WSL2-Linux-Kernel

The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)

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Peter Collingbourne 758cabae31 kasan: test: add memcpy test that avoids out-of-bounds write With HW tag-based KASAN, error checks are performed implicitly by the load and store instructions in the memcpy implementation. A failed check results in tag checks being disabled and execution will keep going. As a result, under HW tag-based KASAN, prior to commit `1b0668be62` ("kasan: test: disable kmalloc_memmove_invalid_size for HW_TAGS"), this memcpy would end up corrupting memory until it hits an inaccessible page and causes a kernel panic. This is a pre-existing issue that was revealed by commit `285133040e` ("arm64: Import latest memcpy()/memmove() implementation") which changed the memcpy implementation from using signed comparisons (incorrectly, resulting in the memcpy being terminated early for negative sizes) to using unsigned comparisons. It is unclear how this could be handled by memcpy itself in a reasonable way. One possibility would be to add an exception handler that would force memcpy to return if a tag check fault is detected -- this would make the behavior roughly similar to generic and SW tag-based KASAN. However, this wouldn't solve the problem for asynchronous mode and also makes memcpy behavior inconsistent with manually copying data. This test was added as a part of a series that taught KASAN to detect negative sizes in memory operations, see commit `8cceeff48f` ("kasan: detect negative size in memory operation function"). Therefore we should keep testing for negative sizes with generic and SW tag-based KASAN. But there is some value in testing small memcpy overflows, so let's add another test with memcpy that does not destabilize the kernel by performing out-of-bounds writes, and run it in all modes. Link: https://linux-review.googlesource.com/id/I048d1e6a9aff766c4a53f989fb0c83de68923882 Link: https://lkml.kernel.org/r/20210910211356.3603758-1-pcc@google.com Signed-off-by: Peter Collingbourne <pcc@google.com> Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com> Acked-by: Marco Elver <elver@google.com> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Alexander Potapenko <glider@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2021-11-06 13:30:33 -07:00
Documentation	Networking fixes for 5.15-rc8/final, including fixes from WiFi	2021-10-28 10:17:31 -07:00
LICENSES	…
arch	* Fixes for s390 interrupt delivery	2021-10-31 11:19:02 -07:00
block	block-5.15-2021-10-29	2021-10-29 11:10:29 -07:00
certs	…
crypto	…
drivers	mm: move kvmalloc-related functions to slab.h	2021-11-06 13:30:32 -07:00
fs	d_path: fix Kernel doc validator complaining	2021-11-06 13:30:32 -07:00
include	kasan: generic: introduce kasan_record_aux_stack_noalloc()	2021-11-06 13:30:33 -07:00
init	mm: disable NUMA_BALANCING_DEFAULT_ENABLED and TRANSPARENT_HUGEPAGE on PREEMPT_RT	2021-11-06 13:30:33 -07:00
ipc	…
kernel	workqueue, kasan: avoid alloc_pages() when recording stack	2021-11-06 13:30:33 -07:00
lib	kasan: test: add memcpy test that avoids out-of-bounds write	2021-11-06 13:30:33 -07:00
mm	kasan: fix tag for large allocations when using CONFIG_SLAB	2021-11-06 13:30:33 -07:00
net	mptcp: fix corrupt receiver key in MPC + data + checksum	2021-10-28 08:19:06 -07:00
samples	…
scripts	scripts/decodecode: fix faulting instruction no print when opps.file is DOS format	2021-11-06 13:30:32 -07:00
security	…
sound	…
tools	perf script: Fix PERF_SAMPLE_WEIGHT_STRUCT support	2021-10-31 12:51:41 -03:00
usr	…
virt	…
.clang-format	…
.cocciconfig	…
.get_maintainer.ignore	…
.gitattributes	…
.gitignore	…
.mailmap	…
COPYING	…
CREDITS	…
Kbuild	…
Kconfig	…
MAINTAINERS	drm fixes for 5.15 final	2021-10-28 12:17:01 -07:00
Makefile	Linux 5.15	2021-10-31 13:53:10 -07:00
README	…

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.