linux-kernel - Re: [PATCH] LSM: Add a Smack subdirectory in /proc/.../attr

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Message-ID: <20170118235207.GA17613@avx2>
Date:   Thu, 19 Jan 2017 02:52:07 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Casey Schaufler <casey@...aufler-ca.com>
Cc:     LSM <linux-security-module@...r.kernel.org>,
        LKLM <linux-kernel@...r.kernel.org>,
        James Morris <jmorris@...ei.org>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] LSM: Add a Smack subdirectory in /proc/.../attr

On Wed, Jan 18, 2017 at 11:07:19AM -0800, Casey Schaufler wrote:

> -int security_getprocattr(struct task_struct *p, char *name, char **value)
> +int security_getprocattr(struct task_struct *p, const char *lsm, char *name,
> +				char **value)
>  {
> -	return call_int_hook(getprocattr, -EINVAL, p, name, value);
> +	struct security_hook_list *hp;
> +	int rc = -EINVAL;

This is dead write.

> +	list_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
> +		if (lsm != NULL && strcmp(lsm, hp->lsm))
> +			continue;
> +		rc = hp->hook.getprocattr(p, name, value);
> +		if (rc != -ENOENT)
> +			return rc;
> +	}
> +	return -EINVAL;		<-------+
					|
> -int security_setprocattr(struct task_|struct *p, char *name, void *value, size_t size)
> +int security_setprocattr(struct task_|struct *p, const char *lsm, char *name,
> +				void *va|lue, size_t size)
>  {					|
> -	return call_int_hook(setprocattr|, -EINVAL, p, name, value, size);
> +	struct security_hook_list *hp;	|
> +	int rc = -EINVAL;		|
					|
This one is not.			|
					|
> +					|
> +	list_for_each_entry(hp, &securit|y_hook_heads.setprocattr, list) {
> +		if (lsm != NULL && strcm|p(lsm, hp->lsm))
> +			continue;	|
> +		rc = hp->hook.setprocatt|r(p, name, value, size);
> +		if (rc != -ENOENT)	|
> +			break;		|
> +	}				|
> +	return rc;		<-------+