Messages in this thread | | | From | (Eric W. Biederman) | Subject | Re: [PATCH -mm 5/7] add user namespace | Date | Thu, 13 Jul 2006 21:50:17 -0600 |
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"Serge E. Hallyn" <serue@us.ibm.com> writes:
> Quoting Eric W. Biederman (ebiederm@xmission.com): >> >> keys are essentially security credentials for something besides the >> >> local kernel. Think kerberos tickets. That makes the keys the >> >> obvious place to say what uid you are in a different user namespace >> >> and similar things. >> > >> > what about performance ? wouldn't that slow the checking ? >> >> It needs to be looked at, but it shouldn't slow the same namespace >> case, > > How so? The processesing is the same.
If you do mapping of uids that would not trigger if you have matching user namespaces.
>> and permission checking is largely a slow path issue. So a little >> overhead at open time is preferred to overhead after you get the file >> open. > > Unsure which approach has overhead after file open...
I don't know that I have seen that one yet. Sorry this was generally a statement of principle.
Eric
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