Re: [PATCH v2 2/2] proc: do not allow negative offsets on/proc/<pid>/environ

[Oleg Nesterov]

On 07/24, Djalal Harouni wrote:
>
>  static int mem_open(struct inode *inode, struct file *file)
>  {
> -	return __mem_open(inode, file, PTRACE_MODE_ATTACH);
> +	int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH);
> +
> +	/* OK to pass negative loff_t, we can catch out-of-range */
> +	file->f_mode |= FMODE_UNSIGNED_OFFSET;
> +
> +	return ret;
>  }

It could be even simpler, I meant

	file->f_mode |= FMODE_UNSIGNED_OFFSET;
	return __mem_open(inode, file, PTRACE_MODE_ATTACH);

Never mind, this is very minor and the patch is already in -mm.

Oleg.

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