From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 55BC62D7393; Wed, 25 Feb 2026 06:57:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772002649; cv=none; b=TMpmMzBKwcXav0NQiSjLoBlrBEbfCFj2Dhq6K/Bvxrc/uJD8m/vgP7CQIvgHF7e0iNtijGlieBeMUg9ySwjY/v9Z7mBUdqZXSFry5H9r56i+gfKOjGgxnDJTYi7NqZE/Zq/c2oK4aS8ueabmmJsca4bFAlxIXH0E0s08C4JjJYY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772002649; c=relaxed/simple; bh=Ud/WvECC/8ass2bk3d9LVvh9dJNDzK2N35x3OGwmreI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BEJ34lXfgUI6zYW/NoDVoZXa6U3hJH90oXx/9qgJFEYd131C+S8nvAuZTs/UaA1kIAfX2KkeIdpMyHsH7SVkzE8xEhVeW0eLE6hqMachzWsTAyZUkIrNDf5uRtL27wlY9TZPtprtnZwc/KoP7HHkoJEeH7wuTLCMMOwo9pBcdkY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=C4pIqmJz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="C4pIqmJz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 267F4C116D0; Wed, 25 Feb 2026 06:57:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1772002649; bh=Ud/WvECC/8ass2bk3d9LVvh9dJNDzK2N35x3OGwmreI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C4pIqmJzGeeWvAO38ZPeazEXjkIuOgIDbTcLmH6nT8ZcnmLFP19vp2MdejmxuL8q7 pl67YOLjQy84i0YlI0538PAmYhq7hzaY8MtOsaZ9SaDOmnGjwpk59MfZT8lcx2uvpW iAI/NP1EAE+M+J5DxE2FAMBDdvXI9t3ifj9+IQYc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yi Liu , Leon Romanovsky , Sasha Levin Subject: [PATCH 6.18 379/641] RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send Date: Tue, 24 Feb 2026 17:21:45 -0800 Message-ID: <20260225012357.778251705@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260225012348.915798704@linuxfoundation.org> References: <20260225012348.915798704@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yi Liu [ Upstream commit 1956f0a74ccf5dc9c3ef717f2985c3ed3400aab0 ] ib_uverbs_post_send() uses cmd.wqe_size from userspace without any validation before passing it to kmalloc() and using the allocated buffer as struct ib_uverbs_send_wr. If a user provides a small wqe_size value (e.g., 1), kmalloc() will succeed, but subsequent accesses to user_wr->opcode, user_wr->num_sge, and other fields will read beyond the allocated buffer, resulting in an out-of-bounds read from kernel heap memory. This could potentially leak sensitive kernel information to userspace. Additionally, providing an excessively large wqe_size can trigger a WARNING in the memory allocation path, as reported by syzkaller. This is inconsistent with ib_uverbs_unmarshall_recv() which properly validates that wqe_size >= sizeof(struct ib_uverbs_recv_wr) before proceeding. Add the same validation for ib_uverbs_post_send() to ensure wqe_size is at least sizeof(struct ib_uverbs_send_wr). Fixes: c3bea3d2dc53 ("RDMA/uverbs: Use the iterator for ib_uverbs_unmarshall_recv()") Signed-off-by: Yi Liu Link: https://patch.msgid.link/20260122142900.2356276-2-liuy22@mails.tsinghua.edu.cn Signed-off-by: Leon Romanovsky Signed-off-by: Sasha Levin --- drivers/infiniband/core/uverbs_cmd.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c index ce16404cdfb8c..3259e9848cc79 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -2049,7 +2049,10 @@ static int ib_uverbs_post_send(struct uverbs_attr_bundle *attrs) if (ret) return ret; - user_wr = kmalloc(cmd.wqe_size, GFP_KERNEL); + if (cmd.wqe_size < sizeof(struct ib_uverbs_send_wr)) + return -EINVAL; + + user_wr = kmalloc(cmd.wqe_size, GFP_KERNEL | __GFP_NOWARN); if (!user_wr) return -ENOMEM; -- 2.51.0