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15 Commits
Author SHA1 Message Date
Jamie LiuandgVisor bot 114d68adb8 Support VFS2 save/restore. 
Inode number consistency checks are now skipped in save/restore tests for
reasons described in greatest detail in StatTest.StateDoesntChangeAfterRename.
They pass in VFS1 due to the bug described in new test case
SimpleStatTest.DifferentFilesHaveDifferentDeviceInodeNumberPairs.

Fixes #1663

PiperOrigin-RevId: 338776148
 2020-10-23 17:48:33 -07:00
Dean DengandgVisor bot 5fd9ec997d [vfs2] Don't take reference in Task.MountNamespaceVFS2 and MountNamespace.Root. 
This fixes reference leaks related to accidentally forgetting to DecRef()
after calling one or the other.

PiperOrigin-RevId: 336918922
 2020-10-13 11:31:22 -07:00
Dean DengandgVisor bot 14bab61090 [vfs2] Add FilesystemType.Release to avoid reference leaks. 
Singleton filesystem like devpts and devtmpfs have a single filesystem shared
among all mounts, so they acquire a "self-reference" when initialized that
must be released when the entire virtual filesystem is released at sandbox
exit.

PiperOrigin-RevId: 336828852
 2020-10-13 01:13:22 -07:00
Adin ScannellandgVisor bot 75df87e081 Add basic stateify annotations. 
Updates #1663

PiperOrigin-RevId: 333539293
 2020-09-24 10:13:04 -07:00
Fabricio VoznikaandgVisor bot 9e0c895aeb Honor readonly flag for root mount 
Updates #1487

PiperOrigin-RevId: 330580699
 2020-09-08 14:00:43 -07:00
Nicolas LacasseandgVisor bot 5926f09927 Make mounts ReadWrite first, then later change to ReadOnly. 
This lets us create "synthetic" mountpoint directories in ReadOnly mounts
during VFS setup.

Also add context.WithMountNamespace, as some filesystems (like overlay) require
a MountNamespace on ctx to handle vfs.Filesystem Operations.

PiperOrigin-RevId: 327874971
 2020-08-21 14:30:03 -07:00
Nicolas LacasseandgVisor bot 5bfdceb584 Fix parent directory creation in CreateDeviceFile. 
It was not properly creating recursive directories. Added tests for this case.

Updates #1196

PiperOrigin-RevId: 327850811
 2020-08-21 12:10:14 -07:00
Nayana BidariandgVisor bot 4a8d0d3f20 Plumbing context.Context to DecRef() and Release(). 
context is passed to DecRef() and Release() which is
needed for SO_LINGER implementation.

PiperOrigin-RevId: 324672584
 2020-08-03 13:36:05 -07:00
Nicolas LacasseandgVisor bot ed24eb37ee Port /dev/net/tun device to VFS2. 
Updates #2912 #1035

PiperOrigin-RevId: 318162565
 2020-06-24 16:23:44 -07:00
Nicolas LacasseandgVisor bot 1f25136e20 Port devpts to VFS2. 
PiperOrigin-RevId: 308164359
 2020-04-23 17:34:29 -07:00
Nicolas LacasseandgVisor bot 899421a0e7 Add FilesystemType.Name method, and FilesystemType field to Filesystem struct. 
Both have analogues in Linux:
* struct file_system_type has a char *name field.
* struct super_block keeps a pointer to the file_system_type.

These fields are necessary to support the `filesystem type` field in
/proc/[pid]/mountinfo.

PiperOrigin-RevId: 303434063
 2020-03-27 16:56:16 -07:00
gVisor bot 973cc2db84 Inline vfs.VirtualFilesystem in Kernel struct 
This saves one pointer dereference per VFS access.

Updates #1623

PiperOrigin-RevId: 295216176
 2020-02-14 13:40:39 -08:00
gVisor bot 649b11f624 Plumb VFS2 inside the Sentry 
- Added fsbridge package with interface that can be used to open
  and read from VFS1 and VFS2 files.
- Converted ELF loader to use fsbridge
- Added VFS2 types to FSContext
- Added vfs.MountNamespace to ThreadGroup

Updates #1623

PiperOrigin-RevId: 295183950
 2020-02-14 11:12:47 -08:00
Fabricio VoznikaandgVisor bot 0bc53075f9 Remove argument from vfs.MountNamespace.DecRef() 
Updates #1035

PiperOrigin-RevId: 293194631
 2020-02-04 11:48:36 -08:00
Jamie LiuandgVisor bot 07ec260f9a Add //pkg/sentry/fsimpl/devtmpfs. 
PiperOrigin-RevId: 292021389
 2020-01-28 15:05:24 -08:00