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7e241f647d
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>
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| .. | ||
| crush | ||
| armor.c | ||
| auth_none.c | ||
| auth_none.h | ||
| auth_x_protocol.h | ||
| auth_x.c | ||
| auth_x.h | ||
| auth.c | ||
| buffer.c | ||
| ceph_common.c | ||
| ceph_fs.c | ||
| ceph_hash.c | ||
| ceph_strings.c | ||
| cls_lock_client.c | ||
| crypto.c | ||
| crypto.h | ||
| debugfs.c | ||
| Kconfig | ||
| Makefile | ||
| messenger.c | ||
| mon_client.c | ||
| msgpool.c | ||
| osd_client.c | ||
| osdmap.c | ||
| pagelist.c | ||
| pagevec.c | ||
| snapshot.c | ||
| string_table.c | ||
| striper.c | ||