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[RESEND,2/2] arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ

Message ID 1536158083-30166-3-git-send-email-will.deacon@arm.com
State New
Headers show
Series Don't use SIGMINSTKSZ when enforcing alternative signal stack size for compat tasks | expand

Commit Message

Will Deacon Sept. 5, 2018, 2:34 p.m. UTC 
arch/arm/ defines a SIGMINSTKSZ of 2k, so we should use the same value
for compat tasks.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>

Reported-by: Steve McIntyre <steve.mcintyre@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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

-- 
2.1.4
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Patch

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)
 {