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  1. 06 9月, 2019 34 次提交
  3. 29 8月, 2019 6 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