Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
To:     David Howells <dhowells@redhat.com>, torvalds@linux-foundation.org,
        viro@zeniv.linux.org.uk
Cc:     Aleksa Sarai <cyphar@cyphar.com>, raven@themaw.net,
        mszeredi@redhat.com, christian@brauner.io, jannh@google.com,
        darrick.wong@oracle.com, kzak@redhat.com, jlayton@redhat.com,
        linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org
References: <158376244589.344135.12925590041630631412.stgit@warthog.procyon.org.uk>
 <158376245699.344135.7522994074747336376.stgit@warthog.procyon.org.uk>
From:   Stefan Metzmacher <metze@samba.org>
Autocrypt: addr=metze@samba.org; prefer-encrypt=mutual; keydata=
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Subject: Re: [PATCH 01/14] VFS: Add additional RESOLVE_* flags [ver #18]
Message-ID: <a2012ba2-e322-39e2-fa80-c8d4aef501de@samba.org>
Date:   Mon, 9 Mar 2020 21:56:18 +0100
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From: Stefan Metzmacher <metze@samba.org>
To: David Howells <dhowells@redhat.com>, torvalds@linux-foundation.org,
 viro@zeniv.linux.org.uk
Cc: Aleksa Sarai <cyphar@cyphar.com>, raven@themaw.net, mszeredi@redhat.com,
 christian@brauner.io, jannh@google.com, darrick.wong@oracle.com,
 kzak@redhat.com, jlayton@redhat.com, linux-api@vger.kernel.org,
 linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org,
 linux-kernel@vger.kernel.org
Message-ID: <a2012ba2-e322-39e2-fa80-c8d4aef501de@samba.org>
Subject: Re: [PATCH 01/14] VFS: Add additional RESOLVE_* flags [ver #18]
References: <158376244589.344135.12925590041630631412.stgit@warthog.procyon.org.uk>
 <158376245699.344135.7522994074747336376.stgit@warthog.procyon.org.uk>
In-Reply-To: <158376245699.344135.7522994074747336376.stgit@warthog.procyon.org.uk>

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Hi David,

> Add additional RESOLVE_* flags to correspond to AT_* flags that aren't
> currently implemented:
>=20
> 	RESOLVE_NO_TRAILING_SYMLINKS    for AT_SYMLINK_NOFOLLOW
> 	RESOLVE_NO_TRAILING_AUTOMOUNTS  for AT_NO_AUTOMOUNT
> 	RESOLVE_EMPTY_PATH              for AT_EMPTY_PATH

Thanks for changing the names!

> This is necessary for fsinfo() to use RESOLVE_* flags instead of AT_* f=
lags
> if the latter are to be considered deprecated for new system calls.
>=20
> Also make openat2() handle RESOLVE_NO_TRAILING_SYMLINKS.
>=20
> Automounting is currently forced by doing an open(), so adding support =
to
> openat2() for RESOLVE_NO_TRAILING_AUTOMOUNTS is not trivial.

lookup_flags &=3D ~LOOKUP_AUTOMOUNT won't work?

At least it should cause EINVAL (or something similar) instead of being
silently ignored. The same applies to RESOLVE_EMPTY_PATH, it should be
handled with some logic or also cause EINVAL.

vfs_statx()/vfs_stat_set_lookup_flags() seems to have a similar logic
using the AT_* flags.

metze


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