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Questions tagged [linux-kernel]

Questions about Linux kernel and Linux kernel related topics eg. implementation details such as system calls, kernel customization, etc. For Linux user space topics which do not involve kernel details, [linux] or distribution tag are more suitable.

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Does fstat require disk access on Linux/ext4?

Linux Kernel 5.3 Consider the fstat syscall defined as int fstat(int fd, struct stat *statbuf);. Is disk access required for the fstat syscall on ext4? I did some research related to it and find out ...
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0answers
34 views

OS with no user-space functionality

Is there a generic OS (like Unix / Linux) that is supposed to work only in kernel (privileged, ring 0) mode? That is, an OS designed to work only in kernel mode, not having any userspace applications ...
1
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1answer
52 views

What do the Block Device Capability flags mean?

Linux block devices in sysfs have a capability file, partly documented here. Well, one is documented. Looking in genhd.h as it suggests, there are others. Is there any documentation on them, or does ...
1
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1answer
46 views

Kernel throws error while writing to the character device file in 4.9.82-ti-r102 debian 9.3

I created the device file under /dev folder successfully, but writing to that device file makes kernel to throw following error messages. Message from syslogd@beaglebone at Feb 26 15:40:10 ... kernel:...
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0answers
20 views

How to delete or shrink compiled kernel installation directory and still build an external module?

I am having trouble building external modules after compiling the linux kernel on an external device. It is the 4.19.103 kernel with the real time patch-4.19.103. My onboard storage disk is <3Gb ...
1
vote
1answer
29 views

SysRQ+B (boot) not working but O (turning off) is

For some reason, my Linux machine will properly turn off when striking SysRq+O, but won't reboot as expected when doing SysRq+B. Both of these ones show up in the help message (with SysRq+H) and all ...
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0answers
12 views

Kexec: Can installer available in initramfs access (to copy) a file in disk storage

I am trying to migrate from one linux(embedded) say host to another say guest(without pendrive). kexec -l <installer> --initrd=< initramfs.cpio containing actual guest installer> I have ...
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0answers
12 views

How to filter kernel parameter changes from kern.log?

I'm trying to add a use case to my SIEM where it triggers when kernel parameter change happen. I did some digging around the internet, but can't seems to find any method for filtering them from rest ...
0
votes
1answer
14 views

Scan PCI-Devices beginning root bridge

I am now looking for countless hours in the linux/pci.h and all connected files to understand how the PCI can be securely scanned (read-only) and then picking a pci_slot when the device matches. ...
1
vote
2answers
42 views

What application manages the consoles

With Alt + Fn you can switch between virtual consoles in most Linux distributions. What application handles the switching of consoles and how? I suppose it has to read the keyboard input before all ...
1
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0answers
26 views

Run Script On A (Music)Keyboard

I am asking this here because I believe my (musical) keyboard, a KORG PA4X, runs a form of linux kernel. The keyboard has a usb slot to access different beats and styles. Is there a way to code a usb ...
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0answers
12 views

Does ionice work with virtual block device(loop device and device mapper)?

The back-file located on cfq enabled hardware block device(/dev/sda) but seem the loop device no cfq scheduler and dm device is created based on that loop device also dm device itself no cfq scheduler....
42
votes
4answers
6k views

How does a linux GUI work at the lowest level?

I'm basically trying to figure out how one would go about making a GUI from absolute scratch with nothing but the linux kernel and programming in C. I am not looking to create a GUI desktop ...
0
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1answer
31 views

Make Modules_Install Fails

I am trying to install kernel modules, but when I run make modules_install, the following appears: INSTALL virt/lib/irqbypass.ko DEPMOD 4.19.97-gentoo depmod: ERROR: openat(1023, 4.19.97-...
0
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1answer
26 views

Build and use Linux kernel

I have Linux kernel source code. If I build and install it, how will operating system know that it has to use that kernel. I have a kernel 5.3, if I build XYZ kernel, how OS will understand to use new ...

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