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Fri, 16 Apr 2021 07:55:57 +0000 From: He Zhe To: oleg@redhat.com, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, paul@paul-moore.com, eparis@redhat.com, linux-audit@redhat.com, linux-kernel@vger.kernel.org, zhe.he@windriver.com Subject: [PATCH 2/3] arm64: syscall.h: Add sign extension handling in syscall_get_return_value for compat Date: Fri, 16 Apr 2021 15:55:32 +0800 Message-Id: <20210416075533.7720-2-zhe.he@windriver.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210416075533.7720-1-zhe.he@windriver.com> References: <20210416075533.7720-1-zhe.he@windriver.com> X-Originating-IP: [60.247.85.82] X-ClientProxiedBy: HK2PR04CA0064.apcprd04.prod.outlook.com (2603:1096:202:14::32) To MWHPR1101MB2351.namprd11.prod.outlook.com (2603:10b6:300:74::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from pek-lpg-core2.corp.ad.wrs.com (60.247.85.82) by HK2PR04CA0064.apcprd04.prod.outlook.com (2603:1096:202:14::32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4042.16 via Frontend Transport; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add sign extension handling in syscall_get_return_value so that it can handle 32-bit compatible case and can be used by for example audit, just like what syscall_get_error does. Signed-off-by: He Zhe --- arch/arm64/include/asm/syscall.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h index cfc0672013f6..cd7a22787aeb 100644 --- a/arch/arm64/include/asm/syscall.h +++ b/arch/arm64/include/asm/syscall.h @@ -44,7 +44,12 @@ static inline long syscall_get_error(struct task_struct *task, static inline long syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) { - return regs->regs[0]; + long val = regs->regs[0]; + + if (is_compat_thread(task_thread_info(task))) + val = sign_extend64(val, 31); + + return val; } static inline void syscall_set_return_value(struct task_struct *task,