As I can see on my installation the following happens:
requested_mask="r::" denied_mask="r::"
but
virt-aa-helper.c:
865 for (i = 0; i < ctl->def->nserials; i++)
866 if (ctl->def->serials[i] &&
ctl->def->serials[i]->data.file.path)
867 if (vah_add_file(&buf,
868 ctl->def->serials[i]->data.file.path, "w")
!= 0)
869 goto clean;
870
871 if (ctl->def->console && ctl->def->console->data.file.path)
872 if (vah_add_file(&buf, ctl->def->console->data.file.path, "w")
!= 0)
873 goto clean;
so apparmor profiles contain e.g. /dev/ttyS0 w, which allows writing to
the file, but not reading :-/
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https://bugs.launchpad.net/bugs/578527
Title:
map serial port throws "chardev: opening backend "tty" failed"
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