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RDMA/ucma: Introduce safer rdma_addr_size() variants

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There are several places in the ucma ABI where userspace can pass in a
sockaddr but set the address family to AF_IB.  When that happens,
rdma_addr_size() will return a size bigger than sizeof struct sockaddr_in6,
and the ucma kernel code might end up copying past the end of a buffer
not sized for a struct sockaddr_ib.

Fix this by introducing new variants

    int rdma_addr_size_in6(struct sockaddr_in6 *addr);
    int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr);

that are type-safe for the types used in the ucma ABI and return 0 if the
size computed is bigger than the size of the type passed in.  We can use
these new variants to check what size userspace has passed in before
copying any addresses.

Reported-by: <syzbot+6800425d54ed3ed8135d@syzkaller.appspotmail.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Roland Dreier
2018-03-28 11:27:22 -07:00
committed by Jason Gunthorpe
parent 38759d6175
commit 84652aefb3
3 changed files with 35 additions and 17 deletions
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2
include/rdma/ib_addr.h
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@@ -130,6 +130,8 @@ void rdma_copy_addr(struct rdma_dev_addr *dev_addr,
const unsigned char *dst_dev_addr);
int rdma_addr_size(struct sockaddr *addr);
int rdma_addr_size_in6(struct sockaddr_in6 *addr);
int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr);
int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
const union ib_gid *dgid,