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 8142115AF9; Sun, 26 May 2024 09:42:02 +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=1716716522; cv=none; b=XlFflFUyv3pt8OjiIe9KFgH0j/7mQCtvPfitwqS/V6AtVpi9NJMAiLtqfcvy28MXHgHGHih3oKgDoakuvd/ONRavNu9uWtRSOCDL2KMw7bjlUh1ZtOzP5k9N4v6PG/hiQ4z5HFnvYMDYB9y6s3tKJJmBzR/28RsDfCAU22Kprxg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716716522; c=relaxed/simple; bh=sPOMEAkL3Aby6H8ykdeGQpllNQzYaZBxOLlMe/5uBD0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pwQY6m4zMPpCptjNtKq4lfE/xzh2shXYDHpnTJC82THsH9sn5LGVIlTgPppKxMD4gKPUZwAn78WNvpiiUCF/ZR80bavTpnhdSH27W8iXYfKxULrb/g1No555C8Ml/vU7zcIjt1IH/ENFnfpeYdTMajSLy2NqtBw4nAY1Vbxj1U8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MhqicgXN; 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="MhqicgXN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 610EFC4AF13; Sun, 26 May 2024 09:42:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1716716522; bh=sPOMEAkL3Aby6H8ykdeGQpllNQzYaZBxOLlMe/5uBD0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MhqicgXNlaS5s+qjh6lGsFS2LyrULmUZ2tyQGFQ5La7SwuiphrTEt02E6oNuA3Yfv g3uI9kJc6sY6zYvzYgAR0/AKSqrxESlS4Gu46UFtQYQiVJIU8+zO7/kTYnrM59f3UR SQaS/Rzqj9X69cZZxNHczfQyWSQxe9uxWgNRMATIelu7tQAMwBOViy0Qlw41Or4mNi 7/EahQZnhsf/Vs5bRluU2KYqksevPnCsC9RlhSdWptrda86gJgO40GxexzRcGbA1mV 5/WxzctkTh+EC1kC700w11dWLdHKWX7x0ezYN4S/fInkpBG91Oc5sXvSFtGGnkdMe7 UkWZtY6hFk4AA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jens Axboe , Sasha Levin , io-uring@vger.kernel.org Subject: [PATCH AUTOSEL 6.9 06/15] io_uring/sqpoll: work around a potential audit memory leak Date: Sun, 26 May 2024 05:41:38 -0400 Message-ID: <20240526094152.3412316-6-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240526094152.3412316-1-sashal@kernel.org> References: <20240526094152.3412316-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.9.1 Content-Transfer-Encoding: 8bit From: Jens Axboe [ Upstream commit c4ce0ab27646f4206a9eb502d6fe45cb080e1cae ] kmemleak complains that there's a memory leak related to connect handling: unreferenced object 0xffff0001093bdf00 (size 128): comm "iou-sqp-455", pid 457, jiffies 4294894164 hex dump (first 32 bytes): 02 00 fa ea 7f 00 00 01 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 2e481b1a): [<00000000c0a26af4>] kmemleak_alloc+0x30/0x38 [<000000009c30bb45>] kmalloc_trace+0x228/0x358 [<000000009da9d39f>] __audit_sockaddr+0xd0/0x138 [<0000000089a93e34>] move_addr_to_kernel+0x1a0/0x1f8 [<000000000b4e80e6>] io_connect_prep+0x1ec/0x2d4 [<00000000abfbcd99>] io_submit_sqes+0x588/0x1e48 [<00000000e7c25e07>] io_sq_thread+0x8a4/0x10e4 [<00000000d999b491>] ret_from_fork+0x10/0x20 which can can happen if: 1) The command type does something on the prep side that triggers an audit call. 2) The thread hasn't done any operations before this that triggered an audit call inside ->issue(), where we have audit_uring_entry() and audit_uring_exit(). Work around this by issuing a blanket NOP operation before the SQPOLL does anything. Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- io_uring/sqpoll.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c index 3983708cef5b4..554c7212aa463 100644 --- a/io_uring/sqpoll.c +++ b/io_uring/sqpoll.c @@ -291,6 +291,14 @@ static int io_sq_thread(void *data) sqd->sq_cpu = raw_smp_processor_id(); } + /* + * Force audit context to get setup, in case we do prep side async + * operations that would trigger an audit call before any issue side + * audit has been done. + */ + audit_uring_entry(IORING_OP_NOP); + audit_uring_exit(true, 0); + mutex_lock(&sqd->lock); while (1) { bool cap_entries, sqt_spin = false; -- 2.43.0