Arch linux detected as vulnerable

zarere commented 6 years ago

Hi there,

As you can see in the below output I should't be affected:

martin@marto ~]$ zgrep CONFIG_PAGE_TABLE_ISOLATION /proc/config.gz
CONFIG_PAGE_TABLE_ISOLATION=y

[martin@marto ~]$ dmesg | grep iso
[    0.000000] Kernel/User page tables isolation: enabled

But after running your script I see the following:

[martin@marto ~]$ sudo sh spectre-meltdown-checker.sh
Spectre and Meltdown mitigation detection tool v0.27

Checking for vulnerabilities against live running kernel Linux 4.14.13-1-ARCH #1 SMP PREEMPT Wed Jan 10 11:14:50 UTC 2018 x86_64

CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'
* Checking count of LFENCE opcodes in kernel:  NO 
> STATUS:  VULNERABLE  (only 21 opcodes found, should be >= 70, heuristic to be improved when official patches become available)

CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'
* Mitigation 1
*   Hardware (CPU microcode) support for mitigation:  NO 
*   Kernel support for IBRS:  NO 
*   IBRS enabled for Kernel space:  NO 
*   IBRS enabled for User space:  NO 
* Mitigation 2
*   Kernel compiled with retpoline option:  NO 
*   Kernel compiled with a retpoline-aware compiler:  NO 
> STATUS:  VULNERABLE  (IBRS hardware + kernel support OR kernel with retpoline are needed to mitigate the vulnerability)

CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'
* Kernel supports Page Table Isolation (PTI):  YES 
* PTI enabled and active:  YES 
> STATUS:  NOT VULNERABLE  (PTI mitigates the vulnerability)

A false sense of security is worse than no security at all, see --disclaimer
[martin@marto ~]$

I think someting is wrong here.Please advise.

keachi commented 6 years ago

IMHO, the script detects, that you're not vulnerable against CVE-2017-5754 (Meltdown). Kernel/User page tables isolation is against Meltdown only and not against Spectre, so you're vulnerable (there is still no fix for Arch Linux).

speed47 commented 6 years ago

@zarere , what @keachi said is correct.

speed47 commented 6 years ago

Closing as the script output is correct, please reopen if needed.

speed47 / spectre-meltdown-checker

Arch linux detected as vulnerable #64