lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20071207163142.4e77f9c3.akpm@linux-foundation.org>
Date:	Fri, 7 Dec 2007 16:31:42 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	npiggin@...e.de
Cc:	mchehab@...radead.org, v4l-dvb-maintainer@...uxtv.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andy Whitcroft <apw@...dowen.org>
Subject: Re: [patch 07/18] v4l: nopage

On Wed, 05 Dec 2007 18:15:54 +1100
npiggin@...e.de wrote:

> +static int
> +videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
>  {
>  	struct page *page;
>  
> -	dprintk(3,"nopage: fault @ %08lx [vma %08lx-%08lx]\n",
> -		vaddr,vma->vm_start,vma->vm_end);
> -	if (vaddr > vma->vm_end)
> -		return NOPAGE_SIGBUS;
> +	dprintk(3,"fault: fault @ %08lx [vma %08lx-%08lx]\n",
> +		(unsigned long)vmf->virtual_address,vma->vm_start,vma->vm_end);
>  	page = alloc_page(GFP_USER | __GFP_DMA32);
>  	if (!page)
> -		return NOPAGE_OOM;
> +		return VM_FAULT_OOM;
>  	clear_user_page(page_address(page), vaddr, page);

This didn't compile on sparc64 because `vaddr' is undefined.


Let us see why:

#define clear_user_page(page, vaddr, pg)	clear_page(page)
#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)

#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
	alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)

root cause: lack of argument checking on x86 due to stupid macros.


Could someone *please* start a little project of extirpating this utter
brain damage?  Convert those macros to typechecked static inlines on x86
(at least) so this sort of thing (which happens again and again and again)
is lessened?


macros are such miserable things.  I wonder if we could get checkpatch to
help out here?  
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ