linux-kernel - [PATCH 4.9 215/223] arm64: compat: Provide definition for COMPAT

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Message-Id: <20190802092250.685349111@linuxfoundation.org>
Date:   Fri,  2 Aug 2019 11:37:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Oleg Nesterov <oleg@...hat.com>,
        Dave Martin <Dave.Martin@....com>,
        Steve McIntyre <steve.mcintyre@....com>,
        Steve McIntyre <93sam@...ian.org>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH 4.9 215/223] arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ

From: Will Deacon <will.deacon@....com>

commit 24951465cbd279f60b1fdc2421b3694405bcff42 upstream.

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>
Reviewed-by: Dave Martin <Dave.Martin@....com>
Reported-by: Steve McIntyre <steve.mcintyre@....com>
Tested-by: Steve McIntyre <93sam@...ian.org>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/include/asm/compat.h |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm64/include/asm/compat.h
+++ b/arch/arm64/include/asm/compat.h
@@ -234,6 +234,7 @@ static inline compat_uptr_t ptr_to_compa
 }

 #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)
 {