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Advanced process execution monitoring utility for linux (procmon like)

License: Apache License 2.0

Makefile 0.22% C 99.78%

kernel syscalls linux process-monitor linux-kernel linux-process-monitor kernel-module c execve hooks

execmon's Issues

execmon is unable to run on kernels >= 4.6

Hi Kfir, thanks for this awesome utility. It helped me a lot.

Your utility, execmon, works well on kernels up till 4.5. I'd tested it on Ubuntu 16.04 with kernel 4.4.
Till kernel 4.5, assembly stubs had been used to call sys_execve and by patching call sys_execve in stub_execve did the job. Awesome !
But starting from 4.6 these stubs had been changed and now ptregs_sys_execve is a replace of stub_execve. But it's highly different than older stubs. Now registers are being used to store the real syscall address and there are two way calls 'slow_path' and 'fast_path'.
I'd tried hard but failing to make some logic that how to patch execve calls in this new scheme. Could you please spare some time to have a look and find some clues to upgrading execmon to work for kernels greater than 4.5.

thanks

error adding symbols: Archive has no index; run ranlib to add one

kernel version 4.13.0 make error: error adding symbols: Archive has no index; run ranlib to add one
why?

make error in ubuntu 18.04

In [49]: !make
make -C /lib/modules/5.4.0-132-generic/build M=/home/qgb/github/execmon/kmod
make[1]: Entering directory '/usr/src/linux-headers-5.4.0-132-generic'
  CC      /home/qgb/github/execmon/kmod/libudis86/decode.o
/home/qgb/github/execmon/kmod/libudis86/decode.c: In function ‘decode_operand’:
/home/qgb/github/execmon/kmod/libudis86/decode.c:744:18: warning: this statement may fall through [-Wimplicit-fallthrough=]
       u->br_far  = 1;
       ~~~~~~~~~~~^~~
/home/qgb/github/execmon/kmod/libudis86/decode.c:746:5: note: here
     case OP_M:
     ^~~~
/home/qgb/github/execmon/kmod/libudis86/decode.c:747:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
       if (MODRM_MOD(modrm(u)) == 3) {
          ^
/home/qgb/github/execmon/kmod/libudis86/decode.c:751:5: note: here
     case OP_E:
     ^~~~
/home/qgb/github/execmon/kmod/libudis86/decode.c:766:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
       if (MODRM_MOD(modrm(u)) != 3) {
          ^
/home/qgb/github/execmon/kmod/libudis86/decode.c:770:5: note: here
     case OP_Q:
     ^~~~
/home/qgb/github/execmon/kmod/libudis86/decode.c:777:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
       if (MODRM_MOD(modrm(u)) != 3) {
          ^
/home/qgb/github/execmon/kmod/libudis86/decode.c:781:5: note: here
     case OP_W:
     ^~~~
  CC      /home/qgb/github/execmon/kmod/libudis86/itab.o
  CC      /home/qgb/github/execmon/kmod/libudis86/udis86.o
  AR      /home/qgb/github/execmon/kmod/libudis86/built-in.a
  AR      /home/qgb/github/execmon/kmod/built-in.a
  CC [M]  /home/qgb/github/execmon/kmod/main.o
  CC [M]  /home/qgb/github/execmon/kmod/mem.o
  CC [M]  /home/qgb/github/execmon/kmod/syscalls.o
  CC [M]  /home/qgb/github/execmon/kmod/comm.o
  CC [M]  /home/qgb/github/execmon/kmod/proto.o
make[2]: *** No rule to make target '/home/qgb/github/execmon/kmod/libudis86/built-in.o', needed by '/home/qgb/github/execmon/kmod/execmon.o'.  Stop.
Makefile:1765: recipe for target '/home/qgb/github/execmon/kmod' failed
make[1]: *** [/home/qgb/github/execmon/kmod] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.4.0-132-generic'
Makefile:10: recipe for target 'all' failed
make: *** [all] Error 2

sys info

In [38]: !uname -a
Linux ubuntu 5.4.0-132-generic #148~18.04.1-Ubuntu SMP Mon Oct 24 20:41:14 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

In [39]: !cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.6 LTS"

after insmod execmon.ko,run gcc is segfault

I have tried.I insmmod execmon.ko ,execve moniter is normal.
but , The system GCC is abnormal, gcc hello.c is failed.
open /var/log/message

371 May 16 13:41:47 localhost kernel: gcc[21267]: segfault at 7fff30ab8d31 ip 00007fff30ab8d31 sp 00007fff30ab7848 error 15
372 May 16 13:41:47 localhost kernel: Process 21267(gcc) has RLIMIT_CORE set to 0
373 May 16 13:41:47 localhost kernel: Aborting core

rmmod execvemon.ko
gcc is normal.

Did you see this problem as well?

Have a look at monks

https://github.com/alexandernst/monks

Maybe we can join forces? Your project pretty much covers the missing parts of mine (patching execv and similar stubs) and mine covers the missing parts of yours (patching "normal" syscalls).

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