From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Martin Schwidefsky Subject: [PATCH 3.10 17/48] s390/bpf,jit: initialize A register if 1st insn is BPF_S_LDX_B_MSH Date: Sun, 11 May 2014 21:19:51 +0200 Message-Id: <20140511191950.467673563@linuxfoundation.org> In-Reply-To: <20140511191948.079900414@linuxfoundation.org> References: <20140511191948.079900414@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Martin Schwidefsky commit 6e0de817594c61f3b392a9245deeb09609ec707d upstream. The A register needs to be initialized to zero in the prolog if the first instruction of the BPF program is BPF_S_LDX_B_MSH to prevent leaking the content of %r5 to user space. Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- arch/s390/net/bpf_jit_comp.c | 1 - 1 file changed, 1 deletion(-) --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -243,7 +243,6 @@ static void bpf_jit_noleaks(struct bpf_j case BPF_S_LD_W_IND: case BPF_S_LD_H_IND: case BPF_S_LD_B_IND: - case BPF_S_LDX_B_MSH: case BPF_S_LD_IMM: case BPF_S_LD_MEM: case BPF_S_MISC_TXA: