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Guenter Roeck d8c42a6e61 mm/slub, kunit: Use inverted data to corrupt kmem cache 
[ Upstream commit b1080c667b ]

Two failure patterns are seen randomly when running slub_kunit tests with
CONFIG_SLAB_FREELIST_RANDOM and CONFIG_SLAB_FREELIST_HARDENED enabled.

Pattern 1:
     # test_clobber_zone: pass:1 fail:0 skip:0 total:1
     ok 1 test_clobber_zone
     # test_next_pointer: EXPECTATION FAILED at lib/slub_kunit.c:72
     Expected 3 == slab_errors, but
         slab_errors == 0 (0x0)
     # test_next_pointer: EXPECTATION FAILED at lib/slub_kunit.c:84
     Expected 2 == slab_errors, but
         slab_errors == 0 (0x0)
     # test_next_pointer: pass:0 fail:1 skip:0 total:1
     not ok 2 test_next_pointer

In this case, test_next_pointer() overwrites p[s->offset], but the data
at p[s->offset] is already 0x12.

Pattern 2:
     ok 1 test_clobber_zone
     # test_next_pointer: EXPECTATION FAILED at lib/slub_kunit.c:72
     Expected 3 == slab_errors, but
         slab_errors == 2 (0x2)
     # test_next_pointer: pass:0 fail:1 skip:0 total:1
     not ok 2 test_next_pointer

In this case, p[s->offset] has a value other than 0x12, but one of the
expected failures is nevertheless missing.

Invert data instead of writing a fixed value to corrupt the cache data
structures to fix the problem.

Fixes: 1f9f78b1b3 ("mm/slub, kunit: add a KUnit test for SLUB debugging functionality")
Cc: Oliver Glitta <glittao@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
CC: Daniel Latypov <dlatypov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-06-12 11:11:31 +02:00
arch x86/mm: Remove broken vsyscall emulation code from the page fault code 2024-06-12 11:11:29 +02:00
block block: add a partscan sysfs attribute for disks 2024-05-25 16:22:55 +02:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto KEYS: asymmetric: Add missing dependencies of FIPS_SIGNATURE_SELFTEST 2024-06-12 11:11:22 +02:00
Documentation ASoC: dt-bindings: rt5645: add cbj sleeve gpio property 2024-06-12 11:11:26 +02:00
drivers crypto: bcm - Fix pointer arithmetic 2024-06-12 11:11:31 +02:00
fs openpromfs: finish conversion to the new mount API 2024-06-12 11:11:30 +02:00
include cpu: Ignore "mitigations" kernel parameter if CPU_MITIGATIONS=n 2024-06-12 11:11:24 +02:00
init rust: make mutually exclusive with CFI_CLANG 2024-05-02 16:32:42 +02:00
io_uring io_uring: fail NOP if non-zero op flags is passed in 2024-06-12 11:11:18 +02:00
ipc Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
kernel softirq: Fix suspicious RCU usage in __do_softirq() 2024-06-12 11:11:27 +02:00
lib mm/slub, kunit: Use inverted data to corrupt kmem cache 2024-06-12 11:11:31 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/hugetlb: fix DEBUG_LOCKS_WARN_ON(1) when dissolve_free_hugetlb_folio() 2024-05-17 12:02:39 +02:00
net wifi: cfg80211: fix the order of arguments for trace events of the tx_rx_evt class 2024-06-12 11:11:22 +02:00
rust rust: kernel: require Send for Module implementations 2024-05-17 12:01:56 +02:00
samples work around gcc bugs with 'asm goto' with outputs 2024-02-23 09:24:47 +01:00
scripts kbuild: Disable KCSAN for autogenerated *.mod.c intermediaries 2024-05-17 12:02:12 +02:00
security KEYS: trusted: Do not use WARN when encode fails 2024-05-25 16:22:55 +02:00
sound ALSA: hda: intel-dsp-config: harden I2C/I2S codec detection 2024-06-12 11:11:28 +02:00
tools KVM: selftests: Add test for uaccesses to non-existent vgic-v2 CPUIF 2024-06-12 11:11:27 +02:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt KVM: Always flush async #PF workqueue when vCPU is being destroyed 2024-04-03 15:28:18 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: rename binkernel.spec to kernel.spec 2023-07-25 00:59:33 +09:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.rustfmt.toml
COPYING
CREDITS USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig
MAINTAINERS ALSA: scarlett2: Rename scarlett_gen2 to scarlett2 2024-04-27 17:11:36 +02:00
Makefile Linux 6.6.32 2024-05-25 16:22:56 +02:00
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.