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Re: Fix hppa/ia64/microblaze executable stack default (bug 22156)
On 2017-09-22, at 12:08 PM, Joseph Myers wrote:
> On Fri, 22 Sep 2017, John David Anglin wrote:
>
>> On 2017-09-19, at 10:42 AM, Jeff Law wrote:
>>
>>> I don't think the PA was ever converted to the new bits from the Adacore
>>> guys -- meaning I think it still generates executable stack trampolines
>>> for nested functions.
>>
>> Yes.
>
> We now have two different contradictory assertions about hppa, here and
> <https://gcc.gnu.org/ml/gcc-patches/2017-09/msg01449.html>.
>
> Can someone with hppa-linux hardware confirm what stack permissions the
> kernel in fact starts processes with in the absence of GNU-stack markers
> (Andreas's analysis indicates non-executable), what if any changes glibc
> makes to those permissions after process creation, and whether trampolines
> work in such a process? Testing whether my glibc patch changes the
> answers to any of those questions would be a bonus.
This is what I see for /bin/bash when we reach main:
f8d01000-f8d23000 rwxp 00000000 00:00 0 [stack]
This what I see for ld.so at _start:
f8d01000-f8d23000 rwxp 00000000 00:00 0 [stack]
Don't see any GNU-stack markers in either.
I'll try to test patch this weekend.
Dave
--
John David Anglin dave.anglin@bell.net