netdev - [PATCH net-next 4/5] bpf, x86: detect/optimize loading 0 immediates

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 for Android: free password hash cracker in your pocket

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

Message-Id: <9f39c6c743309353ca414aa7925b74d6230a12e4.1450391511.git.daniel@iogearbox.net>
Date:	Thu, 17 Dec 2015 23:51:56 +0100
From:	Daniel Borkmann <daniel@...earbox.net>
To:	davem@...emloft.net
Cc:	ast@...nel.org, holzheu@...ux.vnet.ibm.com, zlim.lnx@...il.com,
	netdev@...r.kernel.org, Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH net-next 4/5] bpf, x86: detect/optimize loading 0 immediates

When sometimes structs or variables need to be initialized/'memset' to 0 in
an eBPF C program, the x86 BPF JIT converts this to use immediates. We can
however save a couple of bytes (f.e. even up to 7 bytes on a single emmission
of BPF_LD | BPF_IMM | BPF_DW) in the image by detecting such case and use xor
on the dst register instead.

Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Acked-by: Alexei Starovoitov <ast@...nel.org>
---
 arch/x86/net/bpf_jit_comp.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index c080e81..4286f36 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -459,6 +459,18 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
 			}
 
 		case BPF_ALU | BPF_MOV | BPF_K:
+			/* optimization: if imm32 is zero, use 'xor <dst>,<dst>'
+			 * to save 3 bytes.
+			 */
+			if (imm32 == 0) {
+				if (is_ereg(dst_reg))
+					EMIT1(add_2mod(0x40, dst_reg, dst_reg));
+				b2 = 0x31; /* xor */
+				b3 = 0xC0;
+				EMIT2(b2, add_2reg(b3, dst_reg, dst_reg));
+				break;
+			}
+
 			/* mov %eax, imm32 */
 			if (is_ereg(dst_reg))
 				EMIT1(add_1mod(0x40, dst_reg));
@@ -473,6 +485,20 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
 				return -EINVAL;
 			}
 
+			/* optimization: if imm64 is zero, use 'xor <dst>,<dst>'
+			 * to save 7 bytes.
+			 */
+			if (insn[0].imm == 0 && insn[1].imm == 0) {
+				b1 = add_2mod(0x48, dst_reg, dst_reg);
+				b2 = 0x31; /* xor */
+				b3 = 0xC0;
+				EMIT3(b1, b2, add_2reg(b3, dst_reg, dst_reg));
+
+				insn++;
+				i++;
+				break;
+			}
+
 			/* movabsq %rax, imm64 */
 			EMIT2(add_1mod(0x48, dst_reg), add_1reg(0xB8, dst_reg));
 			EMIT(insn[0].imm, 4);
-- 
1.9.3

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html