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Date: Wed, 12 Jul 2017 23:33:00 +0100
From: Mark Rutland <mark.rutland@....com>
To: ard.biesheuvel@...aro.org,
kernel-hardening@...ts.openwall.com,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Cc: akashi.takahiro@...aro.org,
catalin.marinas@....com,
dave.martin@....com,
james.morse@....com,
labbott@...oraproject.org,
will.deacon@....com,
keescook@...omium.org,
Mark Rutland <mark.rutland@....com>
Subject: [RFC PATCH 3/6] arm64: pad stacks to PAGE_SIZE for VMAP_STACK
Our THREAD_SIZE may be smaller than PAGE_SIZE. With VMAP_STACK, we can't
allow stacks to share a page with anything else, so may as well pad
up-to PAGE_SIZE, and have 64K stacks when we have 64K pages.
Signed-off-by: Mark Rutland <mark.rutland@....com>
---
arch/arm64/include/asm/thread_info.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 6d0c59a..3684f86 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -25,7 +25,13 @@
#include <asm/page.h>
-#define THREAD_SHIFT 14
+#define __THREAD_SHIFT 14
+
+#if defined(CONFIG_VMAP_STACK) && (__THREAD_SHIFT < PAGE_SHIFT)
+#define THREAD_SHIFT PAGE_SHIFT
+#else
+#define THREAD_SHIFT __THREAD_SHIFT
+#endif
#if THREAD_SHIFT >= PAGE_SHIFT
#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
--
1.9.1
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