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