diff options
| author | Mark Brown <broonie@kernel.org> | 2024-10-02 01:58:54 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2024-10-04 14:04:36 +0300 |
| commit | 6497b66ba6945f142902c7e8fce86e47016ead1c (patch) | |
| tree | 2cad92c241d5309be6787a006d81c0781a15c389 /arch/arm64/include/asm | |
| parent | ae80e1629aeaf5be726a9ea94eb7345b1a44b00d (diff) | |
| download | linux-6497b66ba6945f142902c7e8fce86e47016ead1c.tar.xz | |
arm64/mm: Map pages for guarded control stack
Map pages flagged as being part of a GCS as such rather than using the
full set of generic VM flags.
This is done using a conditional rather than extending the size of
protection_map since that would make for a very sparse array.
Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241001-arm64-gcs-v13-15-222b78d87eee@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm')
| -rw-r--r-- | arch/arm64/include/asm/mman.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h index 03b790fd0ad8..f6d784f8e6e0 100644 --- a/arch/arm64/include/asm/mman.h +++ b/arch/arm64/include/asm/mman.h @@ -71,6 +71,15 @@ static inline bool arch_validate_flags(unsigned long vm_flags) return false; } + if (system_supports_gcs() && (vm_flags & VM_SHADOW_STACK)) { + /* An executable GCS isn't a good idea. */ + if (vm_flags & VM_EXEC) + return false; + + /* The memory management core should prevent this */ + VM_WARN_ON(vm_flags & VM_SHARED); + } + return true; } |