linux-kernel - [PATCH 3.16 237/370] arm64/ptrace: Avoid uninitialised struct padding in fpr

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Message-ID: <lsq.1489146383.879404493@decadent.org.uk>
Date:   Fri, 10 Mar 2017 11:46:23 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Dave Martin" <Dave.Martin@....com>,
        "Catalin Marinas" <catalin.marinas@....com>,
        "Will Deacon" <Will.Deacon@....com>
Subject: [PATCH 3.16 237/370] arm64/ptrace: Avoid uninitialised struct
 padding in fpr_set()

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit aeb1f39d814b2e21e5e5706a48834bfd553d0059 upstream.

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.

Fixes: 60ffc30d5652 ("arm64: Exception handling")
Signed-off-by: Dave Martin <Dave.Martin@....com>
Acked-by: Will Deacon <Will.Deacon@....com>
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/arm64/include/uapi/asm/ptrace.h | 1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm64/include/uapi/asm/ptrace.h
+++ b/arch/arm64/include/uapi/asm/ptrace.h
@@ -75,6 +75,7 @@ struct user_fpsimd_state {
 	__uint128_t	vregs[32];
 	__u32		fpsr;
 	__u32		fpcr;
+	__u32		__reserved[2];
 };
 
 struct user_hwdebug_state {