linux-kernel - [PATCH 2/2] arm64: compat: Provide definition for COMPAT

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Message-Id: <1532526312-26993-3-git-send-email-will.deacon@arm.com>
Date:   Wed, 25 Jul 2018 14:45:12 +0100
From:   Will Deacon <will.deacon@....com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org, arnd@...db.de,
        linux@...inikbrodowski.net, ebiederm@...ssion.com,
        akpm@...ux-foundation.org, viro@...iv.linux.org.uk,
        oleg@...hat.com, steve.mcintyre@....com, dave.martin@....com,
        Will Deacon <will.deacon@....com>
Subject: [PATCH 2/2] arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ

arch/arm/ defines a SIGMINSTKSZ of 2k, so we should use the same value
for compat tasks.

Cc: Arnd Bergmann <arnd@...db.de>
Cc: Dominik Brodowski <linux@...inikbrodowski.net>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Oleg Nesterov <oleg@...hat.com>
Reported-by: Steve McIntyre <steve.mcintyre@....com>
Signed-off-by: Will Deacon <will.deacon@....com>
---
 arch/arm64/include/asm/compat.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h
index 1a037b94eba1..cee28a05ee98 100644
--- a/arch/arm64/include/asm/compat.h
+++ b/arch/arm64/include/asm/compat.h
@@ -159,6 +159,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 }
 
 #define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current)))
+#define COMPAT_MINSIGSTKSZ	2048
 
 static inline void __user *arch_compat_alloc_user_space(long len)
 {
-- 
2.1.4