netdev - [PATCH 06/17] MIPS: bpf: Use 'andi' instead of 'and' for the VLAN cases

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, 23 Jun 2014 10:38:49 +0100
From:	Markos Chandras <markos.chandras@...tec.com>
To:	<linux-mips@...ux-mips.org>
CC:	Markos Chandras <markos.chandras@...tec.com>,
	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	"Alexei Starovoitov" <ast@...mgrid.com>, <netdev@...r.kernel.org>
Subject: [PATCH 06/17] MIPS: bpf: Use 'andi' instead of 'and' for the VLAN cases

The VLAN_VID_MASK and VLAN_TAG_PRESENT are immediates, so using
'and' which expects 3 registers will produce wrong results. Fix
this by using the 'andi' instruction.

Cc: "David S. Miller" <davem@...emloft.net>
Cc: Daniel Borkmann <dborkman@...hat.com>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: netdev@...r.kernel.org
Signed-off-by: Markos Chandras <markos.chandras@...tec.com>
---
 arch/mips/net/bpf_jit.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/mips/net/bpf_jit.c b/arch/mips/net/bpf_jit.c
index 95728ea6cb74..fe5041bdc6fb 100644
--- a/arch/mips/net/bpf_jit.c
+++ b/arch/mips/net/bpf_jit.c
@@ -1317,9 +1317,9 @@ jmp_cmp:
 			off = offsetof(struct sk_buff, vlan_tci);
 			emit_half_load(r_s0, r_skb, off, ctx);
 			if (code == (BPF_ANC | SKF_AD_VLAN_TAG))
-				emit_and(r_A, r_s0, VLAN_VID_MASK, ctx);
+				emit_andi(r_A, r_s0, VLAN_VID_MASK, ctx);
 			else
-				emit_and(r_A, r_s0, VLAN_TAG_PRESENT, ctx);
+				emit_andi(r_A, r_s0, VLAN_TAG_PRESENT, ctx);
 			break;
 		case BPF_ANC | SKF_AD_PKTTYPE:
 			off = pkt_type_offset();
-- 
2.0.0

--
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