Hi,
I would like to know, how much risk is there
setting allow_domain_fd_use to 1?
I am not totally sure about the security impact. Would that allow a process in one
domain to read files and sockets that have been opened by a another domain?
Usually, I disable it, but from time to time I get error messages like:
- type=AVC msg=audit(1381801383.801:31585): avc: denied { use } for pid=25761 comm="mail" path="/dev/null" dev=devtmpfs ino=3656 scontext=system_u:system_r:logrotate_mail_t:s0-s0:c0.c1023 tcontext=system_u:system_r:system_cronjob_t:s0-s0:c0.c1023 tclass=fd
type=AVC msg=audit(1381801383.801:31585): avc: denied { use } for pid=25761 comm="mail" path="/dev/null" dev=devtmpfs ino=3656 scontext=system_u:system_r:logrotate_mail_t:s0-s0:c0.c1023 tcontext=system_u:system_r:system_cronjob_t:s0-s0:c0.c1023 tclass=fd
type=SYSCALL msg=audit(1381801383.801:31585): arch=x86_64 syscall=execve success=yes exit=0 a0=229fcd0 a1=229fd50 a2=229df90 a3=7fffb994eef0 items=0 ppid=25741 pid=25761 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=1677 comm=mail exe=/bin/mailx subj=system_u:system_r:logrotate_mail_t:s0-s0:c0.c1023 key=(null)
On a hypervisor, I have to allow it, otherwise I get millions of messages like
type=SYSCALL msg=audit(1381823069.947:3240474): arch=c000003e syscall=0 success=no exit=-13 a0=17 a1=7f9045c99ae4 a2=11000 a3=7fffa277af30 items=0 ppid=1 pid=9616 auid=4294967295 uid=107 gid=107 euid=107 suid=107 fsuid=107 egid=107 sgid=107 fsgid=107 tty=(none) ses=4294967295 comm="qemu-kvm" exe=2F7573722F6C6962657865632F71656D752D6B766D202864656C6574656429 subj=system_u:system_r:svirt_t:s0:c559,c791 key=(null)
type=AVC msg=audit(1381823069.947:3240474): avc: denied { use } for pid=9616 comm="qemu-kvm" path="/dev/net/tun" dev=devtmpfs ino=9274 scontext=system_u:system_r:svirt_t:s0:c559,c791 tcontext=system_u:system_r:virtd_t:s0-s0:c0.c1023 tclass=fd
Regards
Tim
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