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.
Questions tagged [kernel-module]
2228 questions
5
votes
2 answers
Sending SKB's for transmission from kernel space
I am currently writing a kernel module that modifies packet payloads as a learning experience. I have the packet modifications done, but now I want to send out this new modified packet after the original (I don't want to drop the original). I…
MacStation
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5
votes
0 answers
FreeBSD module debugging - cannot access memory at address
I am trying to hack/understand the nullfs kernel module (on FreeBSD) so to that end, I do the
following:
On the target machine:
kldstat gives:
Id Refs Address Size Name
1 10 0xffffffff80200000 17e10c8 kernel
2 1…
AjB
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5
votes
1 answer
Load kernel module from mac os sierra host to a docker container
I've juste installed a custom kernel module to enable SCTP support on my Macbook
And I would like to load this kernel module inside my docker container.
I tried to start a container using the --cap-add SYS_MODULE flag and install the libsctp-dev…
Razaborg
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5
votes
1 answer
How to fix : No rule to make target?
I am trying to build a demo kernel module, but when I do make, I get following,
make[1]: Entering directory '/usr/src/linux-headers-4.4.0-47-generic'
make[2]: *** No rule to make target 'arch/x86/entry/syscalls/syscall_32.tbl', needed by…
Sagar
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5
votes
4 answers
Linux kernel module compiling
I try to compile simple linux kernel module:
#include
#include
int init_module(void)
{
printk("Hello world 1.\n");
return 0;
}
void cleanup_module(void)
{
printk(KERN_ALERT…
0xAX
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5
votes
1 answer
Source code of keyboard driver of linux
I have been working on making my own keyboard driver for linux. So I came accross these two links: usbkbd.c and atkbd.c.
Now I am
confused which of these is the actual code driving my keyboard at the present. As I see it atkbd.c is quite gory and…
paramvir
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5
votes
1 answer
Creating new system calls via KLD in FreeBSD
Are there any good (entry-level) tutorials on adding system calls to FreeBSD via kernel loadable modules? Specifically, the required form of the methods, getting information from processes, etc.
dckrooney
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5
votes
1 answer
Performance profiling a KEXT
How to measure performance impact of a kext in OS X in terms of CPU, memory or thread usage during some user defined activities ? Any particular method tool that can be use from user land ? OR any approach/method that can be considered?
Utkarsh
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- 3
5
votes
0 answers
Virtual address to physical address translation in Linux proc module
I'm trying to create my own proc node "os_pagemap" on Linux(using odroid)
This node's goal is to print all physical memory page's information.
(sudo cat /proc/os_pagemap)
Like this :
[PHY] Virt 483252 Phy 266908 VMA 0 PID 5773 PNAME…
BlakStar
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- 11
5
votes
2 answers
How to get details of all modules / drivers that were initialized / probed during the Linux kernel boot?
I need the sequence of modules/drivers that are invoked|initialized|probed during the kernl boot.
Can you please let me know if any flash command-line option available to get this sequence ?
Raj
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5
votes
3 answers
Address mapping of PCI-memory in Kernel space
I'm trying to read and write to and PCI-device from a loadable kernel module.
Therefore I follow this post:
pci_enable_device(dev);
pci_request_regions(dev, "expdev");
bar1 = pci_iomap(dev, 1, 0);
// void iowrite32(u32 val, void __iomem…
Alex44
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5
votes
2 answers
no rule to make target for simple hello module
So I am trying to write a simple hello module no need to say a newbie :)
however while following steps to create a make file - what I saw was I didnot have build folder at uname -r/build so I created one - not sure that itself should be problem as…
thedreamer
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5
votes
2 answers
Can I have more than 32 netlink sockets in kernelspace?
I have several kernel modules which need to interact with userspace. Hence, each module has a Netlink socket.
My problem is that these sockets interfere with each other. This is because all of them register to the same Netlink address family…
Yd Ahhrk
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5
votes
2 answers
"Segmentation fault" when `rmmod` or `modprobe -r`
Trying the simplest kernel module from LDD3 without any modification on custom built kernel v4.1.0-rc6 for Beagle Bone board with BusyBox v1.23.0. The code for the module is as follows:
#include
#include…
Eugene Sh.
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5
votes
1 answer
Different privileges in kernel module execution
I have two places in a kernel module (Linux 3.13):
One is module_init
The other is code I hook with running an invalid opcode (by hacking interrupt description table).
My code is to enable hardware performance counter. When I put it in…
Richard
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