[PATCH v4 00/23] LSM: Module stacking for AppArmor

[James Morris]

On Thu, 27 Jun 2019, James Morris wrote:

> On Wed, 26 Jun 2019, Casey Schaufler wrote:
> 
> > This patchset provides the changes required for
> > the AppArmor security module to stack safely with any other.
> 
> I get a kernel oops with this patchset when running the SELinux testsuite 
> (binder test) with:
> 
> $ cat /sys/kernel/security/lsm 
> capability,yama,loadpin,safesetid,selinux,tomoyo
> 
> 
> [  485.357377] binder: 4224 RLIMIT_NICE not set
> [  485.360727] binder: 4224 RLIMIT_NICE not set
> [  485.361480] binder: 4224 RLIMIT_NICE not set
> [  485.362164] BUG: unable to handle kernel paging request at 0000000000001080
> [  485.362927] #PF error: [normal kernel read fault]
> [  485.363143] ------------[ cut here ]------------
> [  485.363581] PGD 800000044e17b067 P4D 800000044e17b067 PUD 44b796067 PMD 0 
> [  485.364226] kernel BUG at drivers/android/binder_alloc.c:1139!

It's this BUG_ON:

static void binder_alloc_do_buffer_copy(struct binder_alloc *alloc,
                                        bool to_buffer,
                                        struct binder_buffer *buffer,
                                        binder_size_t buffer_offset,
                                        void *ptr,
                                        size_t bytes)
{
        /* All copies must be 32-bit aligned and 32-bit size */
        BUG_ON(!check_buffer(alloc, buffer, buffer_offset, bytes));


-- 
James Morris
<jmorris at namei.org>