Thread (3 messages) 3 messages, 3 authors, 2019-08-17

Re: [Bug 204371] BUG kmalloc-4k (Tainted: G W ): Object padding overwritten

From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2019-07-31 13:35:57

Possibly related (same subject, not in this thread)

bugzilla-daemon@bugzilla.kernel.org writes:
quoted hunk ↗ jump to hunk
https://bugzilla.kernel.org/show_bug.cgi?id=204371

--- Comment #2 from Andrew Morton (akpm@linux-foundation.org) ---
(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).


On Mon, 29 Jul 2019 22:35:48 +0000 bugzilla-daemon@bugzilla.kernel.org wrote:
quoted
https://bugzilla.kernel.org/show_bug.cgi?id=204371

            Bug ID: 204371
           Summary: BUG kmalloc-4k (Tainted: G        W        ): Object
                    padding overwritten
           Product: Memory Management
           Version: 2.5
    Kernel Version: 5.3.0-rc2
          Hardware: PPC-32
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Slab Allocator
          Assignee: akpm@linux-foundation.org
          Reporter: erhard_f@mailbox.org
        Regression: No
cc'ing various people here.

I suspect proc_cgroup_show() is innocent and that perhaps
bpf_prepare_filter() had a memory scribble.  iirc there has been at
least one recent pretty serious bpf fix applied recently.  Can others
please take a look?
I haven't been able to reproduce this on a 64-bit or 32-bit powerpc
machine here. But I don't run gentoo userspace, so I suspect I'm not
tripping the same path at boot. I did run the seccomp selftest and that
didn't trip it either.

cheers
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