linux-kernel - Re: [PATCH 02/15] security: move LSM xattrnames to xattr.h

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Date:	Sun, 27 Jun 2010 21:35:34 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: Re: [PATCH 02/15] security: move LSM xattrnames to xattr.h

On Sun, 2010-06-27 at 09:54 -0700, Casey Schaufler wrote:
> Mimi Zohar wrote:
> > On Thu, 2010-06-24 at 20:49 -0700, Casey Schaufler wrote: 
> >   
> >> Mimi Zohar wrote:
> >>     
> >>> Make the security extended attributes names global.
> >>>
> >>> Signed-off-by: Mimi Zohar <zohar@...ibm.com>
> >>> Acked-by: Serge Hallyn <serue@...ibm.com>
> >>> ---
> >>>  include/linux/capability.h |    3 ---
> >>>  include/linux/xattr.h      |   10 ++++++++++
> >>>  security/selinux/hooks.c   |    3 ---
> >>>  security/smack/smack.h     |    2 --
> >>>  4 files changed, 10 insertions(+), 8 deletions(-)
> >>>
> >>> diff --git a/include/linux/capability.h b/include/linux/capability.h
> >>> index 39e5ff5..90012b9 100644
> >>> --- a/include/linux/capability.h
> >>> +++ b/include/linux/capability.h
> >>> @@ -49,9 +49,6 @@ typedef struct __user_cap_data_struct {
> >>>  } __user *cap_user_data_t;
> >>>  
> >>>  
> >>> -#define XATTR_CAPS_SUFFIX "capability"
> >>> -#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
> >>> -
> >>>  #define VFS_CAP_REVISION_MASK	0xFF000000
> >>>  #define VFS_CAP_REVISION_SHIFT	24
> >>>  #define VFS_CAP_FLAGS_MASK	~VFS_CAP_REVISION_MASK
> >>> diff --git a/include/linux/xattr.h b/include/linux/xattr.h
> >>> index 0cfa1e9..62ca853 100644
> >>> --- a/include/linux/xattr.h
> >>> +++ b/include/linux/xattr.h
> >>> @@ -33,6 +33,16 @@
> >>>  #define XATTR_USER_PREFIX "user."
> >>>  #define XATTR_USER_PREFIX_LEN (sizeof (XATTR_USER_PREFIX) - 1)
> >>>  
> >>> +/* Security namespace */
> >>> +#define XATTR_SELINUX_SUFFIX "selinux"
> >>> +#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
> >>> +
> >>> +#define XATTR_SMACK_SUFFIX "SMACK64"
> >>> +#define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
> >>> +
> >>> +#define XATTR_CAPS_SUFFIX "capability"
> >>> +#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
> >>> +
> >>>  struct inode;
> >>>  struct dentry;
> >>>  
> >>> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> >>> index 0f524b7..85338f0 100644
> >>> --- a/security/selinux/hooks.c
> >>> +++ b/security/selinux/hooks.c
> >>> @@ -87,9 +87,6 @@
> >>>  #include "netlabel.h"
> >>>  #include "audit.h"
> >>>  
> >>> -#define XATTR_SELINUX_SUFFIX "selinux"
> >>> -#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
> >>> -
> >>>  #define NUM_SEL_MNT_OPTS 5
> >>>  
> >>>  extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
> >>> diff --git a/security/smack/smack.h b/security/smack/smack.h
> >>> index c6e9aca..9c773e3 100644
> >>> --- a/security/smack/smack.h
> >>> +++ b/security/smack/smack.h
> >>> @@ -126,10 +126,8 @@ struct smack_known {
> >>>  /*
> >>>   * xattr names
> >>>   */
> >>> -#define XATTR_SMACK_SUFFIX	"SMACK64"
> >>>  #define XATTR_SMACK_IPIN	"SMACK64IPIN"
> >>>  #define XATTR_SMACK_IPOUT	"SMACK64IPOUT"
> >>> -#define XATTR_NAME_SMACK	XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
> >>>  #define XATTR_NAME_SMACKIPIN	XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
> >>>  #define XATTR_NAME_SMACKIPOUT	XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
> >>>   
> >>>       
> >> Why just the SMACK64 attribute name, and not the others? They are
> >> manipulated with the same interfaces (well, fsetxattr, fgetxattr)
> >> as the SMACK64 attribute. There isn't any conceptual difference and
> >> the rationale for moving attribute names really ought to apply to
> >> them as well.
> >>     
> >
> > Hi Casey,
> >
> > Moving the other SMACK xattrs is fine, but are they used on persistent
> > files and need to be EVM protected?
> >   
> 
> They are not persistent in any configuration available today, but
> as they say, tomorrow never knows. The real reason I'm concerned is
> that I always dislike having to go look in two places for something
> like attr names. Either global or local is fine, but it should be
> one or the other.

agreed. So I'll update the patch to move the remaining xattrs, without
including them in the HMAC.

Mimi

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