. some ARM64 platform takes up 1000+ entries). syzbot uses 16000 as default value, and has proved to be enough on beefy configurations, so let's pick that value. This consumes more RAM on boot (each entry is 160 bytes, so in total ~2.5MB of RAM), but the memory would later be freed (early_log is __initdata). Link: http://lkml.kernel.org/r/20190730154027.101525-1-drinkcat@chromium.org Signed-off-by: Nicolas Boichat Suggested-by: Dmitry Vyukov Acked-by: Catalin Marinas Acked-by: Dmitry Vyukov Cc: Masahiro Yamada Cc: Kees Cook Cc: Petr Mladek Cc: Thomas Gleixner Cc: Tetsuo Handa Cc: Joe Lawrence Cc: Uladzislau Rezki Cc: Andy Shevchenko Cc: Stephen Rothwell Cc: Andrey Ryabinin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin

lib/Kconfig.debug: fix build error without CONFIG_BLOCK

2019-05-02T07:40:28+00:00

commit ae3d6a323347940f0548bbb4b17f0bb2e9164169 upstream. If CONFIG_TEST_KMOD is set to M, while CONFIG_BLOCK is not set, XFS and BTRFS can not be compiled successly. Link: http://lkml.kernel.org/r/20190410075434.35220-1-yuehaibing@huawei.com Fixes: d9c6a72d6fa2 ("kmod: add test driver to stress test the module loader") Signed-off-by: YueHaibing Reported-by: Hulk Robot Reviewed-by: Kees Cook Cc: Masahiro Yamada Cc: Petr Mladek Cc: Andy Shevchenko Cc: Matthew Wilcox Cc: Joe Lawrence Cc: Robin Murphy Cc: Luis Chamberlain Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

kmemcheck: rip it out

2018-02-22T14:42:24+00:00

commit 4675ff05de2d76d167336b368bd07f3fef6ed5a6 upstream. Fix up makefiles, remove references, and git rm kmemcheck. Link: http://lkml.kernel.org/r/20171007030159.22241-4-alexander.levin@verizon.com Signed-off-by: Sasha Levin Cc: Steven Rostedt Cc: Vegard Nossum Cc: Pekka Enberg Cc: Michal Hocko Cc: Eric W. Biederman Cc: Alexander Potapenko Cc: Tim Hansen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

kasan: rework Kconfig settings

2018-02-16T19:23:04+00:00

commit e7c52b84fb18f08ce49b6067ae6285aca79084a8 upstream. We get a lot of very large stack frames using gcc-7.0.1 with the default -fsanitize-address-use-after-scope --param asan-stack=1 options, which can easily cause an overflow of the kernel stack, e.g. drivers/gpu/drm/i915/gvt/handlers.c:2434:1: warning: the frame size of 46176 bytes is larger than 3072 bytes drivers/net/wireless/ralink/rt2x00/rt2800lib.c:5650:1: warning: the frame size of 23632 bytes is larger than 3072 bytes lib/atomic64_test.c:250:1: warning: the frame size of 11200 bytes is larger than 3072 bytes drivers/gpu/drm/i915/gvt/handlers.c:2621:1: warning: the frame size of 9208 bytes is larger than 3072 bytes drivers/media/dvb-frontends/stv090x.c:3431:1: warning: the frame size of 6816 bytes is larger than 3072 bytes fs/fscache/stats.c:287:1: warning: the frame size of 6536 bytes is larger than 3072 bytes To reduce this risk, -fsanitize-address-use-after-scope is now split out into a separate CONFIG_KASAN_EXTRA Kconfig option, leading to stack frames that are smaller than 2 kilobytes most of the time on x86_64. An earlier version of this patch also prevented combining KASAN_EXTRA with KASAN_INLINE, but that is no longer necessary with gcc-7.0.1. All patches to get the frame size below 2048 bytes with CONFIG_KASAN=y and CONFIG_KASAN_EXTRA=n have been merged by maintainers now, so we can bring back that default now. KASAN_EXTRA=y still causes lots of warnings but now defaults to !COMPILE_TEST to disable it in allmodconfig, and it remains disabled in all other defconfigs since it is a new option. I arbitrarily raise the warning limit for KASAN_EXTRA to 3072 to reduce the noise, but an allmodconfig kernel still has around 50 warnings on gcc-7. I experimented a bit more with smaller stack frames and have another follow-up series that reduces the warning limit for 64-bit architectures to 1280 bytes (without CONFIG_KASAN). With earlier versions of this patch series, I also had patches to address the warnings we get with KASAN and/or KASAN_EXTRA, using a "noinline_if_stackbloat" annotation. That annotation now got replaced with a gcc-8 bugfix (see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715) and a workaround for older compilers, which means that KASAN_EXTRA is now just as bad as before and will lead to an instant stack overflow in a few extreme cases. This reverts parts of commit 3f181b4d8652 ("lib/Kconfig.debug: disable -Wframe-larger-than warnings with KASAN=y"). Two patches in linux-next should be merged first to avoid introducing warnings in an allmodconfig build: 3cd890dbe2a4 ("media: dvb-frontends: fix i2c access helpers for KASAN") 16c3ada89cff ("media: r820t: fix r820t_write_reg for KASAN") Do we really need to backport this? I think we do: without this patch, enabling KASAN will lead to unavoidable kernel stack overflow in certain device drivers when built with gcc-7 or higher on linux-4.10+ or any version that contains a backport of commit c5caf21ab0cf8. Most people are probably still on older compilers, but it will get worse over time as they upgrade their distros. The warnings we get on kernels older than this should all be for code that uses dangerously large stack frames, though most of them do not cause an actual stack overflow by themselves.The asan-stack option was added in linux-4.0, and commit 3f181b4d8652 ("lib/Kconfig.debug: disable -Wframe-larger-than warnings with KASAN=y") effectively turned off the warning for allmodconfig kernels, so I would like to see this fix backported to any kernels later than 4.0. I have done dozens of fixes for individual functions with stack frames larger than 2048 bytes with asan-stack, and I plan to make sure that all those fixes make it into the stable kernels as well (most are already there). Part of the complication here is that asan-stack (from 4.0) was originally assumed to always require much larger stacks, but that turned out to be a combination of multiple gcc bugs that we have now worked around and fixed, but sanitize-address-use-after-scope (from v4.10) has a much higher inherent stack usage and also suffers from at least three other problems that we have analyzed but not yet fixed upstream, each of them makes the stack usage more severe than it should be. Link: http://lkml.kernel.org/r/20171221134744.2295529-1-arnd@arndb.de Signed-off-by: Arnd Bergmann Acked-by: Andrey Ryabinin Cc: Mauro Carvalho Chehab Cc: Andrey Ryabinin Cc: Alexander Potapenko Cc: Dmitry Vyukov Cc: Andrey Konovalov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman

x86/unwind: Rename unwinder config options to 'CONFIG_UNWINDER_*'

2017-12-25T13:26:13+00:00

commit 11af847446ed0d131cf24d16a7ef3d5ea7a49554 upstream. Rename the unwinder config options from: CONFIG_ORC_UNWINDER CONFIG_FRAME_POINTER_UNWINDER CONFIG_GUESS_UNWINDER to: CONFIG_UNWINDER_ORC CONFIG_UNWINDER_FRAME_POINTER CONFIG_UNWINDER_GUESS ... in order to give them a more logical config namespace. Suggested-by: Ingo Molnar Signed-off-by: Josh Poimboeuf Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/73972fc7e2762e91912c6b9584582703d6f1b8cc.1507924831.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman

Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2017-10-14T19:14:20+00:00

Pull locking fixes from Ingo Molnar: "Two lockdep fixes for bugs introduced by the cross-release dependency tracking feature - plus a commit that disables it because performance regressed in an absymal fashion on some systems" * 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: locking/lockdep: Disable cross-release features for now locking/selftest: Avoid false BUG report locking/lockdep: Fix stacktrace mess

locking/lockdep: Disable cross-release features for now

2017-10-14T10:50:26+00:00

Johan Hovold reported a big lockdep slowdown on his system, caused by lockdep: > I had noticed that the BeagleBone Black boot time appeared to have > increased significantly with 4.14 and yesterday I finally had time to > investigate it. > > Boot time (from "Linux version" to login prompt) had in fact doubled > since 4.13 where it took 17 seconds (with my current config) compared to > the 35 seconds I now see with 4.14-rc4. > > I quick bisect pointed to lockdep and specifically the following commit: > > 28a903f63ec0 ("locking/lockdep: Handle non(or multi)-acquisition of a crosslock") Because the final v4.14 release is close, disable the cross-release lockdep features for now. Bisected-by: Johan Hovold Debugged-by: Johan Hovold Reported-by: Johan Hovold Cc: Arnd Bergmann Cc: Byungchul Park Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Tony Lindgren Cc: kernel-team@lge.com Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mm@kvack.org Cc: linux-omap@vger.kernel.org Link: http://lkml.kernel.org/r/20171014072659.f2yr6mhm5ha3eou7@gmail.com Signed-off-by: Ingo Molnar

lib/Kconfig.debug: kernel hacking menu: runtime testing: keep tests together

2017-10-13T23:18:32+00:00

Expand the "Runtime testing" menu by including more entries inside it instead of after it. This is just Kconfig symbol movement. This causes the (arch-independent) Runtime tests to be presented (listed) all in one place instead of in multiple places. Link: http://lkml.kernel.org/r/c194e5c4-2042-bf94-a2d8-7aa13756e257@infradead.org Signed-off-by: Randy Dunlap Acked-by: Kees Cook Cc: Dave Hansen Cc: "Luis R. Rodriguez" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

parisc: Fix too large frame size warnings

2017-09-22T17:46:07+00:00

The parisc architecture has larger stack frames than most other architectures on 32-bit kernels. Increase the maximum allowed stack frame to 1280 bytes for parisc to avoid warnings in the do_sys_poll() and pat_memconfig() functions. Signed-off-by: Helge Deller

lib: add test module for CONFIG_DEBUG_VIRTUAL

2017-09-09T01:26:49+00:00

Add a test module that allows testing that CONFIG_DEBUG_VIRTUAL works correctly, at least that it can catch invalid calls to virt_to_phys() against the non-linear kernel virtual address map. Link: http://lkml.kernel.org/r/20170808164035.26725-1-f.fainelli@gmail.com Signed-off-by: Florian Fainelli Cc: "Luis R. Rodriguez" Cc: Kees Cook Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds