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linux-next/net/ceph
Ilya Dryomov 7e241f647d libceph: fall back to sendmsg for slab pages
skb_can_coalesce() allows coalescing neighboring slab objects into
a single frag:

  return page == skb_frag_page(frag) &&
         off == frag->page_offset + skb_frag_size(frag);

ceph_tcp_sendpage() can be handed slab pages.  One example of this is
XFS: it passes down sector sized slab objects for its metadata I/O.  If
the kernel client is co-located on the OSD node, the skb may go through
loopback and pop on the receive side with the exact same set of frags.
When tcp_recvmsg() attempts to copy out such a frag, hardened usercopy
complains because the size exceeds the object's allocated size:

  usercopy: kernel memory exposure attempt detected from ffff9ba917f20a00 (kmalloc-512) (1024 bytes)

Although skb_can_coalesce() could be taught to return false if the
resulting frag would cross a slab object boundary, we already have
a fallback for non-refcounted pages.  Utilize it for slab pages too.

Cc: stable@vger.kernel.org # 4.8+
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2018-11-19 17:59:47 +01:00
..
crush crush: fix using plain integer as NULL warning 2018-08-13 17:55:44 +02:00
armor.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
auth_none.c ceph: fix whitespace 2018-08-02 21:33:21 +02:00
auth_none.h ceph: fix whitespace 2018-08-02 21:33:21 +02:00
auth_x_protocol.h libceph: add authorizer challenge 2018-08-02 21:33:24 +02:00
auth_x.c libceph: weaken sizeof check in ceph_x_verify_authorizer_reply() 2018-08-02 21:33:26 +02:00
auth_x.h ceph: fix whitespace 2018-08-02 21:33:21 +02:00
auth.c libceph: add authorizer challenge 2018-08-02 21:33:24 +02:00
buffer.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ceph_common.c libceph: remove unnecessary non NULL check for request_key 2018-08-13 17:55:44 +02:00
ceph_fs.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ceph_hash.c ceph: mark expected switch fall-throughs 2017-11-13 12:11:39 +01:00
ceph_strings.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cls_lock_client.c libceph: use timespec64 in for keepalive2 and ticket validity 2018-08-02 21:26:12 +02:00
crypto.c libceph: Remove VLA usage of skcipher 2018-09-28 12:46:07 +08:00
crypto.h libceph: Remove VLA usage of skcipher 2018-09-28 12:46:07 +08:00
debugfs.c libceph, ceph: add __init attribution to init funcitons 2018-04-02 10:12:48 +02:00
Kconfig ceph: fix whitespace 2018-08-02 21:33:21 +02:00
Makefile ceph: fix whitespace 2018-08-02 21:33:21 +02:00
messenger.c libceph: fall back to sendmsg for slab pages 2018-11-19 17:59:47 +01:00
mon_client.c ceph: fix whitespace 2018-08-02 21:33:21 +02:00
msgpool.c libceph: preallocate message data items 2018-10-22 10:28:22 +02:00
osd_client.c libceph: support the RADOS copy-from operation 2018-10-22 10:28:23 +02:00
osdmap.c The main piece is a set of libceph changes that revamps how OSD 2018-06-15 07:24:58 +09:00
pagelist.c libceph: introduce ceph_pagelist_alloc() 2018-10-22 10:28:21 +02:00
pagevec.c ceph: fix whitespace 2018-08-02 21:33:21 +02:00
snapshot.c libceph: convert ceph_snap_context.nref from atomic_t to refcount_t 2017-05-04 09:19:18 +02:00
string_table.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
striper.c libceph, ceph: move ceph_calc_file_object_mapping() to striper.c 2018-04-02 10:12:43 +02:00