linux-kernel - Re: [PATCH v2 2/4] libnvdimm/namespace: Enforce memremap_compat

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Date:   Thu, 13 Feb 2020 14:16:00 -0500
From:   Jeff Moyer <jmoyer@...hat.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     linux-nvdimm@...ts.01.org,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        vishal.l.verma@...el.com, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 2/4] libnvdimm/namespace: Enforce memremap_compat_align()

Dan Williams <dan.j.williams@...el.com> writes:

> The pmem driver on PowerPC crashes with the following signature when
> instantiating misaligned namespaces that map their capacity via
> memremap_pages().
>
>     BUG: Unable to handle kernel data access at 0xc001000406000000
>     Faulting instruction address: 0xc000000000090790
>     NIP [c000000000090790] arch_add_memory+0xc0/0x130
>     LR [c000000000090744] arch_add_memory+0x74/0x130
>     Call Trace:
>      arch_add_memory+0x74/0x130 (unreliable)
>      memremap_pages+0x74c/0xa30
>      devm_memremap_pages+0x3c/0xa0
>      pmem_attach_disk+0x188/0x770
>      nvdimm_bus_probe+0xd8/0x470
>
> With the assumption that only memremap_pages() has alignment
> constraints, enforce memremap_compat_align() for
> pmem_should_map_pages(), nd_pfn, or nd_dax cases.
>
> Reported-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> Cc: Jeff Moyer <jmoyer@...hat.com>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> Link: https://lore.kernel.org/r/158041477336.3889308.4581652885008605170.stgit@dwillia2-desk3.amr.corp.intel.com
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

Reviewed-by: Jeff Moyer <jmoyer@...hat.com>