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Assessment Title
Rule Text
RHEL 9 must disable virtual system calls.
Description
Discussion Text
System calls are special routines in the Linux kernel, which userspace applications ask to do privileged tasks. Invoking a system call is an expensive operation because the processor must interrupt the currently executing task and switch context to kernel mode and then back to userspace after the system call completes. Virtual system calls map into user space a page that contains some variables and the implementation of some system calls. This allows the system calls System calls are special routines in the Linux kernel, which userspace applications ask to do privileged tasks. Invoking a system call is an expensive operation because the processor must interrupt the currently executing task and switch context to kernel mode and then back to userspace after the system call completes. Virtual system calls map into user space a page that contains some variables and the implementation of some system calls. This allows the system calls to be executed in user space to alleviate the context-switching expense.
Virtual system calls provide an opportunity of attack for a user who has control of the return instruction pointer. Disabling virtual system calls help to prevent return-oriented programming attacks via buffer overflows and overruns.
Satisfies: SRG-OS-000480-GPOS-00227, SRG-OS-000134-GPOS-00068
Virtual system calls provide an opportunity of attack for a user who has control of the return instruction pointer. Disabling virtual system calls help to prevent return-oriented programming attacks via buffer overflows and overruns.
Satisfies: SRG-OS-000480-GPOS-00227, SRG-OS-000134-GPOS-00068
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