Re: Auditd doesn't receive syscalls after installation for the current shell.

On Wednesday, May 24, 2023 7:37:27 AM EDT Rinat Gadelshin wrote: > Hello there. > > It seems that the kernel doesn't send messages for syscalls of the shell > process from which auditd is installed. > > Reproducing steps (performed on Ubuntu 22.04 x86_64 on virtual box by > `root`): > > step #1: $ apt install auditd > step #2: $ auditctl -a always,exit -F arch=b64 -S openat,renameat2,unlinkat > step #3: $ echo t>delme;echo t2>>delme;cat delme;mv delme d;mv d > delme;rm delme > step #4: $ service auditd stop > step #5: $ ausearch -f delme > > There are syscalls from /usr/bin/cat, /usr/bin/mv, /usr/bin/rm but there > are no any syscalls (openat expected) > for /usr/bin/bash (current shell process) for the file. > > If step #3 is performed from another tty, then openat syscalls > (CREATE for the first echo and NORMAL for the second one) > is logged for the /usr/bin/bash process. > > `uname -a` returns: Linux grin-vb-ubuntu-22-0-4 5.19.0-41-generic > #42~22.04.01-Ubuntu SMP PREEMPT_DYNAMIC Tue Apr 18 17:40:00 UTC 2 x86_64 > x86_64 x86_64 GNU/Linux > > Should I open an issue for the case at > https://github.com/linux-audit/audit-kernel ? Are you booting with audit=1 ? If not, the install process and any before it are not auditable. You will only get events for processes started after audit enabled = 1.