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Add Linux namespace delegation support

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This allows ZFS datasets to be delegated to a user/mount namespace
Within that namespace, only the delegated datasets are visible
Works very similarly to Zones/Jailes on other ZFS OSes

As a user:
```
 $ unshare -Um
 $ zfs list
no datasets available
 $ echo $$
1234
```

As root:
```
 # zfs list
NAME                            ZONED  MOUNTPOINT
containers                      off    /containers
containers/host                 off    /containers/host
containers/host/child           off    /containers/host/child
containers/host/child/gchild    off    /containers/host/child/gchild
containers/unpriv               on     /unpriv
containers/unpriv/child         on     /unpriv/child
containers/unpriv/child/gchild  on     /unpriv/child/gchild

 # zfs zone /proc/1234/ns/user containers/unpriv
```

Back to the user namespace:
```
 $ zfs list
NAME                             USED  AVAIL     REFER  MOUNTPOINT
containers                       129M  47.8G       24K  /containers
containers/unpriv                128M  47.8G       24K  /unpriv
containers/unpriv/child          128M  47.8G      128M  /unpriv/child
```

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Will Andrews <will.andrews@klarasystems.com>
Signed-off-by: Allan Jude <allan@klarasystems.com>
Signed-off-by: Mateusz Piotrowski <mateusz.piotrowski@klarasystems.com>
Co-authored-by: Allan Jude <allan@klarasystems.com>
Co-authored-by: Mateusz Piotrowski <mateusz.piotrowski@klarasystems.com>
Sponsored-by: Buddy <https://buddy.works>
Closes #12263
This commit is contained in:
Will Andrews
2021-02-21 10:19:43 -06:00
committed by Brian Behlendorf
parent a1aa8f14c8
commit 4ed5e25074
33 changed files with 1166 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/os/linux/spl/sys/zone.h
+27 -4
View File
@@ -25,11 +25,34 @@
#define _SPL_ZONE_H
#include <sys/byteorder.h>
#include <sys/cred.h>
#define GLOBAL_ZONEID 0
#include <linux/cred.h>
#include <linux/user_namespace.h>
#define zone_dataset_visible(x, y) (1)
#define crgetzoneid(x) (GLOBAL_ZONEID)
#define INGLOBALZONE(z) (1)
/*
* Attach the given dataset to the given user namespace.
*/
extern int zone_dataset_attach(cred_t *, const char *, int);
/*
* Detach the given dataset from the given user namespace.
*/
extern int zone_dataset_detach(cred_t *, const char *, int);
/*
* Returns true if the named pool/dataset is visible in the current zone.
*/
extern int zone_dataset_visible(const char *dataset, int *write);
int spl_zone_init(void);
void spl_zone_fini(void);
extern unsigned int crgetzoneid(const cred_t *);
extern unsigned int global_zoneid(void);
extern boolean_t inglobalzone(proc_t *);
#define INGLOBALZONE(x) inglobalzone(x)
#define GLOBAL_ZONEID global_zoneid()
#endif /* SPL_ZONE_H */