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Move the arm64_use_ng_mappings variable from the .bss to the .data

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section as it is accessed very early during boot with the MMU off and
 before the .bss has been initialised. This can lead to incorrect idmap
 page table.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fix from Catalin Marinas:
 "Move the arm64_use_ng_mappings variable from the .bss to the .data
  section as it is accessed very early during boot with the MMU off and
  before the .bss has been initialised.

  This could lead to incorrect idmap page table"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: cpufeature: Move arm64_use_ng_mappings to the .data section to prevent wrong idmap generation
This commit is contained in:
Linus Torvalds 2025-05-09 11:30:26 -07:00
commit 50358c251e
1 changed files with 8 additions and 1 deletions
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9
arch/arm64/kernel/cpufeature.c
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@ -114,7 +114,14 @@ static struct arm64_cpu_capabilities const __ro_after_init *cpucap_ptrs[ARM64_NC
DECLARE_BITMAP(boot_cpucaps, ARM64_NCAPS);
bool arm64_use_ng_mappings = false;
/*
* arm64_use_ng_mappings must be placed in the .data section, otherwise it
* ends up in the .bss section where it is initialized in early_map_kernel()
* after the MMU (with the idmap) was enabled. create_init_idmap() - which
* runs before early_map_kernel() and reads the variable via PTE_MAYBE_NG -
* may end up generating an incorrect idmap page table attributes.
*/
bool arm64_use_ng_mappings __read_mostly = false;
EXPORT_SYMBOL(arm64_use_ng_mappings);
DEFINE_PER_CPU_READ_MOSTLY(const char *, this_cpu_vector) = vectors;