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Tue, 05 Nov 2019 15:43:32 -0800 (PST) Received: from [192.168.43.132] ([109.126.129.81]) by smtp.gmail.com with ESMTPSA id z6sm23447096wro.18.2019.11.05.15.43.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Nov 2019 15:43:32 -0800 (PST) Subject: Re: [PATCH 3/3] io_uring: use inlined struct sqe_submit To: Jens Axboe , io-uring@vger.kernel.org, linux-block@vger.kernel.org References: <589994ea-6528-eac0-e0c6-b496ee5bebd2@kernel.dk> From: Pavel Begunkov Autocrypt: addr=asml.silence@gmail.com; prefer-encrypt=mutual; keydata= mQINBFmKBOQBEAC76ZFxLAKpDw0bKQ8CEiYJRGn8MHTUhURL02/7n1t0HkKQx2K1fCXClbps bdwSHrhOWdW61pmfMbDYbTj6ZvGRvhoLWfGkzujB2wjNcbNTXIoOzJEGISHaPf6E2IQx1ik9 6uqVkK1OMb7qRvKH0i7HYP4WJzYbEWVyLiAxUj611mC9tgd73oqZ2pLYzGTqF2j6a/obaqha +hXuWTvpDQXqcOZJXIW43atprH03G1tQs7VwR21Q1eq6Yvy2ESLdc38EqCszBfQRMmKy+cfp W3U9Mb1w0L680pXrONcnlDBCN7/sghGeMHjGKfNANjPc+0hzz3rApPxpoE7HC1uRiwC4et83 CKnncH1l7zgeBT9Oa3qEiBlaa1ZCBqrA4dY+z5fWJYjMpwI1SNp37RtF8fKXbKQg+JuUjAa9 Y6oXeyEvDHMyJYMcinl6xCqCBAXPHnHmawkMMgjr3BBRzODmMr+CPVvnYe7BFYfoajzqzq+h EyXSl3aBf0IDPTqSUrhbmjj5OEOYgRW5p+mdYtY1cXeK8copmd+fd/eTkghok5li58AojCba jRjp7zVOLOjDlpxxiKhuFmpV4yWNh5JJaTbwCRSd04sCcDNlJj+TehTr+o1QiORzc2t+N5iJ NbILft19Izdn8U39T5oWiynqa1qCLgbuFtnYx1HlUq/HvAm+kwARAQABtDFQYXZlbCBCZWd1 bmtvdiAoc2lsZW5jZSkgPGFzbWwuc2lsZW5jZUBnbWFpbC5jb20+iQJOBBMBCAA4FiEE+6Ju PTjTbx479o3OWt5b1Glr+6UFAlmKBOQCGwMFCwkIBwIGFQgJCgsCBBYCAwECHgECF4AACgkQ Wt5b1Glr+6WxZA//QueaKHzgdnOikJ7NA/Vq8FmhRlwgtP0+E+w93kL+ZGLzS/cUCIjn2f4Q Mcutj2Neg0CcYPX3b2nJiKr5Vn0rjJ/suiaOa1h1KzyNTOmxnsqE5fmxOf6C6x+NKE18I5Jy xzLQoktbdDVA7JfB1itt6iWSNoOTVcvFyvfe5ggy6FSCcP+m1RlR58XxVLH+qlAvxxOeEr/e aQfUzrs7gqdSd9zQGEZo0jtuBiB7k98t9y0oC9Jz0PJdvaj1NZUgtXG9pEtww3LdeXP/TkFl HBSxVflzeoFaj4UAuy8+uve7ya/ECNCc8kk0VYaEjoVrzJcYdKP583iRhOLlZA6HEmn/+Gh9 4orG67HNiJlbFiW3whxGizWsrtFNLsSP1YrEReYk9j1SoUHHzsu+ZtNfKuHIhK0sU07G1OPN 2rDLlzUWR9Jc22INAkhVHOogOcc5ajMGhgWcBJMLCoi219HlX69LIDu3Y34uIg9QPZIC2jwr 24W0kxmK6avJr7+n4o8m6sOJvhlumSp5TSNhRiKvAHB1I2JB8Q1yZCIPzx+w1ALxuoWiCdwV M/azguU42R17IuBzK0S3hPjXpEi2sK/k4pEPnHVUv9Cu09HCNnd6BRfFGjo8M9kZvw360gC1 reeMdqGjwQ68o9x0R7NBRrtUOh48TDLXCANAg97wjPoy37dQE7e5Ag0EWYoE5AEQAMWS+aBV IJtCjwtfCOV98NamFpDEjBMrCAfLm7wZlmXy5I6o7nzzCxEw06P2rhzp1hIqkaab1kHySU7g dkpjmQ7Jjlrf6KdMP87mC/Hx4+zgVCkTQCKkIxNE76Ff3O9uTvkWCspSh9J0qPYyCaVta2D1 Sq5HZ8WFcap71iVO1f2/FEHKJNz/YTSOS/W7dxJdXl2eoj3gYX2UZNfoaVv8OXKaWslZlgqN jSg9wsTv1K73AnQKt4fFhscN9YFxhtgD/SQuOldE5Ws4UlJoaFX/yCoJL3ky2kC0WFngzwRF Yo6u/KON/o28yyP+alYRMBrN0Dm60FuVSIFafSqXoJTIjSZ6olbEoT0u17Rag8BxnxryMrgR dkccq272MaSS0eOC9K2rtvxzddohRFPcy/8bkX+t2iukTDz75KSTKO+chce62Xxdg62dpkZX xK+HeDCZ7gRNZvAbDETr6XI63hPKi891GeZqvqQVYR8e+V2725w+H1iv3THiB1tx4L2bXZDI DtMKQ5D2RvCHNdPNcZeldEoJwKoA60yg6tuUquvsLvfCwtrmVI2rL2djYxRfGNmFMrUDN1Xq F3xozA91q3iZd9OYi9G+M/OA01husBdcIzj1hu0aL+MGg4Gqk6XwjoSxVd4YT41kTU7Kk+/I 5/Nf+i88ULt6HanBYcY/+Daeo/XFABEBAAGJAjYEGAEIACAWIQT7om49ONNvHjv2jc5a3lvU aWv7pQUCWYoE5AIbDAAKCRBa3lvUaWv7pfmcEACKTRQ28b1y5ztKuLdLr79+T+LwZKHjX++P 4wKjEOECCcB6KCv3hP+J2GCXDOPZvdg/ZYZafqP68Yy8AZqkfa4qPYHmIdpODtRzZSL48kM8 LRzV8Rl7J3ItvzdBRxf4T/Zseu5U6ELiQdCUkPGsJcPIJkgPjO2ROG/ZtYa9DvnShNWPlp+R uPwPccEQPWO/NP4fJl2zwC6byjljZhW5kxYswGMLBwb5cDUZAisIukyAa8Xshdan6C2RZcNs rB3L7vsg/R8UCehxOH0C+NypG2GqjVejNZsc7bgV49EOVltS+GmGyY+moIzxsuLmT93rqyII 5rSbbcTLe6KBYcs24XEoo49Zm9oDA3jYvNpeYD8rDcnNbuZh9kTgBwFN41JHOPv0W2FEEWqe JsCwQdcOQ56rtezdCJUYmRAt3BsfjN3Jn3N6rpodi4Dkdli8HylM5iq4ooeb5VkQ7UZxbCWt UVMKkOCdFhutRmYp0mbv2e87IK4erwNHQRkHUkzbsuym8RVpAZbLzLPIYK/J3RTErL6Z99N2 m3J6pjwSJY/zNwuFPs9zGEnRO4g0BUbwGdbuvDzaq6/3OJLKohr5eLXNU3JkT+3HezydWm3W OPhauth7W0db74Qd49HXK0xe/aPrK+Cp+kU1HRactyNtF8jZQbhMCC8vMGukZtWaAwpjWiiH bA== Message-ID: Date: Wed, 6 Nov 2019 02:43:23 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <589994ea-6528-eac0-e0c6-b496ee5bebd2@kernel.dk> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="WlVl7eLDMKVyvfWUhS6y6TFezwOYpedLu" Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --WlVl7eLDMKVyvfWUhS6y6TFezwOYpedLu Content-Type: multipart/mixed; boundary="WkrlIt2ORJKwerlhxjDy7oduk0TfsEiyh"; protected-headers="v1" From: Pavel Begunkov To: Jens Axboe , io-uring@vger.kernel.org, linux-block@vger.kernel.org Message-ID: Subject: Re: [PATCH 3/3] io_uring: use inlined struct sqe_submit References: <589994ea-6528-eac0-e0c6-b496ee5bebd2@kernel.dk> In-Reply-To: <589994ea-6528-eac0-e0c6-b496ee5bebd2@kernel.dk> --WkrlIt2ORJKwerlhxjDy7oduk0TfsEiyh Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 06/11/2019 02:37, Jens Axboe wrote: > On 11/5/19 4:04 PM, Pavel Begunkov wrote: >> @@ -2475,31 +2475,30 @@ static int __io_queue_sqe(struct io_ring_ctx *= ctx, struct io_kiocb *req, >> return ret; >> } >> =20 >> -static int io_queue_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req= , >> - struct sqe_submit *s) >> +static int io_queue_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req= ) >> { >> int ret; >> =20 >> - ret =3D io_req_defer(ctx, req, s->sqe); >> + ret =3D io_req_defer(ctx, req); >> if (ret) { >> if (ret !=3D -EIOCBQUEUED) { >> io_free_req(req, NULL); >> - io_cqring_add_event(ctx, s->sqe->user_data, ret); >> + io_cqring_add_event(ctx, req->submit.sqe->user_data, ret); >=20 > Cases like these are now (or can be) use-after-free. Same with this one= : >=20 Hmm, lost this in rebasing. Good catch! >> @@ -2507,12 +2506,12 @@ static int io_queue_link_head(struct io_ring_c= tx *ctx, struct io_kiocb *req, >> * list. >> */ >> req->flags |=3D REQ_F_IO_DRAIN; >> - ret =3D io_req_defer(ctx, req, s->sqe); >> + ret =3D io_req_defer(ctx, req); >> if (ret) { >> if (ret !=3D -EIOCBQUEUED) { >> io_free_req(req, NULL); >> __io_free_req(shadow); >> - io_cqring_add_event(ctx, s->sqe->user_data, ret); >> + io_cqring_add_event(ctx, req->submit.sqe->user_data, ret); >> return 0; >=20 > Free the req, then deref it... >=20 --=20 Pavel Begunkov --WkrlIt2ORJKwerlhxjDy7oduk0TfsEiyh-- --WlVl7eLDMKVyvfWUhS6y6TFezwOYpedLu Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEE+6JuPTjTbx479o3OWt5b1Glr+6UFAl3CCRwACgkQWt5b1Glr +6WTMw//T7HN+y3UDhFDuxrRjcmxqdU7b4SpzIT4LeC358tlbFXoHD+yVvOaiK5z 73gVuas+9gFSgMzoFywtKgawBjuwsFgul8DwWru4/9deBfMKs1TG2+Ep8RGOp6Tm Zyqc1gcnwikD+sND1qPDabVu4YGWI3CO0msnRWhCcQjTnCJZOYAtSKn+O6K52m8A PJ0zEOR4+1rXLW2c1O3aElMNSfeWyxPSET3I/bn78djq8rdfgCn20Ocw2RcCkaJJ y61JrctA92sv/zv/Ur9QCVVMbNn9f+r0JT5CVbSwbGcJ2oqmYEMejVnKqY4tjkFX 4vdDUFpELx8UuhiHoVL91zlxGntoEIrF1fUiVEgb2qWvY9PdLR9N3wBWIJUnYeFA kEP+s2VxyCsK6p5HGHymjui/WAdecJHODlEH8+RXbwplvI/MtBMqIwXshfa/AzLU /ZP3NutwcBs6wTDlC5LphzoEk38jSmOx5tufKyw982R1TyCdrga5xn1X3FWjB5oy 1cZxPHPW9OmZuyyC76SPn98KDjeuOJnCHv6x/XN07uo8bvcgXAlUBGxirWocy9Kx W822dWYao02Y7YRPYSR28T99t5fTZ/6nw05FYSzitPTJ5uOusl1ivj4W/wL/e6PZ E/oDpXtDfHoPzYE+HjxdK8NS08nnJTE7urn/M1z2IYDGX/Tu4rs= =RCku -----END PGP SIGNATURE----- --WlVl7eLDMKVyvfWUhS6y6TFezwOYpedLu--