Re: [Xen-devel] [BUG] XEN 4.3.3 - segfault in xl create for HVM with PCI passthrough

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-11-06 at 16:11 +0100, Atom2 wrote:

> It's probably also worth mentioning that gcc is (and also was with the 
> older gcc-4.7.3) the hardened gcc version of gentoo which forces 
> position-independent executables (PIE), stack smashing protection (SPP) 
> and compile time buffer checks (see 
> http://wiki.gentoo.org/wiki/Hardened_Gentoo). The rest of hardend (PAX, 
> grSecurity, SELinux is not (and never was) in use (so far). I don't know 
> whether any of this might have contributed to the problems I am 
> currently being faced with.

Is it at all possible to recompile at least the Xen toolstack bits with
these extra gcc features disabled? Either by using the old compiler or
somehow (CFLAGS?) disabling those features of the new one.

I'm afraid it's looking more and more like a toolchain issue. I'm not
expert on this side on things but it looks to me like you are hitting an
issue with some sort of buffer overflow check gone wrong? I think you'll
need a gcc hardening person for this one.

Ian.


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