I was able to reproduce the problem, but only using the flash plugin:
Jan 31 23:38:34 tigreraye kernel: [221147.141240] audit: type=1400
audit(1485902314.881:3406): apparmor="DENIED" operation="mknod"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/dev/shm/org.chromium.CvbXEt" pid=11592 comm="plugin-containe"
requested_mask="c" denied_mask="c" fsuid=1000 ouid=1000
Jan 31 23:38:34 tigreraye kernel: [221147.141263] audit: type=1400
audit(1485902314.881:3407): apparmor="DENIED" operation="mknod"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/dev/shm/org.chromium.5Am9iK" pid=11592 comm="plugin-containe"
requested_mask="c" denied_mask="c" fsuid=1000 ouid=1000
I also tried the java plugin, but it does not use /dev/shm (it fails,
but for another reason):
Jan 31 23:43:49 tigreraye kernel: [221461.300441] audit: type=1400
audit(1485902629.062:6116995): apparmor="DENIED" operation="exec"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/usr/lib/jvm/java-8-oracle/jre/bin/java" pid=11779 comm="plugin-containe"
requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
Jan 31 23:43:49 tigreraye kernel: [221461.301683] audit: type=1400
audit(1485902629.062:6116996): apparmor="DENIED" operation="exec"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/usr/lib/jvm/java-8-oracle/jre/bin/java" pid=11780 comm="plugin-containe"
requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1495248
Title:
usr.bin.firefox blocks /dev/shm
Status in firefox package in Ubuntu:
Confirmed
Bug description:
When apparmor is activated for Firefox, I get the following log
messages:
[28547.841769] audit: type=1400 audit(1442154214.608:109): apparmor="DENIED"
operation="mknod" profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/dev/shm/shmfd-mSnoHU" pid=7425 comm
="firefox" requested_mask="c" denied_mask="c" fsuid=1111 ouid=1111
Both /run/shm/shmfd-* and /var/run/shm/shmfd-* are allowed, but not
/dev/shm/shmfd-*.
Changing :
owner /{,var/}run/shm/shmfd-* rw,
To:
owner /{dev,{,var/}run}/shm/shmfd-* rw,
seems to fix the issue.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1495248/+subscriptions
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