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
| ||
|
Message-Id: <20121104.122611.1457246059414191903.davem@davemloft.net> Date: Sun, 04 Nov 2012 12:26:11 -0500 (EST) From: David Miller <davem@...emloft.net> To: sven@...fation.org Cc: b.a.t.m.a.n@...ts.open-mesh.org, ordex@...istici.org, netdev@...r.kernel.org Subject: Re: [B.A.T.M.A.N.] [PATCH 1/9] batman-adv: add UNICAST_4ADDR packet type From: Sven Eckelmann <sven@...fation.org> Date: Sun, 04 Nov 2012 11:29:29 +0100 > Now also assume following really unusual situation: We get our data from a > ethernet driver and the skb stores the ethernet header. The start of the > ethernet header is perfectly aligned (4 or even 16 byte boundary aligned). The > the header is 14/18 byte long (6 byte src, 6 byte dst, 2 byte ethertype and > maybe 4 byte vlan). Now the payload starts only on a 2 byte boundary -> it is > never 4 byte boundary aligned. A 32 bit read now causes different variations > of problems (reminder: bus error). Every ethernet driver must provide the networking stack with a modulo 2 aligned ethernet header, which makes sure that everything after the ethernet header is at least 4 byte aligned. -- 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
Powered by blists - more mailing lists