-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 11/01/2013 01:02 PM, Stephen Smalley wrote: > On 11/01/2013 01:00 PM, Carlos O'Donell wrote: >> On 11/01/2013 12:00 PM, Stephen Smalley wrote: >>> But selinux_check_access() is IMHO a better way to go for any new code >>> unless it is so performance-critical that the context, class, and perm >>> lookups per check are prohibitive. >> >> The code in question is from glibc's nscd and used when determining if >> the user should or should not have access to specific cache results, and >> therefore it is performance sensitive. The faster we can determine if >> access is allowed the faster we can return a result to a client that >> needs an answer about a particular credential. I'm happing doing the >> translations at startup when the daemon is initializing, but I'm not >> happy to do them at every request arriving to the daemon. Unless someone >> says this needs to be fully dynamic I'd like to avoid any costs during >> the request handling phase. > > I doubt the overhead of the SID/class/perm lookup compares to the IPC > overhead, but I can't say that I've measured it. But feel free to use > whichever interface you prefer. > > > > > -- This message was distributed to subscribers of the selinux mailing > list. If you no longer wish to subscribe, send mail to > majordomo@xxxxxxxxxxxxx with the words "unsubscribe selinux" without quotes > as the message. > We could potentially optimize the calls similarly to what we did with procattr, where we cache the previous lookup. Since the source,type,class,perm flags will often be repeated. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.15 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlJ0G2wACgkQrlYvE4MpobM5twCeN14XzW+AaRpnMHf58EAETeuu IVYAoOmXkl9dIh4ARQjQDkl3JIH1WUnj =5ZEm -----END PGP SIGNATURE----- -- This message was distributed to subscribers of the selinux mailing list. If you no longer wish to subscribe, send mail to majordomo@xxxxxxxxxxxxx with the words "unsubscribe selinux" without quotes as the message.
