netdev - [PATCH v2 net-next 2/3] x86: bpf_jit_comp: support BPF_S_ANC_SECCOMP_LD

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Date:	Fri, 26 Apr 2013 22:17:26 -0400
From:	Xi Wang <xi.wang@...il.com>
To:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Will Drewry <wad@...omium.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Russell King <linux@....linux.org.uk>,
	David Laight <david.laight@...lab.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nicolas Schichan <nschichan@...ebox.fr>,
	Xi Wang <xi.wang@...il.com>
Subject: [PATCH v2 net-next 2/3] x86: bpf_jit_comp: support BPF_S_ANC_SECCOMP_LD_W instruction

This patch implements the seccomp BPF_S_ANC_SECCOMP_LD_W instruction
in x86 JIT.

Signed-off-by: Xi Wang <xi.wang@...il.com>
Cc: Daniel Borkmann <dborkman@...hat.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Will Drewry <wad@...omium.org>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Russell King <linux@....linux.org.uk>
Cc: David Laight <david.laight@...lab.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Nicolas Schichan <nschichan@...ebox.fr>
---
 arch/x86/net/bpf_jit_comp.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 8898680..5f1dafb 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -683,6 +683,17 @@ cond_branch:			f_offset = addrs[i + filter[i].jf] - addrs[i];
 				}
 				EMIT_COND_JMP(f_op, f_offset);
 				break;
+#ifdef CONFIG_SECCOMP_FILTER
+			case BPF_S_ANC_SECCOMP_LD_W:
+				func = (u8 *)seccomp_bpf_load;
+				t_offset = func - (image + addrs[i]);
+				/* seccomp filters don't use %rdi, %r8, %r9
+				 * it is safe to not save these registers
+				 */
+				EMIT1_off32(0xbf, K); /* mov imm32,%edi */
+				EMIT1_off32(0xe8, t_offset); /* call seccomp_bpf_load */
+				break;
+#endif
 			default:
 				/* hmm, too complex filter, give up with jit compiler */
 				goto out;
-- 
1.8.1.2

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