I get dozens of messages in the Log / kernel: Firewall: *TCP_IN Blocked* IN=eth0
VPS, Centos7, Panel, Centos Web Panel."Message, Log"I get dozens of messages in the log.I ask for help and opinion.Thank you very muchJan 5 18:18:23 hostnameserver kernel: Firewall: TCP_IN Blocked...
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Here is the output of a dmesg command on an instance running Linux potentially dealing with memory crunch. Any help on what do these logs mean?dmesg | tail -n 25[23498.234294]...
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In my linux header files folder on my Kali kernal 5.7.0 headers included in include directory /usr/src/linux-headers-5.7.0-kali1-common/include. Inside this folders I have header files contained in...
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So we have an hierarchy of several Linux kernel modules.Lets simply call them A, B, C, DA is a base module. It serves the others, but also provides some functionality on its own, it exposes a block...
View Articlelibbpf: failed to find BTF for extern 'unlikely': -2
I am trying to compile and run the sockex3 example (sockex3_user.c and sockex3_kern.c from v5.10) in a new project (out of the kernel tree) with libbpf v0.3 as submodule of my repository. I have...
View ArticleHow should I understand the 'less-compatible' names in the compatible list in...
This is part of a device file (linux/arch/arm/boot/dts/versatile-ab.dts)uart1: uart@101f2000 { compatible = "arm,pl011", "arm,primecell"; reg = <0x101f2000 0x1000>; interrupts = <13>;...
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Downloading Terraform onto linux OCI VM
I am currently trying to play around with some tf scripting in an OCI compartment I have access to.My current position is:I have successfully spun up a VM through the OCI console runningLinux 8 on it.I...
View Articleln: failed to create symbolic link : File exists [duplicate]
Can we create a symbolic link to existing directory?Example: I want to create a symlink from /var/logs to /dump/logs (/dump/logs is exiting directory)if i do ln -s /var/logs /dump/logs i get below...
View Articlehow to find out which ioports be assigned to my devices
has linux reserved io port numbers for all manufactured devices.I have devices like intel built-in network card. or another device I have for wifi (usb) from realtek.On linux repository on github,...
View ArticleHow to test/validate the IP fragment overlapping issue in the Linux kernel
I am facing IP fragment overlapping issue in Linux kernel 4.1.15I have tried with Linux Kernel Self tests (https://elixir.bootlin.com/linux/latest/source/tools/testing/selftests/net/ip_defrag.c) to...
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If a process sleep in TASK_KILLABLE state, we can kill it by signal 'SIGKILL' to it."kill -9 pid" will set sig in 'task_struct->signal->shared_pending', then wake up the process.But,...
View Article'ps' without kernel threads
I'm looking for some solutions to use ps auxf command to show all processes without kernel threads, or maybe anyone know any else program to filter that kernel process?What I've tried and found:ps...
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I have added a qdisc on ifb0 interface and added a class with a limit of 30000kbit.I have added two subclasses having limit of 4000kbit and 500kbit.tc qdisc del dev ifb0 roottc qdisc add dev ifb0 root...
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I wrote a program which should calculate the total size of arguments passed to execve system call.I have tested this program with maximum size of arguments, expecting that the "Argument list too long"...
View ArticleLTTng/Perf: Difference between events used for exiting (sched_process_exit)...
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View ArticleDisable reverse path filtering from Linux kernel space
Within a Linux kernel module, I need to disable rp_filter in some way.This would typically be possible from user-space via a couple of simple sysctl calls :sysctl net.ipv4.conf.all.rp_filter=0sysctl...
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I'm trying to understand a few pieces associated with using bitbake to compile the linux image and generating a boot image that would be used to flash onto the processor.How come bitbake virtual/kernel...
View ArticleKernel killed while there is plenty of available RAM
I am running a python program transforming all the .png files in a folder to a gif with the following code: import globfrom PIL import Imagefrom PIL import ImageFileImageFile.LOAD_TRUNCATED_IMAGES =...
View ArticleMendel Kernel Live Patching
Is there a way to live patch the kernel on Mendel? I'm looking to deploy the coral dev kit and need a way to ensure that it is up to date with the latest kernel security updates.It looks like the only...
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