LFS201 - Chapter 11 - /sys/devices/system/cpu/vulnerabilities
Chapter 11 doesn't sound good. Joke aside, there is this folder in the /sys pseudo filesystem:
/sys/devices/system/cpu/vulnerabilities
I wonder if we can use that to check for vulnerability mitigations that are available/active in the running system?
It becomes even more relevant when running the OS in a VM. Some mitigations need to be enabled in the hypervisor to be available to the VM. This would make it easy to see if the hypervisor/VM is correctly configured.
Just an idea.
Comments
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It also shows how your kernel is configured, as in:
c8:/sys/devices/system>ls -lF cpu/vulnerabilities/ total 0 -r--r--r-- 1 root root 4096 Jun 23 08:05 itlb_multihit -r--r--r-- 1 root root 4096 Jun 23 08:05 l1tf -r--r--r-- 1 root root 4096 Jun 23 08:05 mds -r--r--r-- 1 root root 4096 Jun 23 08:05 meltdown -r--r--r-- 1 root root 4096 Jun 23 08:05 spec_store_bypass -r--r--r-- 1 root root 4096 Jun 23 08:05 spectre_v1 -r--r--r-- 1 root root 4096 Jun 23 08:05 spectre_v2 -r--r--r-- 1 root root 4096 Jun 23 08:05 srbds -r--r--r-- 1 root root 4096 Jun 23 08:05 tsx_async_abort c8:/sys/devices/system>
Looking at individual entries you can see how the system is dealing with them, as in:
c8:/sys/devices/system/cpu/vulnerabilities>cat srbds Vulnerable: No microcode c8:/sys/devices/system/cpu/vulnerabilities>cat meltdown Mitigation: PTI c8:/sys/devices/system/cpu/vulnerabilities>
Interpretation of the information requires some work I'm not sure when this
entry was put in /sys but systems running "old" kernels probably won't have it.1 -
Thanks coop! Very helpful.
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LFS 201 - Lab 11.1
I am getting the following error while trying to install stress-ng :
[mc75@localhost git-test]$ git clone git://kernel.ubuntu.com/cking/stress-ng.git
Cloning into 'stress-ng'...
remote: Counting objects: 31600, done.
remote: Compressing objects: 100% (12911/12911), done.
remote: Total 31600 (delta 24533), reused 24974 (delta 18660)
Receiving objects: 100% (31600/31600), 6.11 MiB | 2.52 MiB/s, done.
Resolving deltas: 100% (24533/24533), done.
[mc75@localhost git-test]$ cd stress-ng
[mc75@localhost stress-ng]$ make
bash: make: command not found...
Failed to search for file: Cannot update read-only repoAny feedback ?
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Your system is missing development tools. (says there is no make). I don't know what distribution you are on, but you can do
apt-get install make (or yum install make) etc.
Even better, do ./ready-for.sh --install LFS201 after you download the script from https://training.linuxfoundation.org/cm/prep
It's likely you are missing other packages you may need later. (Note on most distributions you do not need to install from the git repo; you can do apt-get (or yum) install stress-ng
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I have installed the script, thanks.
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Though I was able to install stress-ng as evinced by :
[mc75@localhost /]$ cd stress-ng
[mc75@localhost stress-ng]$ make
make makeconfig
make[1]: Entering directory '/stress-ng'
make[1]: Leaving directory '/stress-ng'
make stress-ng
make[1]: Entering directory '/stress-ng'
make[1]: 'stress-ng' is up to date.
make[1]: Leaving directory '/stress-ng'I am not being able to execute stress-ng
bash: stress-ng: command not found...
Failed to search for file: Cannot update read-only repoWhat am I doing wrong ?
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you need to type ./stress-ng (to put it in the path) and even better do "make install" and then you should be able to run it from anywhere.
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Hi @moulinath , what distro and version are you running? It may be easier to install the package using apt or yum/dnf.
Regards,
Luis.0 -
I could finally run it, thanks.
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I'm glad you make it work
Luis.
0
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