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Commit bd35db8b authored by John Johansen's avatar John Johansen
Browse files

apparmor: internal paths should be treated as disconnected 



Internal mounts are not mounted anywhere and as such should be treated
as disconnected paths.

Signed-off-by: default avatarJohn Johansen <john.johansen@canonical.com>
Acked-by: default avatarSeth Arnold <seth.arnold@canonical.com>
parent f2e561d1

security/apparmor/path.c

+36 −28
Original line number Diff line number Diff line
@@ -25,7 +25,6 @@ 
#include "include/path.h"

#include "include/policy.h"





/* modified from dcache.c */

static int prepend(char **buffer, int buflen, const char *str, int namelen)

{
@@ -39,6 +38,38 @@ static int prepend(char **buffer, int buflen, const char *str, int namelen) 


#define CHROOT_NSCONNECT (PATH_CHROOT_REL | PATH_CHROOT_NSCONNECT)



/* If the path is not connected to the expected root,

 * check if it is a sysctl and handle specially else remove any

 * leading / that __d_path may have returned.

 * Unless

 *     specifically directed to connect the path,

 * OR

 *     if in a chroot and doing chroot relative paths and the path

 *     resolves to the namespace root (would be connected outside

 *     of chroot) and specifically directed to connect paths to

 *     namespace root.

 */

static int disconnect(const struct path *path, char *buf, char **name,

		      int flags)

{

	int error = 0;



	if (!(flags & PATH_CONNECT_PATH) &&

	    !(((flags & CHROOT_NSCONNECT) == CHROOT_NSCONNECT) &&

	      our_mnt(path->mnt))) {

		/* disconnected path, don't return pathname starting

		 * with '/'

		 */

		error = -EACCES;

		if (**name == '/')

			*name = *name + 1;

	} else if (**name != '/')

		/* CONNECT_PATH with missing root */

		error = prepend(name, *name - buf, "/", 1);



	return error;

}



/**

 * d_namespace_path - lookup a name associated with a given path

 * @path: path to lookup  (NOT NULL)
@@ -74,7 +105,8 @@ static int d_namespace_path(const struct path *path, char *buf, int buflen, 
			 * control instead of hard coded /proc

			 */

			return prepend(name, *name - buf, "/proc", 5);

		}

		} else

			return disconnect(path, buf, name, flags);

		return 0;

	}
@@ -120,32 +152,8 @@ static int d_namespace_path(const struct path *path, char *buf, int buflen, 
			goto out;

	}



	/* If the path is not connected to the expected root,

	 * check if it is a sysctl and handle specially else remove any

	 * leading / that __d_path may have returned.

	 * Unless

	 *     specifically directed to connect the path,

	 * OR

	 *     if in a chroot and doing chroot relative paths and the path

	 *     resolves to the namespace root (would be connected outside

	 *     of chroot) and specifically directed to connect paths to

	 *     namespace root.

	 */

	if (!connected) {

		if (!(flags & PATH_CONNECT_PATH) &&

			   !(((flags & CHROOT_NSCONNECT) == CHROOT_NSCONNECT) &&

			     our_mnt(path->mnt))) {

			/* disconnected path, don't return pathname starting

			 * with '/'

			 */

			error = -EACCES;

			if (*res == '/')

				*name = res + 1;

		} else if (*res != '/')

			/* CONNECT_PATH with missing root */

			error = prepend(name, *name - buf, "/", 1);



	}

	if (!connected)

		error = disconnect(path, buf, name, flags);



out:

	return error;