Commit Graph

38263 Commits

Author SHA1 Message Date
Linus Torvalds 9272f2dc39 Merge branch 'for-linus' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs/smb3 updates from Steve French:
 "Improved SMB3 support (symlink and device emulation, and remapping by
  default the 7 reserved posix characters) and a workaround for cifs
  mounts to Mac (working around a commonly encountered Mac server bug)"

* 'for-linus' of git://git.samba.org/sfrench/cifs-2.6:
  [CIFS] Remove obsolete comment
  Check minimum response length on query_network_interface
  Workaround Mac server problem
  Remap reserved posix characters by default (part 3/3)
  Allow conversion of characters in Mac remap range (part 2)
  Allow conversion of characters in Mac remap range. Part 1
  mfsymlinks support for SMB2.1/SMB3. Part 2 query symlink
  Add mfsymlinks support for SMB2.1/SMB3. Part 1 create symlink
  Allow mknod and mkfifo on SMB2/SMB3 mounts
  add defines for two new file attributes
2014-10-18 13:39:19 -07:00
Linus Torvalds e83e432372 dlm for 3.18
This includes a single commit fixing a missing endian conversion.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJUQT+qAAoJEDgbc8f8gGmqT1wQAMjq4O0wh0DNI08SrHHszwnI
 e5btCmlMfNIvSfKmNcwstEJH5R86qi+8Q7fAKPj73XXlb1HLYjhQltuuysRSlmZE
 Ll+eqnOWVJPxlFjyRDKzO7HxejMsqEE29gtmzw9iL43F2M1acmCMgrVLz8VJGHH2
 21hK9eo9L51kLVXK2+rSexdJJNDVjuy9N25J1d/r9/9UEIp+gGhD5ZMpBlDmw1md
 VJgbL/yv99mjicjVnd5nZE7fhcWFPPV5IyeyUQS0Pg92cAYZUNBBAzta3yU4ira4
 tJU4V2k3zoK40TXqRnGNFgFNvm8cfzNUX+9HtWyWmr6VySfRVXFhSDcHa2/NQva9
 4T1vVO5Dg/4+ELIdtaGMEv+B5KCv9/hWjmhnlLBIJktJdH+1NmRXjZAg6gM51XRB
 ZwQIf929lELeqGTdfJyO4bR/NPcjrEnEpQFBBAuypko06ZJhXLJZqtKD/3o5lCjX
 VOgPkuNtylPARdUo/m1EffF4Rm1LREcbMHDMUInaVt6qAeHRqq8QkvBhBQ7VzFX1
 Y1dwGWh8m9pA3q48j2GIT1rWbl5Fue8f34RMnn4psRVM0rnQ8WHh3/p5wsSsXlib
 BCX5ez5O2aF7pe4Lqj3NkGmyB6PvICRbU2ZEe2uPbvMZnoq0NouO4asCLSeycu52
 fYlz9mZ3e+Y+sv2JN3vG
 =eEi+
 -----END PGP SIGNATURE-----

Merge tag 'dlm-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm

Pull dlm fix from David Teigland:
 "This includes a single commit fixing a missing endian conversion"

* tag 'dlm-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm:
  dlm: fix missing endian conversion of rcom_status flags
2014-10-18 13:37:19 -07:00
Linus Torvalds ef161ea1ff Merge branch 'for-linus-update' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs data corruption fix from Chris Mason:
 "I'm testing a pull with more fixes, but wanted to get this one out so
  Greg can pick it up.

  The corruption isn't easy to hit, you have to do a readonly snapshot
  and have orphans in the snapshot.  But my review and testing missed
  the bug.  Filipe has added a better xfstest to cover it"

* 'for-linus-update' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Revert "Btrfs: race free update of commit root for ro snapshots"
2014-10-18 13:32:17 -07:00
Linus Torvalds 8ccf863f09 ensure unique filenames in pstore
-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJUP/b6AAoJEKurIx+X31iBnikP/3yUNHty6FpLJ/u0liqnzBIP
 DgD4BR+EwObVdMG4a4M5QcR9euoNdg532ywyoyWtRKpX7czpicu+Q60uHGx5OKwd
 fCMVibMTv+kQ/r+UMQ/J9+B3CyZXwRzHOMlcfT/yxZdYG+o+LZkfVBfY5kn9DQFK
 I+c3LZLwqOJhuz8/yUO9azFSo+r+QvtoC/WApW28iAKXjtCss9Vi2NN9i4yEqsQ2
 BelbuiiI6DYYVP7yBWIIJJlUO9xV/JSJx8tfA0Qyp5JYaRApzZ6kZpn1vnlB3JJ3
 prkWxqy9RkQQIcsUn/tCxiX8TBoXyNR4Vb8722ACGHIUBQp+kzyRi/9xfeZoi8E3
 2PXRIX6QJSy0++YSX6wVVbYSq3DrfQoFByNwR1uvtFxIzzMoRmNuvIwWlHe/Yew5
 QQ8U1UiYnBm/I8SH0GCd/vbwB1Ar9QV3JhbgUg6tzFurj6EBRBZqAz9UYThROarZ
 LSPJ8l+D2x0vkRaFEekO0C+OMXvv3if82cqcYdx042KM07RpjN71ceoY2PZIUJK4
 jUJKAfA2h8ymGTTG/tWNiUBkjnPXkMBXMi8YWjYHJ2QdYJauagwbS6jRgPJ3eZ/I
 muVezr9vHLnIxSv0yLmcLkBepACQgjA0mIXn24XV0W/5/5Uz/BQyAUoz2h71m1ak
 bxeX5HWwp0/p0kkvSOgk
 =mFre
 -----END PGP SIGNATURE-----

Merge tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux

Pull pstore fix from Tony Luck:
 "Ensure unique filenames in pstore"

* tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
  pstore: Fix duplicate {console,ftrace}-efi entries
2014-10-18 13:25:03 -07:00
Linus Torvalds 4869447d21 Merge git://git.kernel.org/pub/scm/linux/kernel/git/aia21/ntfs
Pull NTFS update from Anton Altaparmakov:
 "Here is a small NTFS update notably implementing FIBMAP ioctl for NTFS
  by adding the bmap address space operation.  People seem to still want
  FIBMAP"

* git://git.kernel.org/pub/scm/linux/kernel/git/aia21/ntfs:
  NTFS: Bump version to 2.1.31.
  NTFS: Add bmap address space operation needed for FIBMAP ioctl.
  NTFS: Remove changelog from Documentation/filesystems/ntfs.txt.
  NTFS: Split ntfs_aops into ntfs_normal_aops and ntfs_compressed_aops in preparation for them diverging.
2014-10-18 12:54:46 -07:00
Linus Torvalds ead13aee23 NFS client updates for Linux 3.18
Highlights include:
 
 Stable fixes:
 - Fix an uninitialised pointer Oops in the writeback error path
 - Fix a bogus warning (and early exit from the loop) in nfs_generic_pgio
 
 Features:
 - Add NFSv4.2 SEEK feature and client support for lseek(SEEK_HOLE/SEEK_DATA)
 
 Other fixes:
 - pnfs: replace broken pnfs_put_lseg_async
 - Remove dead prototype for nfs4_insert_deviceid_node
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJUP4dhAAoJEGcL54qWCgDy1+EQAKpFVKDjGEik5V1ye492mGbS
 moP3zvJtGTfwoK+eCV4HqIj0oFh06RqoQc5z4vc0MKd3uuxXgPFj/wmJef48CWot
 1BKoDWItzZZlBAJsE0+0i6EWZ05tAZv7Fr9ial6VwchpNAih1K/NPcBix/jEwWYl
 WEFhKyGiN6UNhWfL0nXgvyQPD5tevvkr+5qv0A8dm8HGTEBlGhbzt4sfiUbWHPMD
 jCVsHBZNOeZQrFwVzMx+LCZaBwb+xeRAs0Pg1U51MetpwnNce9737M9oetbzgkI5
 cSACmvo76osaerC2Avxj4t713xeqfur4YRwIajamkUxWbcjXm3vaAQmE744meJOO
 IOkIrmiGfMnJHw3f5CFnsAXcXmGu16umRqTexzz5iCqZ65ZuKWgIxs9yzBCOK/Or
 f8nbGsCU2EaX8mJxf+esP4SzstxtqHRtkTj4f8D4wWm/W+PXYPCzCsI1q3rDni0U
 yNH2Z4gRWcGz6LVfL/9lDHldN5S4WLkJuZQJtyijcy1jYCjwEEUFbX1V41s85GFB
 QdQvZ7Cr4NqRyqvR7zyIdH1jTWt2N5mJytsmEbSGoXgBFzRDYCFXfSNjjJ2JfThl
 sGeWlP99uEVbTxCTTBbulFXqYrmiNN7mW61+qedqT2Oy5/YjJTSE4PCp1p2YWlx/
 /c17q7jOq6cnbKcyu7cl
 =ekPm
 -----END PGP SIGNATURE-----

Merge tag 'nfs-for-3.18-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client updates from Trond Myklebust:
 "Highlights include:

  Stable fixes:
   - fix an uninitialised pointer Oops in the writeback error path
   - fix a bogus warning (and early exit from the loop) in nfs_generic_pgio()

  Features:
   - Add NFSv4.2 SEEK feature and client support for lseek(SEEK_HOLE/SEEK_DATA)

  Other fixes:
   - pnfs: replace broken pnfs_put_lseg_async
   - Remove dead prototype for nfs4_insert_deviceid_node"

* tag 'nfs-for-3.18-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS: Fix a bogus warning in nfs_generic_pgio
  NFS: Fix an uninitialised pointer Oops in the writeback error path
  NFSv4.1/pnfs: replace broken pnfs_put_lseg_async
  NFSv4: Remove dead prototype for nfs4_insert_deviceid_node()
  NFS: Implement SEEK
2014-10-18 12:52:08 -07:00
Linus Torvalds d3dc366bba Merge branch 'for-3.18/core' of git://git.kernel.dk/linux-block
Pull core block layer changes from Jens Axboe:
 "This is the core block IO pull request for 3.18.  Apart from the new
  and improved flush machinery for blk-mq, this is all mostly bug fixes
  and cleanups.

   - blk-mq timeout updates and fixes from Christoph.

   - Removal of REQ_END, also from Christoph.  We pass it through the
     ->queue_rq() hook for blk-mq instead, freeing up one of the request
     bits.  The space was overly tight on 32-bit, so Martin also killed
     REQ_KERNEL since it's no longer used.

   - blk integrity updates and fixes from Martin and Gu Zheng.

   - Update to the flush machinery for blk-mq from Ming Lei.  Now we
     have a per hardware context flush request, which both cleans up the
     code should scale better for flush intensive workloads on blk-mq.

   - Improve the error printing, from Rob Elliott.

   - Backing device improvements and cleanups from Tejun.

   - Fixup of a misplaced rq_complete() tracepoint from Hannes.

   - Make blk_get_request() return error pointers, fixing up issues
     where we NULL deref when a device goes bad or missing.  From Joe
     Lawrence.

   - Prep work for drastically reducing the memory consumption of dm
     devices from Junichi Nomura.  This allows creating clone bio sets
     without preallocating a lot of memory.

   - Fix a blk-mq hang on certain combinations of queue depths and
     hardware queues from me.

   - Limit memory consumption for blk-mq devices for crash dump
     scenarios and drivers that use crazy high depths (certain SCSI
     shared tag setups).  We now just use a single queue and limited
     depth for that"

* 'for-3.18/core' of git://git.kernel.dk/linux-block: (58 commits)
  block: Remove REQ_KERNEL
  blk-mq: allocate cpumask on the home node
  bio-integrity: remove the needless fail handle of bip_slab creating
  block: include func name in __get_request prints
  block: make blk_update_request print prefix match ratelimited prefix
  blk-merge: don't compute bi_phys_segments from bi_vcnt for cloned bio
  block: fix alignment_offset math that assumes io_min is a power-of-2
  blk-mq: Make bt_clear_tag() easier to read
  blk-mq: fix potential hang if rolling wakeup depth is too high
  block: add bioset_create_nobvec()
  block: use bio_clone_fast() in blk_rq_prep_clone()
  block: misplaced rq_complete tracepoint
  sd: Honor block layer integrity handling flags
  block: Replace strnicmp with strncasecmp
  block: Add T10 Protection Information functions
  block: Don't merge requests if integrity flags differ
  block: Integrity checksum flag
  block: Relocate bio integrity flags
  block: Add a disk flag to block integrity profile
  block: Add prefix to block integrity profile flags
  ...
2014-10-18 11:53:51 -07:00
Steve French ff273cb879 [CIFS] Remove obsolete comment
Signed-off-by: Steven French <smfrench@gmail.com>
2014-10-17 17:17:12 -05:00
Chris Mason d37973082b Revert "Btrfs: race free update of commit root for ro snapshots"
This reverts commit 9c3b306e1c.

Switching only one commit root during a transaction is wrong because it
leads the fs into an inconsistent state. All commit roots should be
switched at once, at transaction commit time, otherwise backref walking
can often miss important references that were only accessible through
the old commit root.  Plus, the root item for the snapshot's root wasn't
getting updated and preventing the next transaction commit to do it.

This made several users get into random corruption issues after creation
of readonly snapshots.

A regression test for xfstests will follow soon.

Cc: stable@vger.kernel.org # 3.17
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
2014-10-17 02:40:59 -07:00
Steve French 9ffc541296 Check minimum response length on query_network_interface
Acked-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <smfrench@gmail.com>
2014-10-16 15:20:20 -05:00
Steve French b5b374eab1 Workaround Mac server problem
Mac server returns that they support CIFS Unix Extensions but
doesn't actually support QUERY_FILE_UNIX_BASIC so mount fails.

Workaround this problem by disabling use of Unix CIFS protocol
extensions if server returns an EOPNOTSUPP error on
QUERY_FILE_UNIX_BASIC during mount.

Signed-off-by: Steve French <smfrench@gmail.com>
2014-10-16 15:20:20 -05:00
Steve French 2baa268253 Remap reserved posix characters by default (part 3/3)
This is a bigger patch, but its size is mostly due to
a single change for how we check for remapping illegal characters
in file names - a lot of repeated, small changes to
the way callers request converting file names.

The final patch in the series does the following:

1) changes default behavior for cifs to be more intuitive.
Currently we do not map by default to seven reserved characters,
ie those valid in POSIX but not in NTFS/CIFS/SMB3/Windows,
unless a mount option (mapchars) is specified.  Change this
to by default always map and map using the SFM maping
(like the Mac uses) unless the server negotiates the CIFS Unix
Extensions (like Samba does when mounting with the cifs protocol)
when the remapping of the characters is unnecessary.  This should
help SMB3 mounts in particular since Samba will likely be
able to implement this mapping with its new "vfs_fruit" module
as it will be doing for the Mac.
2) if the user specifies the existing "mapchars" mount option then
use the "SFU" (Microsoft Services for Unix, SUA) style mapping of
the seven characters instead.
3) if the user specifies "nomapposix" then disable SFM/MAC style mapping
(so no character remapping would be used unless the user specifies
"mapchars" on mount as well, as above).
4) change all the places in the code that check for the superblock
flag on the mount which is set by mapchars and passed in on all
path based operation and change it to use a small function call
instead to set the mapping type properly (and check for the
mapping type in the cifs unicode functions)

Signed-off-by: Steve French <smfrench@gmail.com>
2014-10-16 15:20:20 -05:00
Steve French a4153cb1d3 Allow conversion of characters in Mac remap range (part 2)
The previous patch allowed remapping reserved characters from directory
listenings, this patch adds conversion the other direction, allowing
opening of files with any of the seven reserved characters.

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
2014-10-16 15:20:20 -05:00
Steve French b693855fe6 Allow conversion of characters in Mac remap range. Part 1
This allows directory listings to Mac to display filenames
correctly which have been created with illegal (to Windows)
characters in their filename. It does not allow
converting the other direction yet ie opening files with
these characters (followon patch).

There are seven reserved characters that need to be remapped when
mounting to Windows, Mac (or any server without Unix Extensions) which
are valid in POSIX but not in the other OS.

: \ < > ? * |

We used the normal UCS-2 remap range for this in order to convert this
to/from UTF8 as did Windows Services for Unix (basically add 0xF000 to
any of the 7 reserved characters), at least when the "mapchars" mount
option was specified.

Mac used a very slightly different "Services for Mac" remap range
0xF021 through 0xF027.  The attached patch allows cifs.ko (the kernel
client) to read directories on macs containing files with these
characters and display their names properly.  In theory this even
might be useful on mounts to Samba when the vfs_catia or new
"vfs_fruit" module is loaded.

Currently the 7 reserved characters look very strange in directory
listings from cifs.ko to Mac server.  This patch allows these file
name characters to be read (requires specifying mapchars on mount).

Two additional changes are needed:
1) Make it more automatic: a way of detecting enough info so that
we know to try to always remap these characters or not. Various
have suggested that the SFM approach be made the default when
the server does not support POSIX Unix extensions (cifs mounts
to Samba for example) so need to make SFM remapping the default
unless mapchars (SFU style mapping) specified on mount or no
mapping explicitly requested or no mapping needed (cifs mounts to Samba).

2) Adding a patch to map the characters the other direction
(ie UTF-8 to UCS-2 on open).  This patch does it for translating
readdir entries (ie UCS-2 to UTF-8)

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
2014-10-16 15:20:20 -05:00
Steve French c22870ea2d mfsymlinks support for SMB2.1/SMB3. Part 2 query symlink
Adds support on SMB2.1 and SMB3 mounts for emulation of symlinks
via the "Minshall/French" symlink format already used for cifs
mounts when mfsymlinks mount option is used (and also used by Apple).
  http://wiki.samba.org/index.php/UNIX_Extensions#Minshall.2BFrench_symlinks
This second patch adds support to query them (recognize them as symlinks
and read them).  Third version of patch makes minor corrections
to error handling.

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
2014-10-16 15:20:20 -05:00
Steve French 5ab97578cb Add mfsymlinks support for SMB2.1/SMB3. Part 1 create symlink
Adds support on SMB2.1 and SMB3 mounts for emulation of symlinks
via the "Minshall/French" symlink format already used for cifs
mounts when mfsymlinks mount option is used (and also used by Apple).
http://wiki.samba.org/index.php/UNIX_Extensions#Minshall.2BFrench_symlinks
This first patch adds support to create them.  The next patch will
add support for recognizing them and reading them.  Although CIFS/SMB3
have other types of symlinks, in the many use cases they aren't
practical (e.g. either require cifs only mounts with unix extensions
to Samba, or require the user to be Administrator to Windows for SMB3).
This also helps enable running additional xfstests over SMB3 (since some
xfstests directly or indirectly require symlink support).

Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stefan Metzmacher <metze@samba.org>
2014-10-16 15:20:20 -05:00
Steve French db8b631d4b Allow mknod and mkfifo on SMB2/SMB3 mounts
The "sfu" mount option did not work on SMB2/SMB3 mounts.
With these changes when the "sfu" mount option is passed in
on an smb2/smb2.1/smb3 mount the client can emulate (and
recognize) fifo and device (character and device files).

In addition the "sfu" mount option should not conflict
with "mfsymlinks" (symlink emulation) as we will never
create "sfu" style symlinks, but using "sfu" mount option
will allow us to recognize existing symlinks, created with
Microsoft "Services for Unix" (SFU and SUA).

To enable the "sfu" mount option for SMB2/SMB3 the calling
syntax of the generic cifs/smb2/smb3 sync_read and sync_write
protocol dependent function needed to be changed (we
don't have a file struct in all cases), but this actually
ended up simplifying the code a little.

Signed-off-by: Steve French <smfrench@gmail.com>
2014-10-16 15:20:19 -05:00
Steve French 7332297909 add defines for two new file attributes
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
2014-10-16 15:20:19 -05:00
Anton Altaparmakov 3569b70c40 NTFS: Bump version to 2.1.31.
Signed-off-by: Anton Altaparmakov <anton@tuxera.com>
2014-10-16 12:53:35 +01:00
Anton Altaparmakov 3f7fc6f2a2 NTFS: Add bmap address space operation needed for FIBMAP ioctl.
Signed-off-by: Anton Altaparmakov <anton@tuxera.com>
2014-10-16 12:50:52 +01:00
Anton Altaparmakov ce1bafa094 NTFS: Split ntfs_aops into ntfs_normal_aops and ntfs_compressed_aops
in preparation for them diverging.

Signed-off-by: Anton Altaparmakov <anton@tuxera.com>
2014-10-16 12:28:03 +01:00
Valdis Kletnieks d4bf205da6 pstore: Fix duplicate {console,ftrace}-efi entries
The pstore filesystem still creates duplicate filename/inode pairs for
some pstore types.  Add the id to the filename to prevent that.

Before patch:

[/sys/fs/pstore] ls -li
total 0
1250 -r--r--r--. 1 root root 67 Sep 29 17:09 console-efi
1250 -r--r--r--. 1 root root 67 Sep 29 17:09 console-efi
1250 -r--r--r--. 1 root root 67 Sep 29 17:09 console-efi
1250 -r--r--r--. 1 root root 67 Sep 29 17:09 console-efi
1250 -r--r--r--. 1 root root 67 Sep 29 17:09 console-efi
1250 -r--r--r--. 1 root root 67 Sep 29 17:09 console-efi
1250 -r--r--r--. 1 root root 67 Sep 29 17:09 console-efi
1250 -r--r--r--. 1 root root 67 Sep 29 17:09 console-efi
1250 -r--r--r--. 1 root root 67 Sep 29 17:09 console-efi

After:

[/sys/fs/pstore] ls -li
total 0
1232 -r--r--r--. 1 root root 148 Sep 29 17:09 console-efi-141202499100000
1231 -r--r--r--. 1 root root  67 Sep 29 17:09 console-efi-141202499200000
1230 -r--r--r--. 1 root root 148 Sep 29 17:44 console-efi-141202705400000
1229 -r--r--r--. 1 root root  67 Sep 29 17:44 console-efi-141202705500000
1228 -r--r--r--. 1 root root  67 Sep 29 20:42 console-efi-141203772600000
1227 -r--r--r--. 1 root root 148 Sep 29 23:42 console-efi-141204854900000
1226 -r--r--r--. 1 root root  67 Sep 29 23:42 console-efi-141204855000000
1225 -r--r--r--. 1 root root 148 Sep 29 23:59 console-efi-141204954200000
1224 -r--r--r--. 1 root root  67 Sep 29 23:59 console-efi-141204954400000

Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org # 3.6+
Signed-off-by: Tony Luck <tony.luck@intel.com>
2014-10-15 13:51:33 -07:00
Linus Torvalds 0429fbc0bd Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
Pull percpu consistent-ops changes from Tejun Heo:
 "Way back, before the current percpu allocator was implemented, static
  and dynamic percpu memory areas were allocated and handled separately
  and had their own accessors.  The distinction has been gone for many
  years now; however, the now duplicate two sets of accessors remained
  with the pointer based ones - this_cpu_*() - evolving various other
  operations over time.  During the process, we also accumulated other
  inconsistent operations.

  This pull request contains Christoph's patches to clean up the
  duplicate accessor situation.  __get_cpu_var() uses are replaced with
  with this_cpu_ptr() and __this_cpu_ptr() with raw_cpu_ptr().

  Unfortunately, the former sometimes is tricky thanks to C being a bit
  messy with the distinction between lvalues and pointers, which led to
  a rather ugly solution for cpumask_var_t involving the introduction of
  this_cpu_cpumask_var_ptr().

  This converts most of the uses but not all.  Christoph will follow up
  with the remaining conversions in this merge window and hopefully
  remove the obsolete accessors"

* 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: (38 commits)
  irqchip: Properly fetch the per cpu offset
  percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t -fix
  ia64: sn_nodepda cannot be assigned to after this_cpu conversion. Use __this_cpu_write.
  percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t
  Revert "powerpc: Replace __get_cpu_var uses"
  percpu: Remove __this_cpu_ptr
  clocksource: Replace __this_cpu_ptr with raw_cpu_ptr
  sparc: Replace __get_cpu_var uses
  avr32: Replace __get_cpu_var with __this_cpu_write
  blackfin: Replace __get_cpu_var uses
  tile: Use this_cpu_ptr() for hardware counters
  tile: Replace __get_cpu_var uses
  powerpc: Replace __get_cpu_var uses
  alpha: Replace __get_cpu_var
  ia64: Replace __get_cpu_var uses
  s390: cio driver &__get_cpu_var replacements
  s390: Replace __get_cpu_var uses
  mips: Replace __get_cpu_var uses
  MIPS: Replace __get_cpu_var uses in FPU emulator.
  arm: Replace __this_cpu_ptr with raw_cpu_ptr
  ...
2014-10-15 07:48:18 +02:00
Linus Torvalds 6929c35897 LLVMLinux patches for v3.18
-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJUPOQPAAoJEHKvRublQaWiZnQP/0bDfPvhaNKZtmDKYzbqQm9x
 Gh3fB53d7TtIei///5eD/LUGObg0Ze8g2k8aAC05hcq5Be8Haitma3iDDSvJq6ig
 umYU9BWkv47BHQy0gAVMXyaxHocICq7W9bnOvU4SSEW/sWeneBllyxgCfV7EKSTd
 B/OXP+Ovr4FtjAweOACCN8b0M9w4wdxNKfDNV+WDIHAddYBngxrwq7zASKNNCx2N
 0u9sXIdTp0Fvxmyx/lYLC5NXN0CUDjB3Ffdx3+eehrBp2lT6JdlkYU403c85cIMP
 oIPJVKFbOnM04MfCjhFNTrK9OtC2eD6PoWq+FLL0UJx3YW5HkbLsiHGm/2UTJ2Z1
 5QOwDebMxlvrb6f6Gv846ADl7YcByiXkieTDHRlOnplVRNV5Sj8UWAgq+zyq7sWq
 2uRuW2UvKx7vYoAwKRwCaIoqpIe3NIvZQzE7C9mGOprIawZ5e0YJzaR6OoBs4Y8i
 gmBeFx266URJun7isy1R7JJsMjYzxbEXju9zH/SkghbLHnf8yqafIG+pG1GD7n5R
 o2C/5TVXjmEhIoDn8j2ZozaElX4mD7REKILpIGaE4XltExNTexq8neRo9D3ajzif
 N5RrMCAkBzIxMz83evDppe3ObtkEaf0K43VCO3AVQ2g9jXg7ttKhR2hb8HRqCMHe
 Lp3d8qKyZyL/HZ5F62yX
 =zJyI
 -----END PGP SIGNATURE-----

Merge tag 'llvmlinux-for-v3.18' of git://git.linuxfoundation.org/llvmlinux/kernel

Pull LLVM updates from Behan Webster:
 "These patches remove the use of VLAIS using a new SHASH_DESC_ON_STACK
  macro.

  Some of the previously accepted VLAIS removal patches haven't used
  this macro.  I will push new patches to consistently use this macro in
  all those older cases for 3.19"

[ More LLVM patches coming in through subsystem trees, and LLVM itself
  needs some fixes that are already in many distributions but not in
  released versions of LLVM.  Some day this will all "just work"  - Linus ]

* tag 'llvmlinux-for-v3.18' of git://git.linuxfoundation.org/llvmlinux/kernel:
  crypto: LLVMLinux: Remove VLAIS usage from crypto/testmgr.c
  security, crypto: LLVMLinux: Remove VLAIS from ima_crypto.c
  crypto: LLVMLinux: Remove VLAIS usage from libcrc32c.c
  crypto: LLVMLinux: Remove VLAIS usage from crypto/hmac.c
  crypto, dm: LLVMLinux: Remove VLAIS usage from dm-crypt
  crypto: LLVMLinux: Remove VLAIS from crypto/.../qat_algs.c
  crypto: LLVMLinux: Remove VLAIS from crypto/omap_sham.c
  crypto: LLVMLinux: Remove VLAIS from crypto/n2_core.c
  crypto: LLVMLinux: Remove VLAIS from crypto/mv_cesa.c
  crypto: LLVMLinux: Remove VLAIS from crypto/ccp/ccp-crypto-sha.c
  btrfs: LLVMLinux: Remove VLAIS
  crypto: LLVMLinux: Add macro to remove use of VLAIS in crypto code
2014-10-15 07:30:52 +02:00
Linus Torvalds 6b04908166 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
Pull Ceph updates from Sage Weil:
 "There is the long-awaited discard support for RBD (Guangliang Zhao,
  Josh Durgin), a pile of RBD bug fixes that didn't belong in late -rc's
  (Ilya Dryomov, Li RongQing), a pile of fs/ceph bug fixes and
  performance and debugging improvements (Yan, Zheng, John Spray), and a
  smattering of cleanups (Chao Yu, Fabian Frederick, Joe Perches)"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (40 commits)
  ceph: fix divide-by-zero in __validate_layout()
  rbd: rbd workqueues need a resque worker
  libceph: ceph-msgr workqueue needs a resque worker
  ceph: fix bool assignments
  libceph: separate multiple ops with commas in debugfs output
  libceph: sync osd op definitions in rados.h
  libceph: remove redundant declaration
  ceph: additional debugfs output
  ceph: export ceph_session_state_name function
  ceph: include the initial ACL in create/mkdir/mknod MDS requests
  ceph: use pagelist to present MDS request data
  libceph: reference counting pagelist
  ceph: fix llistxattr on symlink
  ceph: send client metadata to MDS
  ceph: remove redundant code for max file size verification
  ceph: remove redundant io_iter_advance()
  ceph: move ceph_find_inode() outside the s_mutex
  ceph: request xattrs if xattr_version is zero
  rbd: set the remaining discard properties to enable support
  rbd: use helpers to handle discard for layered images correctly
  ...
2014-10-15 06:46:01 +02:00
Linus Torvalds ce9d7f7b45 Merge branch 'CVE-2014-7970' of git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux
Pull pivot_root() fix from Andy Lutomirski.

Prevent a leak of unreachable mounts.

* 'CVE-2014-7970' of git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux:
  mnt: Prevent pivot_root from creating a loop in the mount tree
2014-10-15 06:43:27 +02:00
Eric W. Biederman 0d0826019e mnt: Prevent pivot_root from creating a loop in the mount tree
Andy Lutomirski recently demonstrated that when chroot is used to set
the root path below the path for the new ``root'' passed to pivot_root
the pivot_root system call succeeds and leaks mounts.

In examining the code I see that starting with a new root that is
below the current root in the mount tree will result in a loop in the
mount tree after the mounts are detached and then reattached to one
another.  Resulting in all kinds of ugliness including a leak of that
mounts involved in the leak of the mount loop.

Prevent this problem by ensuring that the new mount is reachable from
the current root of the mount tree.

[Added stable cc.  Fixes CVE-2014-7970.  --Andy]

Cc: stable@vger.kernel.org
Reported-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/87bnpmihks.fsf@x220.int.ebiederm.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
2014-10-14 14:27:19 -07:00
Neale Ferguson c07127b48c dlm: fix missing endian conversion of rcom_status flags
The flags are already converted to le when being sent,
but are not being converted back to cpu when received.

Signed-off-by: Neale Ferguson <neale@sinenomine.net>
Signed-off-by: David Teigland <teigland@redhat.com>
2014-10-14 15:11:48 -05:00
Yan, Zheng 0bc62284ee ceph: fix divide-by-zero in __validate_layout()
The 'stripe_unit' field is 64 bits, casting it to 32 bits can result zero.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
2014-10-14 12:57:05 -07:00
Fabian Frederick ab6c2c3ebe ceph: fix bool assignments
Fix some coccinelle warnings:
fs/ceph/caps.c:2400:6-10: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2401:6-15: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2402:6-17: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2403:6-22: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2404:6-22: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2405:6-19: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2440:4-20: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2469:3-16: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2490:2-18: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2519:3-7: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2549:3-12: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2575:2-6: WARNING: Assignment of bool to 0/1
fs/ceph/caps.c:2589:3-7: WARNING: Assignment of bool to 0/1

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Ilya Dryomov <idryomov@redhat.com>
2014-10-14 12:57:04 -07:00
John Spray 14ed97033d ceph: additional debugfs output
MDS session state and client global ID is
useful instrumentation when testing.

Signed-off-by: John Spray <john.spray@redhat.com>
2014-10-14 12:57:01 -07:00
John Spray a687ecaf50 ceph: export ceph_session_state_name function
...so that it can be used from the ceph debugfs
code when dumping session info.

Signed-off-by: John Spray <john.spray@redhat.com>
2014-10-14 12:56:50 -07:00
Yan, Zheng b1ee94aa59 ceph: include the initial ACL in create/mkdir/mknod MDS requests
Current code set new file/directory's initial ACL in a non-atomic
manner.
Client first sends request to MDS to create new file/directory, then set
the initial ACL after the new file/directory is successfully created.

The fix is include the initial ACL in create/mkdir/mknod MDS requests.
So MDS can handle creating file/directory and setting the initial ACL in
one request.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
2014-10-14 12:56:49 -07:00
Yan, Zheng 25e6bae356 ceph: use pagelist to present MDS request data
Current code uses page array to present MDS request data. Pages in the
array are allocated/freed by caller of ceph_mdsc_do_request(). If request
is interrupted, the pages can be freed while they are still being used by
the request message.

The fix is use pagelist to present MDS request data. Pagelist is
reference counted.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
2014-10-14 12:56:49 -07:00
Yan, Zheng e4339d28f6 libceph: reference counting pagelist
this allow pagelist to present data that may be sent multiple times.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
2014-10-14 12:56:48 -07:00
Yan, Zheng 0abb43dcac ceph: fix llistxattr on symlink
only regular file and directory have vxattrs.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
2014-10-14 12:56:48 -07:00
John Spray dbd0c8bf79 ceph: send client metadata to MDS
Implement version 2 of CEPH_MSG_CLIENT_SESSION syntax,
which includes additional client metadata to allow
the MDS to report on clients by user-sensible names
like hostname.

Signed-off-by: John Spray <john.spray@redhat.com>
Reviewed-by: Yan, Zheng <zyan@redhat.com>
2014-10-14 12:56:47 -07:00
Chao Yu a4483e8a42 ceph: remove redundant code for max file size verification
Both ceph_update_writeable_page and ceph_setattr will verify file size
with max size ceph supported.
There are two caller for ceph_update_writeable_page, ceph_write_begin and
ceph_page_mkwrite. For ceph_write_begin, we have already verified the size in
generic_write_checks of ceph_write_iter; for ceph_page_mkwrite, we have no
chance to change file size when mmap. Likewise we have already verified the size
in inode_change_ok when we call ceph_setattr.
So let's remove the redundant code for max file size verification.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Reviewed-by: Yan, Zheng <zyan@redhat.com>
2014-10-14 21:03:40 +04:00
Yan, Zheng 3b70b388e3 ceph: remove redundant io_iter_advance()
ceph_sync_read and generic_file_read_iter() have already advanced the
IO iterator.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
2014-10-14 21:03:39 +04:00
Yan, Zheng 6cd3bcad0d ceph: move ceph_find_inode() outside the s_mutex
ceph_find_inode() may wait on freeing inode, using it inside the s_mutex
may cause deadlock. (the freeing inode is waiting for OSD read reply, but
dispatch thread is blocked by the s_mutex)

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
2014-10-14 21:03:39 +04:00
Yan, Zheng 508b32d866 ceph: request xattrs if xattr_version is zero
Following sequence of events can happen.
  - Client releases an inode, queues cap release message.
  - A 'lookup' reply brings the same inode back, but the reply
    doesn't contain xattrs because MDS didn't receive the cap release
    message and thought client already has up-to-data xattrs.

The fix is force sending a getattr request to MDS if xattrs_version
is 0. The getattr mask is set to CEPH_STAT_CAP_XATTR, so MDS knows client
does not have xattr.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
2014-10-14 21:03:38 +04:00
Yan, Zheng 03974e8177 ceph: make sure request isn't in any waiting list when kicking request.
we may corrupt waiting list if a request in the waiting list is kicked.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
2014-10-14 21:03:24 +04:00
Yan, Zheng 656e438294 ceph: protect kick_requests() with mdsc->mutex
Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
2014-10-14 21:03:24 +04:00
Yan, Zheng 5d23371fdb ceph: trim unused inodes before reconnecting to recovering MDS
So the recovering MDS does not need to fetch these ununsed inodes during
cache rejoin. This may reduce MDS recovery time.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
2014-10-14 21:03:22 +04:00
Martin K. Petersen e19a8a0ad2 block: Remove REQ_KERNEL
REQ_KERNEL is no longer used. Remove it and drop the redundant uio
argument to nfs_file_direct_{read,write}.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@infradead.org>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2014-10-14 09:00:44 -06:00
Vinícius Tinti 0458a953d8 btrfs: LLVMLinux: Remove VLAIS
Replaced the use of a Variable Length Array In Struct (VLAIS) with a C99
compliant equivalent.  This patch instead allocates the appropriate amount of
memory using a char array using the SHASH_DESC_ON_STACK macro.

The new code can be compiled with both gcc and clang.

Signed-off-by: Vinícius Tinti <viniciustinti@gmail.com>
Reviewed-by: Jan-Simon Möller <dl9pf@gmx.de>
Reviewed-by: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Acked-by: Chris Mason <clm@fb.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
2014-10-14 10:51:22 +02:00
Linus Torvalds 1b5a5f59e3 FS-Cache fixes
-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIVAwUAVDwD3ROxKuMESys7AQLayg//Tmdi4eLzcky/HcOfAoVIY3B5Wvs1MBbN
 3HhaYWKDeJvWxFmRDfQK0c1dyjBA2Xe7bPhdwQ8S9epAWAoW6D4g3Mg2+YReGLCK
 U/CcrMHN77RSydTG0Mj/Z99IynSdf9rwdNrCEy8NiNkGe8Z/JCFPpZurRCc4PL44
 4miTUq3ESMTGkUsa9BH+T0ngEka2ZdwnmzlYkdzeqmjmlbFx8RxcEewBeAoAlU73
 eihKKyX+1uWX/2DmJol5NtZx+BbNkFsO+pX+s+70TsbjiyILCAmgh5meTpkGsDrW
 iJGcgxwhcmyq1aTPcHRmXeNsVenbqRefGUtz7B5Q0x1Uk+ofRYfVVdiyTS2juGbC
 DFGyNBUcFqsmbSMxM+yZGSzgR9KbzoZHDR/ppbJfMqIoe+oGju/NE+AZ6Q3f2/Es
 AIGc8imc96QU08OnrZtreZxfgFMcFxBoGHvAM9AUr1ue80SWhVRZjwYx/JcIP7Cm
 TKyilgb5hfxJ7zon+JuHSqttpeG3zOTjjhcKDmJlybYkKlTeRXm6ZcKVrro5d2+z
 GLnH32HQRJvXBZslymqb7OgkxIW4ySO3PcAWTosUv9+zG0BPR1mB0NVQrSLEPk4L
 JHA+Mjp8O37pN3kRantVNHk73t0z4qkbi8Ixft0yAus9qNNFMeKh+7NbBRjxUZAU
 ARcAbvVMyT0=
 =RtLr
 -----END PGP SIGNATURE-----

Merge tag 'fscache-fixes-20141013' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull fs-cache fixes from David Howells:
 "Two fixes for bugs in CacheFiles and a cleanup in FS-Cache"

* tag 'fscache-fixes-20141013' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  fs/fscache/object-list.c: use __seq_open_private()
  CacheFiles: Fix incorrect test for in-memory object collision
  CacheFiles: Handle object being killed before being set up
2014-10-14 08:40:15 +02:00
Linus Torvalds b11445f830 * Fix for a theoretical race condition which could lead to a situation when
UBIFS is unable to mount a file-system (Hujianyang)
 * Few fixes for the ubiblock sybsystem, error path fixes
 * The ubiblock subsystem has had the volume size change handling improved
 * Few fixes and nicifications in the fastmap subsystem
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJUO9l0AAoJECmIfjd9wqK01TwP/jAcA7GEnxUpQ8UFBZhJEIN0
 0Ad4oDrGShpuEYgYyRFjCstuXErJBhMwImrevJhRmwxaY2fzGqBeDO9YKKGkKDfa
 qjGsQrUaCJgV6qC2iT056ZmI7V/XyZfnZQ4Z8nQbzafoJ3MPbB6ExqBy8CZi8q/6
 A516cen/cnZfHOQ1aqN6gyw2l976IzdJx8v0WOeYaXcvfDMrmfY8mkfh7EahOIVm
 Kz9BVlVRxxfKPCqMpm+xV8KAOsMueOnKy+6zL7rFh+AvLQBACq44BV1HkZtg2avX
 NBAo1RTPumeCht2t4nLJfgc+BJZ7cNpNFAijsWVJxp6umUqlsnbqckAx69O+JE9/
 VZjM1KN1suI0bm01bj6xysGvg+JNTMiZ+HEqiseICSWtDbnCT4qDL3MPFgmD9OYh
 9ar92Ku2HeY3DakKNd89gqw0ey28cv4i957KleneYzewcfFQ5pC/dp4thcDWa5fH
 AHoblC4ShmcURDPYsIKRZsiTUf/uf3iLFIWAGJBDnSRg4dzzjoJkenz4W5ecWFDj
 JokceklSf0zm8qAAdIUXw5Sihza1cnSBAIYBxVR808U+bwkCTOFF5xcTQy6wKf3y
 NBb+ygh/ugps8B2evJEmp6ByLWQZr8j1q7IokZtglKWN2qOTfzyMxzlWl9vOQJYq
 EQytnka5OEEXamr7g1iB
 =2XCN
 -----END PGP SIGNATURE-----

Merge tag 'upstream-3.18-rc1-v2' of git://git.infradead.org/linux-ubifs

Pull UBI/UBIFS fixes from Artem Bityutskiy:
 - fix for a theoretical race condition which could lead to a situation
   when UBIFS is unable to mount a file-system (Hujianyang)
 - a few fixes for the ubiblock sybsystem, error path fixes
 - the ubiblock subsystem has had the volume size change handling
   improved
 - a few fixes and nicifications in the fastmap subsystem

* tag 'upstream-3.18-rc1-v2' of git://git.infradead.org/linux-ubifs:
  UBI: Fastmap: Calc fastmap size correctly
  UBIFS: Fix trivial typo in power_cut_emulated()
  UBI: Fix trivial typo in __schedule_ubi_work
  UBI: wl: Rename cancel flag to shutdown
  UBI: ubi_eba_read_leb: Remove in vain variable assignment
  UBIFS: Align the dump messages of SB_NODE
  UBI: Fix livelock in produce_free_peb()
  UBI: return on error in rename_volumes()
  UBI: Improve comment on work_sem
  UBIFS: Remove bogus assert
  UBI: Dispatch update notification if the volume is updated
  UBI: block: Add support for the UBI_VOLUME_UPDATED notification
  UBI: block: Fix block device size setting
  UBI: block: fix dereference on uninitialized dev
  UBI: add missing kmem_cache_free() in process_pool_aeb error path
  UBIFS: fix free log space calculation
  UBIFS: fix a race condition
2014-10-14 08:38:54 +02:00
Linus Torvalds 0ef3a56b1c Merge branch 'CVE-2014-7975' of git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux
Pull do_umount fix from Andy Lutomirski:
 "This fix really ought to be safe.  Inside a mountns owned by a
  non-root user namespace, the namespace root almost always has
  MNT_LOCKED set (if it doesn't, then there's a bug, because rootfs
  could be exposed).  In that case, calling umount on "/" will return
  -EINVAL with or without this patch.

  Outside a userns, this patch will have no effect.  may_mount, required
  by umount, already checks
     ns_capable(current->nsproxy->mnt_ns->user_ns, CAP_SYS_ADMIN)
  so an additional capable(CAP_SYS_ADMIN) check will have no effect.

  That leaves anything that calls umount on "/" in a non-root userns
  while chrooted.  This is the case that is currently broken (it
  remounts ro, which shouldn't be allowed) and that my patch changes to
  -EPERM.  If anything relies on *that*, I'd be surprised"

* 'CVE-2014-7975' of git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux:
  fs: Add a missing permission check to do_umount
2014-10-14 08:35:01 +02:00
Peter Feiner 64e455079e mm: softdirty: enable write notifications on VMAs after VM_SOFTDIRTY cleared
For VMAs that don't want write notifications, PTEs created for read faults
have their write bit set.  If the read fault happens after VM_SOFTDIRTY is
cleared, then the PTE's softdirty bit will remain clear after subsequent
writes.

Here's a simple code snippet to demonstrate the bug:

  char* m = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE,
                 MAP_ANONYMOUS | MAP_SHARED, -1, 0);
  system("echo 4 > /proc/$PPID/clear_refs"); /* clear VM_SOFTDIRTY */
  assert(*m == '\0');     /* new PTE allows write access */
  assert(!soft_dirty(x));
  *m = 'x';               /* should dirty the page */
  assert(soft_dirty(x));  /* fails */

With this patch, write notifications are enabled when VM_SOFTDIRTY is
cleared.  Furthermore, to avoid unnecessary faults, write notifications
are disabled when VM_SOFTDIRTY is set.

As a side effect of enabling and disabling write notifications with
care, this patch fixes a bug in mprotect where vm_page_prot bits set by
drivers were zapped on mprotect.  An analogous bug was fixed in mmap by
commit c9d0bf2414 ("mm: uncached vma support with writenotify").

Signed-off-by: Peter Feiner <pfeiner@google.com>
Reported-by: Peter Feiner <pfeiner@google.com>
Suggested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Jamie Liu <jamieliu@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-10-14 02:18:28 +02:00