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From: "Mickaël Salaün" <[email protected]>
To: Paul Moore <[email protected]>,
	[email protected], [email protected],
	[email protected], [email protected],
	[email protected],
	Kumar Kartikeya Dwivedi <[email protected]>,
	Jens Axboe <[email protected]>,
	Pavel Begunkov <[email protected]>
Subject: Re: [RFC PATCH v2 5/9] fs: add anon_inode_getfile_secure() similar to anon_inode_getfd_secure()
Date: Thu, 12 Aug 2021 11:32:15 +0200	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <162871492283.63873.8743976556992924333.stgit@olly>


On 11/08/2021 22:48, Paul Moore wrote:
> Extending the secure anonymous inode support to other subsystems
> requires that we have a secure anon_inode_getfile() variant in
> addition to the existing secure anon_inode_getfd() variant.
> 
> Thankfully we can reuse the existing __anon_inode_getfile() function
> and just wrap it with the proper arguments.
> 
> Signed-off-by: Paul Moore <[email protected]>
> 
> ---
> v2:
> - no change
> v1:
> - initial draft
> ---
>  fs/anon_inodes.c            |   29 +++++++++++++++++++++++++++++
>  include/linux/anon_inodes.h |    4 ++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
> index a280156138ed..e0c3e33c4177 100644
> --- a/fs/anon_inodes.c
> +++ b/fs/anon_inodes.c
> @@ -148,6 +148,35 @@ struct file *anon_inode_getfile(const char *name,
>  }
>  EXPORT_SYMBOL_GPL(anon_inode_getfile);
>  
> +/**
> + * anon_inode_getfile_secure - Like anon_inode_getfile(), but creates a new
> + *                             !S_PRIVATE anon inode rather than reuse the
> + *                             singleton anon inode and calls the
> + *                             inode_init_security_anon() LSM hook.  This
> + *                             allows for both the inode to have its own
> + *                             security context and for the LSM to enforce
> + *                             policy on the inode's creation.
> + *
> + * @name:    [in]    name of the "class" of the new file
> + * @fops:    [in]    file operations for the new file
> + * @priv:    [in]    private data for the new file (will be file's private_data)
> + * @flags:   [in]    flags
> + * @context_inode:
> + *           [in]    the logical relationship with the new inode (optional)
> + *
> + * The LSM may use @context_inode in inode_init_security_anon(), but a
> + * reference to it is not held.  Returns the newly created file* or an error
> + * pointer.  See the anon_inode_getfile() documentation for more information.
> + */
> +struct file *anon_inode_getfile_secure(const char *name,
> +				       const struct file_operations *fops,
> +				       void *priv, int flags,
> +				       const struct inode *context_inode)
> +{
> +	return __anon_inode_getfile(name, fops, priv, flags,
> +				    context_inode, true);

This is not directly related to this patch but why using the "secure"
boolean in __anon_inode_getfile() and __anon_inode_getfd() instead of
checking that context_inode is not NULL? This would simplify the code,
remove this anon_inode_getfile_secure() wrapper and avoid potential
inconsistencies.

> +}
> +
>  static int __anon_inode_getfd(const char *name,
>  			      const struct file_operations *fops,
>  			      void *priv, int flags,
> diff --git a/include/linux/anon_inodes.h b/include/linux/anon_inodes.h
> index 71881a2b6f78..5deaddbd7927 100644
> --- a/include/linux/anon_inodes.h
> +++ b/include/linux/anon_inodes.h
> @@ -15,6 +15,10 @@ struct inode;
>  struct file *anon_inode_getfile(const char *name,
>  				const struct file_operations *fops,
>  				void *priv, int flags);
> +struct file *anon_inode_getfile_secure(const char *name,
> +				       const struct file_operations *fops,
> +				       void *priv, int flags,
> +				       const struct inode *context_inode);
>  int anon_inode_getfd(const char *name, const struct file_operations *fops,
>  		     void *priv, int flags);
>  int anon_inode_getfd_secure(const char *name,
> 

  reply	other threads:[~2021-08-12  9:39 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11 20:48 [RFC PATCH v2 0/9] Add LSM access controls and auditing to io_uring Paul Moore
2021-08-11 20:48 ` [RFC PATCH v2 1/9] audit: prepare audit_context for use in calling contexts beyond syscalls Paul Moore
2021-08-11 20:48 ` [RFC PATCH v2 2/9] audit,io_uring,io-wq: add some basic audit support to io_uring Paul Moore
2021-08-11 20:48 ` [RFC PATCH v2 3/9] audit: dev/test patch to force io_uring auditing Paul Moore
2021-08-11 20:48 ` [RFC PATCH v2 4/9] audit: add filtering for io_uring records Paul Moore
2021-08-11 20:48 ` [RFC PATCH v2 5/9] fs: add anon_inode_getfile_secure() similar to anon_inode_getfd_secure() Paul Moore
2021-08-12  9:32   ` Mickaël Salaün [this message]
2021-08-12 14:32     ` Paul Moore
2021-08-12 15:35       ` Mickaël Salaün
2021-08-11 20:48 ` [RFC PATCH v2 6/9] io_uring: convert io_uring to the secure anon inode interface Paul Moore
2021-08-11 20:48 ` [RFC PATCH v2 7/9] lsm,io_uring: add LSM hooks to io_uring Paul Moore
2021-08-11 20:49 ` [RFC PATCH v2 8/9] selinux: add support for the io_uring access controls Paul Moore
2021-08-11 20:49 ` [RFC PATCH v2 9/9] Smack: Brutalist io_uring support with debug Paul Moore
2021-08-31 14:44   ` Paul Moore
2021-08-31 15:03     ` Casey Schaufler
2021-08-31 16:43       ` Paul Moore
2021-08-24 20:57 ` [RFC PATCH v2 0/9] Add LSM access controls and auditing to io_uring Richard Guy Briggs
2021-08-24 22:27   ` Paul Moore
2021-08-25  1:36     ` Richard Guy Briggs
2021-08-26  1:16   ` Richard Guy Briggs
2021-08-26  1:34     ` Paul Moore
2021-08-26 16:32       ` Richard Guy Briggs
2021-08-26 19:14         ` Paul Moore
2021-08-27 13:35           ` Richard Guy Briggs
2021-08-27 19:49             ` Paul Moore
2021-08-28 15:03               ` Richard Guy Briggs
2021-08-29 15:18                 ` Paul Moore
2021-09-01 19:21                   ` Paul Moore
2021-09-10  0:58                     ` Richard Guy Briggs
2021-09-13 19:23                       ` Paul Moore
2021-09-14  1:50                         ` Paul Moore
2021-09-14  2:49                           ` Paul Moore
2021-09-15 12:29                             ` Richard Guy Briggs
2021-09-15 13:02                               ` Steve Grubb
2021-09-15 14:12                               ` Paul Moore

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