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Sun, 8 Apr 2018 20:37:40 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Dave Martin , Will Deacon , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 091/162] arm64: ptrace: Fix incorrect get_user() use in compat_vfp_set() Thread-Topic: [PATCH AUTOSEL for 4.4 091/162] arm64: ptrace: Fix incorrect get_user() use in compat_vfp_set() Thread-Index: AQHTz5m7WV/WP7Q+FEy1WfSfCQyAmw== Date: Mon, 9 Apr 2018 00:28:50 +0000 Message-ID: <20180409002738.163941-91-alexander.levin@microsoft.com> References: <20180409002738.163941-1-alexander.levin@microsoft.com> In-Reply-To: <20180409002738.163941-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1031;7:LbvF8G003+ZAKzSE9bl8BZcBHK/inbHKMht26wiNfEjOZ8S/poBdrT/J/gsMuze8XDbPbuG6EEHjVgRDrkrPtygjkWIlDENjpwxVptX+Sp3fHR4gzpuBc3YoSGWexYyGyc5BNubjqUZ9ElMZ/fQHoeQTQsEHSTgcM4zvxpq0T3cQy+XB8cgWZ6PD/5LBPLNJn2WIXUrEmNdvDL628amnhOYwMJtKFmd2/NOo3l9qry9B6cVIfUfZYKkn16PAvpGB;20:T51gm/VqXrSqX+nQWOZwA+G9GG84IrVZGT8rhPLJOglVelZYMGIOlemV1NX5wvYlATGJQhk5u/a53vGNkKdIUD0lWqFzdBUjgLVd5n7P/EQj2E0hCATtpIgbn3HEF64Mm77aljZSF3qpqMTDkXBsmYCDrWqIBrdtye0oWykGct0= x-ms-office365-filtering-ht: Tenant X-MS-Office365-Filtering-Correlation-Id: be7a7a8b-41bb-4c1d-ade3-08d59db218a6 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1031; 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x-microsoft-antispam-message-info: rMEpHUP6az/HMJuM3hv4ZBB+JqN4e1sFt5daxnleEcMIJfg0O2GXwkMujTpr11WTQfjbSx1M9cFJ70zFaRKaFVv1iSU4rWMPSTvoprgcgs/8vaOJ2724CNZpQDg7E7S1wjgPFIIpFQy5jc1aTO1MS8KdPLlgqq60hvlygHHasSkeYgq0bjaKENpfIVqblw/IDofHory7c8f4DoapR3sPX1eDmJjoh8Xt7FwFuC5yq5RfCHB609oqWZbclCwNGBjVwD8XZj/1prAPweraPFdJuPn9YPBCIyBvXpDXqmxalJpQMNl6KlMHX7Ynhg5OhPz6SHvjELgIPH4fpvcSNUloyFAG3uKpRq0Kqn1kQZA+UL5rebY0uhWmALEgWbTc0SwCiMjhfnEUye7vgkRqFjOnEB2gXA7bJCJBwarxfUqHXcY= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: be7a7a8b-41bb-4c1d-ade3-08d59db218a6 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:28:50.8646 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1031 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Dave Martin [ Upstream commit 5fbd5fc49fc39ac8433da62d16682a1d0217ea4f ] Now that compat_vfp_get() uses the regset API to copy the FPSCR value out to userspace, compat_vfp_set() looks inconsistent. In particular, compat_vfp_set() will fail if called with kbuf !=3D NULL && ubuf =3D=3D NULL (which is valid usage according to the regset API). This patch fixes compat_vfp_set() to use user_regset_copyin(), similarly to compat_vfp_get(). This also squashes a sparse warning triggered by the cast that drops __user when calling get_user(). Signed-off-by: Dave Martin Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- arch/arm64/kernel/ptrace.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index b81fa63bc834..f67bb64d2640 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -822,18 +822,20 @@ static int compat_vfp_set(struct task_struct *target, { struct user_fpsimd_state *uregs; compat_ulong_t fpscr; - int ret; + int ret, vregs_end_pos; =20 if (pos + count > VFP_STATE_SIZE) return -EIO; =20 uregs =3D &target->thread.fpsimd_state.user_fpsimd; =20 + vregs_end_pos =3D VFP_STATE_SIZE - sizeof(compat_ulong_t); ret =3D user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0, - VFP_STATE_SIZE - sizeof(compat_ulong_t)); + vregs_end_pos); =20 if (count && !ret) { - ret =3D get_user(fpscr, (compat_ulong_t *)ubuf); + ret =3D user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpscr, + vregs_end_pos, VFP_STATE_SIZE); if (!ret) { uregs->fpsr =3D fpscr & VFP_FPSCR_STAT_MASK; uregs->fpcr =3D fpscr & VFP_FPSCR_CTRL_MASK; --=20 2.15.1