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| 1 | /* Internal representation of tunables. |
|---|---|
| 2 | |
| 3 | Copyright (C) 2016-2022 Free Software Foundation, Inc. |
| 4 | This file is part of the GNU C Library. |
| 5 | |
| 6 | The GNU C Library is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Lesser General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2.1 of the License, or (at your option) any later version. |
| 10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Lesser General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; if not, see |
| 18 | <https://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #ifndef _TUNABLE_TYPES_H_ |
| 21 | #define _TUNABLE_TYPES_H_ |
| 22 | |
| 23 | /* Note: This header is included in the generated dl-tunables-list.h and |
| 24 | only used internally in the tunables implementation in dl-tunables.c. */ |
| 25 | |
| 26 | #include <stdbool.h> |
| 27 | #include <stddef.h> |
| 28 | #include <stdint.h> |
| 29 | |
| 30 | typedef enum |
| 31 | { |
| 32 | TUNABLE_TYPE_INT_32, |
| 33 | TUNABLE_TYPE_UINT_64, |
| 34 | TUNABLE_TYPE_SIZE_T, |
| 35 | TUNABLE_TYPE_STRING |
| 36 | } tunable_type_code_t; |
| 37 | |
| 38 | typedef struct |
| 39 | { |
| 40 | tunable_type_code_t type_code; |
| 41 | tunable_num_t min; |
| 42 | tunable_num_t max; |
| 43 | } tunable_type_t; |
| 44 | |
| 45 | /* Security level for tunables. This decides what to do with individual |
| 46 | tunables for AT_SECURE binaries. */ |
| 47 | typedef enum |
| 48 | { |
| 49 | /* Erase the tunable for AT_SECURE binaries so that child processes don't |
| 50 | read it. */ |
| 51 | TUNABLE_SECLEVEL_SXID_ERASE = 0, |
| 52 | /* Ignore the tunable for AT_SECURE binaries, but don't erase it, so that |
| 53 | child processes can read it. */ |
| 54 | TUNABLE_SECLEVEL_SXID_IGNORE = 1, |
| 55 | /* Read the tunable. */ |
| 56 | TUNABLE_SECLEVEL_NONE = 2, |
| 57 | } tunable_seclevel_t; |
| 58 | |
| 59 | /* A tunable. */ |
| 60 | struct _tunable |
| 61 | { |
| 62 | const char name[TUNABLE_NAME_MAX]; /* Internal name of the tunable. */ |
| 63 | tunable_type_t type; /* Data type of the tunable. */ |
| 64 | tunable_val_t val; /* The value. */ |
| 65 | bool initialized; /* Flag to indicate that the tunable is |
| 66 | initialized. */ |
| 67 | tunable_seclevel_t security_level; /* Specify the security level for the |
| 68 | tunable with respect to AT_SECURE |
| 69 | programs. See description of |
| 70 | tunable_seclevel_t to see a |
| 71 | description of the values. |
| 72 | |
| 73 | Note that even if the tunable is |
| 74 | read, it may not get used by the |
| 75 | target module if the value is |
| 76 | considered unsafe. */ |
| 77 | /* Compatibility elements. */ |
| 78 | const char env_alias[TUNABLE_ALIAS_MAX]; /* The compatibility environment |
| 79 | variable name. */ |
| 80 | }; |
| 81 | |
| 82 | typedef struct _tunable tunable_t; |
| 83 | |
| 84 | static __always_inline bool |
| 85 | unsigned_tunable_type (tunable_type_code_t t) |
| 86 | { |
| 87 | switch (t) |
| 88 | { |
| 89 | case TUNABLE_TYPE_INT_32: |
| 90 | return false; |
| 91 | case TUNABLE_TYPE_UINT_64: |
| 92 | case TUNABLE_TYPE_SIZE_T: |
| 93 | return true; |
| 94 | case TUNABLE_TYPE_STRING: |
| 95 | default: |
| 96 | break; |
| 97 | } |
| 98 | __builtin_unreachable (); |
| 99 | } |
| 100 | |
| 101 | #endif |
| 102 |
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