On Mon, Nov 20, 2023 at 11:54:29PM +0000, Mark Brown wrote: > 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: David Hildenbrand <david@xxxxxxxxxx> > Acked-by: David Hildenbrand <david@xxxxxxxxxx> > Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> > --- > arch/x86/Kconfig | 1 + > fs/proc/task_mmu.c | 2 +- > include/linux/mm.h | 2 +- > mm/Kconfig | 6 ++++++ > 4 files changed, 9 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 3762f41bb092..14b7703a9a2b 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -1952,6 +1952,7 @@ 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 > diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c > index ef2eb12906da..f0a904aeee8e 100644 > --- a/fs/proc/task_mmu.c > +++ b/fs/proc/task_mmu.c > @@ -699,7 +699,7 @@ 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 > }; > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 418d26608ece..10462f354614 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -341,7 +341,7 @@ extern unsigned int kobjsize(const void *objp); > #endif > #endif /* CONFIG_ARCH_HAS_PKEYS */ > > -#ifdef CONFIG_X86_USER_SHADOW_STACK > +#ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK > /* > * VM_SHADOW_STACK should not be set with VM_SHARED because of lack of > * support core mm. > diff --git a/mm/Kconfig b/mm/Kconfig > index 89971a894b60..6713bb3b0b48 100644 > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -1270,6 +1270,12 @@ config LOCK_MM_AND_FIND_VMA > bool > depends on !STACK_GROWSUP > > +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). The whitespace looks suspicious, I think there should be a leading tab. Otherwise Reviewed-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx> > + > source "mm/damon/Kconfig" > > endmenu > > -- > 2.30.2 > -- Sincerely yours, Mike.
