From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx48HrTj88nL8IMpEwWxa+UssP+hQr+6ElSdnU2MQ7PAytJkHtFKtVftvcsRkV15QktiEoL7d ARC-Seal: i=1; a=rsa-sha256; t=1523021896; cv=none; d=google.com; s=arc-20160816; b=EZlX/lVFBqdhNMUrcfmhWLXd6Hyj3/ZKbSXr7V8M6GQw2gIQcdAqw89/5QCNfqjzGM G/INDxlbirxXSRuvWTq66SFQhCUyhpo+1BTBX9VtKnpqSw0wESn5Bx9QOJb7Xl074ZNO BBoTF3FleLRT/Rar4SaY1zksVsI94/jqrGlbeBu05uTOe8Rq6BTCEIStpk5u489PaV4Y Q1EA9nnSP9gY2urFQ234LpAih/PDdeo8eBKyOiKbrmpcwIbyGkFzwsmdWwOzJ5XfMNz0 J1AtDf5cfRSkG3H7GL0NUZc0dEH4v7LF3XqqGGimvxfdyYI7qyYlXm/0eJUMJqxfZ0bf WHyg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=Bwuz0YUqJIVYIQo5VztymeElwdNZpnPDYlWiETXGBxE=; b=zId2m/n5niYvkomQDewnZR7GVy/Vfr5CUt9aiozS/rGezdtNkj8Gw8ngkjfAgwg9qP ztC8mx7kvg7y9WVoUwdcLrnjoXKVQp0eWSPy9ZSbAtZ+E/aJiJLMUkJ0gGE6jKBQT+cO 2j2HNUOVZKiHyuCrexCggWZm9KX/d93k4um7035D5ZyASLkavzde1HNww7qFu7GDz6v1 T50yt5JuMvRoiOiZ2BP+/uLx3q+wPW1we4l3pX9qp4KTHqu46f7BJd3F6DiQVeBkgRcR J6HtWjm0L71T2GRX0r66wRX7LgTz08ZMMmkiz38Gl9Aqbhd+zihQnTreRiGodk6V7Hg8 +Bcg== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+6800425d54ed3ed8135d@syzkaller.appspotmail.com, Roland Dreier , Jason Gunthorpe Subject: [PATCH 4.14 25/67] RDMA/ucma: Introduce safer rdma_addr_size() variants Date: Fri, 6 Apr 2018 15:23:55 +0200 Message-Id: <20180406084344.707345781@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180406084341.225558262@linuxfoundation.org> References: <20180406084341.225558262@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1597003728839634146?= X-GMAIL-MSGID: =?utf-8?q?1597004208157940712?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Roland Dreier 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(-) --- 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) --- a/drivers/infiniband/core/ucma.c +++ b/drivers/infiniband/core/ucma.c @@ -632,6 +632,9 @@ static ssize_t ucma_bind_ip(struct ucma_ 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_fil 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 uc 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 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(st 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(struc 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); --- a/include/rdma/ib_addr.h +++ b/include/rdma/ib_addr.h @@ -129,6 +129,8 @@ int rdma_copy_addr(struct rdma_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_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,