linux-kernel - Re: [PATCH v2 11/25] security: Align inode

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Message-Id: <CVAFV92MONCH.257Y9YQ3OEU4B@suppilovahvero>
Date:   Tue, 05 Sep 2023 00:08:43 +0300
From:   "Jarkko Sakkinen" <jarkko@...nel.org>
To:     "Roberto Sassu" <roberto.sassu@...weicloud.com>,
        <viro@...iv.linux.org.uk>, <brauner@...nel.org>,
        <chuck.lever@...cle.com>, <jlayton@...nel.org>, <neilb@...e.de>,
        <kolga@...app.com>, <Dai.Ngo@...cle.com>, <tom@...pey.com>,
        <zohar@...ux.ibm.com>, <dmitry.kasatkin@...il.com>,
        <paul@...l-moore.com>, <jmorris@...ei.org>, <serge@...lyn.com>,
        <dhowells@...hat.com>, <stephen.smalley.work@...il.com>,
        <eparis@...isplace.org>, <casey@...aufler-ca.com>
Cc:     <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-nfs@...r.kernel.org>, <linux-integrity@...r.kernel.org>,
        <linux-security-module@...r.kernel.org>,
        <keyrings@...r.kernel.org>, <selinux@...r.kernel.org>,
        "Roberto Sassu" <roberto.sassu@...wei.com>,
        "Stefan Berger" <stefanb@...ux.ibm.com>
Subject: Re: [PATCH v2 11/25] security: Align inode_setattr hook definition
 with EVM

On Thu Aug 31, 2023 at 1:41 PM EEST, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>
>
> Add the idmap parameter to the definition, so that evm_inode_setattr() can
> be registered as this hook implementation.
>
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>
> Acked-by: Casey Schaufler <casey@...aufler-ca.com>
> ---
>  include/linux/lsm_hook_defs.h | 3 ++-
>  security/security.c           | 2 +-
>  security/selinux/hooks.c      | 3 ++-
>  security/smack/smack_lsm.c    | 4 +++-
>  4 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
> index 4bdddb52a8fe..fdf075a6b1bb 100644
> --- a/include/linux/lsm_hook_defs.h
> +++ b/include/linux/lsm_hook_defs.h
> @@ -134,7 +134,8 @@ LSM_HOOK(int, 0, inode_readlink, struct dentry *dentry)
>  LSM_HOOK(int, 0, inode_follow_link, struct dentry *dentry, struct inode *inode,
>  	 bool rcu)
>  LSM_HOOK(int, 0, inode_permission, struct inode *inode, int mask)
> -LSM_HOOK(int, 0, inode_setattr, struct dentry *dentry, struct iattr *attr)
> +LSM_HOOK(int, 0, inode_setattr, struct mnt_idmap *idmap, struct dentry *dentry,
> +	 struct iattr *attr)

LSM_HOOK(int, 0, inode_setattr, struct mnt_idmap *idmap, struct dentry *dentry, struct iattr *attr)

Only 99 characters, i.e. breaking into two lines is not necessary.

>  LSM_HOOK(int, 0, inode_getattr, const struct path *path)
>  LSM_HOOK(int, 0, inode_setxattr, struct mnt_idmap *idmap,
>  	 struct dentry *dentry, const char *name, const void *value,
> diff --git a/security/security.c b/security/security.c
> index cb6242feb968..2b24d01cf181 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -2117,7 +2117,7 @@ int security_inode_setattr(struct mnt_idmap *idmap,
>  
>  	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
>  		return 0;
> -	ret = call_int_hook(inode_setattr, 0, dentry, attr);
> +	ret = call_int_hook(inode_setattr, 0, idmap, dentry, attr);
>  	if (ret)
>  		return ret;
>  	return evm_inode_setattr(idmap, dentry, attr);
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index ee7c49c2cfd3..bfcc4d9aa5ab 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -3075,7 +3075,8 @@ static int selinux_inode_permission(struct inode *inode, int mask)
>  	return rc;
>  }
>  
> -static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
> +static int selinux_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
> +				 struct iattr *iattr)
>  {
>  	const struct cred *cred = current_cred();
>  	struct inode *inode = d_backing_inode(dentry);
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index 679156601a10..89f2669d50a9 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -1181,12 +1181,14 @@ static int smack_inode_permission(struct inode *inode, int mask)
>  
>  /**
>   * smack_inode_setattr - Smack check for setting attributes
> + * @idmap: idmap of the mount
>   * @dentry: the object
>   * @iattr: for the force flag
>   *
>   * Returns 0 if access is permitted, an error code otherwise
>   */
> -static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
> +static int smack_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
> +			       struct iattr *iattr)

static int smack_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry, struct iattr *iattr)

Can be still in a single line (100 characters exactly).


>  {
>  	struct smk_audit_info ad;
>  	int rc;
> -- 
> 2.34.1


BR, Jarkko