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| author | Jason Wang <jasowang@redhat.com> | 2013-11-13 14:00:40 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-11-14 16:05:27 -0500 |
| commit | 16a3fa28630331e28208872fa5341ce210b901c7 (patch) | |
| tree | 2c87d8d0b55f26c9fcc723f2f7760a455a09d4da /lib/random32.c | |
| parent | 96f8d9ecf227638c89f98ccdcdd50b569891976c (diff) | |
| download | linux-stable-16a3fa28630331e28208872fa5341ce210b901c7.tar.gz linux-stable-16a3fa28630331e28208872fa5341ce210b901c7.tar.bz2 linux-stable-16a3fa28630331e28208872fa5341ce210b901c7.zip | |
macvtap: limit head length of skb allocated
We currently use hdr_len as a hint of head length which is advertised by
guest. But when guest advertise a very big value, it can lead to an 64K+
allocating of kmalloc() which has a very high possibility of failure when host
memory is fragmented or under heavy stress. The huge hdr_len also reduce the
effect of zerocopy or even disable if a gso skb is linearized in guest.
To solves those issues, this patch introduces an upper limit (PAGE_SIZE) of the
head, which guarantees an order 0 allocation each time.
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/random32.c')
0 files changed, 0 insertions, 0 deletions