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Asked: 2022-04-11 13:04:08 +0800 CST

/sys/devices/system/cpu/vulnerabilities/mds permission denied

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I'm fairly new to Ubuntu, and I'm learning out of curiosity about it.

The book I'm reading was talking about journactl command, and I decided to check the listing for a particular boot. To my surprise, I discovered this warning:

MDS CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html for more details.

In th site, they advised to check the relevant sysfys file:

/sys/devices/system/cpu/vulnerabilities/mds

I've tried with my user, and it outputted permission denied, then I ran sudo -i, inserted the password, the thing $ transformed into #. So, right now, I assume I have root privileges. However, when I run # /sys/devices/system/cpu/vulnerabilities/mds, I get permission denied

If I run ls on that file, I get:

-r--r--r-- 1 root root 4096 abr 10 21:46 /sys/devices/system/cpu/vulnerabilities/mds

So, supposedly, any user should be able to read it...

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