linux-kernel - Re: [PATCH v5 08/23] evm: Align evm_inode_post_setxattr() definition with LSM infrastructure

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Date:   Tue, 7 Nov 2023 09:28:16 -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 08/23] evm: Align evm_inode_post_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_post_setxattr() definition, so that it can be registered
> as implementation of the inode_post_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               | 8 +++++---
>  security/integrity/evm/evm_main.c | 4 +++-
>  security/security.c               | 2 +-
>  3 files changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/evm.h b/include/linux/evm.h
> index 7c6a74dbc093..437d4076a3b3 100644
> --- a/include/linux/evm.h
> +++ b/include/linux/evm.h
> @@ -31,7 +31,8 @@ extern int evm_inode_setxattr(struct mnt_idmap *idmap,
>  extern void evm_inode_post_setxattr(struct dentry *dentry,
>  				    const char *xattr_name,
>  				    const void *xattr_value,
> -				    size_t xattr_value_len);
> +				    size_t xattr_value_len,
> +				    int flags);
>  extern int evm_inode_removexattr(struct mnt_idmap *idmap,
>  				 struct dentry *dentry, const char *xattr_name);
>  extern void evm_inode_post_removexattr(struct dentry *dentry,
> @@ -55,7 +56,7 @@ static inline void evm_inode_post_set_acl(struct dentry *dentry,
>  					  const char *acl_name,
>  					  struct posix_acl *kacl)
>  {
> -	return evm_inode_post_setxattr(dentry, acl_name, NULL, 0);
> +	return evm_inode_post_setxattr(dentry, acl_name, NULL, 0, 0);
>  }
>  
>  int evm_inode_init_security(struct inode *inode, struct inode *dir,
> @@ -114,7 +115,8 @@ static inline int evm_inode_setxattr(struct mnt_idmap *idmap,
>  static inline void evm_inode_post_setxattr(struct dentry *dentry,
>  					   const char *xattr_name,
>  					   const void *xattr_value,
> -					   size_t xattr_value_len)
> +					   size_t xattr_value_len,
> +					   int flags)
>  {
>  	return;
>  }
> diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
> index 7fc083d53fdf..ea84a6f835ff 100644
> --- a/security/integrity/evm/evm_main.c
> +++ b/security/integrity/evm/evm_main.c
> @@ -730,6 +730,7 @@ bool evm_revalidate_status(const char *xattr_name)
>   * @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
>   *
>   * Update the HMAC stored in 'security.evm' to reflect the change.
>   *
> @@ -738,7 +739,8 @@ bool evm_revalidate_status(const char *xattr_name)
>   * i_mutex lock.
>   */
>  void evm_inode_post_setxattr(struct dentry *dentry, const char *xattr_name,
> -			     const void *xattr_value, size_t xattr_value_len)
> +			     const void *xattr_value, size_t xattr_value_len,
> +			     int flags)
>  {
>  	if (!evm_revalidate_status(xattr_name))
>  		return;
> diff --git a/security/security.c b/security/security.c
> index ae3625198c9f..53793f3cb36a 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -2367,7 +2367,7 @@ void security_inode_post_setxattr(struct dentry *dentry, const char *name,
>  	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
>  		return;
>  	call_void_hook(inode_post_setxattr, dentry, name, value, size, flags);
> -	evm_inode_post_setxattr(dentry, name, value, size);
> +	evm_inode_post_setxattr(dentry, name, value, size, flags);
>  }
>  
>  /**