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Questions tagged [kernel-module]

A kernel module is a run-time loadable object file that is loaded into operating system kernel to add functionality to a running kernel. Examples include device drivers and other kernel items.

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Two kernel modules, each uses netlink socket. How to use them both at the same time?

Good day. I would like to create two (almost same) modules - each module uses netlink socket and replies to the incoming message from userspace program. During the initialization of the first module, it executes the following command…
Jake Badlands
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Intercepting a system call

I have been trying to intercept the system call at the kernel level. I got the basic idea from this question . The system call I was trying to intercept was the fork(). So I found out the address of the sys_fork() from System.map and it turned out…
PaulDaviesC
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Can't Unload Kernel Extension; Classes Have Instances

I'm writing an OSX kernel extension for an audio device driver (it's software, but emulates a hardware device). During development, it'd be convenient to completely uninstall existing old versions and then build and install the new version from…
pje
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Trying to find all the kernel modules needed for my machine using shell script

I'm developing kernel modules right now, and the build times are starting to get under my skin. As a side effect I'm taking way too many "coffee" breaks during builds. So I was looking for a way to build only the stuffs I need for my platform.…
Aftnix
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How does the Linux kernel determine the order of __init calls?

There are many instances of __init calls in kernel both in drivers module_init and other functions of kernel. My doubt is how exactly kernel determines the sequence of the __init call. More importantly, How it also determine the sequence of driver…
0x07FC
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Compiling a driver as a part of a kernel, not as a module

I am trying to create a minimalistic Linux for an embedded device. That means the necessity of compiling kernel and drivers. One driver is written directly for the device's board by it's creator, so it is not a repository one. It can be compiled as…
Rusty Horse
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What Linux driver subsystem/API is used for a simple screen/monitor device?

I am developing an embedded system with a touchscreen. The touchscreen operates as both input and output, with a "virtual" keyboard overlaying the graphical output. I have a working device driver that reads input from the touch sensor and translates…
memtha
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Linux: modpost does not build anything

I am having problems getting any kernel modules to build on my machine. Whenever I build a module, modpost always says there are zero modules: MODPOST 0 modules To troubleshoot the problem, I wrote a test module (hello.c): #include …
waffleman
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Base address at which the linux kernel is loaded

I have a couple of doubts about how the kernel is loaded into memory. Upon inspecting /proc/kallsyms I'm able to find the address of various symbols in the kernel. $ cat /proc/kallsyms | head -n 10 00000000 t __vectors_start 80008240 T…
user277465
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Pool of Memory in Kernel driver for Multiple processes

Suppose we want to maintain a pool of memory in a device driver or module. How can that pool be created and be available to multiple processes lets say 4 processes, accessing this driver/module. Assume 1 MB of memory in the pool. When I was reading…
RootPhoenix
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Linux Kernel - Get last written memory block

In the linux kernel, are there any data structures that automatically always hold the last written block number for a partition? I can't find any built-in kernel source that could be used to get this information. Any help is appreciated.
NTek
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error: implicit declaration of function 'create_proc_read_entry' [-Werror=implicit-function-declaration]

I'm trying to compile a kernel module on kernel 3.13 and I get this error: error: implicit declaration of function 'create_proc_read_entry' [-Werror=implicit-function-declaration] I google it and did not found any response. Here is the part of the…
scof007
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MODULE.TARGET.SHARED_LIBRARIES.libjpeg already defined error

I am trying to build kernel for AOSP 4.4.2 for a device. When I compile the kernel I get build/core/base_rules.mk:134: *** vendor/google/libs: MODULE.TARGET.SHARED_LIBRARIES.libjpeg already defined by external/jpeg. Stop. I understand that the…
ChanChow
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kernel config file location in android

I need to compile custom kernel with dvb-t drivers as kernel modules on _rkm mk602_ android device with rk3066 processor. I have downloaded the kernel source for this processor, however I am having trouble configuring kernel for this device from…
Dreamo
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System call interception in linux-kernel module (kernel 3.5)

I need to replace a standard system call (e.g. SYS_mkdir) with my own implementation. As I read in some sources, including this question on Stackoverflow, the sys_call_table is not exported symbol since kernel version 2.6. I tried the following…
Alex
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