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

["Dennis Lan (dlan)" <dennis.yxun@xxxxxxxxx>]

On Mon, Nov 10, 2014 at 8:09 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Mon, 2014-11-10 at 12:44 +0100, Atom2 wrote:
>
>> > 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.
>> The issue currently is with the guys at gentoo (for links please again
>> see my latest post to the list from Sunday which also seems to confirm
>> that the issue is not confined to 4.3.3 but also 4.4.1).
>
> OK, I'll wait and see what the gentoo folks have to say before looking
> any close then, thanks.
>
Hi Ian
 what we found now is, the Gentoo's hardened toolchain, turn CFLAGS
-fstack-check on by default, with this flag and compile gcc will
result xl segfault (actually with libgcc_s.so)
 we have a patch to force gcc build libgcc(only this part) code with
-fstack-check=no, make the segfault gone
 more info can be found at https://bugs.gentoo.org/show_bug.cgi?id=528690

> Ian.
>
>
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