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OUTREACHYINTRO
KERNELHACKINGTOOLS
INTERNALKERNELDATATYPES The following code snippet from the drivers/char/serial.c file in the rs_open () function shows how this is done: There are some native kernel data types that you should use instead of trying to use an unsigned long. Some of these are: pid_t, key_t, gid_t, size_t, ssize_t, ptrdiff_t, time_t, clock_t, andKERNELBOOKS/ULNI
Understanding Linux Network Internals. Christian Benvenuti. O'Reilly, 1st Edition, 2005. ISBN 0-596-00255-6. This book gives a great overview of the linux networking internals. In particular, it describes what happens during frame transmission and reception in great detail. I like this book because it gives the big picture alongand ties it
BRIDGING_AND_FORWARDING The Bridges use the br_dev_setup (struct net_device* netdev) routine to set up the bridge.The br_dev_setup () routine is invoked in new_bridge_dev () function by calling allocate_dev () to which br_dev_setup () is given as function pointer. The kernel distinguishes the bridge from other devices if the IFF_EBRIDGE flag is set in structnet_device.
ACCESSINGPCIMEMORY
If you wish to access the memory location of a specific PCI device that has not been initialized by the Linux PCI core yet, you can use the following functions that are present in the pci_hotplug core code: Toggle line numbers. 1 int pci_read_config_byte_nodev(struct pci_ops *ops, u8 bus, u8 device, 2 u8 function, int where, u8 *val); 3 int pciSIMPLE_UDP_SERVER
I've been playing for a while with sockets in kernel-space, that's the way i've found to have a kernel thread listening on a UDP port . Howto create a UDP Server in kernel-space (for Linux 2.6) DATA TRANSFER FROM KERNEL TO USER SPACE On Tue, Jul 12, 2011 at 9:56 AM, Amit Nagal wrote: > On Tue, Jul 12, 2011 at 11:51 AM, Tirtha Ghosh wrote: >> Use a shared memory between user space and kernel space. >> The same physical memory can be translated as user-space virtual address as >> well as kernel space.>> See more about mmap, io_remap_pfn_range etc. and you will get an idea. WHAT'S THE MEANING OF CONFIG_BROKEN_ON_SMP? Hi, I compiled a driver, ang get the following message: CONFIG_BROKEN_ON_SMP: should be set in the kernel configuration, but isn't. Somebody suggested to disable the kernel's SMP feature. LINUX_KERNEL_NEWBIES Linux_Kernel_Newbies - Linux Kernel Newbies. Kernelnewbies is a community of aspiring Linux kernel developers who work to improve their Kernel s and more experienced developers willing to share their knowledge. Kernelnewbies can be found onOUTREACHYINTRO
KERNELHACKINGTOOLS
INTERNALKERNELDATATYPES The following code snippet from the drivers/char/serial.c file in the rs_open () function shows how this is done: There are some native kernel data types that you should use instead of trying to use an unsigned long. Some of these are: pid_t, key_t, gid_t, size_t, ssize_t, ptrdiff_t, time_t, clock_t, andKERNELBOOKS/ULNI
Understanding Linux Network Internals. Christian Benvenuti. O'Reilly, 1st Edition, 2005. ISBN 0-596-00255-6. This book gives a great overview of the linux networking internals. In particular, it describes what happens during frame transmission and reception in great detail. I like this book because it gives the big picture alongand ties it
BRIDGING_AND_FORWARDING The Bridges use the br_dev_setup (struct net_device* netdev) routine to set up the bridge.The br_dev_setup () routine is invoked in new_bridge_dev () function by calling allocate_dev () to which br_dev_setup () is given as function pointer. The kernel distinguishes the bridge from other devices if the IFF_EBRIDGE flag is set in structnet_device.
ACCESSINGPCIMEMORY
If you wish to access the memory location of a specific PCI device that has not been initialized by the Linux PCI core yet, you can use the following functions that are present in the pci_hotplug core code: Toggle line numbers. 1 int pci_read_config_byte_nodev(struct pci_ops *ops, u8 bus, u8 device, 2 u8 function, int where, u8 *val); 3 int pciSIMPLE_UDP_SERVER
I've been playing for a while with sockets in kernel-space, that's the way i've found to have a kernel thread listening on a UDP port . Howto create a UDP Server in kernel-space (for Linux 2.6) DATA TRANSFER FROM KERNEL TO USER SPACE On Tue, Jul 12, 2011 at 9:56 AM, Amit Nagal wrote: > On Tue, Jul 12, 2011 at 11:51 AM, Tirtha Ghosh wrote: >> Use a shared memory between user space and kernel space. >> The same physical memory can be translated as user-space virtual address as >> well as kernel space.>> See more about mmap, io_remap_pfn_range etc. and you will get an idea. WHAT'S THE MEANING OF CONFIG_BROKEN_ON_SMP? Hi, I compiled a driver, ang get the following message: CONFIG_BROKEN_ON_SMP: should be set in the kernel configuration, but isn't. Somebody suggested to disable the kernel's SMP feature.KERNELBUILD
To build the Linux kernel from source, you need several tools: git, make, gcc, libssl-dev and (optionally) ctags, cscope, and/or ncurses-dev. The tool packages may be called something else in your Linux distribution, so you may need to search for the package. The ncurses-dev tools are used if you "make menuconfig" or "make nconfig".KERNELPROJECTS
KernelProjects - Linux Kernel Newbies. There are many ways for people to start out in Linux kernel development. One good place to start is the KernelJanitors project, where you can become familiar with the Linux kernel source tree and development style by making small cleanups and bug fixes all over the tree, together with the otherkernel
ABI - LINUX KERNEL NEWBIES Linux ABI. As a newbie you must have wondered how the kernel executes compiled code? How does the compiler running in user space generate code that the kernel is able to understand and execute? The straightforward and easy answer is - through a shared standard called ELF. Amongst the most important features of ELF is the functioncalling sequence.
INTERNALKERNELDATATYPES The following code snippet from the drivers/char/serial.c file in the rs_open () function shows how this is done: There are some native kernel data types that you should use instead of trying to use an unsigned long. Some of these are: pid_t, key_t, gid_t, size_t, ssize_t, ptrdiff_t, time_t, clock_t, andOUTREACHYINTRO
The kernel is the most basic layer of the Linux operating system. It encompasses many things: hardware drivers, filesystems, security, task scheduling, and much more. News This year, we ask that you send all patches to the appropriate staging driver maintainers, as well as to the outreachy mailing list. See Submit a patch for more information.ROOTFILESYSTEM
How Is The Root File System Found? One of the important kernel boot parameters is "root=", which tells the kernel where to find the root filesystem. For instance, root=/dev/hda1. This is commonly specified as what looks like a standard Unix pathname (as above). But standard Unix pathnames are interpreted according to currently-mountedfilesystems.
LINUX_3.0 - LINUX KERNEL NEWBIES Linux 3.0 released on 21 Jul, 2011 . Summary: Besides a new version numbering scheme, Linux 3.0 also has several new features: Btrfs data scrubbing and automatic defragmentation, XEN Dom0 support, unprivileged ICMP_ECHO, wake on WLAN, Berkeley Packet Filter JIT filtering, a memcached-like system for the page cache, a sendmmsg() syscall that batches sendmsg() calls and setns(), a syscallLINUX_2_6_38
Linux 2.6.38 released 14 March, 2011. Summary: This release adds support for a automatic process grouping (called "the wonder patch" in the news), significant scalability improvements in the VFS, Btrfs LZO compression and read-only snapshots, support for the B.A.T.M.A.N. mesh protocol (which helps to provide network connectivity in the presence of natural disasters, military conflicts or GITTIPS - LINUX KERNEL NEWBIES Once you've made your changes, you should run: git rebase --continue. You can always abort the rebase by running: git rebase --abort. Sometimes when you amend commits, you will run into conflicts. Git will place conflict markers ('') in the effected files. You need to resolve those conflicts by editing the file, adding them withACCESSINGPCIMEMORY
If you wish to access the memory location of a specific PCI device that has not been initialized by the Linux PCI core yet, you can use the following functions that are present in the pci_hotplug core code: Toggle line numbers. 1 int pci_read_config_byte_nodev(struct pci_ops *ops, u8 bus, u8 device, 2 u8 function, int where, u8 *val); 3 int pci Toggle sidebar Toggle navigation* Comments
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Kernelnewbies is a community of aspiring Linux kernel developers who work to improve their Kernel s and more experienced developers willing to share their knowledge. Kernelnewbies can be found on the MailingList , IRC (irc.oftc.net #kernelnewbies), and this wiki.OUTREACHY
Potential Outreachy applicants, please go to the Outreachy intro page.
CHANGELOG
A human readable changelog for the Linux kernel can be found on theLinuxChanges page.
REPORTING BUGS
If you think you've found a Linux kernel bug, follow the directions on the FoundBug page to report it.HACKING
So you want to be a Linux kernel developer? Go complete our tutorial for creating your first kernel patch, or read Linux Kernel Hacking . Do you want to figure out how a certain kernel subsystem works? Go to our subsystems page.GLOSSARY
Confused by kernel terminology? Look at our KernelGlossary...
FREQUENTLY ASKED QUESTIONS Common questions and answers about kernel development can be found inour FAQ .
DOCUMENTATION
An effort to organize all the pieces of useful information on the Internet about kernel hacking into a single place can be found at theDocuments page.
PLEASE EDIT OUR WIKI KernelNewbies is all about sharing knowledge and experience. If you feel inspired or just want to make sure you will remember something you found out, please contribute to this wiki. Thank you. To prevent wiki spam, only users on this list are allowed to edit the wiki. Any of these users can add new usernames to the list. If you need to be on the list, please ask in #kernelnewbies on irc.oftc.net or on the mailing list . After logging in (using the UserPreferences page, and assuming you're on the trusted list ), you can edit any page by pressing the link near the top of the page. Capitalized words joined together form a WikiName , which hyperlinks to another page. The highlighted title searches for all pages that link to the current page. Pages which do not yet exist are linked with a question mark: just follow the link and you can add a definition. To learn more about what a WikiWikiWeb is, read aboutWhyWikiWorks .
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