[1/2] cxl: Fix off by one error allowing subsequent mmap page to be accessed

Michael Ellerman mpe at ellerman.id.au
Wed Jul 8 20:54:07 AEST 2015

On Tue, 2015-07-07 at 05:45:45 UTC, Ian Munsie wrote:
> From: Ian Munsie <imunsie at au1.ibm.com>
> It was discovered that if a process mmaped their problem state area they
> were able to access one page more than expected, potentially allowing
> them to access the problem state area of an unrelated process.
> This was due to a simple off by one error in the mmap fault handler
> introduced in 0712dc7e73e59d79bcead5d5520acf4e9e917e87 ("cxl: Fix issues
> when unmapping contexts"), which is fixed in this patch.
> Cc: stable at vger.kernel.org
> Fixes: 0712dc7e73e5 ("cxl: Fix issues when unmapping contexts")
> Signed-off-by: Ian Munsie <imunsie at au1.ibm.com>

Applied to powerpc fixes, thanks.



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