Selinux: changing root mapping
I want to control some accesses of root in Linux- fedora, for example, I want to run a process and I want root not to be able to kill it. I use SELinux and I changed root mapping from unconfined to …
Tag: kernel
Allocating memory for array of struct in linux kernel and got strange output od structs ids
I wrote a program in linux kernel, which should allocate memory for 5 simple structures each of with unique id, so i used static int in a constructor and increment it and in the end i just print …
How does OS kernel get notified when memory is accessed?
As far as I know, OS kernel maintains the translation from virtual address to physical address, and the userspace program uses virtual address, the CPU uses physical address. Since all machine codes …
how to get physical memory including reserved memory from linux kernel?
From linux’s proc.txt: MemTotal: Total usable ram (i.e. physical ram minus a few reserved But how to get the whole physical ram including reserved memory from linux kernel?
An kdump tool issue with the customized kernel
when we are using the kdump tool, we need to install the according kernel-debug*.rpm at first. My questions is , the linux I am using is compiled by myself with lots of modifications. When could I …
Using spi-bitbang driver
I am writing a kernel module to read and write to SPI device (CC1200). My linux device does not have native SPI, so I am trying to bit-bang the bus. I found that linux has built-in bitbang code (…
What happened my ttyS0 has no irq list in /proc/interrupt
In this system, it blocks(hang) in the following cases: echo “test” > /dev/ttyS0 cat /dev/ttyS0 #read nothing even scope show the UART data there stty -F /dev/ttyS0 115200 If I set serial …
How to monitor process creation and statistics using kernel module
I wrote a kernel module to monitor cpu and memory time series. Additionally to that, I would like to log all process creations (and their meta date like pid, cmdline, …) and also exists with their …
How does linux pick connect the mouse on my display to a driver in /dev/input/mouse*?
I am currently reading LDD3, and have some question about how Linux actually proesses input from a device in /dev/input/mouse*? When I cat /dev/input/mouse2 (for my logitech mouse) I see input when I …
Add syscalls to linux kernel
I’m new in working with kernel. I want to add a linked list to my kernel, and I try to fix it like this link : Linux Kernel Programming–Linked List here is code’s that I added to sys.c : syscall …