linux-kernel - [PATCH 3.10 101/250] arm64/ptrace: Avoid uninitialised struct padding in fpr

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1496876436-32402-102-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:58:07 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Dave Martin <Dave.Martin@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 101/250] arm64/ptrace: Avoid uninitialised struct padding in fpr_set()

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: Willy Tarreau <w@....eu>
---
 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 6913643..c136fd5 100644
--- 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 {
-- 
2.8.0.rc2.1.gbe9624a