freebsd-src | The FreeBSD src tree publish-only repository

by freebsd C Version: release/13.2.0 License: Non-SPDX

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kandi X-RAY | freebsd-src Summary

freebsd-src is a C library. freebsd-src has no bugs, it has no vulnerabilities and it has medium support. However freebsd-src has a Non-SPDX License. You can download it from GitHub.

This is the top level of the FreeBSD source directory. FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices. For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information. The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), FreeBSD handbook on building userland, and Handbook for kernels for more information, including setting make(1) variables.

Support

Quality

Security

License

Reuse

Support

freebsd-src has a medium active ecosystem.

It has 6930 star(s) with 2620 fork(s). There are 477 watchers for this library.

It had no major release in the last 6 months.

freebsd-src has no issues reported. There are 36 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of freebsd-src is release/13.2.0

Quality

freebsd-src has no bugs reported.

Security

freebsd-src has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

freebsd-src has a Non-SPDX License.

Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

Reuse

freebsd-src releases are not available. You will need to build from source code and install.

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freebsd-src Key Features

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freebsd-src Examples and Code Snippets

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Community Discussions

Trending Discussions on freebsd-src

How can I build FreeBSD from source correctly?

GDB watch DMA controller memory access on x86

QUESTION

How can I build FreeBSD from source correctly?

Asked 2022-Mar-27 at 22:57

I am trying to build FreeBSD from source to see how it works. I googled how to do it, and most of the websites explaining how to build the world tell me to run this command inside the directory of the source code:

...

ANSWER

Answered 2022-Mar-27 at 22:57

We don't need to see the makefile, because this error is being printed by make due to an invalid command line argument which means it's never even opening the makefile before it fails.

The reason is that -D, etc. are not valid command line options to GNU make. If you run man make (or look online for the GNU make manual) you'll see that -D is not listed as a valid option.

My suspicion is that when the websites you are reading are suggesting that you run make, they mean you should run FreeBSD make, which does support a -D option: https://www.freebsd.org/cgi/man.cgi?make(1)

You are trying to run this using GNU make, which does not have that option.

Source https://stackoverflow.com/questions/71639791

QUESTION

GDB watch DMA controller memory access on x86

Asked 2022-Jan-28 at 11:41

I run FreeBSD-based kernel as QEMU/KVM guest.

I'm working on a FreeBSD-based OS kernel SCSI driver and have an issue with read system call produces corrupted data.

To troubleshoot the problem I use the Kernel running in QEMU and would like to trace memory access performed by the DMA controller which is responsible for delivering data into the user-supplied buffer. In case of QEMU The controller is QEMU SCSI/ATA Disk device. So I tried to set a watchpoint on a user supplied buffer

Example:

Setting the breakpoint on int sys_read(struct thread *td, struct read_args *uap) I got some buffer arrived from the user:

...

ANSWER

Answered 2022-Jan-28 at 11:41

The watchpoint handling provided for QEMU's gdbstub is really only intended to work with accesses done by the guest CPU, not for those done by DMA from emulated devices. I'm surprised it hits at all, and not surprised that the behaviour is a bit weird.

If you can repro this on a QEMU setup using purely emulation (ie not KVM, hvf or whpx), then my suggestion for debugging this would be to run QEMU itself in a host gdb, and use the host gdb to set a watchpoint on the host memory that corresponds to the relevant bit of guest memory. Unfortunately that requires some knowledge of QEMU internals to find the host memory, and generally to understand what's going on and relate what QEMU is doing to what the guest execution is.

Supplementary debugging tip: if you can take a 'snapshot' just before the bug is triggered, that gives you a shorter reproduce case which is "load from snapshot and trigger bug" rather than "boot entire guest OS and userspace then trigger bug". More detail in this blog post.

Supplementary debugging tip 2: if you take the "debug QEMU with host gdb" approach, you can use the reverse-debugger rr, which is very handy for memory-corruption bugs, because you can say "now execute backwards to whatever last touched this memory". More info in this post.

Source https://stackoverflow.com/questions/70889241

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install freebsd-src

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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