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Message-ID: <5de0ae69-5e3d-2ccb-64a3-971db66477f8@redhat.com>
Date: Thu, 17 Nov 2022 16:03:35 +0800
From: Xiubo Li <xiubli@...hat.com>
To: Luís Henriques <lhenriques@...e.de>,
Ilya Dryomov <idryomov@...il.com>,
Jeff Layton <jlayton@...nel.org>
Cc: ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ceph: make sure directories aren't complete after setting
crypt context
On 16/11/2022 23:37, Luís Henriques wrote:
> When setting a directory's crypt context, __ceph_dir_clear_complete() needs
> to be used otherwise, if it was complete before, any old dentry that's still
> around will be valid.
>
> Signed-off-by: Luís Henriques <lhenriques@...e.de>
> ---
> Hi!
>
> Here's a simple way to trigger the bug this patch is fixing:
>
> # cd /cephfs
> # ls mydir
> nKRhofOAVNsAwVLvDw7a0c9ypsjbZfK3n0Npnmni6j0
> # ls mydir/nKRhofOAVNsAwVLvDw7a0c9ypsjbZfK3n0Npnmni6j0/
> Cyuer5xT+kBlEPgtwAqSj0WK2taEljP5vHZ,D8VXCJ8 u+46b2XVCt7Obpz0gznZyNLRj79Q2l4KmkwbKOzdQKw
> # fscrypt unlock mydir
> # touch /mnt/test/mydir/mysubdir/file
> touch: cannot touch '/mnt/test/mydir/mysubdir/file': No such file or directory
>
> fs/ceph/crypto.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c
> index 35a2ccfe6899..dc1557967032 100644
> --- a/fs/ceph/crypto.c
> +++ b/fs/ceph/crypto.c
> @@ -87,6 +87,10 @@ static int ceph_crypt_get_context(struct inode *inode, void *ctx, size_t len)
> return -ERANGE;
>
> memcpy(ctx, cfa->cfa_blob, ctxlen);
> +
> + /* Directory isn't complete anymore */
> + if (S_ISDIR(inode->i_mode) && __ceph_dir_is_complete(ci))
> + __ceph_dir_clear_complete(ci);
Hi Luis,
Good catch!
BTW, why do this in the ceph_crypt_get_context() ? As my understanding
is that we should mark 'mydir' as incomplete when unlocking it. While as
I remembered the unlock operation will do:
Step1: get_encpolicy via 'mydir' as ctx
Step2: rm_enckey of ctx from the superblock
Since I am still running the test cases for the file lock patches, so I
didn't catch logs to confirm the above steps yet.
If I am right IMO then we should mark the dir as incomplete in the Step2
instead, because for non-unlock operations they may also do the Step1.
Thanks!
- Xiubo
> return ctxlen;
> }
>
>
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