984bfae831
Remove leading/trailing blank lines in .c, .h, .py, .rst, .yml, and .yaml files. Will avoid failures with the new CI test in https://github.com/zephyrproject-rtos/ci-tools/pull/112, though it only checks changed files. Move the 'target-notes' target in boards/xtensa/odroid_go/doc/index.rst to get rid of the trailing blank line there. It was probably misplaced. Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/*
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* Copyright (c) 2019 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <syscall_handler.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(app_syscall);
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/* Implementation of magic_syscall() which is a system call just for this
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* application, not part of the kernel codebase.
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*
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* It's trivial, update the supplied cookie value by 1, only if it is less than
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* 42. This is just for demonstration purposes to show how syscalls can be
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* defined in application code.
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*/
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int z_impl_magic_syscall(unsigned int *cookie)
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{
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LOG_DBG("magic syscall: got a cookie %u", *cookie);
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if (*cookie > 42) {
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LOG_ERR("bad cookie :(");
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return -EINVAL;
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}
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*cookie = *cookie + 1;
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return 0;
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}
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static int z_vrfy_magic_syscall(unsigned int *cookie)
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{
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unsigned int cookie_copy;
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int ret;
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/* Confirm that this user-supplied pointer is valid memory that
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* can be accessed. If it's OK, copy into cookie_copy.
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*/
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if (z_user_from_copy(&cookie_copy, cookie, sizeof(*cookie)) != 0) {
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return -EPERM;
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}
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/* We pass to the implementation the *copy*, to prevent TOCTOU attacks
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*/
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ret = z_impl_magic_syscall(&cookie_copy);
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if (ret == 0 &&
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z_user_to_copy(cookie, &cookie_copy, sizeof(*cookie)) != 0) {
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return -EPERM;
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}
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return ret;
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}
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#include <syscalls/magic_syscall_mrsh.c>
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