mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 12:55:47 +07:00
c0842fbc1b
The addition of percpu.h to the list of includes in random.h revealed
some circular dependencies on arm64 and possibly other platforms. This
include was added solely for the pseudo-random definitions, which have
nothing to do with the rest of the definitions in this file but are
still there for legacy reasons.
This patch moves the pseudo-random parts to linux/prandom.h and the
percpu.h include with it, which is now guarded by _LINUX_PRANDOM_H and
protected against recursive inclusion.
A further cleanup step would be to remove this from <linux/random.h>
entirely, and make people who use the prandom infrastructure include
just the new header file. That's a bit of a churn patch, but grepping
for "prandom_" and "next_pseudo_random32" "struct rnd_state" should
catch most users.
But it turns out that that nice cleanup step is fairly painful, because
a _lot_ of code currently seems to depend on the implicit include of
<linux/random.h>, which can currently come in a lot of ways, including
such fairly core headfers as <linux/net.h>.
So the "nice cleanup" part may or may never happen.
Fixes: 1c9df907da ("random: fix circular include dependency on arm64 after addition of percpu.h")
Tested-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
162 lines
4.1 KiB
C
162 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* include/linux/random.h
|
|
*
|
|
* Include file for the random number generator.
|
|
*/
|
|
#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 random_ready_callback {
|
|
struct list_head list;
|
|
void (*func)(struct random_ready_callback *rdy);
|
|
struct module *owner;
|
|
};
|
|
|
|
extern void add_device_randomness(const void *, unsigned int);
|
|
extern void add_bootloader_randomness(const void *, unsigned int);
|
|
|
|
#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
|
|
|
|
extern void add_input_randomness(unsigned int type, unsigned int code,
|
|
unsigned int value) __latent_entropy;
|
|
extern void add_interrupt_randomness(int irq, int irq_flags) __latent_entropy;
|
|
|
|
extern void get_random_bytes(void *buf, int nbytes);
|
|
extern int wait_for_random_bytes(void);
|
|
extern int __init rand_initialize(void);
|
|
extern bool rng_is_initialized(void);
|
|
extern int add_random_ready_callback(struct random_ready_callback *rdy);
|
|
extern void del_random_ready_callback(struct random_ready_callback *rdy);
|
|
extern int __must_check get_random_bytes_arch(void *buf, int nbytes);
|
|
|
|
#ifndef MODULE
|
|
extern const struct file_operations random_fops, urandom_fops;
|
|
#endif
|
|
|
|
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)
|
|
{
|
|
unsigned long val = get_random_long();
|
|
|
|
return val & CANARY_MASK;
|
|
}
|
|
|
|
/* 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, int nbytes)
|
|
{
|
|
int ret = wait_for_random_bytes();
|
|
get_random_bytes(buf, nbytes);
|
|
return ret;
|
|
}
|
|
|
|
#define declare_get_random_var_wait(var) \
|
|
static inline int get_random_ ## var ## _wait(var *out) { \
|
|
int ret = wait_for_random_bytes(); \
|
|
if (unlikely(ret)) \
|
|
return ret; \
|
|
*out = get_random_ ## var(); \
|
|
return 0; \
|
|
}
|
|
declare_get_random_var_wait(u32)
|
|
declare_get_random_var_wait(u64)
|
|
declare_get_random_var_wait(int)
|
|
declare_get_random_var_wait(long)
|
|
#undef declare_get_random_var
|
|
|
|
unsigned long randomize_page(unsigned long start, unsigned long range);
|
|
|
|
/*
|
|
* 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
|
|
|
|
#endif /* _LINUX_RANDOM_H */
|