linux-kernel - Re: Spectre mitigation doesn't seem to work at all?!

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Message-ID: <e6c80163-0d73-1bf8-9c3f-1184a73040f6@01019freenet.de>
Date:   Mon, 4 Jun 2018 09:43:35 +0200
From:   Andreas Hartmann <andihartmann@...19freenet.de>
To:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Spectre mitigation doesn't seem to work at all?!

Hello!

Sorry for a ping - but I think the behavior shown below should really be
investigated!


Thanks,
Andreas




On 06/01/2018 at 02:19 PM Andreas Hartmann wrote:
> Hello!
> 
> I tested the spectre mitigation of different machines and kernels with
> https://github.com/crozone/SpectrePoC
> 
> You can see the results below.
> 
> 
> My question: Did I miss something?
> My expectation was, that on base of the output of
> /sys/devices/system/cpu/vulnerabilities/spectre_v* as shown below the
> problem should be gone away.
> But the results seem to tell me something other ... .
> 
> 
> Thanks
> Andreas
> 
> 
> 
> 
> ----------------------------------------------------------------------------------------------------------------------
> 
> CPU:    AMD Ryzen 7 1700X Eight-Core Processor
> Bios:   BIOS 4011 04/19/2018 - ibpb is listed in /proc/cpuinfo
> Kernel: 4.14.44-1.1-default
> cat /sys/devices/system/cpu/vulnerabilities/spectre_v2
> Mitigation: Full AMD retpoline, IBPB
> cat /sys/devices/system/cpu/vulnerabilities/spectre_v1
> Mitigation: __user pointer sanitization
> 
>  ./spectre.out
> Using a cache hit threshold of 80.
> Build: RDTSCP_SUPPORTED MFENCE_SUPPORTED CLFLUSH_SUPPORTED
> INTEL_MITIGATION_DISABLED LINUX_KERNEL_MITIGATION_DISABLED
> Reading 40 bytes:
> Reading at malicious_x = 0xffffffffffdfec18... Success: 0x54=’T’ score=2
> Reading at malicious_x = 0xffffffffffdfec19... Success: 0x68=’h’ score=2
> Reading at malicious_x = 0xffffffffffdfec1a... Success: 0x65=’e’ score=2
> Reading at malicious_x = 0xffffffffffdfec1b... Success: 0x20=’ ’ score=2
> Reading at malicious_x = 0xffffffffffdfec1c... Success: 0x4D=’M’ score=2
> Reading at malicious_x = 0xffffffffffdfec1d... Success: 0x61=’a’ score=2
> Reading at malicious_x = 0xffffffffffdfec1e... Success: 0x67=’g’ score=2
> Reading at malicious_x = 0xffffffffffdfec1f... Success: 0x69=’i’ score=2
> Reading at malicious_x = 0xffffffffffdfec20... Success: 0x63=’c’ score=2
> Reading at malicious_x = 0xffffffffffdfec21... Success: 0x20=’ ’ score=2
> Reading at malicious_x = 0xffffffffffdfec22... Success: 0x57=’W’ score=2
> Reading at malicious_x = 0xffffffffffdfec23... Success: 0x6F=’o’ score=2
> Reading at malicious_x = 0xffffffffffdfec24... Success: 0x72=’r’ score=2
> Reading at malicious_x = 0xffffffffffdfec25... Success: 0x64=’d’ score=2
> Reading at malicious_x = 0xffffffffffdfec26... Success: 0x73=’s’ score=2
> Reading at malicious_x = 0xffffffffffdfec27... Success: 0x20=’ ’ score=2
> Reading at malicious_x = 0xffffffffffdfec28... Success: 0x61=’a’ score=2
> Reading at malicious_x = 0xffffffffffdfec29... Success: 0x72=’r’ score=2
> Reading at malicious_x = 0xffffffffffdfec2a... Success: 0x65=’e’ score=2
> Reading at malicious_x = 0xffffffffffdfec2b... Success: 0x20=’ ’ score=2
> Reading at malicious_x = 0xffffffffffdfec2c... Success: 0x53=’S’ score=2
> Reading at malicious_x = 0xffffffffffdfec2d... Success: 0x71=’q’ score=2
> Reading at malicious_x = 0xffffffffffdfec2e... Success: 0x75=’u’ score=2
> Reading at malicious_x = 0xffffffffffdfec2f... Success: 0x65=’e’ score=2
> Reading at malicious_x = 0xffffffffffdfec30... Success: 0x61=’a’ score=2
> Reading at malicious_x = 0xffffffffffdfec31... Success: 0x6D=’m’ score=2
> Reading at malicious_x = 0xffffffffffdfec32... Success: 0x69=’i’ score=2
> Reading at malicious_x = 0xffffffffffdfec33... Success: 0x73=’s’ score=2
> Reading at malicious_x = 0xffffffffffdfec34... Success: 0x68=’h’ score=2
> Reading at malicious_x = 0xffffffffffdfec35... Success: 0x20=’ ’ score=2
> Reading at malicious_x = 0xffffffffffdfec36... Success: 0x4F=’O’ score=2
> Reading at malicious_x = 0xffffffffffdfec37... Success: 0x73=’s’ score=2
> Reading at malicious_x = 0xffffffffffdfec38... Success: 0x73=’s’ score=2
> Reading at malicious_x = 0xffffffffffdfec39... Success: 0x69=’i’ score=2
> Reading at malicious_x = 0xffffffffffdfec3a... Success: 0x66=’f’ score=2
> Reading at malicious_x = 0xffffffffffdfec3b... Success: 0x72=’r’ score=2
> Reading at malicious_x = 0xffffffffffdfec3c... Success: 0x61=’a’ score=2
> Reading at malicious_x = 0xffffffffffdfec3d... Success: 0x67=’g’ score=2
> Reading at malicious_x = 0xffffffffffdfec3e... Success: 0x65=’e’ score=2
> Reading at malicious_x = 0xffffffffffdfec3f... Success: 0x2E=’.’ score=2
> 
> 
> ----------------------------------------------------------------------------------------------------------------------
> 
> CPU:    AMD G-T40E Processor
> Kernel: 4.14.44-1.el6.x86_64
> cat /sys/devices/system/cpu/vulnerabilities/spectre_v1
> Mitigation: __user pointer sanitization
> cat /sys/devices/system/cpu/vulnerabilities/spectre_v2
> Mitigation: Full AMD retpoline
> 
> ./spectre.out 130
> Using a cache hit threshold of 130.
> Build: RDTSCP_SUPPORTED MFENCE_SUPPORTED CLFLUSH_SUPPORTED
> INTEL_MITIGATION_DISABLED LINUX_KERNEL_MITIGATION_DISABLED
> Reading 40 bytes:
> Reading at malicious_x = 0xffffffffffdfebf0... Unclear: 0x54=’T’
> score=999 (second best: 0x00=’?’ score=992)
> Reading at malicious_x = 0xffffffffffdfebf1... Unclear: 0x68=’h’
> score=996 (second best: 0x00=’?’ score=988)
> Reading at malicious_x = 0xffffffffffdfebf2... Unclear: 0x65=’e’
> score=999 (second best: 0x00=’?’ score=985)
> Reading at malicious_x = 0xffffffffffdfebf3... Unclear: 0x20=’ ’
> score=997 (second best: 0x00=’?’ score=989)
> Reading at malicious_x = 0xffffffffffdfebf4... Unclear: 0x4D=’M’
> score=999 (second best: 0x00=’?’ score=993)
> Reading at malicious_x = 0xffffffffffdfebf5... Unclear: 0x61=’a’
> score=998 (second best: 0x00=’?’ score=991)
> Reading at malicious_x = 0xffffffffffdfebf6... Unclear: 0x67=’g’
> score=996 (second best: 0x00=’?’ score=988)
> Reading at malicious_x = 0xffffffffffdfebf7... Unclear: 0x69=’i’
> score=998 (second best: 0x00=’?’ score=987)
> Reading at malicious_x = 0xffffffffffdfebf8... Unclear: 0x63=’c’
> score=999 (second best: 0x00=’?’ score=989)
> Reading at malicious_x = 0xffffffffffdfebf9... Unclear: 0x20=’ ’
> score=999 (second best: 0x00=’?’ score=989)
> Reading at malicious_x = 0xffffffffffdfebfa... Unclear: 0x57=’W’
> score=998 (second best: 0x5B=’[’ score=985)
> Reading at malicious_x = 0xffffffffffdfebfb... Unclear: 0x6F=’o’
> score=998 (second best: 0x00=’?’ score=988)
> Reading at malicious_x = 0xffffffffffdfebfc... Unclear: 0x00=’?’
> score=985 (second best: 0xF7=’?’ score=942)
> Reading at malicious_x = 0xffffffffffdfebfd... Unclear: 0x64=’d’
> score=999 (second best: 0x00=’?’ score=990)
> Reading at malicious_x = 0xffffffffffdfebfe... Unclear: 0x73=’s’
> score=998 (second best: 0x00=’?’ score=984)
> Reading at malicious_x = 0xffffffffffdfebff... Unclear: 0x20=’ ’
> score=998 (second best: 0x00=’?’ score=985)
> Reading at malicious_x = 0xffffffffffdfec00... Unclear: 0x61=’a’
> score=999 (second best: 0x00=’?’ score=984)
> Reading at malicious_x = 0xffffffffffdfec01... Unclear: 0x72=’r’
> score=999 (second best: 0x00=’?’ score=986)
> Reading at malicious_x = 0xffffffffffdfec02... Unclear: 0x65=’e’
> score=998 (second best: 0x00=’?’ score=980)
> Reading at malicious_x = 0xffffffffffdfec03... Unclear: 0x20=’ ’
> score=998 (second best: 0x00=’?’ score=992)
> Reading at malicious_x = 0xffffffffffdfec04... Unclear: 0x53=’S’
> score=997 (second best: 0x50=’P’ score=990)
> Reading at malicious_x = 0xffffffffffdfec05... Unclear: 0x71=’q’
> score=998 (second best: 0x00=’?’ score=984)
> Reading at malicious_x = 0xffffffffffdfec06... Unclear: 0x75=’u’
> score=999 (second best: 0x72=’r’ score=976)
> Reading at malicious_x = 0xffffffffffdfec07... Unclear: 0x65=’e’
> score=999 (second best: 0x00=’?’ score=988)
> Reading at malicious_x = 0xffffffffffdfec08... Unclear: 0x61=’a’
> score=999 (second best: 0x00=’?’ score=986)
> Reading at malicious_x = 0xffffffffffdfec09... Unclear: 0x6D=’m’
> score=999 (second best: 0x00=’?’ score=987)
> Reading at malicious_x = 0xffffffffffdfec0a... Unclear: 0x69=’i’
> score=998 (second best: 0x00=’?’ score=987)
> Reading at malicious_x = 0xffffffffffdfec0b... Unclear: 0x73=’s’
> score=984 (second best: 0x00=’?’ score=974)
> Reading at malicious_x = 0xffffffffffdfec0c... Unclear: 0x00=’?’
> score=991 (second best: 0xB4=’?’ score=933)
> Reading at malicious_x = 0xffffffffffdfec0d... Unclear: 0x20=’ ’
> score=999 (second best: 0x00=’?’ score=986)
> Reading at malicious_x = 0xffffffffffdfec0e... Unclear: 0x4F=’O’
> score=998 (second best: 0x50=’P’ score=991)
> Reading at malicious_x = 0xffffffffffdfec0f... Unclear: 0x73=’s’
> score=999 (second best: 0x00=’?’ score=987)
> Reading at malicious_x = 0xffffffffffdfec10... Unclear: 0x73=’s’
> score=998 (second best: 0x00=’?’ score=971)
> Reading at malicious_x = 0xffffffffffdfec11... Unclear: 0x69=’i’
> score=999 (second best: 0x00=’?’ score=980)
> Reading at malicious_x = 0xffffffffffdfec12... Unclear: 0x66=’f’
> score=998 (second best: 0x00=’?’ score=978)
> Reading at malicious_x = 0xffffffffffdfec13... Unclear: 0x72=’r’
> score=995 (second best: 0x00=’?’ score=981)
> Reading at malicious_x = 0xffffffffffdfec14... Unclear: 0x61=’a’
> score=996 (second best: 0x00=’?’ score=971)
> Reading at malicious_x = 0xffffffffffdfec15... Unclear: 0x67=’g’
> score=999 (second best: 0x00=’?’ score=975)
> Reading at malicious_x = 0xffffffffffdfec16... Unclear: 0x65=’e’
> score=999 (second best: 0x00=’?’ score=984)
> Reading at malicious_x = 0xffffffffffdfec17... Unclear: 0x2E=’.’
> score=999 (second best: 0x00=’?’ score=987)
> 
> 
> 
> ---------------------------------------------------------------------------------------------------------------------
> 
> CPU:    Intel(R) Core(TM) i5 CPU       M 460  @ 2.53GHz
> Kernel: 4.16.5-13.1-default
> cat /sys/devices/system/cpu/vulnerabilities/spectre_v2
> Mitigation: Full generic retpoline
> cat /sys/devices/system/cpu/vulnerabilities/spectre_v1
> Mitigation: __user pointer sanitization
> 
>  ./spectre.out
> Using a cache hit threshold of 80.
> Build: RDTSCP_SUPPORTED MFENCE_SUPPORTED CLFLUSH_SUPPORTED
> INTEL_MITIGATION_DISABLED LINUX_KERNEL_MITIGATION_DISABLED
> Reading 40 bytes:
> Reading at malicious_x = 0xffffffffffdfebe8... Success: 0x54=’T’ score=2
> Reading at malicious_x = 0xffffffffffdfebe9... Success: 0x68=’h’ score=2
> Reading at malicious_x = 0xffffffffffdfebea... Success: 0x65=’e’ score=2
> Reading at malicious_x = 0xffffffffffdfebeb... Success: 0x20=’ ’ score=7
> (second best: 0x21=’!’ score=1)
> Reading at malicious_x = 0xffffffffffdfebec... Success: 0x4D=’M’ score=2
> Reading at malicious_x = 0xffffffffffdfebed... Success: 0x61=’a’ score=2
> Reading at malicious_x = 0xffffffffffdfebee... Success: 0x67=’g’ score=2
> Reading at malicious_x = 0xffffffffffdfebef... Success: 0x69=’i’ score=7
> (second best: 0xB2=’?’ score=1)
> Reading at malicious_x = 0xffffffffffdfebf0... Success: 0x63=’c’ score=2
> Reading at malicious_x = 0xffffffffffdfebf1... Success: 0x20=’ ’ score=2
> Reading at malicious_x = 0xffffffffffdfebf2... Success: 0x57=’W’ score=2
> Reading at malicious_x = 0xffffffffffdfebf3... Success: 0x6F=’o’ score=2
> Reading at malicious_x = 0xffffffffffdfebf4... Success: 0x72=’r’ score=2
> Reading at malicious_x = 0xffffffffffdfebf5... Success: 0x64=’d’ score=2
> Reading at malicious_x = 0xffffffffffdfebf6... Success: 0x73=’s’ score=2
> Reading at malicious_x = 0xffffffffffdfebf7... Success: 0x20=’ ’ score=2
> Reading at malicious_x = 0xffffffffffdfebf8... Success: 0x61=’a’ score=2
> Reading at malicious_x = 0xffffffffffdfebf9... Success: 0x72=’r’ score=7
> (second best: 0x22=’"’ score=1)
> Reading at malicious_x = 0xffffffffffdfebfa... Success: 0x65=’e’ score=2
> Reading at malicious_x = 0xffffffffffdfebfb... Success: 0x20=’ ’ score=2
> Reading at malicious_x = 0xffffffffffdfebfc... Success: 0x53=’S’ score=2
> Reading at malicious_x = 0xffffffffffdfebfd... Success: 0x71=’q’ score=2
> Reading at malicious_x = 0xffffffffffdfebfe... Success: 0x75=’u’ score=2
> Reading at malicious_x = 0xffffffffffdfebff... Success: 0x65=’e’ score=2
> Reading at malicious_x = 0xffffffffffdfec00... Success: 0x61=’a’ score=2
> Reading at malicious_x = 0xffffffffffdfec01... Success: 0x6D=’m’ score=2
> Reading at malicious_x = 0xffffffffffdfec02... Success: 0x69=’i’ score=2
> Reading at malicious_x = 0xffffffffffdfec03... Success: 0x73=’s’ score=2
> Reading at malicious_x = 0xffffffffffdfec04... Success: 0x68=’h’ score=2
> Reading at malicious_x = 0xffffffffffdfec05... Success: 0x20=’ ’ score=2
> Reading at malicious_x = 0xffffffffffdfec06... Success: 0x4F=’O’ score=2
> Reading at malicious_x = 0xffffffffffdfec07... Success: 0x73=’s’ score=2
> Reading at malicious_x = 0xffffffffffdfec08... Success: 0x73=’s’ score=2
> Reading at malicious_x = 0xffffffffffdfec09... Success: 0x69=’i’ score=2
> Reading at malicious_x = 0xffffffffffdfec0a... Success: 0x66=’f’ score=2
> Reading at malicious_x = 0xffffffffffdfec0b... Success: 0x72=’r’ score=2
> Reading at malicious_x = 0xffffffffffdfec0c... Success: 0x61=’a’ score=2
> Reading at malicious_x = 0xffffffffffdfec0d... Success: 0x67=’g’ score=7
> (second best: 0x42=’B’ score=1)
> Reading at malicious_x = 0xffffffffffdfec0e... Success: 0x65=’e’ score=2
> Reading at malicious_x = 0xffffffffffdfec0f... Success: 0x2E=’.’ score=2
> 
>