nathan/Chromebook-Device-Nyan-NVIDIA-Tegra-K1-T124-Upstream-Linux-3.10-LTS-Kernel
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Applied assortment of Arch Linux ARM patches

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Nathan
2025-04-07 00:16:08 -05:00
parent 25c6d769f4
commit 4822424518
39 changed files with 419 additions and 275 deletions
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2
lib/decompress_unlzo.c
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@@ -51,7 +51,7 @@ static const unsigned char lzop_magic[] = {
#define HEADER_SIZE_MIN (9 + 7 + 4 + 8 + 1 + 4)
#define HEADER_SIZE_MAX (9 + 7 + 1 + 8 + 8 + 4 + 1 + 255 + 4)
STATIC inline int INIT parse_header(u8 *input, int *skip, int in_len)
static inline int INIT parse_header(u8 *input, int *skip, int in_len)
{
int l;
u8 *parse = input;

61
lib/random32.c
View File

@@ -38,6 +38,7 @@
#include <linux/export.h>
#include <linux/jiffies.h>
#include <linux/random.h>
#include <linux/timer.h>
static DEFINE_PER_CPU(struct rnd_state, net_rand_state);
@@ -141,7 +142,8 @@ void prandom_seed(u32 entropy)
*/
for_each_possible_cpu (i) {
struct rnd_state *state = &per_cpu(net_rand_state, i);
state->s1 = __seed(state->s1 ^ entropy, 1);
state->s1 = __seed(state->s1 ^ entropy, 2);
prandom_u32_state(state);
}
}
EXPORT_SYMBOL(prandom_seed);
@@ -158,9 +160,9 @@ static int __init prandom_init(void)
struct rnd_state *state = &per_cpu(net_rand_state,i);
#define LCG(x) ((x) * 69069) /* super-duper LCG */
state->s1 = __seed(LCG(i + jiffies), 1);
state->s2 = __seed(LCG(state->s1), 7);
state->s3 = __seed(LCG(state->s2), 15);
state->s1 = __seed(LCG(i + jiffies), 2);
state->s2 = __seed(LCG(state->s1), 8);
state->s3 = __seed(LCG(state->s2), 16);
/* "warm it up" */
prandom_u32_state(state);
@@ -174,26 +176,69 @@ static int __init prandom_init(void)
}
core_initcall(prandom_init);
static void __prandom_timer(unsigned long dontcare);
static DEFINE_TIMER(seed_timer, __prandom_timer, 0, 0);
static void __prandom_timer(unsigned long dontcare)
{
u32 entropy;
get_random_bytes(&entropy, sizeof(entropy));
prandom_seed(entropy);
/* reseed every ~60 seconds, in [40 .. 80) interval with slack */
seed_timer.expires = jiffies + (40 * HZ + (prandom_u32() % (40 * HZ)));
add_timer(&seed_timer);
}
static void prandom_start_seed_timer(void)
{
set_timer_slack(&seed_timer, HZ);
seed_timer.expires = jiffies + 40 * HZ;
add_timer(&seed_timer);
}
/*
* Generate better values after random number generator
* is fully initialized.
*/
static int __init prandom_reseed(void)
static void __prandom_reseed(bool late)
{
int i;
unsigned long flags;
static bool latch = false;
static DEFINE_SPINLOCK(lock);
/* only allow initial seeding (late == false) once */
spin_lock_irqsave(&lock, flags);
if (latch && !late)
goto out;
latch = true;
for_each_possible_cpu(i) {
struct rnd_state *state = &per_cpu(net_rand_state,i);
u32 seeds[3];
get_random_bytes(&seeds, sizeof(seeds));
state->s1 = __seed(seeds[0], 1);
state->s2 = __seed(seeds[1], 7);
state->s3 = __seed(seeds[2], 15);
state->s1 = __seed(seeds[0], 2);
state->s2 = __seed(seeds[1], 8);
state->s3 = __seed(seeds[2], 16);
/* mix it in */
prandom_u32_state(state);
}
out:
spin_unlock_irqrestore(&lock, flags);
}
void prandom_reseed_late(void)
{
__prandom_reseed(true);
}
static int __init prandom_reseed(void)
{
__prandom_reseed(false);
prandom_start_seed_timer();
return 0;
}
late_initcall(prandom_reseed);