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 397D035AC28 for ; Sat, 28 Feb 2026 18:18:56 +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=1772302736; cv=none; b=iA282uucHnzEUSnBD2HtYGVFWgogm9jifRYFn73RWhjwQSn+zOCvagHcXSi3XJtbciNcpa7m+I8sBLGkYeCR2qe846aiKER1DGMtQfL5M7dw4imR4zk+4Evc+OrXaGb5qldwqNbKnj2TRDKEbhzAmPOtVoMU6Vk7tmuULrpluLY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302736; c=relaxed/simple; bh=SRVzYUSnhSJZM8KQCaBXUXUwWJef5QUJ8Nl814c1hHk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uw4Y8FybFtYbfjQ//NWdQ/DOK/TDIaugLPbwJRredCRYb3iibqdgwZqfR0q9Jqo6GxC81iCspglm2AQfZ+pd4ZcvqJZtcK+sV+vgt7Zus1d7fmp5etsGfhnTk2MOnsQpBw1jeDarATZIc3d6k7ZTKWZya6b8RBZynRiGjHw3oaA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BzKpZ5Ne; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BzKpZ5Ne" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E726C19423; Sat, 28 Feb 2026 18:18:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772302736; bh=SRVzYUSnhSJZM8KQCaBXUXUwWJef5QUJ8Nl814c1hHk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BzKpZ5Ne8V6Xz8HLw1EV4nzGbwis8ChJMG+VatYq9N8ZmSLhIKUB1Vcb2Qy1EQHXW pzbGqaoelabV0kDkni5Hy/zBhtNnHrYwTiKokgngNiEsloD7bYK2Uo8mWDO7qWd4Eu TsQhMBOVXGOr4fGPPyV+rpRSi773dIxm40KlVXJ2x1T6Mz8NGdV2U4VGVsFc2w7pT7 qYheMipBOgcQP04Ra2cO0f0C9W6tNJbdbi1rmJUqvYZ6KG8LtkSwsZWXsU//tqFDnV 8kmPVZcLhIS5BUdo0Nl/cCdt/4Ko5MQrjpCDkshgHdUwIkbYjYLX2uiMj8CU7fP9Sl Noli4u5P+HXNQ== From: Sasha Levin To: patches@lists.linux.dev Cc: Yi Liu , Leon Romanovsky , Sasha Levin Subject: [PATCH 5.10 099/147] RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send Date: Sat, 28 Feb 2026 13:16:47 -0500 Message-ID: <20260228181736.1605592-99-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228181736.1605592-1-sashal@kernel.org> References: <20260228181736.1605592-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit 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 6658de58b5144..cdcdafee07f68 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -2017,7 +2017,10 @@ 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