Re: v5.1-rc1 binder_alloc_do_buffer_copy() BUG_ON triggered by selinux-testsuite

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[...]

> > Is there a public dashboard where I can take a look at those binder failures?
>
> Not really.  I send test results to a not-yet-publicized mailing list,
> but there is more detail in the GitHub issue below (my last comment
> has the verbose test output):
>
> * https://github.com/SELinuxProject/selinux-kernel/issues/46
>

Ok, so it looks like something was introduced that causes binder to be
too permissive (test 3 transaction succeeded when failure is
expected). I don't know of any recent binder changes that could have
caused that.

It will take me a while to set up this test environment. Is this easy
for you to run? Any chance of bisecting or at least trying a few
versions to narrow it down? Here's a list of the recent patchset -- it
would be useful to know which caused it (or if none of them did):

9e98c678c2d6a Linux 5.1-rc1
...
26528be6720bb binder: fix handling of misaligned binder object
bde4a19fc04f5 binder: use userspace pointer as base of buffer space
c41358a5f5217 binder: remove user_buffer_offset
db6b0b810bf94 binder: avoid kernel vm_area for buffer fixups
7a67a39320dfb binder: add function to copy binder object from buffer
8ced0c6231ead binder: add functions to copy to/from binder buffers
1a7c3d9bb7a92 binder: create userspace-to-binder-buffer copy function
...
1c163f4c7b3f6 (tag: v5.0) Linux 5.0

Thanks,

-Todd



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