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POChanging linux kernel system call number
 

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  1. POChanging linux kernel system call number
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    <p>I wanted to build my own custom kernel with a different syscall table. (same syscalls but in different position/numbers)</p> <p>I was working on kernel 3.2.29.</p> <p>Changing the kernel was quite easy:</p> <p>1) changing the syscall position in ‫‪arch/x86/kernel/syscall_table_32.S‬‬</p> <p>2) changing the syscall macro number in arch/x86/include/asm/unistd_32.h</p> <p>3) compiling and installing the new kernel</p> <p>I switched the syscalls around: <code>sys_open</code> took the place and number of <code>sys_read</code>, and vice versa.</p> <p>I figured that if I compile <code>glibc</code> with the modified kernel headers, I could have a running system, but unfortunately, it wasn't enough and my system won't boot.</p> <p>Am I missing something? What else do I need to do in order to have a running system?</p> <hr> <p>The steps I have taken are:</p> <p>1) building and installing the kernel as described in my question</p> <p>2) extracting the new kernel headers using <code>make headers_install INSTALL_HDR_PATH=[path]</code></p> <p>3) building glibc with the parameter <code>--with-headers=[path/include]</code></p> <p>4) I used a live cd to access the file system externally in order to install the new <code>glibc</code>, using the <code>make install install_root=[the original file system]</code> (so the system won't break during the install)</p> <p>I hope that the new <code>glibc</code> was built properly, but I am not sure.</p> <p>After that, when booting the system, the boot stops in the (initrafms) shell screen: I guess I need to rebuild the <code>initrd</code>, but how do I compile it according to the new syscall table?</p>
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    1. COPlease don't close-vote on-topic questions, especially when they have upvotes and answers.
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      1. USChris Stratton
    2. COWhy would one do that?
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      1. USJonas Wielicki
    3. CO@JonasWielicki before someone "helpfully" edited it out of the question, it was explained that this was experimentation subsequent to a school assignment to add a new syscall. While of questionable utility, the change contemplated here certainly calls attention to how things work and that there are many dependencies. Hacking up a system that no one depends on can be a great way to learn things.
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      1. USChris Stratton
 

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