Commit bcc9d04e authored by Mark Brown's avatar Mark Brown Committed by Catalin Marinas
Browse files

mm: Introduce ARCH_HAS_USER_SHADOW_STACK 



Since multiple architectures have support for shadow stacks and we need to
select support for this feature in several places in the generic code
provide a generic config option that the architectures can select.

Suggested-by: default avatarDavid Hildenbrand <david@redhat.com>
Acked-by: default avatarDavid Hildenbrand <david@redhat.com>
Reviewed-by: default avatarDeepak Gupta <debug@rivosinc.com>
Reviewed-by: default avatarRick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: default avatarMike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Reviewed-by: default avatarKees Cook <kees@kernel.org>
Tested-by: default avatarKees Cook <kees@kernel.org>
Acked-by: default avatarShuah Khan <skhan@linuxfoundation.org>
Reviewed-by: default avatarThiago Jung Bauermann <thiago.bauermann@linaro.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241001-arm64-gcs-v13-1-222b78d87eee@kernel.org


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 9852d85e

arch/x86/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -1954,6 +1954,7 @@ config X86_USER_SHADOW_STACK 
	depends on AS_WRUSS

	depends on X86_64

	select ARCH_USES_HIGH_VMA_FLAGS

	select ARCH_HAS_USER_SHADOW_STACK

	select X86_CET

	help

	  Shadow stack protection is a hardware feature that detects function

fs/proc/task_mmu.c

+1 −1
Original line number Diff line number Diff line
@@ -971,7 +971,7 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) 
#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR

		[ilog2(VM_UFFD_MINOR)]	= "ui",

#endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */

#ifdef CONFIG_X86_USER_SHADOW_STACK

#ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK

		[ilog2(VM_SHADOW_STACK)] = "ss",

#endif

#if defined(CONFIG_64BIT) || defined(CONFIG_PPC32)

mm/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -1296,6 +1296,12 @@ config NUMA_EMU 
	  into virtual nodes when booted with "numa=fake=N", where N is the

	  number of nodes. This is only useful for debugging.



config ARCH_HAS_USER_SHADOW_STACK

	bool

	help

	  The architecture has hardware support for userspace shadow call

          stacks (eg, x86 CET, arm64 GCS or RISC-V Zicfiss).



source "mm/damon/Kconfig"



endmenu