[PATCH 1/8] arm64: Enable VMAP_STACK support

[Breno Leitao <leitao@debian.org>]

Enable virtually mapped kernel stacks for ARM64. This provides better
stack overflow detection and improved security by mapping kernel stacks
in vmalloc space rather than using direct mapping.

VMAP_STACK helps catch stack overflows early by placing guard pages
around kernel stacks, and also provides better isolation between
kernel stacks and other kernel data structures.

All dependencies are satisfied for arm64: HAVE_ARCH_VMAP_STACK is
already selected above, and KASAN_VMALLOC is selected when KASAN is
enabled, meeting the KASAN dependency requirements.

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 393d71124f5d..179b302f43c2 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -280,6 +280,7 @@ config ARM64
 	select HAVE_SOFTIRQ_ON_OWN_STACK
 	select USER_STACKTRACE_SUPPORT
 	select VDSO_GETRANDOM
+	select VMAP_STACK
 	help
 	  ARM 64-bit (AArch64) Linux support.
 

-- 
2.47.1