Public bug reported:
On 26.04, with:
apparmor 5.0.0~beta1-0ubuntu2
linux-image-6.19.0-6-generic 6.19.0-6.6
netcat-openbsd 1.234-1
netcat does not seem to work. It connects, but nothing goes through.
To reproduce the issue try to run in two different shell:
nc -l 8080
nc localhost 8080
Audit will show:
audit: type=1400 audit(1772551803.866:293): apparmor="DENIED"
operation="file_perm" class="net" profile="nc.openbsd" pid=8567
comm="nc" laddr=127.0.0.1 lport=34768 faddr=127.0.0.1 fport=8080
family="inet" sock_type="stream" protocol=6 requested="receive"
denied="receive"
and
audit: type=1400 audit(1772551795.477:291): apparmor="DENIED"
operation="file_perm" class="net" profile="nc.openbsd" pid=8543
comm="nc" laddr=127.0.0.1 lport=8080 faddr=127.0.0.1 fport=34768
family="inet" sock_type="stream" protocol=6 requested="send"
denied="send"
** Affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2143151
Title:
apparmor profile for nc.openbsd does not allow send/receive
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