mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-27 12:57:53 +00:00
5ad7dd882e
randomize_page is an mm function. It is documented like one. It contains the history of one. It has the naming convention of one. It looks just like another very similar function in mm, randomize_stack_top(). And it has always been maintained and updated by mm people. There is no need for it to be in random.c. In the "which shape does not look like the other ones" test, pointing to randomize_page() is correct. So move randomize_page() into mm/util.c, right next to the similar randomize_stack_top() function. This commit contains no actual code changes. Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#ifndef _LINUX_RANDOM_H
|
|
#define _LINUX_RANDOM_H
|
|
|
|
#include <linux/bug.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/once.h>
|
|
|
|
#include <uapi/linux/random.h>
|
|
|
|
struct notifier_block;
|
|
|
|
void add_device_randomness(const void *buf, size_t len);
|
|
void add_bootloader_randomness(const void *buf, size_t len);
|
|
void add_input_randomness(unsigned int type, unsigned int code,
|
|
unsigned int value) __latent_entropy;
|
|
void add_interrupt_randomness(int irq) __latent_entropy;
|
|
void add_hwgenerator_randomness(const void *buf, size_t len, size_t entropy);
|
|
|
|
#if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
|
|
static inline void add_latent_entropy(void)
|
|
{
|
|
add_device_randomness((const void *)&latent_entropy, sizeof(latent_entropy));
|
|
}
|
|
#else
|
|
static inline void add_latent_entropy(void) { }
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_VMGENID)
|
|
void add_vmfork_randomness(const void *unique_vm_id, size_t len);
|
|
int register_random_vmfork_notifier(struct notifier_block *nb);
|
|
int unregister_random_vmfork_notifier(struct notifier_block *nb);
|
|
#else
|
|
static inline int register_random_vmfork_notifier(struct notifier_block *nb) { return 0; }
|
|
static inline int unregister_random_vmfork_notifier(struct notifier_block *nb) { return 0; }
|
|
#endif
|
|
|
|
void get_random_bytes(void *buf, size_t len);
|
|
u32 get_random_u32(void);
|
|
u64 get_random_u64(void);
|
|
static inline unsigned int get_random_int(void)
|
|
{
|
|
return get_random_u32();
|
|
}
|
|
static inline unsigned long get_random_long(void)
|
|
{
|
|
#if BITS_PER_LONG == 64
|
|
return get_random_u64();
|
|
#else
|
|
return get_random_u32();
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* On 64-bit architectures, protect against non-terminated C string overflows
|
|
* by zeroing out the first byte of the canary; this leaves 56 bits of entropy.
|
|
*/
|
|
#ifdef CONFIG_64BIT
|
|
# ifdef __LITTLE_ENDIAN
|
|
# define CANARY_MASK 0xffffffffffffff00UL
|
|
# else /* big endian, 64 bits: */
|
|
# define CANARY_MASK 0x00ffffffffffffffUL
|
|
# endif
|
|
#else /* 32 bits: */
|
|
# define CANARY_MASK 0xffffffffUL
|
|
#endif
|
|
|
|
static inline unsigned long get_random_canary(void)
|
|
{
|
|
return get_random_long() & CANARY_MASK;
|
|
}
|
|
|
|
int __init random_init(const char *command_line);
|
|
bool rng_is_initialized(void);
|
|
bool rng_has_arch_random(void);
|
|
int wait_for_random_bytes(void);
|
|
|
|
/* Calls wait_for_random_bytes() and then calls get_random_bytes(buf, nbytes).
|
|
* Returns the result of the call to wait_for_random_bytes. */
|
|
static inline int get_random_bytes_wait(void *buf, size_t nbytes)
|
|
{
|
|
int ret = wait_for_random_bytes();
|
|
get_random_bytes(buf, nbytes);
|
|
return ret;
|
|
}
|
|
|
|
#define declare_get_random_var_wait(name, ret_type) \
|
|
static inline int get_random_ ## name ## _wait(ret_type *out) { \
|
|
int ret = wait_for_random_bytes(); \
|
|
if (unlikely(ret)) \
|
|
return ret; \
|
|
*out = get_random_ ## name(); \
|
|
return 0; \
|
|
}
|
|
declare_get_random_var_wait(u32, u32)
|
|
declare_get_random_var_wait(u64, u32)
|
|
declare_get_random_var_wait(int, unsigned int)
|
|
declare_get_random_var_wait(long, unsigned long)
|
|
#undef declare_get_random_var
|
|
|
|
/*
|
|
* This is designed to be standalone for just prandom
|
|
* users, but for now we include it from <linux/random.h>
|
|
* for legacy reasons.
|
|
*/
|
|
#include <linux/prandom.h>
|
|
|
|
#ifdef CONFIG_ARCH_RANDOM
|
|
# include <asm/archrandom.h>
|
|
#else
|
|
static inline bool __must_check arch_get_random_long(unsigned long *v) { return false; }
|
|
static inline bool __must_check arch_get_random_int(unsigned int *v) { return false; }
|
|
static inline bool __must_check arch_get_random_seed_long(unsigned long *v) { return false; }
|
|
static inline bool __must_check arch_get_random_seed_int(unsigned int *v) { return false; }
|
|
#endif
|
|
|
|
/*
|
|
* Called from the boot CPU during startup; not valid to call once
|
|
* secondary CPUs are up and preemption is possible.
|
|
*/
|
|
#ifndef arch_get_random_seed_long_early
|
|
static inline bool __init arch_get_random_seed_long_early(unsigned long *v)
|
|
{
|
|
WARN_ON(system_state != SYSTEM_BOOTING);
|
|
return arch_get_random_seed_long(v);
|
|
}
|
|
#endif
|
|
|
|
#ifndef arch_get_random_long_early
|
|
static inline bool __init arch_get_random_long_early(unsigned long *v)
|
|
{
|
|
WARN_ON(system_state != SYSTEM_BOOTING);
|
|
return arch_get_random_long(v);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
int random_prepare_cpu(unsigned int cpu);
|
|
int random_online_cpu(unsigned int cpu);
|
|
#endif
|
|
|
|
#ifndef MODULE
|
|
extern const struct file_operations random_fops, urandom_fops;
|
|
#endif
|
|
|
|
#endif /* _LINUX_RANDOM_H */
|