Re: mmap 0-th page

[Jiri Slaby <jirislaby@kernel.org>]

On 26. 07. 24, 12:36, michal.hrachovec@volny.cz wrote:
> I am trying to allocate the 0-th page with mmap function in my code.
> I am always getting this error with this error-code: mmap error ffffffff
> Then I was searching the internet for this topic and I have found the 
> same topic at stackoverflow web pages.


         char *zero = mmap(NULL, 4096, PROT_READ | PROT_WRITE, 
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
         *(char *)(NULL) = 'A';
         printf("%c\n", *zero);

still yields 'A' here with 6.10.2 w/ vm.mmap_min_addr=0.

-- 
js
suse labs