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Yeoreum Yun abbc99e898 arm64: cpufeature: Move arm64_use_ng_mappings to the .data section to prevent wrong idmap generation 
commit 363cd2b81c upstream.

The PTE_MAYBE_NG macro sets the nG page table bit according to the value
of "arm64_use_ng_mappings". This variable is currently placed in the
.bss section. create_init_idmap() is called before the .bss section
initialisation which is done in early_map_kernel(). Therefore,
data/test_prot in create_init_idmap() could be set incorrectly through
the PAGE_KERNEL -> PROT_DEFAULT -> PTE_MAYBE_NG macros.

   # llvm-objdump-21 --syms vmlinux-gcc | grep arm64_use_ng_mappings
     ffff800082f242a8 g     O .bss    0000000000000001 arm64_use_ng_mappings

The create_init_idmap() function disassembly compiled with llvm-21:

  // create_init_idmap()
  ffff80008255c058: d10103ff     	sub	sp, sp, #0x40
  ffff80008255c05c: a9017bfd     	stp	x29, x30, [sp, #0x10]
  ffff80008255c060: a90257f6     	stp	x22, x21, [sp, #0x20]
  ffff80008255c064: a9034ff4     	stp	x20, x19, [sp, #0x30]
  ffff80008255c068: 910043fd     	add	x29, sp, #0x10
  ffff80008255c06c: 90003fc8     	adrp	x8, 0xffff800082d54000
  ffff80008255c070: d280e06a     	mov	x10, #0x703     // =1795
  ffff80008255c074: 91400409     	add	x9, x0, #0x1, lsl #12 // =0x1000
  ffff80008255c078: 394a4108     	ldrb	w8, [x8, #0x290] ------------- (1)
  ffff80008255c07c: f2e00d0a     	movk	x10, #0x68, lsl #48
  ffff80008255c080: f90007e9     	str	x9, [sp, #0x8]
  ffff80008255c084: aa0103f3     	mov	x19, x1
  ffff80008255c088: aa0003f4     	mov	x20, x0
  ffff80008255c08c: 14000000     	b	0xffff80008255c08c <__pi_create_init_idmap+0x34>
  ffff80008255c090: aa082d56     	orr	x22, x10, x8, lsl #11 -------- (2)

Note (1) is loading the arm64_use_ng_mappings value in w8 and (2) is set
the text or data prot with the w8 value to set PTE_NG bit. If the .bss
section isn't initialized, x8 could include a garbage value and generate
an incorrect mapping.

Annotate arm64_use_ng_mappings as __read_mostly so that it is placed in
the .data section.

Fixes: 84b04d3e6b ("arm64: kernel: Create initial ID map from C code")
Cc: stable@vger.kernel.org # 6.9.x
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Link: https://lore.kernel.org/r/20250502180412.3774883-1-yeoreum.yun@arm.com
[catalin.marinas@arm.com: use __read_mostly instead of __ro_after_init]
[catalin.marinas@arm.com: slight tweaking of the code comment]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-05-18 08:24:54 +02:00
arch arm64: cpufeature: Move arm64_use_ng_mappings to the .data section to prevent wrong idmap generation 2025-05-18 08:24:54 +02:00
block blk-mq: create correct map for fallback case 2025-05-09 09:50:48 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: Kconfig - Select LIB generic option 2025-05-02 07:59:33 +02:00
Documentation bpf: Add namespace to BPF internal symbols 2025-05-02 07:59:04 +02:00
drivers accel/ivpu: Increase state dump msg timeout 2025-05-18 08:24:54 +02:00
fs smb: client: Avoid race in open_cached_dir with lease breaks 2025-05-18 08:24:54 +02:00
include mm: vmalloc: support more granular vrealloc() sizing 2025-05-18 08:24:51 +02:00
init rust: clean Rust 1.88.0's unnecessary_transmutes lint 2025-05-18 08:24:51 +02:00
io_uring io_uring: ensure deferred completions are flushed for multishot 2025-05-18 08:24:52 +02:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-05 14:03:02 +01:00
kernel kernel: globalize lookup_or_create_module_kobject() 2025-05-09 09:50:52 +02:00
lib crypto: lib/Kconfig - Hide arch options from user 2025-05-02 07:59:32 +02:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/huge_memory: fix dereferencing invalid pmd migration entry 2025-05-18 08:24:51 +02:00
net net: export a helper for adding up queue stats 2025-05-18 08:24:50 +02:00
rust rust: clean Rust 1.88.0's unnecessary_transmutes lint 2025-05-18 08:24:51 +02:00
samples tracing: Verify event formats that have "%*p.." 2025-05-02 07:58:52 +02:00
scripts objtool: Silence more KCOV warnings, part 2 2025-05-02 07:59:33 +02:00
security landlock: Prepare to add second errata 2025-04-20 10:15:56 +02:00
sound ASoC: simple-card-utils: Fix pointer check in graph_util_parse_link_direction 2025-05-09 09:50:46 +02:00
tools selftests/mm: fix a build failure on powerpc 2025-05-18 08:24:52 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 13:02:18 +01:00
virt KVM: Allow building irqbypass.ko as as module when kvm.ko is a module 2025-04-20 10:15:54 +02:00
.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: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-18 08:24:51 +02:00
.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 MAINTAINERS: add entry for the Rust alloc module 2025-03-13 13:01:47 +01:00
Makefile Linux 6.12.28 2025-05-09 09:50:53 +02:00
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.