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Tue, 11 Jun 2019 23:56:06 +0000 Received: from YTOPR0101MB0793.CANPRD01.PROD.OUTLOOK.COM ([fe80::3535:ab58:99bd:516]) by YTOPR0101MB0793.CANPRD01.PROD.OUTLOOK.COM ([fe80::3535:ab58:99bd:516%7]) with mapi id 15.20.1965.017; Tue, 11 Jun 2019 23:56:06 +0000 From: "Stephen Bates" To: "linux-block@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Jens Axboe , "mark.rutland@arm.com" , "shhuiw@foxmail.com" , Logan Gunthorpe , "viro@zeniv.linux.org.uk" Subject: [PATCH] io_uring: fix SQPOLL cpu check Thread-Topic: [PATCH] io_uring: fix SQPOLL cpu check Thread-Index: AQHVILE8MKvlFSwx2kqc/AjEamoMkQ== Date: Tue, 11 Jun 2019 23:56:06 +0000 Message-ID: <5D2859FE-DB39-48F5-BBB5-6EDD3791B6C3@raithlin.com> Accept-Language: en-CA, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/10.1a.0.190609 authentication-results: spf=none (sender IP is ) smtp.mailfrom=sbates@raithlin.com; x-originating-ip: [2001:bb6:a2c:ed58:2ca3:41e6:9240:e71d] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 2759eb70-7fcd-4e28-87ee-08d6eec85eb9 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(7021145)(8989299)(4534185)(7022145)(4603075)(4627221)(201702281549075)(8990200)(7048125)(7024125)(7027125)(7023125)(5600148)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:YTOPR0101MB2250; 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This means cpu is clamped and therefore no error occurs when out-of-range values are passed in from userspace. This is in violation of the specification for io_ring_setup() and causes the io_ring_setup unit test in liburing to regress. Add a new bounds check on sq_thread_cpu at the start of io_sq_offload_start() so we can exit the function early when bad values are passed in. Fixes: 975554b03edd ("io_uring: fix SQPOLL cpu validation") Signed-off-by: Stephen Bates --- fs/io_uring.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/io_uring.c b/fs/io_uring.c index 30a5687..e458470 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2316,6 +2316,9 @@ static int io_sq_offload_start(struct io_ring_ctx *ctx, { int ret; + if (p->sq_thread_cpu >= nr_cpu_ids) + return -EINVAL; + init_waitqueue_head(&ctx->sqo_wait); mmgrab(current->mm); ctx->sqo_mm = current->mm;