I configured /etc/security/limits.conf like this.
user1 soft core 0
user1 hard core 0
Then, I rebooted the system and logged in as root then I did this.
su user1
ulimit -c unlimited
then I executed a buggy application to generate core file. since I set the core limit to zero from limits.conf, I expected the core will not be generated but, that was not the result, the core was normally generated. what's wrong??
some advice would be appreciated.
limits.conf is read by pam_limits.so, so you need to check that this module is enabled in /etc/pam.d/su. On my system, this was commented out by default:
# Sets up user limits, please uncomment and read /etc/security/limits.conf
# to enable this functionality.
# (Replaces the use of /etc/limits in old login)
# session required pam_limits.so
Once uncommented, the module will start working immediately. If you still have problems, check your auth log (maybe /var/log/auth.log), which is where limits-related errors will be written.