netdev - Re: [PATCH v3 1/2] sysctl: treewide: drop unused argument ctl_table_root::set

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Message-ID: <20240322124532.6ouo5cgwrp3zb3fv@joelS2.panther.com>
Date: Fri, 22 Mar 2024 13:45:32 +0100
From: Joel Granados <j.granados@...sung.com>
To: Thomas Weißschuh <linux@...ssschuh.net>
CC: Luis Chamberlain <mcgrof@...nel.org>, Kees Cook <keescook@...omium.org>,
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	<netdev@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] sysctl: treewide: drop unused argument
 ctl_table_root::set_ownership(table)

On Fri, Mar 15, 2024 at 07:11:30PM +0100, Thomas Weißschuh wrote:
> The argument is never used and can be removed.
> 
> In a future commit the sysctl core will only use
> "const struct ctl_table". Removing it here is a preparation for this
> consitifcation.
> 
> The patch was created with the following coccinelle script:
> 
>   @@
>   identifier func, head, table, uid, gid;
>   @@
> 
>   void func(
>     struct ctl_table_header *head,
>   - struct ctl_table *table,
>     kuid_t *uid, kgid_t *gid)
>   { ... }
> 
> The single changed location was validate through manual inspection and
> compilation.
Will drop this from the commit message when I add it to constfy branch.
For the same reasons as before.

here is the commit message that I'll use
"""
sysctl: treewide: drop unused argument ctl_table_root::set_ownership(table)

Remove the 'table' argument from set_ownership as it is never used. This
change is a step towards putting "struct ctl_table" into .rodata and
eventually having sysctl core only use "const struct ctl_table".

The patch was created with the following coccinelle script:

  @@
  identifier func, head, table, uid, gid;
  @@

  void func(
    struct ctl_table_header *head,
  - struct ctl_table *table,
    kuid_t *uid, kgid_t *gid)
  { ... }

No additional occurrences of 'set_ownership' were found after doing a
tree-wide search.

"""

Reviewed-by: Joel Granados <j.granados@...sung.com>

thx.
> 
> In addition, a search for 'set_ownership' was done over the full tree to
> look for places that were missed by coccinelle.
> None were found.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
>  fs/proc/proc_sysctl.c  | 2 +-
>  include/linux/sysctl.h | 1 -
>  ipc/ipc_sysctl.c       | 3 +--
>  ipc/mq_sysctl.c        | 3 +--
>  net/sysctl_net.c       | 1 -
>  5 files changed, 3 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
> index 37cde0efee57..ed3a41ed9705 100644
> --- a/fs/proc/proc_sysctl.c
> +++ b/fs/proc/proc_sysctl.c
> @@ -480,7 +480,7 @@ static struct inode *proc_sys_make_inode(struct super_block *sb,
>  	}
>  
>  	if (root->set_ownership)
> -		root->set_ownership(head, table, &inode->i_uid, &inode->i_gid);
> +		root->set_ownership(head, &inode->i_uid, &inode->i_gid);
>  	else {
>  		inode->i_uid = GLOBAL_ROOT_UID;
>  		inode->i_gid = GLOBAL_ROOT_GID;
> diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
> index ee7d33b89e9e..60333a6b9370 100644
> --- a/include/linux/sysctl.h
> +++ b/include/linux/sysctl.h
> @@ -205,7 +205,6 @@ struct ctl_table_root {
>  	struct ctl_table_set default_set;
>  	struct ctl_table_set *(*lookup)(struct ctl_table_root *root);
>  	void (*set_ownership)(struct ctl_table_header *head,
> -			      struct ctl_table *table,
>  			      kuid_t *uid, kgid_t *gid);
>  	int (*permissions)(struct ctl_table_header *head, struct ctl_table *table);
>  };
> diff --git a/ipc/ipc_sysctl.c b/ipc/ipc_sysctl.c
> index 45cb1dabce29..1a5085e5b178 100644
> --- a/ipc/ipc_sysctl.c
> +++ b/ipc/ipc_sysctl.c
> @@ -192,7 +192,6 @@ static int set_is_seen(struct ctl_table_set *set)
>  }
>  
>  static void ipc_set_ownership(struct ctl_table_header *head,
> -			      struct ctl_table *table,
>  			      kuid_t *uid, kgid_t *gid)
>  {
>  	struct ipc_namespace *ns =
> @@ -224,7 +223,7 @@ static int ipc_permissions(struct ctl_table_header *head, struct ctl_table *tabl
>  		kuid_t ns_root_uid;
>  		kgid_t ns_root_gid;
>  
> -		ipc_set_ownership(head, table, &ns_root_uid, &ns_root_gid);
> +		ipc_set_ownership(head, &ns_root_uid, &ns_root_gid);
>  
>  		if (uid_eq(current_euid(), ns_root_uid))
>  			mode >>= 6;
> diff --git a/ipc/mq_sysctl.c b/ipc/mq_sysctl.c
> index 21fba3a6edaf..6bb1c5397c69 100644
> --- a/ipc/mq_sysctl.c
> +++ b/ipc/mq_sysctl.c
> @@ -78,7 +78,6 @@ static int set_is_seen(struct ctl_table_set *set)
>  }
>  
>  static void mq_set_ownership(struct ctl_table_header *head,
> -			     struct ctl_table *table,
>  			     kuid_t *uid, kgid_t *gid)
>  {
>  	struct ipc_namespace *ns =
> @@ -97,7 +96,7 @@ static int mq_permissions(struct ctl_table_header *head, struct ctl_table *table
>  	kuid_t ns_root_uid;
>  	kgid_t ns_root_gid;
>  
> -	mq_set_ownership(head, table, &ns_root_uid, &ns_root_gid);
> +	mq_set_ownership(head, &ns_root_uid, &ns_root_gid);
>  
>  	if (uid_eq(current_euid(), ns_root_uid))
>  		mode >>= 6;
> diff --git a/net/sysctl_net.c b/net/sysctl_net.c
> index 051ed5f6fc93..a0a7a79991f9 100644
> --- a/net/sysctl_net.c
> +++ b/net/sysctl_net.c
> @@ -54,7 +54,6 @@ static int net_ctl_permissions(struct ctl_table_header *head,
>  }
>  
>  static void net_ctl_set_ownership(struct ctl_table_header *head,
> -				  struct ctl_table *table,
>  				  kuid_t *uid, kgid_t *gid)
>  {
>  	struct net *net = container_of(head->set, struct net, sysctls);
> 
> -- 
> 2.44.0
> 

-- 

Joel Granados

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