----- Original Message -----
> From: "Cyril Hrubis" <chru...@suse.cz>
> To: "Jan Stancek" <jstan...@redhat.com>
> Cc: ltp-list@lists.sourceforge.net
> Sent: Wednesday, 9 September, 2015 2:37:37 PM
> Subject: Re: [LTP] [PATCH] mprotect04: fix powerpc crash when copying
> exec_func
>
> Hi!
> > Testcase tried to copy page size area starting at &exec_func.
> > This results in crash on powerpc, because &exec_func is too close
> > to end of page and subsequent page is not mapped:
>
> I was wondering about this problem when I was fixing the test, but could
> not actually hit it.
>
> > -static void *get_func(void *mem)
> > +static int page_present(void *p)
> > {
> > - memcpy(mem, exec_func, getpagesize());
> > + int fd;
> > +
> > + fd = SAFE_OPEN(cleanup, "page_present", O_WRONLY|O_CREAT, 0644);
>
> Why don't we use "/dev/null"?
It doesn't seem reliable:
open("/dev/null", O_WRONLY|O_CREAT, 0644) = 3
write(3, NULL, 1) = 1
close(3) = 0
I'm seeing this on RHEL6.7 kernel, I haven't tried latest upstream yet.
Regards,
Jan
>
>
> The rest looks good to me.
>
> --
> Cyril Hrubis
> chru...@suse.cz
>
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