Date: Wed, 26 Aug 2009 08:07:51 +0400 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Cc: "Steven M. Christey" <coley@...us.mitre.org> Subject: Re: CVE request - kernel: information leak in sigaltstack Steve, On Tue, Aug 18, 2009 at 04:54:43PM -0400, Steven M. Christey wrote: > On Tue, 4 Aug 2009, Eugene Teo wrote: > > > do_sigaltstack: avoid copying 'stack_t' as a structure to user space > > > ====================================================== > Name: CVE-2009-2847 [...] > The do_sigaltstack function in kernel/signal.c in Linux kernel 2.6 > before 2.6.31-rc5, when running on 64-bit systems, does not clear > certain padding bytes from a structure, which allows local users to > obtain sensitive information from the kernel stack via the sigaltstack > function. As far as I'm aware, this also affects 2.4 (I did not actively test for it, but the vulnerable code is there). I've included a fix for it in 126.96.36.199-ow1, and I expect that Willy will fix it in his next release (likely 188.8.131.52). Alexander
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