linux-kernel - Re: [PATCH v5 07/23] evm: Align evm_inode_setxattr() definition with LSM infrastructure

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Message-ID: <d8094860-f0a3-48f1-a38c-3829d501a6bc@schaufler-ca.com>
Date:   Tue, 7 Nov 2023 09:27:05 -0800
From:   Casey Schaufler <casey@...aufler-ca.com>
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,
        paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com,
        zohar@...ux.ibm.com, dmitry.kasatkin@...il.com,
        dhowells@...hat.com, jarkko@...nel.org,
        stephen.smalley.work@...il.com, eparis@...isplace.org,
        mic@...ikod.net
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        selinux@...r.kernel.org, Roberto Sassu <roberto.sassu@...wei.com>,
        Stefan Berger <stefanb@...ux.ibm.com>,
        Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH v5 07/23] evm: Align evm_inode_setxattr() definition with
 LSM infrastructure

On 11/7/2023 5:39 AM, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>
>
> Change evm_inode_setxattr() definition, so that it can be registered as
> implementation of the inode_setxattr hook.
>
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>
> Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>

Reviewed-by: Casey Schaufler <casey@...aufler-ca.com>


> ---
>  include/linux/evm.h               | 4 ++--
>  security/integrity/evm/evm_main.c | 3 ++-
>  security/security.c               | 2 +-
>  3 files changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/evm.h b/include/linux/evm.h
> index cf976d8dbd7a..7c6a74dbc093 100644
> --- a/include/linux/evm.h
> +++ b/include/linux/evm.h
> @@ -27,7 +27,7 @@ extern void evm_inode_post_setattr(struct mnt_idmap *idmap,
>  				   struct dentry *dentry, int ia_valid);
>  extern int evm_inode_setxattr(struct mnt_idmap *idmap,
>  			      struct dentry *dentry, const char *name,
> -			      const void *value, size_t size);
> +			      const void *value, size_t size, int flags);
>  extern void evm_inode_post_setxattr(struct dentry *dentry,
>  				    const char *xattr_name,
>  				    const void *xattr_value,
> @@ -106,7 +106,7 @@ static inline void evm_inode_post_setattr(struct mnt_idmap *idmap,
>  
>  static inline int evm_inode_setxattr(struct mnt_idmap *idmap,
>  				     struct dentry *dentry, const char *name,
> -				     const void *value, size_t size)
> +				     const void *value, size_t size, int flags)
>  {
>  	return 0;
>  }
> diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
> index d452d469c503..7fc083d53fdf 100644
> --- a/security/integrity/evm/evm_main.c
> +++ b/security/integrity/evm/evm_main.c
> @@ -558,6 +558,7 @@ static int evm_protect_xattr(struct mnt_idmap *idmap,
>   * @xattr_name: pointer to the affected extended attribute name
>   * @xattr_value: pointer to the new extended attribute value
>   * @xattr_value_len: pointer to the new extended attribute value length
> + * @flags: flags to pass into filesystem operations
>   *
>   * Before allowing the 'security.evm' protected xattr to be updated,
>   * verify the existing value is valid.  As only the kernel should have
> @@ -567,7 +568,7 @@ static int evm_protect_xattr(struct mnt_idmap *idmap,
>   */
>  int evm_inode_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
>  		       const char *xattr_name, const void *xattr_value,
> -		       size_t xattr_value_len)
> +		       size_t xattr_value_len, int flags)
>  {
>  	const struct evm_ima_xattr_data *xattr_data = xattr_value;
>  
> diff --git a/security/security.c b/security/security.c
> index 358ec01a5492..ae3625198c9f 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -2272,7 +2272,7 @@ int security_inode_setxattr(struct mnt_idmap *idmap,
>  	ret = ima_inode_setxattr(idmap, dentry, name, value, size, flags);
>  	if (ret)
>  		return ret;
> -	return evm_inode_setxattr(idmap, dentry, name, value, size);
> +	return evm_inode_setxattr(idmap, dentry, name, value, size, flags);
>  }
>  
>  /**