ilammy / ftrace-hook Goto Github PK
View Code? Open in Web Editor NEWUsing ftrace for function hooking in Linux kernel
License: GNU General Public License v2.0
ftrace-hook's People
Contributors
Stargazers
Watchers
Forkers
0x4e38 porpoise-trend liuxc0116 fengjixuchui wreuven tisma oleglpts haidragon deathmemory jevey faxiang1230 agnosy hohjgdhsj yuzehome developer191 iipeace adhi1234 crackercat 2217936322 hossein-76 0x6b7966 arielmarco liumorgan 2020-fork wangxi19 rikeyone awen162 alfonmga ztehryan rounndel enginning eglinuxer luhaiyong jihetuxing waynejing opyu190617 zhanweiw yilas renecn theburn 26597925 nzcv orangice1997 sayosaru clayne linux-sir zcg19 sine-weed cutler-mamba syxoasis azwdski paranlee jim3ma ziyangjiao st-rnd gaohy1003 hoytluo quintonplatter trimagiccubeftrace-hook's Issues
can not work on arm64
I want to function hooking on arm64 but the code build fail
Could ftrace instrumentation be compiled into kernel ?
Hi,
I searched all the demo codes related to ftrace instrumentation, but all of that is compiled as a separate module, then using insmod to load it and rmmod to unload it, it does not satisfied me since I have to find a proper time to load this module.
I wanna compile it into linux kernel as a whole stuff rather a independent driver, and I does have a try, while the result is kernel crashed at the point of 'fh_trace_thunk' , could you give me some advise?
hook do_syscall_64 failed
I try to hook do_syscall_64, it worked. But when I rmmod the .ko file, the kernel crashed.
I hook do_syscall_64 like this and I haven't change the other code
Add support for kernel version <= 2.6.32
Can you add an example that works on 2.6.32?
sys_execve hook does not print the filename
In dmesg, I don't see the executable name as in the README, only (null):
[ +0,000114] ftrace_hook: execve() before: (null)
[ +0,000006] ftrace_hook: execve() after: -2
[ +0,000001] ftrace_hook: execve() before: (null)
[ +0,000003] ftrace_hook: execve() after: -2
[ +0,000001] ftrace_hook: execve() before: (null)
[ +0,000003] ftrace_hook: execve() after: -2
[ +0,000001] ftrace_hook: execve() before: (null)
[ +0,000002] ftrace_hook: execve() after: -2
[ +0,000001] ftrace_hook: execve() before: (null)
[ +0,000012] ftrace_hook: execve() after: -2
[ +0,000001] ftrace_hook: execve() before: (null)
[ +0,000166] ftrace_hook: execve() after: 0
That's still with Ubuntu 18.10 and kernel 4.18.0-15-generic.
I also added a hook on sys_mkdir and got the same problem with its pathname argument.
I tried in a VM with Ubuntu 18.04 and kernel 4.15.0-45-generic and there it works OK:
[ +0,000112] ftrace_hook: execve() before: /usr/local/sbin/tar
[ +0,000004] ftrace_hook: execve() after: -2
[ +0,000001] ftrace_hook: execve() before: /usr/local/bin/tar
[ +0,000001] ftrace_hook: execve() after: -2
[ +0,000001] ftrace_hook: execve() before: /usr/sbin/tar
[ +0,000002] ftrace_hook: execve() after: -2
[ +0,000001] ftrace_hook: execve() before: /usr/bin/tar
[ +0,000002] ftrace_hook: execve() after: -2
[ +0,000001] ftrace_hook: execve() before: /sbin/tar
[ +0,000001] ftrace_hook: execve() after: -2
[ +0,000001] ftrace_hook: execve() before: /bin/tar
[ +0,006984] ftrace_hook: execve() after: 0
Unknown symbol in module with kernel 4.18
I'm trying to compile and use this module but insmod fails (no modification of the code, just "make").
sudo insmod ftrace_hook.ko
insmod: ERROR: could not insert module ftrace_hook.ko: Unknown symbol in module
I am using Ubuntu 18.10 with kernel 4.18.0-15 (up-to-date).
dmesg does not print a single line about this and insmod has no verbose mode.
I don't see any "export" or "symbol" in the code.
Any idea as to what happens and how to fix this ?
The result of make is not as clean as the one in the README but there are only warnings so it may not be the source of the problem:
make
make -C /lib/modules/4.18.0-15-generic/build M=/home/stephane/Dev/linux-kernel/ftrace-hook modules
make[1]: Entering directory '/usr/src/linux-headers-4.18.0-15-generic'
CC [M] /home/stephane/Dev/linux-kernel/ftrace-hook/ftrace_hook.o
/home/stephane/Dev/linux-kernel/ftrace-hook/ftrace_hook.o: warning: objtool: duplicate_filename()+0x1c: call without frame pointer save/setup
/home/stephane/Dev/linux-kernel/ftrace-hook/ftrace_hook.o: warning: objtool: fh_sys_execve()+0x15: call without frame pointer save/setup
/home/stephane/Dev/linux-kernel/ftrace-hook/ftrace_hook.o: warning: objtool: fh_init()+0x12: call without frame pointer save/setup
/home/stephane/Dev/linux-kernel/ftrace-hook/ftrace_hook.o: warning: objtool: fh_exit()+0xc: call without frame pointer save/setup
/home/stephane/Dev/linux-kernel/ftrace-hook/ftrace_hook.o: warning: objtool: fh_sys_clone()+0x24: call without frame pointer save/setup
Building modules, stage 2.
MODPOST 1 modules
CC /home/stephane/Dev/linux-kernel/ftrace-hook/ftrace_hook.mod.o
LD [M] /home/stephane/Dev/linux-kernel/ftrace-hook/ftrace_hook.ko
make[1]: Leaving directory '/usr/src/linux-headers-4.18.0-15-generic'
can't compile
i am not able to compile due to an incomplete definition of struct ftrace_ops
kernel 5.0.10
Killed by kernal
void hook__skb_get_hash(struct sk_buff *skb)
{
pr_info("hook__skb_get_hash() before\n");
// __skb_get_hash(skb);
pr_info("hook__skb_get_hash() after\n");
}
static struct ftrace_hook demo_hooks[] = {
// HOOK("sys_clone", fh_sys_clone, &real_sys_clone),
HOOK("__skb_get_hash", hook__skb_get_hash, &__skb_get_hash),
};
Compilation warnings
Moudle works ! but compilation has some warning ...
make -C /lib/modules/5.15.0-46-generic/build M=/root/test modules
make[1]: Entering directory '/usr/src/linux-headers-5.15.0-46-generic'
CC [M] /root/test/ftrace_hook.o
/root/test/ftrace_hook.o: warning: objtool: duplicate_filename()+0x1d: call without frame pointer save/setup
/root/test/ftrace_hook.o: warning: objtool: fh_sys_execve()+0x10: call without frame pointer save/setup
/root/test/ftrace_hook.o: warning: objtool: fh_init()+0x13: call without frame pointer save/setup
/root/test/ftrace_hook.o: warning: objtool: fh_exit()+0xc: call without frame pointer save/setup
/root/test/ftrace_hook.o: warning: objtool: fh_sys_clone()+0x11: call without frame pointer save/setup
MODPOST /root/test/Module.symvers
CC [M] /root/test/ftrace_hook.mod.o
LD [M] /root/test/ftrace_hook.ko
BTF [M] /root/test/ftrace_hook.ko
Skipping BTF generation for /root/test/ftrace_hook.ko due to unavailability of vmlinux
make[1]: Leaving directory '/usr/src/linux-headers-5.15.0-46-generic'
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.