Re: [bug #66089] On macos mprotect can't be PROT_WRITE and PROT_EXEC at the same time

[Lorenzo Daneo]

The errno is 1 (Operation not permitted).

Lorenzo

Il giorno mer 14 ago 2024 alle ore 20:33 Bruno Haible <INVALID.NOREPLY@gnu.org> ha scritto:

Follow-up Comment #4, bug #66089 (group libffcall):

Lorenzo Daneo wrote in
https://lists.gnu.org/archive/html/libffcall/2024-08/msg00007.html:
> I just tried to recompile with HAVE_MMAP_SHARED_CAN_EXEC = 1
> and HAVE_MPROTECT_AFTER_MMAP_CAN_EXEC = 0
Yes, that's what one needs to look at.

> *page =
(char*)mmap(NULL,pagesize,PROT_READ|PROT_WRITE,MAP_SHARED,file_fd,file_length);*
> *page_x =
(char*)mmap(NULL,pagesize,PROT_READ|PROT_EXEC,MAP_SHARED,file_fd,file_length);*
>
> The second mmap is not working.

What is the value of errno after the assignment to page_x ?


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