projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 9f36eaed MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
| 2 | * | |
| 7b8ea3a5 MD |
3 | * lttng-probe-user.h |
| 4 | * | |
| 5 | * Copyright (C) 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 7b8ea3a5 MD |
6 | */ |
| 7 | ||
| 9f36eaed MJ |
8 | #ifndef _LTTNG_PROBE_USER_H |
| 9 | #define _LTTNG_PROBE_USER_H | |
| 10 | ||
| 6423140f MD |
11 | #include <wrapper/uaccess.h> |
| 12 | ||
| 7b8ea3a5 MD |
13 | /* |
| 14 | * Calculate string length. Include final null terminating character if there is | |
| 15 | * one, or ends at first fault. | |
| 16 | */ | |
| 17 | long lttng_strlen_user_inatomic(const char *addr); | |
| 18 | ||
| 6423140f MD |
19 | /* |
| 20 | * We use __copy_from_user_inatomic to copy userspace data after | |
| 21 | * checking with access_ok() and disabling page faults. | |
| 22 | * | |
| 23 | * Return 0 if OK, nonzero on error. | |
| 24 | */ | |
| 25 | static inline | |
| 26 | unsigned long lttng_copy_from_user_check_nofault(void *dest, | |
| 27 | const void __user *src, | |
| 28 | unsigned long len) | |
| 29 | { | |
| 30 | unsigned long ret; | |
| 31 | ||
| 32 | if (!lttng_access_ok(VERIFY_READ, src, len)) | |
| 33 | return 1; | |
| 34 | pagefault_disable(); | |
| 35 | ret = __copy_from_user_inatomic(dest, src, len); | |
| 36 | pagefault_enable(); | |
| 37 | return ret; | |
| 38 | } | |
| 39 | ||
| 7b8ea3a5 | 40 | #endif /* _LTTNG_PROBE_USER_H */ |