Date: Wed, 29 Sep 2010 09:01:15 +0200 From: Marcus Meissner <meissner@...e.de> To: oss-security@...ts.openwall.com Cc: "Steven M. Christey" <coley@...us.mitre.org> Subject: Re: CVE request - kernel: prevent heap corruption in snd_ctl_new() On Wed, Sep 29, 2010 at 02:49:52PM +0800, Eugene Teo wrote: > Reported by Dan Rosenberg. The snd_ctl_new() function in > sound/core/control.c allocates space for a snd_kcontrol struct by > performing arithmetic operations on a user-provided size without > checking for integer overflow. If a user provides a large enough size, > an overflow will occur, the allocated chunk will be too small, and a > second user-influenced value will be written repeatedly past the bounds > of this chunk. This code is reachable by unprivileged users who have > permission to open a /dev/snd/controlC* device (on many distros, this is > group "audio") via the SNDRV_CTL_IOCTL_ELEM_ADD and > SNDRV_CTL_IOCTL_ELEM_REPLACE ioctls. > > Upstream commit: > http://git.kernel.org/linus/5591bf07225523600450edd9e6ad258bb877b779 Doesnt seem to be valid. There is also no change in sounds/core/control.c since April in current mainline git. Ciao, Marcus
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