On 08/29/14 03:32, Marcin Mirosław wrote:
W dniu 29.08.2014 o 01:13, Alex Xu pisze:
On 28/08/14 05:02 PM, Sven Vermeulen wrote:
On Wed, Aug 27, 2014 at 05:34:20PM +0100, André Aparício wrote:
I encountered the same problem with qemu/kvm but can't even login, I
get random segfaults and even failed malloc assertions
in /sbin/init, /sbin/rc or /bin/login (never past this).
But it works fine with CONFIG_PAX_MEMORY_UDEREF disabled.
I am not able to reproduce this :-(
Host and guest are both on 3.15.5-hardened-r2 and both have UDEREF enabled.
I tried emerging boost on the guest as recommended in another post but this
didn't fail.
Wkr,
Sven Vermeulen
My VM has 12 CPUs but I use MAKEOPTS=-j3. Maybe this affects
reproducibility.
My host is of unknown kernel, but I'm pretty sure it's not Gentoo, let
alone Hardened.
Also, I am using <cpu mode="host-passthrough"/> in libvirt (equivalent
to -cpu host in qemu opts), so PAX detects PCID and enables strong
UDEREF. I will try with pax_weakuderef as soon as I get a chance to
reboot the VM.
Fabulous "me too", I've got <cpu mode='host-model'> and guest have PCID
available:
dmesg |grep PCID
[ 0.020000] PAX: PCID detected
[ 0.020000] PAX: PCID detected
[ 0.020000] PAX: PCID detected
Snip from cpuinfo of guest:
processor : 2
vendor_id : GenuineIntel
cpu family : 6
model : 42
model name : Intel Xeon E312xx (Sandy Bridge)
stepping : 1
microcode : 0x1
cpu MHz : 3292.514
cache size : 4096 KB
physical id : 2
siblings : 1
core id : 0
cpu cores : 1
apicid : 2
initial apicid : 2
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx rdtscp lm
constant_tsc arch_perfmon rep_good nopl eagerfpu pni pclmulqdq ssse3
cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx
f16c rdrand hypervisor lahf_lm xsaveopt fsgsbase smep erms
bogomips : 6585.02
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
We should be doing this in a bug report. I'll cc-pipacs.
--
Anthony G. Basile, Ph. D.
Chair of Information Technology
D'Youville College
Buffalo, NY 14201
(716) 829-8197
