Messages in this thread | ![/](/images/icornerl.gif) | | From | Dan Williams <> | Date | Tue, 8 Dec 2020 15:40:52 -0800 | Subject | Re: [PATCH V2 2/2] mm/highmem: Lift memcpy_[to|from]_page to core |
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On Tue, Dec 8, 2020 at 2:49 PM Darrick J. Wong <darrick.wong@oracle.com> wrote: [..] > > So what's your preferred poison? > > > > 1. Corrupt random data in whatever's been mapped into the next page (which > > is what the helpers currently do) > > Please no.
My assertion is that the kernel can't know it's corruption, it can only know that the driver is abusing the API. So over-copy and WARN seems better than violently regress by crashing what might have been working silently before.
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