From b0d95e686f454c3af6a908707c2e047796ea4280 Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Wed, 28 Mar 2018 11:27:22 -0700 Subject: [PATCH] RDMA/ucma: Introduce safer rdma_addr_size() variants commit 84652aefb347297aa08e91e283adf7b18f77c2d5 upstream. 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: Signed-off-by: Roland Dreier Signed-off-by: Jason Gunthorpe Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/core/addr.c | 16 ++++++++++++++++ drivers/infiniband/core/ucma.c | 34 +++++++++++++++++----------------- include/rdma/ib_addr.h | 2 ++ 3 files changed, 35 insertions(+), 17 deletions(-) diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c index 7d39bfccdd92..40475ebf3a61 100644 --- a/drivers/infiniband/core/addr.c +++ b/drivers/infiniband/core/addr.c @@ -207,6 +207,22 @@ int rdma_addr_size(struct sockaddr *addr) } EXPORT_SYMBOL(rdma_addr_size); +int rdma_addr_size_in6(struct sockaddr_in6 *addr) +{ + int ret = rdma_addr_size((struct sockaddr *) addr); + + return ret <= sizeof(*addr) ? ret : 0; +} +EXPORT_SYMBOL(rdma_addr_size_in6); + +int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr) +{ + int ret = rdma_addr_size((struct sockaddr *) addr); + + return ret <= sizeof(*addr) ? ret : 0; +} +EXPORT_SYMBOL(rdma_addr_size_kss); + static struct rdma_addr_client self; void rdma_addr_register_client(struct rdma_addr_client *client) diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c index 6cd51274ba21..722235bed075 100644 --- a/drivers/infiniband/core/ucma.c +++ b/drivers/infiniband/core/ucma.c @@ -632,6 +632,9 @@ static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf, if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; + if (!rdma_addr_size_in6(&cmd.addr)) + return -EINVAL; + ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); @@ -645,22 +648,21 @@ static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf, int in_len, int out_len) { struct rdma_ucm_bind cmd; - struct sockaddr *addr; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; - addr = (struct sockaddr *) &cmd.addr; - if (cmd.reserved || !cmd.addr_size || (cmd.addr_size != rdma_addr_size(addr))) + if (cmd.reserved || !cmd.addr_size || + cmd.addr_size != rdma_addr_size_kss(&cmd.addr)) return -EINVAL; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); - ret = rdma_bind_addr(ctx->cm_id, addr); + ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr); ucma_put_ctx(ctx); return ret; } @@ -670,23 +672,22 @@ static ssize_t ucma_resolve_ip(struct ucma_file *file, int in_len, int out_len) { struct rdma_ucm_resolve_ip cmd; - struct sockaddr *src, *dst; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; - src = (struct sockaddr *) &cmd.src_addr; - dst = (struct sockaddr *) &cmd.dst_addr; - if (!rdma_addr_size(src) || !rdma_addr_size(dst)) + if (!rdma_addr_size_in6(&cmd.src_addr) || + !rdma_addr_size_in6(&cmd.dst_addr)) return -EINVAL; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); - ret = rdma_resolve_addr(ctx->cm_id, src, dst, cmd.timeout_ms); + ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr, + (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms); ucma_put_ctx(ctx); return ret; } @@ -696,24 +697,23 @@ static ssize_t ucma_resolve_addr(struct ucma_file *file, int in_len, int out_len) { struct rdma_ucm_resolve_addr cmd; - struct sockaddr *src, *dst; struct ucma_context *ctx; int ret; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; - src = (struct sockaddr *) &cmd.src_addr; - dst = (struct sockaddr *) &cmd.dst_addr; - if (cmd.reserved || (cmd.src_size && (cmd.src_size != rdma_addr_size(src))) || - !cmd.dst_size || (cmd.dst_size != rdma_addr_size(dst))) + if (cmd.reserved || + (cmd.src_size && (cmd.src_size != rdma_addr_size_kss(&cmd.src_addr))) || + !cmd.dst_size || (cmd.dst_size != rdma_addr_size_kss(&cmd.dst_addr))) return -EINVAL; ctx = ucma_get_ctx(file, cmd.id); if (IS_ERR(ctx)) return PTR_ERR(ctx); - ret = rdma_resolve_addr(ctx->cm_id, src, dst, cmd.timeout_ms); + ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr, + (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms); ucma_put_ctx(ctx); return ret; } @@ -1432,7 +1432,7 @@ static ssize_t ucma_join_ip_multicast(struct ucma_file *file, join_cmd.response = cmd.response; join_cmd.uid = cmd.uid; join_cmd.id = cmd.id; - join_cmd.addr_size = rdma_addr_size((struct sockaddr *) &cmd.addr); + join_cmd.addr_size = rdma_addr_size_in6(&cmd.addr); if (!join_cmd.addr_size) return -EINVAL; @@ -1451,7 +1451,7 @@ static ssize_t ucma_join_multicast(struct ucma_file *file, if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; - if (!rdma_addr_size((struct sockaddr *)&cmd.addr)) + if (!rdma_addr_size_kss(&cmd.addr)) return -EINVAL; return ucma_process_join(file, &cmd, out_len); diff --git a/include/rdma/ib_addr.h b/include/rdma/ib_addr.h index b2a10c762304..bec461bd6472 100644 --- a/include/rdma/ib_addr.h +++ b/include/rdma/ib_addr.h @@ -129,6 +129,8 @@ int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev, 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_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id); int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,