[2/2] cxl: Fail mmap if requested mapping is larger than assigned problem state area

Michael Ellerman mpe at ellerman.id.au
Wed Jul 8 20:54:09 AEST 2015

On Tue, 2015-07-07 at 05:45:46 UTC, Ian Munsie wrote:
> From: Ian Munsie <imunsie at au1.ibm.com>
> This patch makes the mmap call fail outright if the requested region is
> larger than the problem state area assigned to the context so the error
> is reported immediately rather than waiting for an attempt to access an
> address out of bounds.
> Although we never expect users to map more than the assigned problem
> state area and are not aware of anyone doing this (other than for
> testing), this does have the potential to break users if someone has
> used a larger range regardless. I'm submitting it for consideration, but
> if this change is not considered acceptable the previous patch is
> sufficient to prevent access out of bounds without breaking anyone.
> Signed-off-by: Ian Munsie <imunsie at au1.ibm.com>

Applied to powerpc fixes, thanks.



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