qemu + gdb + sample_code: Run sample code in QEMU OS and observe Linux Kernel behavior
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This document describes setting up a QEMU virtual machine with Ubuntu 20.04.1 to debug Linux kernel code using gdb. It has a 2-socket CPU configuration with 16GB of memory and disabled KASAN and ASLR. The QEMU VM can be used to run sample code and observe Linux kernel behavior under gdb, such as setting conditional breakpoints to analyze page fault behavior for mmap addresses by referencing a gdb debugging text file.
qemu + gdb + sample_code: Run sample code in QEMU OS and observe Linux Kernel behavior
- 1. * Based on kernel 6.2 (x86_64) – QEMU * 2-socket CPUs (4 cores/socket) * 16GB memory * Kernel parameter: nokaslr norandmaps * KASAN: disabled * Userspace: ASLR is disabled * Host OS: Ubuntu 20.04.1 qemu + gdb + sample_code: Run sample code in QEMU OS and observe Linux Kernel behavior Adrian Huang | Apr, 2023
- 2. qemu + gdb: The efficient way to understand/debug Linux kernel code/data structure Refer this slide first:
- 3. Console #2: gdb console Console #1: QEMU: Guest OS Observe page fault behavior about mmap address: Conditional breakpoint gdb-files/gdb-linux-kernel-real-mode.txt • 0x7ffff7ff9000 is the mmap address provide by Linux Kernel Reference: Memory Mapping Implementation (mmap) in Linux Kernel • Sample code to trigger the conditional breakpoint: t_mmap.c Note