mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 13:13:43 +08:00
d1a3dcabf2
The simplification of tunable_set interfaces took care of signed/unsigned conversions while setting values, but comparison with bounds ended up being incorrect; comparing TUNABLE_SIZE_T values for example will fail because SIZE_MAX is seen as -1. Add comparison helpers that take tunable types into account and use them to do comparison instead.
102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/* Internal representation of tunables.
|
|
|
|
Copyright (C) 2016-2021 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _TUNABLE_TYPES_H_
|
|
#define _TUNABLE_TYPES_H_
|
|
|
|
/* Note: This header is included in the generated dl-tunables-list.h and
|
|
only used internally in the tunables implementation in dl-tunables.c. */
|
|
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
typedef enum
|
|
{
|
|
TUNABLE_TYPE_INT_32,
|
|
TUNABLE_TYPE_UINT_64,
|
|
TUNABLE_TYPE_SIZE_T,
|
|
TUNABLE_TYPE_STRING
|
|
} tunable_type_code_t;
|
|
|
|
typedef struct
|
|
{
|
|
tunable_type_code_t type_code;
|
|
tunable_num_t min;
|
|
tunable_num_t max;
|
|
} tunable_type_t;
|
|
|
|
/* Security level for tunables. This decides what to do with individual
|
|
tunables for AT_SECURE binaries. */
|
|
typedef enum
|
|
{
|
|
/* Erase the tunable for AT_SECURE binaries so that child processes don't
|
|
read it. */
|
|
TUNABLE_SECLEVEL_SXID_ERASE = 0,
|
|
/* Ignore the tunable for AT_SECURE binaries, but don't erase it, so that
|
|
child processes can read it. */
|
|
TUNABLE_SECLEVEL_SXID_IGNORE = 1,
|
|
/* Read the tunable. */
|
|
TUNABLE_SECLEVEL_NONE = 2,
|
|
} tunable_seclevel_t;
|
|
|
|
/* A tunable. */
|
|
struct _tunable
|
|
{
|
|
const char name[TUNABLE_NAME_MAX]; /* Internal name of the tunable. */
|
|
tunable_type_t type; /* Data type of the tunable. */
|
|
tunable_val_t val; /* The value. */
|
|
bool initialized; /* Flag to indicate that the tunable is
|
|
initialized. */
|
|
tunable_seclevel_t security_level; /* Specify the security level for the
|
|
tunable with respect to AT_SECURE
|
|
programs. See description of
|
|
tunable_seclevel_t to see a
|
|
description of the values.
|
|
|
|
Note that even if the tunable is
|
|
read, it may not get used by the
|
|
target module if the value is
|
|
considered unsafe. */
|
|
/* Compatibility elements. */
|
|
const char env_alias[TUNABLE_ALIAS_MAX]; /* The compatibility environment
|
|
variable name. */
|
|
};
|
|
|
|
typedef struct _tunable tunable_t;
|
|
|
|
static __always_inline bool
|
|
unsigned_tunable_type (tunable_type_code_t t)
|
|
{
|
|
switch (t)
|
|
{
|
|
case TUNABLE_TYPE_INT_32:
|
|
return false;
|
|
case TUNABLE_TYPE_UINT_64:
|
|
case TUNABLE_TYPE_SIZE_T:
|
|
return true;
|
|
case TUNABLE_TYPE_STRING:
|
|
default:
|
|
break;
|
|
}
|
|
__builtin_unreachable ();
|
|
}
|
|
|
|
#endif
|