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[173.79.56.208]) by smtp.gmail.com with ESMTPSA id mx5-20020a0562142e0500b005dd8b9345desm110761qvb.118.2023.03.30.14.21.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Mar 2023 14:21:45 -0700 (PDT) From: Gregory Price X-Google-Original-From: Gregory Price To: linux-kernel@vger.kernel.org Cc: linux-doc@vger.kernel.org, linux-arch@vger.kernel.org, oleg@redhat.com, avagin@gmail.com, peterz@infradead.org, luto@kernel.org, krisman@collabora.com, tglx@linutronix.de, corbet@lwn.net, shuah@kernel.org, catalin.marinas@arm.com, arnd@arndb.de, Gregory Price Subject: [PATCH v15 1/4] syscall_user_dispatch: helper function to operate on given task Date: Thu, 30 Mar 2023 17:21:20 -0400 Message-Id: <20230330212121.1688-2-gregory.price@memverge.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230330212121.1688-1-gregory.price@memverge.com> References: <20230330212121.1688-1-gregory.price@memverge.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Preparatory patch ahead of set/get interfaces which will allow a ptrace to get/set the syscall user dispatch configuration of a task. This will simplify the set interface and consolidates error paths. Signed-off-by: Gregory Price Reviewed-by: Oleg Nesterov --- kernel/entry/syscall_user_dispatch.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/kernel/entry/syscall_user_dispatch.c b/kernel/entry/syscall_user_dispatch.c index 0b6379adff6b..22396b234854 100644 --- a/kernel/entry/syscall_user_dispatch.c +++ b/kernel/entry/syscall_user_dispatch.c @@ -68,8 +68,9 @@ bool syscall_user_dispatch(struct pt_regs *regs) return true; } -int set_syscall_user_dispatch(unsigned long mode, unsigned long offset, - unsigned long len, char __user *selector) +static int task_set_syscall_user_dispatch(struct task_struct *task, unsigned long mode, + unsigned long offset, unsigned long len, + char __user *selector) { switch (mode) { case PR_SYS_DISPATCH_OFF: @@ -94,15 +95,21 @@ int set_syscall_user_dispatch(unsigned long mode, unsigned long offset, return -EINVAL; } - current->syscall_dispatch.selector = selector; - current->syscall_dispatch.offset = offset; - current->syscall_dispatch.len = len; - current->syscall_dispatch.on_dispatch = false; + task->syscall_dispatch.selector = selector; + task->syscall_dispatch.offset = offset; + task->syscall_dispatch.len = len; + task->syscall_dispatch.on_dispatch = false; if (mode == PR_SYS_DISPATCH_ON) - set_syscall_work(SYSCALL_USER_DISPATCH); + set_task_syscall_work(task, SYSCALL_USER_DISPATCH); else - clear_syscall_work(SYSCALL_USER_DISPATCH); + clear_task_syscall_work(task, SYSCALL_USER_DISPATCH); return 0; } + +int set_syscall_user_dispatch(unsigned long mode, unsigned long offset, + unsigned long len, char __user *selector) +{ + return task_set_syscall_user_dispatch(current, mode, offset, len, selector); +} -- 2.39.1