[RFC PATCH v2 0/2] Randomization of address chosen by mmap.

Theodore Y. Ts'o tytso at mit.edu
Wed Mar 28 09:16:35 AEDT 2018

On Tue, Mar 27, 2018 at 04:51:08PM +0300, Ilya Smith wrote:
> > /dev/[u]random is not sufficient?
> Using /dev/[u]random makes 3 syscalls - open, read, close. This is a performance
> issue.

You may want to take a look at the getrandom(2) system call, which is
the recommended way getting secure random numbers from the kernel.

> > Well, I am pretty sure userspace can implement proper free ranges
> > tracking…
> I think we need to know what libc developers will say on implementing ASLR in 
> user-mode. I am pretty sure they will say ‘nether’ or ‘some-day’. And problem 
> of ASLR will stay forever.

Why can't you send patches to the libc developers?


						- Ted

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