Re: [PATCH v6 02/33] mm: helper `is_shadow_stack_vma` to check shadow stack vma
From: Mark Brown <broonie@kernel.org>
Date: 2024-10-09 11:11:35
Also in:
linux-arch, linux-devicetree, linux-fsdevel, linux-kselftest, linux-mm, linux-riscv, lkml
On Tue, Oct 08, 2024 at 03:36:44PM -0700, Deepak Gupta wrote:
VM_SHADOW_STACK (alias to VM_HIGH_ARCH_5) is used to encode shadow stack VMA on three architectures (x86 shadow stack, arm GCS and RISC-V shadow stack). In case architecture doesn't implement shadow stack, it's VM_NONE Introducing a helper `is_shadow_stack_vma` to determine shadow stack vma or not.
Not that it makes any difference but the arm64 eneded up defining VM_SHADOW_STACK to VM_HIGH_ARCH_6.
Signed-off-by: Deepak Gupta <redacted> --- mm/gup.c | 2 +- mm/vma.h | 10 +++++++--- 2 files changed, 8 insertions(+), 4 deletions(-)
There's another test of VM_SHADOW_STACK in mainline now, added by my
change df7e1286b1dc3d6c ("mm: care about shadow stack guard gap when
getting an unmapped area") - sorry, I should've remembered this change
from your series and pulled it into mine.
quoted hunk ↗ jump to hunk
@@ -387,7 +392,6 @@ static inline bool is_data_mapping(vm_flags_t flags) return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE; } - static inline void vma_iter_config(struct vma_iterator *vmi, unsigned long index, unsigned long last)
Unrelated whitespace change.
Attachments
- signature.asc [application/pgp-signature] 488 bytes