Additional parameter in PROCTITLE.proctitle when executing rm

[Richard Guy Briggs]

On 2021-03-18 16:31, Alan Evangelista wrote:
> I'm trying to audit commands run in bash, including the commands arguments.
> The proctitle parameter in the PROCTITLE record seems to be the most
> reliable source to get that, but it does not contain exactly the "rm"
> command I have typed on bash. Example:
> 
> 1) rm /data/test2,txt -f
> 
> type=SYSCALL msg=audit(1616095201.302:40381): arch=c000003e syscall=263 success=yes exit=0 a0=ffffffffffffff9c a1=1b1f0c0 a2=0 a3=7fff3677a720 items=3 ppid=15954 pid=3398 auid=201327714 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=2663 comm="rm" exe="/usr/bin/rm" key="filesystem_op"
> type=CWD msg=audit(1616095201.302:40381):  cwd="/home/aevangelista"
> type=PATH msg=audit(1616095201.302:40381): item=0 name="/data/test2.txt" inode=38030531 dev=08:11 mode=0100644 ouid=0 ogid=0 rdev=00:00 objtype=NORMAL cap_fp=0000000000000000 cap_fi=0000000000000000 cap_fe=0 cap_fver=0
> type=PATH msg=audit(1616095201.302:40381): item=1 name="/data/" inode=64 dev=08:11 mode=040755 ouid=0 ogid=0 rdev=00:00 objtype=PARENT cap_fp=0000000000000000 cap_fi=0000000000000000 cap_fe=0 cap_fver=0 type=PATH msg=audit(1616095201.302:40381): item=2 name="/data/test2.txt" inode=38030531 dev=08:11 mode=0100644 ouid=0 ogid=0 rdev=00:00 objtype=DELETE cap_fp=0000000000000000 cap_fi=0000000000000000 cap_fe=0 cap_fver=0
> type=PROCTITLE msg=audit(1616095201.302:40381): proctitle=726D002D69002F646174612F74657374322E747874002D66
> 
> The proctitle value  726D002D69002F646174612F74657374322E747874002D66 is
> equal to "rm-i /data/test2.txt -f" in ASCII. Where did this -i come from?
> Is it expected?

At first, this looks like something left over from the "-i" parameter
supplied to ausearch to interpret the values in the audit records to
give you that plaintext.

But more likely, it is an alias in ~/.bashrc, ~/.bash-profile,
~/.profile, /etc/bashrc, /etc/bash.bashrc, /etc/profile,
/etc/profile.d/* that is nannying you to be sure you meant to delete
what you are asking to delete.

This can be overridden with -f.  rm(1) options preceed the filespec.

> Alan

- RGB

--
Richard Guy Briggs <rgb at redhat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635