netdev - Re: [RFC] tcp md5 use of alloc

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:	Wed, 22 Oct 2014 17:53:24 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	cdleonard@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC] tcp md5 use of alloc_percpu

From: Crestez Dan Leonard <cdleonard@...il.com>
Date: Wed, 22 Oct 2014 21:55:46 +0300

>  static int tcp_v4_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
>  					__be32 daddr, __be32 saddr, int nbytes)
>  {
> -	struct tcp4_pseudohdr *bp;
> +	struct tcp4_pseudohdr bp;
...
> +	sg_init_one(&sg, &bp, sizeof(bp));
> +	return crypto_hash_update(&hp->md5_desc, &sg, sizeof(bp));

As others have mentioned, you cannot do this.

On some architectures the kernel stack comes from vmalloc()
memory too.
--
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