linux-kernel - [PATCH 3/4] ARM: net: add JIT support for loads from struct seccomp

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Date:	Wed, 29 Apr 2015 15:37:36 +0200
From:	Nicolas Schichan <nschichan@...ebox.fr>
To:	Russell King <linux@....linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	Nicolas Schichan <nschichan@...ebox.fr>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] ARM: net: add JIT support for loads from struct seccomp_data.

Signed-off-by: Nicolas Schichan <nschichan@...ebox.fr>
---
 arch/arm/net/bpf_jit_32.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
index e1268f9..b5f470d 100644
--- a/arch/arm/net/bpf_jit_32.c
+++ b/arch/arm/net/bpf_jit_32.c
@@ -852,6 +852,16 @@ b_epilogue:
 			off = offsetof(struct sk_buff, queue_mapping);
 			emit(ARM_LDRH_I(r_A, r_skb, off), ctx);
 			break;
+		case BPF_LDX | BPF_W | BPF_ABS:
+			/*
+			 * load a 32bit word from struct seccomp_data.
+			 * seccomp_check_filter() will already have checked
+			 * that k is 32bit aligned and lies within the
+			 * struct seccomp_data.
+			 */
+			ctx->seen |= SEEN_SKB;
+			emit(ARM_LDR_I(r_A, r_skb, k), ctx);
+			break;
 		default:
 			return -1;
 		}
-- 
1.9.1

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