Bugtraq mailing list archives
Re: Linux kernel ELF core dump privilege elevation
From: Greg KH <gregkh () suse de>
Date: Wed, 11 May 2005 11:12:11 -0700
On Wed, May 11, 2005 at 01:08:56PM +0200, Paul Starzetz wrote:
Hi, since it became clear from the discussion in January about the uselib() vulnerability, that the Linux community prefers full, non-embargoed disclosure of kernel bugs, I release full details right now. However to follows at least some of the responsable disclosure rules, no exploit code will be released. Instead, only a proof-of-concept code is released to demonstrate the vulnerability.
<snip> And here's a patch for 2.6 that is completly untested. I'll work on testing it today and if it works, we will release a new 2.6.11.y release with this fix in it. thanks, greg k-h Subject: possibly fix Linux kernel ELF core dump privilege elevation As noted by Paul Starzetz references CAN-something-I-need-to-go-look-up... Signed-off-by: Greg Kroah-Hartman <gregkh () suse de> --- fs/binfmt_elf.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) --- gregkh-2.6.orig/fs/binfmt_elf.c 2005-05-11 00:03:45.000000000 -0700 +++ gregkh-2.6/fs/binfmt_elf.c 2005-05-11 00:09:17.000000000 -0700 @@ -251,7 +251,7 @@ } /* Populate argv and envp */ - p = current->mm->arg_start; + p = current->mm->arg_end = current->mm->arg_start; while (argc-- > 0) { size_t len; __put_user((elf_addr_t)p, argv++); @@ -1301,7 +1301,7 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, struct mm_struct *mm) { - int i, len; + unsigned int i, len; /* first copy the parameters from user space */ memset(psinfo, 0, sizeof(struct elf_prpsinfo));
Current thread:
- Linux kernel ELF core dump privilege elevation Paul Starzetz (May 11)
- Re: Linux kernel ELF core dump privilege elevation Bruno Lustosa (May 11)
- Re: Linux kernel ELF core dump privilege elevation codeQ (May 13)
- Re: Linux kernel ELF core dump privilege elevation Greg KH (May 11)
- Re: Linux kernel ELF core dump privilege elevation Greg KH (May 11)
- Re: Linux kernel ELF core dump privilege elevation Paul Starzetz (May 11)
- Re: Linux kernel ELF core dump privilege elevation (kernel module workaround) Andrew Griffiths (May 12)
- Re: Linux kernel ELF core dump privilege elevation antoine (May 12)
- Re: Linux kernel ELF core dump privilege elevation Pedro Venda (May 13)
- Re: Linux kernel ELF core dump privilege elevation Bruno Lustosa (May 11)