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Date: Tue, 12 Jan 2021 11:04:46 +0100 From: Miklos Szeredi <miklos@...redi.hu> To: "Eric W. Biederman" <ebiederm@...ssion.com> Cc: Miklos Szeredi <mszeredi@...hat.com>, linux-fsdevel@...r.kernel.org, overlayfs <linux-unionfs@...r.kernel.org>, LSM <linux-security-module@...r.kernel.org>, linux-kernel@...r.kernel.org, "Serge E. Hallyn" <serge@...lyn.com> Subject: Re: [PATCH v2 01/10] vfs: move cap_convert_nscap() call into vfs_setxattr() On Tue, Jan 12, 2021 at 10:43 AM Miklos Szeredi <miklos@...redi.hu> wrote: > The following semantics would make a ton more sense, since getting a > v2 would indicate that rootid is unknown: > > - if cap is v2 convert to v3 with zero rootid > - after this, check if rootid needs to be translated, if not return v3 > - if yes, try to translate to current ns, if succeeds return translated v3 > - if not mappable, return v2 > > Hmm? Actually, it would make even more sense to simply skip unconvertible caps and return -ENODATA. In fact that's what I thought would happen until I looked at the -EOPNOTSUPP fallback code in vfs_getxattr(). Serge, do you remember what was the reason for the unconverted fallback? Thanks, Miklos
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