Commit abc69bb6 authored by Stephen Smalley's avatar Stephen Smalley Committed by James Morris
Browse files

SELinux: enable processes with mac_admin to get the raw inode contexts 



Enable processes with CAP_MAC_ADMIN + mac_admin permission in policy
to get undefined contexts on inodes.  This extends the support for
deferred mapping of security contexts in order to permit restorecon
and similar programs to see the raw file contexts unknown to the
system policy in order to check them.

Signed-off-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent 006ebb40

security/selinux/hooks.c

+23 −4
Original line number Original line Diff line number Diff line
@@ -2754,9 +2754,7 @@ static int selinux_inode_removexattr(struct dentry *dentry, const char *name) 
}

}





/*

/*

 * Copy the in-core inode security context value to the user.  If the

 * Copy the inode security context value to the user.

 * getxattr() prior to this succeeded, check to see if we need to

 * canonicalize the value to be finally returned to the user.

 *

 *

 * Permission check is handled by selinux_inode_getxattr hook.

 * Permission check is handled by selinux_inode_getxattr hook.

 */

 */
@@ -2765,11 +2763,32 @@ static int selinux_inode_getsecurity(const struct inode *inode, const char *name 
	u32 size;

	u32 size;

	int error;

	int error;

	char *context = NULL;

	char *context = NULL;

	struct task_security_struct *tsec = current->security;

	struct inode_security_struct *isec = inode->i_security;

	struct inode_security_struct *isec = inode->i_security;





	if (strcmp(name, XATTR_SELINUX_SUFFIX))

	if (strcmp(name, XATTR_SELINUX_SUFFIX))

		return -EOPNOTSUPP;

		return -EOPNOTSUPP;





	/*

	 * If the caller has CAP_MAC_ADMIN, then get the raw context

	 * value even if it is not defined by current policy; otherwise,

	 * use the in-core value under current policy.

	 * Use the non-auditing forms of the permission checks since

	 * getxattr may be called by unprivileged processes commonly

	 * and lack of permission just means that we fall back to the

	 * in-core context value, not a denial.

	 */

	error = secondary_ops->capable(current, CAP_MAC_ADMIN);

	if (!error)

		error = avc_has_perm_noaudit(tsec->sid, tsec->sid,

					     SECCLASS_CAPABILITY2,

					     CAPABILITY2__MAC_ADMIN,

					     0,

					     NULL);

	if (!error)

		error = security_sid_to_context_force(isec->sid, &context,

						      &size);

	else

		error = security_sid_to_context(isec->sid, &context, &size);

		error = security_sid_to_context(isec->sid, &context, &size);

	if (error)

	if (error)

		return error;

		return error;

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