netdev - [PATCH net-next 2/8] x86: bpf_jit_comp: add JMP instructions for BPF JIT

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]

Date:	Mon, 31 Dec 2012 14:59:42 +0100
From:	Daniel Borkmann <dborkman@...hat.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 2/8] x86: bpf_jit_comp: add JMP instructions for BPF JIT

This patch is a follow-up for patch "net: bpf: add lt,le jump
operations to bpf machine" that implements BPF x86 JIT parts
for BPF JMP_LT/JMP_LE operations.

Cc: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
---
 arch/x86/net/bpf_jit_comp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index d11a470..6d6a4ce 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -584,10 +584,14 @@ common_load_ind:		seen |= SEEN_DATAREF | SEEN_XREG;
 				break;
 			COND_SEL(BPF_S_JMP_JGT_K, X86_JA, X86_JBE);
 			COND_SEL(BPF_S_JMP_JGE_K, X86_JAE, X86_JB);
+			COND_SEL(BPF_S_JMP_JLT_K, X86_JB, X86_JAE);
+			COND_SEL(BPF_S_JMP_JLE_K, X86_JBE, X86_JA);
 			COND_SEL(BPF_S_JMP_JEQ_K, X86_JE, X86_JNE);
 			COND_SEL(BPF_S_JMP_JSET_K,X86_JNE, X86_JE);
 			COND_SEL(BPF_S_JMP_JGT_X, X86_JA, X86_JBE);
 			COND_SEL(BPF_S_JMP_JGE_X, X86_JAE, X86_JB);
+			COND_SEL(BPF_S_JMP_JLT_X, X86_JB, X86_JAE);
+			COND_SEL(BPF_S_JMP_JLE_X, X86_JBE, X86_JA);
 			COND_SEL(BPF_S_JMP_JEQ_X, X86_JE, X86_JNE);
 			COND_SEL(BPF_S_JMP_JSET_X,X86_JNE, X86_JE);
 
@@ -603,6 +607,8 @@ cond_branch:			f_offset = addrs[i + filter[i].jf] - addrs[i];
 				switch (filter[i].code) {
 				case BPF_S_JMP_JGT_X:
 				case BPF_S_JMP_JGE_X:
+				case BPF_S_JMP_JLT_X:
+				case BPF_S_JMP_JLE_X:
 				case BPF_S_JMP_JEQ_X:
 					seen |= SEEN_XREG;
 					EMIT2(0x39, 0xd8); /* cmp %ebx,%eax */
@@ -618,6 +624,8 @@ cond_branch:			f_offset = addrs[i + filter[i].jf] - addrs[i];
 					}
 				case BPF_S_JMP_JGT_K:
 				case BPF_S_JMP_JGE_K:
+				case BPF_S_JMP_JLT_K:
+				case BPF_S_JMP_JLE_K:
 					if (K <= 127)
 						EMIT3(0x83, 0xf8, K); /* cmp imm8,%eax */
 					else
-- 
1.7.11.7

--
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