linux-kernel - [Demo/lkm] Kcoredump -- Do coredump in any where of kernel(not same with kcore)

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Message-ID: <daef60380909220141y4b3b73fcj5ac024ddba144588@mail.gmail.com>
Date:	Tue, 22 Sep 2009 16:41:55 +0800
From:	Hui Zhu <teawater@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: [Demo/lkm] Kcoredump -- Do coredump in any where of kernel(not same 
	with kcore)

Hi guys,

Kcoredump do a coredump in most part of kernel (it use kprobe, it can
be set most of part of kernel).  For example:
insmod kcoredump.ko name=do_fork offset=11
gdb ./vmlinux /proc/kcoredump
Core was generated by `'.
[New process 0]
#0  do_fork (clone_flags=18874385, stack_start=3219612376, regs=0xc6c8ffb4,
    stack_size=0, parent_tidptr=0x0, child_tidptr=0xb764b758)
    at /home/teawater/kernel/linux-2.6/kernel/fork.c:1343

warning: Source file is more recent than executable.
1343		if (clone_flags & CLONE_NEWUSER) {
(gdb) bt
#0  do_fork (clone_flags=18874385, stack_start=3219612376, regs=0xc6c8ffb4,
    stack_size=0, parent_tidptr=0x0, child_tidptr=0xb764b758)
    at /home/teawater/kernel/linux-2.6/kernel/fork.c:1343
#1  0xc01016d5 in sys_clone (regs=0xc6c8ffb4)
    at /home/teawater/kernel/linux-2.6/arch/x86/kernel/process_32.c:445
#2  0xc0102da1 in system_call ()
    at /home/teawater/kernel/linux-2.6/arch/x86/kernel/entry_32.S:529
#3  0x00000000 in ?? ()

Now, it is just a demo version.  It just support x86_32.  But make it
support other arch is not very hard.

Thanks,
Hui

View attachment "kcoredump.c" of type "text/x-csrc" (9542 bytes)

Download attachment "Makefile" of type "application/octet-stream" (248 bytes)