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  1. 06 9月, 2019 25 次提交
  3. 29 8月, 2019 15 次提交
    • G
      Linux 4.19.69 · 97ab07e1
      由 Greg Kroah-Hartman 提交于
      97ab07e1
    • D
      rxrpc: Fix local refcounting · 6d471741
      由 David Howells 提交于 
      [ Upstream commit 68553f1a6f746bf860bce3eb42d78c26a717d9c0 ]

Fix rxrpc_unuse_local() to handle a NULL local pointer as it can be called
on an unbound socket on which rx->local is not yet set.

The following reproduced (includes omitted):

	int main(void)
	{
		socket(AF_RXRPC, SOCK_DGRAM, AF_INET);
		return 0;
	}

causes the following oops to occur:

	BUG: kernel NULL pointer dereference, address: 0000000000000010
	...
	RIP: 0010:rxrpc_unuse_local+0x8/0x1b
	...
	Call Trace:
	 rxrpc_release+0x2b5/0x338
	 __sock_release+0x37/0xa1
	 sock_close+0x14/0x17
	 __fput+0x115/0x1e9
	 task_work_run+0x72/0x98
	 do_exit+0x51b/0xa7a
	 ? __context_tracking_exit+0x4e/0x10e
	 do_group_exit+0xab/0xab
	 __x64_sys_exit_group+0x14/0x17
	 do_syscall_64+0x89/0x1d4
	 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Reported-by: syzbot+20dee719a2e090427b5f@syzkaller.appspotmail.com
Fixes: 730c5fd42c1e ("rxrpc: Fix local endpoint refcounting")
Signed-off-by: NDavid Howells <dhowells@redhat.com>
cc: Jeffrey Altman <jaltman@auristor.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      6d471741
    • D
      rxrpc: Fix local endpoint replacement · ce3f9e19
      由 David Howells 提交于 
      [ Upstream commit b00df840fb4004b7087940ac5f68801562d0d2de ]

When a local endpoint (struct rxrpc_local) ceases to be in use by any
AF_RXRPC sockets, it starts the process of being destroyed, but this
doesn't cause it to be removed from the namespace endpoint list immediately
as tearing it down isn't trivial and can't be done in softirq context, so
it gets deferred.

If a new socket comes along that wants to bind to the same endpoint, a new
rxrpc_local object will be allocated and rxrpc_lookup_local() will use
list_replace() to substitute the new one for the old.

Then, when the dying object gets to rxrpc_local_destroyer(), it is removed
unconditionally from whatever list it is on by calling list_del_init().

However, list_replace() doesn't reset the pointers in the replaced
list_head and so the list_del_init() will likely corrupt the local
endpoints list.

Fix this by using list_replace_init() instead.

Fixes: 730c5fd42c1e ("rxrpc: Fix local endpoint refcounting")
Reported-by: syzbot+193e29e9387ea5837f1d@syzkaller.appspotmail.com
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      ce3f9e19
    • D
      rxrpc: Fix read-after-free in rxrpc_queue_local() · a05354cb
      由 David Howells 提交于 
      commit 06d9532fa6b34f12a6d75711162d47c17c1add72 upstream.

rxrpc_queue_local() attempts to queue the local endpoint it is given and
then, if successful, prints a trace line.  The trace line includes the
current usage count - but we're not allowed to look at the local endpoint
at this point as we passed our ref on it to the workqueue.

Fix this by reading the usage count before queuing the work item.

Also fix the reading of local->debug_id for trace lines, which must be done
with the same consideration as reading the usage count.

Fixes: 09d2bf59 ("rxrpc: Add a tracepoint to track rxrpc_local refcounting")
Reported-by: syzbot+78e71c5bab4f76a6a719@syzkaller.appspotmail.com
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      a05354cb
    • D
      rxrpc: Fix local endpoint refcounting · f28023c4
      由 David Howells 提交于 
      commit 730c5fd42c1e3652a065448fd235cb9fafb2bd10 upstream.

The object lifetime management on the rxrpc_local struct is broken in that
the rxrpc_local_processor() function is expected to clean up and remove an
object - but it may get requeued by packets coming in on the backing UDP
socket once it starts running.

This may result in the assertion in rxrpc_local_rcu() firing because the
memory has been scheduled for RCU destruction whilst still queued:

	rxrpc: Assertion failed
	------------[ cut here ]------------
	kernel BUG at net/rxrpc/local_object.c:468!

Note that if the processor comes around before the RCU free function, it
will just do nothing because ->dead is true.

Fix this by adding a separate refcount to count active users of the
endpoint that causes the endpoint to be destroyed when it reaches 0.

The original refcount can then be used to refcount objects through the work
processor and cause the memory to be rcu freed when that reaches 0.

Fixes: 4f95dd78 ("rxrpc: Rework local endpoint management")
Reported-by: syzbot+1e0edc4b8b7494c28450@syzkaller.appspotmail.com
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      f28023c4
    • A
      powerpc: Allow flush_(inval_)dcache_range to work across ranges >4GB · 32df8a30
      由 Alastair D'Silva 提交于 
      The upstream commit:
22e9c88d486a ("powerpc/64: reuse PPC32 static inline flush_dcache_range()")
has a similar effect, but since it is a rewrite of the assembler to C, is
too invasive for stable. This patch is a minimal fix to address the issue in
assembler.

This patch applies cleanly to v5.2, v4.19 & v4.14.

When calling flush_(inval_)dcache_range with a size >4GB, we were masking
off the upper 32 bits, so we would incorrectly flush a range smaller
than intended.

This patch replaces the 32 bit shifts with 64 bit ones, so that
the full size is accounted for.
Signed-off-by: NAlastair D'Silva <alastair@d-silva.org>
Acked-by: NMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      32df8a30
    • D
      dm zoned: fix potential NULL dereference in dmz_do_reclaim() · 0d5e34c1
      由 Dan Carpenter 提交于 
      [ Upstream commit e0702d90b79d430b0ccc276ead4f88440bb51352 ]

This function is supposed to return error pointers so it matches the
dmz_get_rnd_zone_for_reclaim() function.  The current code could lead to
a NULL dereference in dmz_do_reclaim()

Fixes: b234c6d7a703 ("dm zoned: improve error handling in reclaim")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NDmitry Fomichev <dmitry.fomichev@wdc.com>
Signed-off-by: NMike Snitzer <snitzer@redhat.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      0d5e34c1
    • D
      xfs: always rejoin held resources during defer roll · 655bb2c4
      由 Darrick J. Wong 提交于 
      commit 710d707d2fa9cf4c2aa9def129e71e99513466ea upstream.

During testing of xfs/141 on a V4 filesystem, I observed some
inconsistent behavior with regards to resources that are held (i.e.
remain locked) across a defer roll.  The transaction roll always gives
the defer roll function a new transaction, even if committing the old
transaction fails.  However, the defer roll function only rejoins the
held resources if the transaction commit succeedied.  This means that
callers of defer roll have to figure out whether the held resources are
attached to the transaction being passed back.

Worse yet, if the defer roll was part of a defer finish call, we have a
third possibility: the defer finish could pass back a dirty transaction
with dirty held resources and an error code.

The only sane way to handle all of these scenarios is to require that
the code that held the resource either cancel the transaction before
unlocking and releasing the resources, or use functions that detach
resources from a transaction properly (e.g.  xfs_trans_brelse) if they
need to drop the reference before committing or cancelling the
transaction.

In order to make this so, change the defer roll code to join held
resources to the new transaction unconditionally and fix all the bhold
callers to release the held buffers correctly.
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: NBrian Foster <bfoster@redhat.com>
[mcgrof: fixes kz#204223 ]
Signed-off-by: NLuis Chamberlain <mcgrof@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      655bb2c4
    • A
      xfs: Add attibute remove and helper functions · 83a8e6b2
      由 Allison Henderson 提交于 
      commit 068f985a9e5ec70fde58d8f679994fdbbd093a36 upstream.

This patch adds xfs_attr_remove_args. These sub-routines remove
the attributes specified in @args. We will use this later for setting
parent pointers as a deferred attribute operation.
Signed-off-by: NAllison Henderson <allison.henderson@oracle.com>
Reviewed-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NDave Chinner <david@fromorbit.com>
Signed-off-by: NLuis Chamberlain <mcgrof@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      83a8e6b2
    • A
      xfs: Add attibute set and helper functions · b21ff6cf
      由 Allison Henderson 提交于 
      commit 2f3cd8091963810d85e6a5dd6ed1247e10e9e6f2 upstream.

This patch adds xfs_attr_set_args and xfs_bmap_set_attrforkoff.
These sub-routines set the attributes specified in @args.
We will use this later for setting parent pointers as a deferred
attribute operation.

[dgc: remove attr fork init code from xfs_attr_set_args().]
[dgc: xfs_attr_try_sf_addname() NULLs args.trans after commit.]
[dgc: correct sf add error handling.]
Signed-off-by: NAllison Henderson <allison.henderson@oracle.com>
Reviewed-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NDave Chinner <david@fromorbit.com>
Signed-off-by: NLuis Chamberlain <mcgrof@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      b21ff6cf
    • A
      xfs: Add helper function xfs_attr_try_sf_addname · b3a248f2
      由 Allison Henderson 提交于 
      commit 4c74a56b9de76bb6b581274b76b52535ad77c2a7 upstream.

This patch adds a subroutine xfs_attr_try_sf_addname
used by xfs_attr_set.  This subrotine will attempt to
add the attribute name specified in args in shortform,
as well and perform error handling previously done in
xfs_attr_set.

This patch helps to pre-simplify xfs_attr_set for reviewing
purposes and reduce indentation.  New function will be added
in the next patch.

[dgc: moved commit to helper function, too.]
Signed-off-by: NAllison Henderson <allison.henderson@oracle.com>
Reviewed-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NDave Chinner <david@fromorbit.com>
Signed-off-by: NLuis Chamberlain <mcgrof@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      b3a248f2
    • A
      xfs: Move fs/xfs/xfs_attr.h to fs/xfs/libxfs/xfs_attr.h · a9912f34
      由 Allison Henderson 提交于 
      commit e2421f0b5ff3ce279573036f5cfcb0ce28b422a9 upstream.

This patch moves fs/xfs/xfs_attr.h to fs/xfs/libxfs/xfs_attr.h
since xfs_attr.c is in libxfs.  We will need these later in
xfsprogs.
Signed-off-by: NAllison Henderson <allison.henderson@oracle.com>
Reviewed-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NDave Chinner <david@fromorbit.com>
Signed-off-by: NLuis Chamberlain <mcgrof@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      a9912f34
    • B
      xfs: don't trip over uninitialized buffer on extent read of corrupted inode · 17c2b7af
      由 Brian Foster 提交于 
      commit 6958d11f77d45db80f7e22a21a74d4d5f44dc667 upstream.

We've had rather rare reports of bmap btree block corruption where
the bmap root block has a level count of zero. The root cause of the
corruption is so far unknown. We do have verifier checks to detect
this form of on-disk corruption, but this doesn't cover a memory
corruption variant of the problem. The latter is a reasonable
possibility because the root block is part of the inode fork and can
reside in-core for some time before inode extents are read.

If this occurs, it leads to a system crash such as the following:

 BUG: unable to handle kernel paging request at ffffffff00000221
 PF error: [normal kernel read fault]
 ...
 RIP: 0010:xfs_trans_brelse+0xf/0x200 [xfs]
 ...
 Call Trace:
  xfs_iread_extents+0x379/0x540 [xfs]
  xfs_file_iomap_begin_delay+0x11a/0xb40 [xfs]
  ? xfs_attr_get+0xd1/0x120 [xfs]
  ? iomap_write_begin.constprop.40+0x2d0/0x2d0
  xfs_file_iomap_begin+0x4c4/0x6d0 [xfs]
  ? __vfs_getxattr+0x53/0x70
  ? iomap_write_begin.constprop.40+0x2d0/0x2d0
  iomap_apply+0x63/0x130
  ? iomap_write_begin.constprop.40+0x2d0/0x2d0
  iomap_file_buffered_write+0x62/0x90
  ? iomap_write_begin.constprop.40+0x2d0/0x2d0
  xfs_file_buffered_aio_write+0xe4/0x3b0 [xfs]
  __vfs_write+0x150/0x1b0
  vfs_write+0xba/0x1c0
  ksys_pwrite64+0x64/0xa0
  do_syscall_64+0x5a/0x1d0
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

The crash occurs because xfs_iread_extents() attempts to release an
uninitialized buffer pointer as the level == 0 value prevented the
buffer from ever being allocated or read. Change the level > 0
assert to an explicit error check in xfs_iread_extents() to avoid
crashing the kernel in the event of localized, in-core inode
corruption.
Signed-off-by: NBrian Foster <bfoster@redhat.com>
Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NLuis Chamberlain <mcgrof@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
      17c2b7af
    • D
      xfs: fix missing ILOCK unlock when xfs_setattr_nonsize fails due to EDQUOT · 11f85d4d
      由 Darrick J. Wong 提交于 
      commit 1fb254aa983bf190cfd685d40c64a480a9bafaee upstream.

Benjamin Moody reported to Debian that XFS partially wedges when a chgrp
fails on account of being out of disk quota.  I ran his reproducer
script:

# adduser dummy
# adduser dummy plugdev

# dd if=/dev/zero bs=1M count=100 of=test.img
# mkfs.xfs test.img
# mount -t xfs -o gquota test.img /mnt
# mkdir -p /mnt/dummy
# chown -c dummy /mnt/dummy
# xfs_quota -xc 'limit -g bsoft=100k bhard=100k plugdev' /mnt

(and then as user dummy)

$ dd if=/dev/urandom bs=1M count=50 of=/mnt/dummy/foo
$ chgrp plugdev /mnt/dummy/foo

and saw:

================================================
WARNING: lock held when returning to user space!
5.3.0-rc5 #rc5 Tainted: G        W
------------------------------------------------
chgrp/47006 is leaving the kernel with locks still held!
1 lock held by chgrp/47006:
 #0: 000000006664ea2d (&xfs_nondir_ilock_class){++++}, at: xfs_ilock+0xd2/0x290 [xfs]

...which is clearly caused by xfs_setattr_nonsize failing to unlock the
ILOCK after the xfs_qm_vop_chown_reserve call fails.  Add the missing
unlock.

Reported-by: benjamin.moody@gmail.com
Fixes: 253f4911 ("xfs: better xfs_trans_alloc interface")
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: NDave Chinner <dchinner@redhat.com>
Tested-by: NSalvatore Bonaccorso <carnil@debian.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      11f85d4d
    • H
      mm/zsmalloc.c: fix race condition in zs_destroy_pool · ed11e600
      由 Henry Burns 提交于 
      commit 701d678599d0c1623aaf4139c03eea260a75b027 upstream.

In zs_destroy_pool() we call flush_work(&pool->free_work).  However, we
have no guarantee that migration isn't happening in the background at
that time.

Since migration can't directly free pages, it relies on free_work being
scheduled to free the pages.  But there's nothing preventing an
in-progress migrate from queuing the work *after*
zs_unregister_migration() has called flush_work().  Which would mean
pages still pointing at the inode when we free it.

Since we know at destroy time all objects should be free, no new
migrations can come in (since zs_page_isolate() fails for fully-free
zspages).  This means it is sufficient to track a "# isolated zspages"
count by class, and have the destroy logic ensure all such pages have
drained before proceeding.  Keeping that state under the class spinlock
keeps the logic straightforward.

In this case a memory leak could lead to an eventual crash if compaction
hits the leaked page.  This crash would only occur if people are
changing their zswap backend at runtime (which eventually starts
destruction).

Link: http://lkml.kernel.org/r/20190809181751.219326-2-henryburns@google.com
Fixes: 48b4800a ("zsmalloc: page migration support")
Signed-off-by: NHenry Burns <henryburns@google.com>
Reviewed-by: NSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Henry Burns <henrywolfeburns@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Jonathan Adams <jwadams@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      ed11e600