Linux Syscall Table

Searchable linux syscall table for x86 and x86 64. The first thing to consider when adding a new system call is whether one of the alternatives might be suitable instead. Copied from that manpage.

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Linux syscall table. Biswapriyo sep 3 19 at 19 52 biswapriyo it is that s part of the abi stability which the kernel developers always try to preserve. Initialization of the system calls table. Is the syscall table stable between linux kernel version and future ones. On linux the man syscall 2 is a good start to find out how to make a system call in various architectures.

When the syscall interface was called via the int 0x80 instruction the cpu would pass control to the os. Originally invoking a syscall in linux was actually a pretty expensive process as it was implemented as a system interrupt int 0x80. 64 bit x86 uses syscall instead of interrupt 0x80. The exercise of which i am speaking is the following.

For completeness it s also nice to set up a mapping so that user mode linux still works its syscall table will reference stub xyzzy. There are some tables like this around but they are usually cool auto generated hacks and that has the downfall of not distinguishing what of the different implementations is the correct one etc. The result value will be in rax to find the implementation of a system call grep the kernel tree for syscall define syscall. In past versions of the linux kernel there was an explicit variable for the syscall table with the namesyscall table but it got removed for obvious reasons so attackers had to think about new.

Architecture calling conventions every architecture has its own way of invoking and passing arguments to the kernel. In this part we will look at what occurs in the linux kernel when the syscall instruction is met by the processor. Add an entry to the end of the system call table this needs to be done for each architecture that supports the system call which for most calls is all the architectures the position of the syscall in the table starting at zero is its system call number. An application must fill general purpose registers with the correct values in the correct order and use the syscall instruction to make the actual system call.