Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [day] [month] [year] [list]
Date: Mon, 1 Feb 2010 16:04:37 -0500 (EST)
From: Josh Bressers <>
Cc: "Steven M. Christey" <>
Subject: Re: CVE request - kernel: DoS on x86_64

----- "Eugene Teo" <> wrote:

> Reported by Mathias Krause. The problem seams to be located in
> fs/binfmt_elf.c:load_elf_binary(). It calls SET_PERSONALITY() prior 
> checking that the ELF interpreter is available. This in turn makes the
> previously 32 bit process a 64 bit one which would be fine if execve()
> would succeed. But after the SET_PERSONALITY() the open_exec() call 
> fails (because it cannot find the interpreter) and execve() almost 
> instantly returns with an error. If you now look at /proc/PID/maps 
> you'll see, that it has the vsyscall page mapped which shouldn't be.
> But 
> the process is not dead yet, it's still running. By now generating a 
> segmentation fault and in turn trying to generate a core dump the
> kernel just dies.
> Steps to Reproduce:
> 1. Enable core dumps
> 2. Start an 32 bit program that tries to execve() an 64 bit program
> 3. The 64 bit program cannot be started by the kernel because it can't
> find the interpreter, i.e. execve returns with an error
> 4. Generate a segmentation fault
> 5. panic
> Upstream commit:
> References:

Please use CVE-2010-0307 for this.



Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.