linux-kernel - Re: [TOMOYO #15 6/8] LSM adapter functions.

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Date:	Thu, 5 Feb 2009 20:10:55 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Kentaro Takeda <takedakn@...data.co.jp>
Cc:	jmorris@...ei.org, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	haradats@...data.co.jp,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Subject: Re: [TOMOYO #15 6/8] LSM adapter functions.

On Thu, Feb 05, 2009 at 05:18:16PM +0900, Kentaro Takeda wrote:
> +/**
> + * tomoyo_sysctl_path - return the realpath of a ctl_table.
> + * @table: pointer to "struct ctl_table".
> + *
> + * Returns realpath(3) of the @table on success.
> + * Returns NULL on failure.
> + *
> + * This function uses tomoyo_alloc(), so the caller must call tomoyo_free()
> + * if this function didn't return NULL.
> + */
> +static char *tomoyo_sysctl_path(struct ctl_table *table)
> +{
> +	int buflen = TOMOYO_MAX_PATHNAME_LEN;
> +	char *buf = tomoyo_alloc(buflen);
> +	char *end = buf + buflen;
> +	int error = -ENOMEM;
> +
> +	if (!buf)
> +		return NULL;
> +
> +	*--end = '\0';
> +	buflen--;
> +	while (table) {
> +		char buf[32];
> +		const char *sp = table->procname;
> +
> +		if (!sp) {
> +			memset(buf, 0, sizeof(buf));
> +			snprintf(buf, sizeof(buf) - 1, "=%d=", table->ctl_name);
> +			sp = buf;
> +		}
> +		if (tomoyo_prepend(&end, &buflen, sp) ||
> +		    tomoyo_prepend(&end, &buflen, "/"))
> +			goto out;
> +		table = table->parent;
> +	}
> +	if (tomoyo_prepend(&end, &buflen, "/proc/sys"))

Hardcoded path?

> +		goto out;
> +	error = tomoyo_encode(buf, end - buf, end);
> + out:
> +	if (!error)
> +		return buf;
> +	tomoyo_free(buf);
> +	return NULL;
> +}
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