lkml.org 
[lkml]   [2018]   [Jun]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] dh key: fix rounding up KDF output length
Date
Eric Biggers <ebiggers3@gmail.com> wrote:

> Commit 383203eff718 ("dh key: get rid of stack allocated array") changed
> kdf_ctr() to assume that the length of key material to derive is a
> multiple of the digest size. The length was supposed to be rounded up
> accordingly. However, the round_up() macro was used which only gives
> the correct result on power-of-2 arguments, whereas not all hash
> algorithms have power-of-2 digest sizes. In some cases this resulted in
> a write past the end of the 'outbuf' buffer.
>
> Fix it by switching to roundup(), which works for non-power-of-2 inputs.

Applied.

\
 
 \ /
  Last update: 2018-06-08 17:39    [W:0.077 / U:0.252 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site