[PATCH v2 4/5] arm64/ptrace: Avoid uninitialised struct padding in fpr_set()

From: Dave Martin <Dave.Martin@arm.com>

This patch adds an explicit __reserved[] field to user_fpsimd_state
to replace what was previously unnamed padding.

This ensures that data in this region are propagated across
assignment rather than being left possibly uninitialised at the
destination.

Cc: <redacted> # 3.7.x-
Fixes: 60ffc30d5652 ("arm64: Exception handling")
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Will Deacon <redacted>
---
 arch/arm64/include/uapi/asm/ptrace.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/uapi/asm/ptrace.h b/arch/arm64/include/uapi/asm/ptrace.h
index b5c3933..d1ff83d 100644
--- a/arch/arm64/include/uapi/asm/ptrace.h
+++ b/arch/arm64/include/uapi/asm/ptrace.h

@@ -77,6 +77,7 @@ struct user_fpsimd_state {
 	__uint128_t	vregs[32];
 	__u32		fpsr;
 	__u32		fpcr;
+	__u32		__reserved[2];
 };
 
 struct user_hwdebug_state {

-- 
2.1.4