linux-kernel - Re: [REGRESSION] coredumps truncated after "new helper: dump

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Date:	Fri, 15 Nov 2013 12:57:59 -0800
From:	Joe Perches <joe@...ches.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Peter Wu <lekensteyn@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] coredumps truncated after "new helper:
 dump_align()"

On Fri, 2013-11-15 at 20:38 +0000, Al Viro wrote:
> On Fri, Nov 15, 2013 at 03:26:10PM +0100, Peter Wu wrote:
> > Somewhere in the merge window of 3.13, coredumps appear truncated.
> > Instead of 319488 bytes, I get 868 bytes (tested with x86_64 only).
> > 
> > The latest Linus' master (v3.12-9579-g049ffa8) is still affected.
> > Bisection leads to:
> > 
> > commit 22a8cb8248ba5d340307ba72432253b1dbdb5cf7

trivia:

> diff --git a/fs/coredump.c b/fs/coredump.c
[]
> @@ -733,7 +733,7 @@ int dump_align(struct coredump_params *cprm, int align)
>  {
>  	unsigned mod = cprm->written & (align - 1);
>  	if (align & (align - 1))
> -		return -EINVAL;
> -	return mod ? dump_skip(cprm, align - mod) : 0;
> +		return 0;
> +	return mod ? dump_skip(cprm, align - mod) : 1;
>  }
>  EXPORT_SYMBOL(dump_align);

extern int dump_skip(struct coredump_params *cprm, size_t nr);
extern int dump_emit(struct coredump_params *cprm, const void *addr, int nr);
extern int dump_align(struct coredump_params *cprm, int align);

Perhaps all of these should return bool not int.
Is there a reason these should be EXPORT_SYMBOL?


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