On 24 January 2018 at 10:53, Michael Fothergill <michael.fothergill@gmail.com> wrote:
The neowin link above has a link to a Phoronix article[1], which
suggests you need GCC 8.0, or maybe 7.3 if a backport succeeds. That was
9 days ago, of course ... Stretch only has 6.3, and even sid only has
7.2, so I don't see it hitting debian soon.
Richard
[1]
https://www.phoronix.com/scan.php?page=news_item&px=Linux-4. 9-4.14-Retpoline Some new patches are coming soon:I have posted a query on the gentoo forum asking if I have a recent enough version of gcc etc for the retpoline.There is a test program you can install and run and it will tell you if both the meltdown and spectre patched are installed which I will try out.Looks like your all going to have to run the latest kernels....(J)RegardsMFPS I installed the spectre meltdown checker and ran it:djt /home/mikef/spectre-meltdown-checker # ./spectre-meltdown-checker.sh
Spectre and Meltdown mitigation detection tool v0.32
Checking for vulnerabilities on current system
Kernel is Linux 4.14.14-gentoo #1 SMP Tue Jan 23 13:06:23 GMT 2018 x86_64
CPU is AMD A10-7850K Radeon R7, 12 Compute Cores 4C+8G
CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'
* Mitigated according to the /sys interface: NO (kernel confirms your system is vulnerable)
> STATUS: VULNERABLE (Vulnerable)
CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'
* Mitigated according to the /sys interface: NO (kernel confirms your system is vulnerable)
* Mitigation 1
* Hardware support (CPU microcode)
* Indirect Branch Restricted Speculation (IBRS)
* SPEC_CTRL MSR is available: NO
* CPU indicates IBRS capability: NO
* Indirect Branch Prediction Barrier (IBPB)
* PRED_CMD MSR is available: NO
* CPU indicates IBPB capability: NO
* Kernel is compiled with IBRS/IBPB support: NO
* Currently enabled features
* IBRS enabled for Kernel space: NO
* IBRS enabled for User space: NO
* IBPB enabled: NO
* Mitigation 2
* Kernel compiled with retpoline option: YES
* Kernel compiled with a retpoline-aware compiler: NO (kernel reports minimal retpoline compilation)
* Retpoline enabled: YES
> STATUS: VULNERABLE (Vulnerable: Minimal AMD ASM retpoline)
CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'
* Mitigated according to the /sys interface: YES (kernel confirms that your CPU is unaffected)
* Kernel supports Page Table Isolation (PTI): YES
* PTI enabled and active: NO
* Running under Xen PV (64 bits): NO
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as not vulnerable)
A false sense of security is worse than no security at all, see --disclaimer
djt /home/mikef/spectre-meltdown-checker # ie it's there but GCC 7.2 can't install it.If you look at the discussion here:you will see that I need to install gcc 7.3.0rc1time to compile your own kernels...CheersMF