[bug?] Access was denied by memory protection keys in execute-only address
linuxram at us.ibm.com
Sat Mar 24 11:44:40 AEDT 2018
On Fri, Mar 23, 2018 at 05:27:06PM +0800, Li Wang wrote:
> On Thu, Mar 22, 2018 at 3:09 PM, Ram Pai <linuxram at us.ibm.com> wrote:
> On Wed, Mar 21, 2018 at 02:53:00PM +0800, Li Wang wrote:
> > On Wed, Mar 21, 2018 at 5:58 AM, Ram Pai
> <linuxram at us.ibm.com> wrote:
> > that why not disable the pkey_execute_disable_supported on p8
> It turns out to be a testcase bug. On Big endian powerpc ABI, function
> ptrs are basically pointers to function descriptors. The testcase
> copies functions which results in function descriptors getting copied.
> You have to apply the following patch to your test case for it to
> operate as intended. Thanks to Michael Ellermen for helping me out.
> Otherwise I would be scratching my head for ever.
> Thanks for the explanation, I learned something new about this. :)
> And the worth to say, seems the patch only works on powerpc arch,
> others(x86_64, etc)
> that does not works well, so a simple workaround is to isolate the code
> to powerpc system?
yes. this code has to be made applicable to powerpc Big-endian code
only. The powerpc little-endian code remains unchanged.
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