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What is going on with /sys/kernel/notes ? (lemmy.world)
submitted 10 months ago by mvirts@lemmy.world to c/linux@lemmy.ml
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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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[-] sin_free_for_00_days@sopuli.xyz 20 points 10 months ago

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@lemmy.world 12 points 10 months ago

Yep, from kernel/ksysfs.c

/*
 * Make /sys/kernel/notes give the raw contents of our kernel .notes section.
 */
this post was submitted on 21 Jan 2024
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