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Date: Sun, 23 Jun 2024 12:23:45 +0100 From: Mark Brown <broonie@...nel.org> To: "Rick P. Edgecombe" <rick.p.edgecombe@...el.com>, Deepak Gupta <debug@...osinc.com>, Szabolcs Nagy <Szabolcs.Nagy@....com>, "H.J. Lu" <hjl.tools@...il.com>, Florian Weimer <fweimer@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, Daniel Bristot de Oliveira <bristot@...hat.com>, Valentin Schneider <vschneid@...hat.com>, Christian Brauner <brauner@...nel.org>, Shuah Khan <shuah@...nel.org> Cc: linux-kernel@...r.kernel.org, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, jannh@...gle.com, bsegall@...gle.com, linux-kselftest@...r.kernel.org, linux-api@...r.kernel.org, Mark Brown <broonie@...nel.org>, Kees Cook <kees@...nel.org>, David Hildenbrand <david@...hat.com> Subject: [PATCH RFT v6 3/9] 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: David Hildenbrand <david@...hat.com> Acked-by: David Hildenbrand <david@...hat.com> Reviewed-by: Deepak Gupta <debug@...osinc.com> Reviewed-by: Rick Edgecombe <rick.p.edgecombe@...el.com> Signed-off-by: Mark Brown <broonie@...nel.org> --- 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 1d7122a1883e..4a5e40d4c14e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1949,6 +1949,7 @@ 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 f8d35f993fe5..1b56c1077507 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -704,7 +704,7 @@ 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 9849dfda44d4..5ec7bc355657 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -342,7 +342,7 @@ 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 b4cb45255a54..45416916dec1 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1249,6 +1249,12 @@ config IOMMU_MM_DATA config EXECMEM bool +config ARCH_HAS_USER_SHADOW_STACK + bool + help + The architecture has hardware support for userspace shadow call + stacks (eg, x87 CET, arm64 GCS or RISC-V Zicfiss). + source "mm/damon/Kconfig" endmenu -- 2.39.2
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