Re: [PATCH] prctl: fix validation of an address

From: Andrey Wagin
Date: Tue Jan 01 2013 - 03:33:28 EST

> The kernel makes the decision on what is valid via security_mmap_addr().
> Assuming there are no security fears of an untrusted application
> tricking some priviledged application to set up these maps the answer is
> just calling security_mmap_addr() instead of doing if(addr <
> mmap_min_addr) return -EINVAL;
> I don't know if it is a good idea to allow this interface to ever go
> below mmap_min_addr, but I do know that using (or even thinking about)
> dac_mmap_min_addr is wrong and you should be looking at
> security_mmap_addr() if you look at anything...

This sounds reasonable. Thank you for the comments. I'm going to send
a second version of this patch.

> -Eric
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