11 Oct
2018
11 Oct
'18
9:30 p.m.
On Fri, Oct 12, 2018 at 12:02:56AM +0300, Cyrill Gorcunov wrote:
On Thu, Oct 11, 2018 at 11:56:01PM +0300, Alexey Dobriyan wrote:
As the comment in the beginning says this test is specifically for addresss 0. Maybe it should be ifdeffed with __arm__ then.
Is there some other reason than allocating non-mergable VMA?
IIRC the reason is to test address 0 as it is effectively banned for userspace so if it will be broken, it will be broken silently for a long time.
As for "unmergeable" libc here doesn't map /dev/zero. I know how to avoid even theoretical breakage by creating binaries by hand but it will be probably too much.