Messages in this thread Patch in this message |  | | | Date | Fri, 22 Oct 2010 11:35:28 -0700 | | From | Greg KH <> | | Subject | [61/66] setup_arg_pages: diagnose excessive argument size |
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2.6.32-stable review patch. If anyone has any objections, please let us know.
------------------ From: Roland McGrath <roland@redhat.com>
commit 1b528181b2ffa14721fb28ad1bd539fe1732c583 upstream.
The CONFIG_STACK_GROWSDOWN variant of setup_arg_pages() does not check the size of the argument/environment area on the stack. When it is unworkably large, shift_arg_pages() hits its BUG_ON. This is exploitable with a very large RLIMIT_STACK limit, to create a crash pretty easily.
Check that the initial stack is not too large to make it possible to map in any executable. We're not checking that the actual executable (or intepreter, for binfmt_elf) will fit. So those mappings might clobber part of the initial stack mapping. But that is just userland lossage that userland made happen, not a kernel problem.
Signed-off-by: Roland McGrath <roland@redhat.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Chuck Ebbert <cebbert@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- fs/exec.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/fs/exec.c +++ b/fs/exec.c @@ -594,6 +594,11 @@ int setup_arg_pages(struct linux_binprm #else stack_top = arch_align_stack(stack_top); stack_top = PAGE_ALIGN(stack_top); + + if (unlikely(stack_top < mmap_min_addr) || + unlikely(vma->vm_end - vma->vm_start >= stack_top - mmap_min_addr)) + return -ENOMEM; + stack_shift = vma->vm_end - stack_top; bprm->p -= stack_shift;
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