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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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What is going on with /sys/kernel/notes ? (self.linux)

submitted 11 months ago by mvirts to c/[email protected]

3 comments fedilink hide all child comments

Any thoughts on why cat /sys/kernel/notes gives me:

LinuxLinuXen@ XenlinuxXen2.Xenxen-3.Xen��XenXen��&�� XenXeXeXen��XeXengenericXen Xenyes

I'm beginning to look into another issue I posted about, but this struck me as odd

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[–] [email protected] 19 points 11 months ago (1 children)

It was added in a patch to 2.6.23

Notes from the coder:

The bonus feature in my patch series adds the magic file /sys/kernel/notes. Reading this gives you the binary contents of the ELF notes section built into the kernel. Here you can find the build ID of the running kernel. This gives a solution to a problem that has arisen for systemtap users, where nothing prevents them from using the kernel-debuginfo.i586 data to drive Systemtap's probe details, but are actually running the kernel from the kernel.i686 rpm. This is a failure on many levels, but some simple sanity-checking at the bottom always helps. Now it is easy to verify you have the right debuginfo file for the kernel you are running.

This is incorporated upstream now.

[–] Static_Rocket 11 points 11 months ago

Yep, from kernel/ksysfs.c

/*
 * Make /sys/kernel/notes give the raw contents of our kernel .notes section.
 */

[–] Static_Rocket 4 points 11 months ago

There's a bunch of other data being printed aside from the usual printable characters. Run it through strings if you want something human readable.

As to what that extra data is... I actually don't know off hand. Let's see if the mailing list has any info...