From: Eric Biggers <ebiggers@kernel.org>
To: Richard Weinberger <richard.weinberger@gmail.com>
Cc: linux-ext4@vger.kernel.org,
"open list:ABI/API" <linux-api@vger.kernel.org>,
linux-f2fs-devel@lists.sourceforge.net,
linux-fscrypt@vger.kernel.org, keyrings@vger.kernel.org,
linux-mtd@lists.infradead.org, linux-crypto@vger.kernel.org,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Satya Tangirala <satyat@google.com>,
Paul Crowley <paulcrowley@google.com>
Subject: Re: [RFC PATCH v3 07/18] fscrypt: add FS_IOC_ADD_ENCRYPTION_KEY ioctl
Date: Wed, 20 Feb 2019 21:49:39 -0800 [thread overview]
Message-ID: <20190221054938.GA12467@sol.localdomain> (raw)
In-Reply-To: <CAFLxGvy7WsV7Qo42yTbsZf9YnW563a0k6Yx2-NmASNtoektu_Q@mail.gmail.com>
Hi Richard,
On Thu, Feb 21, 2019 at 12:52:38AM +0100, Richard Weinberger wrote:
> On Wed, Feb 20, 2019 at 7:55 AM Eric Biggers <ebiggers@kernel.org> wrote:
> > +#define FSCRYPT_FS_KEYRING_DESCRIPTION_SIZE \
> > + (CONST_STRLEN("fscrypt-") + FIELD_SIZEOF(struct super_block, s_id))
> > +
> > +#define FSCRYPT_MK_DESCRIPTION_SIZE (2 * FSCRYPT_KEY_DESCRIPTOR_SIZE + 1)
> > +
> > +static void format_fs_keyring_description(
> > + char description[FSCRYPT_FS_KEYRING_DESCRIPTION_SIZE],
> > + const struct super_block *sb)
> > +{
> > + sprintf(description, "fscrypt-%s", sb->s_id);
> > +}
>
> I fear ->s_id is not the right thing.
> For filesystems such as ext4 ->s_id is the name of the backing block device,
> so it is per filesysem instance unique.
> But this is not guaranteed. For UBIFS ->s_id is just "ubifs", always.
> So the names will clash.
>
> --
> Thanks,
> //richard
What name do you suggest using for UBIFS filesystems? The keyring name could be
set by the filesystem via a fscrypt_operations callback if needed.
Note that the keyring name isn't particularly important, since the ioctls will
work regardless. But we might as well choose something logical, since the
keyring name will still show up in /proc/keys.
- Eric
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next prev parent reply other threads:[~2019-02-21 5:49 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-20 6:52 [RFC PATCH v3 00/18] fscrypt: key management improvements Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 01/18] fs, fscrypt: move uapi definitions to new header <linux/fscrypt.h> Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 02/18] fscrypt: use FSCRYPT_ prefix for uapi constants Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 03/18] fscrypt: use FSCRYPT_* definitions, not FS_* Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 04/18] fs: add ->s_master_keys to struct super_block Eric Biggers
2019-02-20 23:19 ` Richard Weinberger
2019-02-20 6:52 ` [RFC PATCH v3 05/18] fscrypt: add ->ci_inode to fscrypt_info Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 06/18] fscrypt: refactor v1 policy key setup into keysetup_legacy.c Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 07/18] fscrypt: add FS_IOC_ADD_ENCRYPTION_KEY ioctl Eric Biggers
2019-02-20 23:52 ` Richard Weinberger
2019-02-21 5:49 ` Eric Biggers [this message]
2019-02-21 9:33 ` Richard Weinberger
2019-02-21 18:42 ` Eric Biggers
2019-03-18 23:08 ` Eric Biggers
2019-03-22 22:02 ` Richard Weinberger
2019-02-20 6:52 ` [RFC PATCH v3 08/18] fs/dcache.c: add shrink_dcache_inode() Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 09/18] fscrypt: add FS_IOC_REMOVE_ENCRYPTION_KEY ioctl Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 10/18] fscrypt: add FS_IOC_GET_ENCRYPTION_KEY_STATUS ioctl Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 11/18] fscrypt: add an HKDF-SHA512 implementation Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 12/18] fscrypt: v2 encryption policy support Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 13/18] fscrypt: allow unprivileged users to add/remove keys for v2 policies Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 14/18] fscrypt: require that key be added when setting a v2 encryption policy Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 15/18] ext4: wire up new fscrypt ioctls Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 16/18] f2fs: " Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 17/18] ubifs: " Eric Biggers
2019-02-20 6:52 ` [RFC PATCH v3 18/18] fscrypt: document the new ioctls and policy version Eric Biggers
2019-02-20 7:18 ` [RFC PATCH v3 00/18] fscrypt: key management improvements Andreas Dilger
2019-02-20 7:54 ` Eric Biggers
2019-02-20 18:07 ` David Howells
2019-02-20 18:36 ` Eric Biggers
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