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Message-Id: <20240801-arm64-gcs-v10-12-699e2bd2190b@kernel.org>
Date: Thu, 01 Aug 2024 13:06:39 +0100
From: Mark Brown <broonie@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
Andrew Morton <akpm@...ux-foundation.org>, Marc Zyngier <maz@...nel.org>,
Oliver Upton <oliver.upton@...ux.dev>, James Morse <james.morse@....com>,
Suzuki K Poulose <suzuki.poulose@....com>, Arnd Bergmann <arnd@...db.de>,
Oleg Nesterov <oleg@...hat.com>, Eric Biederman <ebiederm@...ssion.com>,
Shuah Khan <shuah@...nel.org>,
"Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
Deepak Gupta <debug@...osinc.com>, Ard Biesheuvel <ardb@...nel.org>,
Szabolcs Nagy <Szabolcs.Nagy@....com>, Kees Cook <kees@...nel.org>
Cc: "H.J. Lu" <hjl.tools@...il.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
Florian Weimer <fweimer@...hat.com>, Christian Brauner <brauner@...nel.org>,
Thiago Jung Bauermann <thiago.bauermann@...aro.org>,
Ross Burton <ross.burton@....com>, linux-arm-kernel@...ts.infradead.org,
linux-doc@...r.kernel.org, kvmarm@...ts.linux.dev,
linux-fsdevel@...r.kernel.org, linux-arch@...r.kernel.org,
linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
Mark Brown <broonie@...nel.org>
Subject: [PATCH v10 12/40] mm: Define VM_SHADOW_STACK for arm64 when we
support GCS
Use VM_HIGH_ARCH_5 for guarded control stack pages.
Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@...aro.org>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
Documentation/filesystems/proc.rst | 2 +-
include/linux/mm.h | 12 +++++++++++-
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index e834779d9611..6a882c57a7e7 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -579,7 +579,7 @@ encoded manner. The codes are the following:
mt arm64 MTE allocation tags are enabled
um userfaultfd missing tracking
uw userfaultfd wr-protect tracking
- ss shadow stack page
+ ss shadow/guarded control stack page
sl sealed
== =======================================
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 96faf26b6083..c6c7454ce4e0 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -353,7 +353,17 @@ extern unsigned int kobjsize(const void *objp);
* for more details on the guard size.
*/
# define VM_SHADOW_STACK VM_HIGH_ARCH_5
-#else
+#endif
+
+#if defined(CONFIG_ARM64_GCS)
+/*
+ * arm64's Guarded Control Stack implements similar functionality and
+ * has similar constraints to shadow stacks.
+ */
+# define VM_SHADOW_STACK VM_HIGH_ARCH_5
+#endif
+
+#ifndef VM_SHADOW_STACK
# define VM_SHADOW_STACK VM_NONE
#endif
--
2.39.2
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