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Cross-platform xattr user namespace compatibility
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ZFS on Linux originally implemented xattr namespaces in a way that is
incompatible with other operating systems.  On illumos, xattrs do not
have namespaces.  Every xattr name is visible.  FreeBSD has two
universally defined namespaces: EXTATTR_NAMESPACE_USER and
EXTATTR_NAMESPACE_SYSTEM.  The system namespace is used for protected
FreeBSD-specific attributes such as MAC labels and pnfs state.  These
attributes have the namespace string "freebsd:system:" prefixed to the
name in the encoding scheme used by ZFS.  The user namespace is used
for general purpose user attributes and obeys normal access control
mechanisms.  These attributes have no namespace string prefixed, so
xattrs written on illumos are accessible in the user namespace on
FreeBSD, and xattrs written to the user namespace on FreeBSD are
accessible by the same name on illumos.

Linux has several xattr namespaces.  On Linux, ZFS encodes the
namespace in the xattr name for every namespace, including the user
namespace.  As a consequence, an xattr in the user namespace with the
name "foo" is stored by ZFS with the name "user.foo" and therefore
appears on FreeBSD and illumos to have the name "user.foo" rather than
"foo".  Conversely, none of the xattrs written on FreeBSD or illumos
are accessible on Linux unless the name happens to be prefixed with one
of the Linux xattr namespaces, in which case the namespace is stripped
from the name.  This makes xattrs entirely incompatible between Linux
and other platforms.

We want to make the encoding of user namespace xattrs compatible across
platforms.  A critical requirement of this compatibility is for xattrs
from existing pools from FreeBSD and illumos to be accessible by the
same names in the user namespace on Linux.  It is also necessary that
existing pools with xattrs written by Linux retain access to those
xattrs by the same names on Linux.  Making user namespace xattrs from
Linux accessible by the correct names on other platforms is important.
The handling of other namespaces is not required to be consistent.

Add a fallback mechanism for listing and getting xattrs to treat xattrs
as being in the user namespace if they do not match a known prefix.

When setting user namespace xattrs, do not prefix the namespace to the
name.  If the xattr is already present with the namespace prefix,
remove it so only the non-prefixed version persists.  This ensures
other platforms will be able to read the xattr with the correct name.

Do not allow setting or getting xattrs with a name that is prefixed
with one of the namespace names used by ZFS on supported platforms.

Allow choosing between cross-platform compatability and legacy Linux
compatibility with a per-dataset property.  This facilitates
replication between hosts with different compatibility needs.

Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
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Ryan Moeller authored and Ryan Moeller committed Feb 2, 2022
1 parent 15aa386 commit 84be4e2
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Showing 18 changed files with 674 additions and 305 deletions.
4 changes: 3 additions & 1 deletion include/os/freebsd/zfs/sys/zfs_vfsops_os.h
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Original file line number Diff line number Diff line change
Expand Up @@ -239,7 +239,9 @@ struct zfsvfs {
RW_WRITE_HELD(&(zfsvfs)->z_teardown_inactive_lock)
#endif

#define ZSB_XATTR 0x0001 /* Enable user xattrs */
#define ZSB_XATTR 0x0001 /* Enable user xattrs */
#define ZSB_XATTR_COMPAT 0x0002 /* Enable cross-platform user xattrs */

/*
* Normal filesystems (those not under .zfs/snapshot) have a total
* file ID size limited to 12 bytes (including the length field) due to
Expand Down
3 changes: 2 additions & 1 deletion include/os/linux/zfs/sys/zfs_vfsops_os.h
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Original file line number Diff line number Diff line change
Expand Up @@ -170,7 +170,8 @@ struct zfsvfs {
#define ZFS_TEARDOWN_HELD(zfsvfs) \
RRM_LOCK_HELD(&(zfsvfs)->z_teardown_lock)

#define ZSB_XATTR 0x0001 /* Enable user xattrs */
#define ZSB_XATTR 0x0001 /* Enable user xattrs */
#define ZSB_XATTR_COMPAT 0x0002 /* Enable cross-platform user xattrs */

/*
* Allow a maximum number of links. While ZFS does not internally limit
Expand Down
37 changes: 35 additions & 2 deletions include/sys/fs/zfs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -187,6 +187,7 @@ typedef enum {
ZFS_PROP_IVSET_GUID, /* not exposed to the user */
ZFS_PROP_REDACTED,
ZFS_PROP_REDACT_SNAPS,
ZFS_PROP_XATTR_COMPAT,
ZFS_NUM_PROPS
} zfs_prop_t;

Expand Down Expand Up @@ -532,6 +533,11 @@ typedef enum zfs_key_location {
#define DEFAULT_PBKDF2_ITERATIONS 350000
#define MIN_PBKDF2_ITERATIONS 100000

typedef enum zfs_xattr_compat {
ZFS_XATTR_COMPAT_LINUX = 0,
ZFS_XATTR_COMPAT_ALL,
} zfs_xattr_compat_t;

/*
* On-disk version number.
*/
Expand Down Expand Up @@ -1708,7 +1714,6 @@ typedef enum {
#define ZFS_EV_HIST_DSID "history_dsid"
#define ZFS_EV_RESILVER_TYPE "resilver_type"


/*
* We currently support block sizes from 512 bytes to 16MB.
* The benefits of larger blocks, and thus larger IO, need to be weighed
Expand All @@ -1730,7 +1735,6 @@ typedef enum {
#define SPA_OLD_MAXBLOCKSIZE (1ULL << SPA_OLD_MAXBLOCKSHIFT)
#define SPA_MAXBLOCKSIZE (1ULL << SPA_MAXBLOCKSHIFT)


/* supported encryption algorithms */
enum zio_encrypt {
ZIO_CRYPT_INHERIT = 0,
Expand All @@ -1748,6 +1752,35 @@ enum zio_encrypt {
#define ZIO_CRYPT_ON_VALUE ZIO_CRYPT_AES_256_GCM
#define ZIO_CRYPT_DEFAULT ZIO_CRYPT_OFF

/*
* xattr namespace prefixes. These are forbidden in xattr names.
*
* For cross-platform compatibility, xattrs in the user namespace should not be
* prefixed with the namespace name, but for backwards compatibility with older
* ZFS on Linux versions we do prefix the namespace.
*/
#define ZFS_XA_NS_FREEBSD_PREFIX "freebsd:"
#define ZFS_XA_NS_FREEBSD_PREFIX_LEN strlen("freebsd:")
#define ZFS_XA_NS_LINUX_SECURITY_PREFIX "security."
#define ZFS_XA_NS_LINUX_SECURITY_PREFIX_LEN strlen("security.")
#define ZFS_XA_NS_LINUX_SYSTEM_PREFIX "system."
#define ZFS_XA_NS_LINUX_SYSTEM_PREFIX_LEN strlen("system.")
#define ZFS_XA_NS_LINUX_TRUSTED_PREFIX "trusted."
#define ZFS_XA_NS_LINUX_TRUSTED_PREFIX_LEN strlen("trusted.")
#define ZFS_XA_NS_LINUX_USER_PREFIX "user."
#define ZFS_XA_NS_LINUX_USER_PREFIX_LEN strlen("user.")

/* BEGIN CSTYLED */
#define ZFS_XA_NS_PREFIX_MATCH(ns, name) \
(strncmp(name, ZFS_XA_NS_##ns##_PREFIX, ZFS_XA_NS_##ns##_PREFIX_LEN) == 0)

#define ZFS_XA_NS_PREFIX_FORBIDDEN(name) \
(ZFS_XA_NS_PREFIX_MATCH(FREEBSD, name) || \
ZFS_XA_NS_PREFIX_MATCH(LINUX_SECURITY, name) || \
ZFS_XA_NS_PREFIX_MATCH(LINUX_SYSTEM, name) || \
ZFS_XA_NS_PREFIX_MATCH(LINUX_TRUSTED, name) || \
ZFS_XA_NS_PREFIX_MATCH(LINUX_USER, name))
/* END CSTYLED */

#ifdef __cplusplus
}
Expand Down
155 changes: 75 additions & 80 deletions lib/libuutil/libuutil.abi
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,6 @@
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Expand Down Expand Up @@ -855,6 +853,9 @@
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Expand Down Expand Up @@ -889,18 +890,66 @@
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Expand Down Expand Up @@ -969,16 +1018,16 @@
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Expand All @@ -990,65 +1039,6 @@
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Expand All @@ -1059,11 +1049,16 @@
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Expand Down Expand Up @@ -1119,6 +1114,7 @@
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Expand Down Expand Up @@ -1151,7 +1147,6 @@
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Expand Down Expand Up @@ -1304,15 +1299,6 @@
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Expand All @@ -1339,6 +1325,15 @@
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Expand Down
3 changes: 2 additions & 1 deletion lib/libzfs/libzfs.abi
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3513,7 +3513,8 @@
<enumerator name='ZFS_PROP_IVSET_GUID' value='92'/>
<enumerator name='ZFS_PROP_REDACTED' value='93'/>
<enumerator name='ZFS_PROP_REDACT_SNAPS' value='94'/>
<enumerator name='ZFS_NUM_PROPS' value='95'/>
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<enum-decl name='zfs_userquota_prop_t' naming-typedef-id='279fde6a' id='5258d2f6'>
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