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Andrey Ryabinin 0e338c4a3e mm/kasan: fix KASAN poisoning in vrealloc() 
commit 9b47d4eea3 upstream.

A KASAN warning can be triggered when vrealloc() changes the requested
size to a value that is not aligned to KASAN_GRANULE_SIZE.

    ------------[ cut here ]------------
    WARNING: CPU: 2 PID: 1 at mm/kasan/shadow.c:174 kasan_unpoison+0x40/0x48
    ...
    pc : kasan_unpoison+0x40/0x48
    lr : __kasan_unpoison_vmalloc+0x40/0x68
    Call trace:
     kasan_unpoison+0x40/0x48 (P)
     vrealloc_node_align_noprof+0x200/0x320
     bpf_patch_insn_data+0x90/0x2f0
     convert_ctx_accesses+0x8c0/0x1158
     bpf_check+0x1488/0x1900
     bpf_prog_load+0xd20/0x1258
     __sys_bpf+0x96c/0xdf0
     __arm64_sys_bpf+0x50/0xa0
     invoke_syscall+0x90/0x160

Introduce a dedicated kasan_vrealloc() helper that centralizes KASAN
handling for vmalloc reallocations.  The helper accounts for KASAN granule
alignment when growing or shrinking an allocation and ensures that partial
granules are handled correctly.

Use this helper from vrealloc_node_align_noprof() to fix poisoning logic.

[ryabinin.a.a@gmail.com: move kasan_enabled() check, fix build]
  Link: https://lkml.kernel.org/r/20260119144509.32767-1-ryabinin.a.a@gmail.com
Link: https://lkml.kernel.org/r/20260113191516.31015-1-ryabinin.a.a@gmail.com
Fixes: d699440f58 ("mm: fix vrealloc()'s KASAN poisoning logic")
Signed-off-by: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Reported-by: Maciej Żenczykowski <maze@google.com>
Reported-by: <joonki.min@samsung-slsi.corp-partner.google.com>
Closes: https://lkml.kernel.org/r/CANP3RGeuRW53vukDy7WDO3FiVgu34-xVJYkfpm08oLO3odYFrA@mail.gmail.com
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Tested-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Uladzislau Rezki <urezki@gmail.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-02-06 16:55:46 +01:00
arch riscv: compat: fix COMPAT_UTS_MACHINE definition 2026-02-06 16:55:44 +01:00
block block: fix NULL pointer dereference in blk_zone_reset_all_bio_endio() 2026-01-08 10:15:06 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec 2026-01-30 10:28:39 +01:00
Documentation fou: Don't allow 0 for FOU_ATTR_IPPROTO. 2026-01-30 10:28:39 +01:00
drivers gpio: rockchip: Stop calling pinctrl for set_direction 2026-02-06 16:55:45 +01:00
fs efivarfs: fix error propagation in efivar_entry_get() 2026-02-06 16:55:45 +01:00
include mm/kasan: fix KASAN poisoning in vrealloc() 2026-02-06 16:55:46 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:33:50 +02:00
io_uring io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop 2026-01-30 10:28:41 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel sched/deadline: Fix 'stuck' dl_server 2026-02-06 16:55:44 +01:00
lib lib/buildid: use __kernel_read() for sleepable context 2026-01-23 11:18:43 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/kasan: fix KASAN poisoning in vrealloc() 2026-02-06 16:55:46 +01:00
net net: bridge: fix static key check 2026-02-06 16:55:42 +01:00
rust rust: rbtree: fix documentation typo in CursorMut peek_next method 2026-02-06 16:55:44 +01:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:14:50 +01:00
scripts rust: kbuild: give --config-path to rustfmt in .rsi target 2026-02-06 16:55:44 +01:00
security keys/trusted_keys: fix handle passed to tpm_buf_append_name during unseal 2026-01-30 10:28:44 +01:00
sound ASoC: amd: yc: Add DMI quirk for Acer TravelMate P216-41-TCO 2026-02-06 16:55:45 +01:00
tools selftests/bpf: Check for timeout in perf_link test 2026-01-30 10:28:47 +01:00
usr kbuild: uapi: Strip comments before size type check 2025-11-13 15:34:35 -05:00
virt KVM: Disallow toggling KVM_MEM_GUEST_MEMFD on an existing memslot 2026-01-08 10:14:21 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-08-01 09:48:44 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS staging: rtl8712: Remove driver using deprecated API wext 2025-12-07 06:25:02 +09:00
Makefile Linux 6.12.68 2026-01-30 10:28:49 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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 reStructuredText 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.