netdev - Re: ICMP packets - ll_temac with Microblaze

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]

Message-ID: <1324483543.2301.19.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Wed, 21 Dec 2011 17:05:43 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jun Zhao <mypopydev@...il.com>
Cc:	monstr@...str.eu, David Miller <davem@...emloft.net>,
	John Williams <john.williams@...alogix.com>,
	netdev@...r.kernel.org
Subject: Re: ICMP packets - ll_temac with Microblaze

Le jeudi 22 décembre 2011 à 00:01 +0800, Jun Zhao a écrit :

> Why receive buffer size MUST bigger than the jumbo frames size even if
> the packet size is small?

Thats the way it is in linux.

We count the memory size used by the packet.

If not, a malicious attacker could send 1-byte frames and exhaust your
kernel memory.

If you want to reduce it, you might use copybreak : Some drivers copy
the data into a small skb instead of providing a jumbo frame to upper
stack.

tg3 for example.

--
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