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kernel: thread: Fix randomness problem with stack pointer random

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In some platforms the size of size_t can be different of 4 bytes. Use
sys_rand_get to proper fill this variable.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
This commit is contained in:
Flavio Ceolin 2019-11-12 15:50:20 -08:00 • committed by Andrew Boie
commit 91fd6d0866
4 changed files with 9 additions and 17 deletions
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2
kernel/include/kernel_internal.h
View file

@ -112,7 +112,7 @@ extern void z_smp_init(void);
extern void smp_timer_init(void);
extern u32_t z_early_boot_rand32_get(void);
extern void z_early_boot_rand_get(u8_t *buf, size_t length);
#if CONFIG_STACK_POINTER_RANDOM
extern int z_stack_adjust_initialized;

11
kernel/init.c
View file

@ -426,7 +426,7 @@ static FUNC_NORETURN void switch_to_main_thread(void)
}
#endif /* CONFIG_MULTITHREADING */
static void z_early_boot_rand_get(u8_t *buf, size_t length)
void z_early_boot_rand_get(u8_t *buf, size_t length)
{
int n = sizeof(u32_t);
#ifdef CONFIG_ENTROPY_HAS_DRIVER
@ -482,15 +482,6 @@ sys_rand_fallback:
}
}
u32_t z_early_boot_rand32_get(void)
{
u32_t retval;
z_early_boot_rand_get((u8_t *)&retval, sizeof(retval));
return retval;
}
/**
*
* @brief Initialize kernel

4
kernel/thread.c
View file

@ -403,9 +403,9 @@ static inline size_t adjust_stack_size(size_t stack_size)
size_t random_val;
if (!z_stack_adjust_initialized) {
random_val = z_early_boot_rand32_get();
z_early_boot_rand_get((u8_t *)&random_val, sizeof(random_val));
} else {
random_val = sys_rand32_get();
sys_rand_get((u8_t *)&random_val, sizeof(random_val));
}
/* Don't need to worry about alignment of the size here,

9
tests/crypto/rand32/src/main.c
View file

@ -8,7 +8,7 @@
/*
* This tests the following random number routines:
* u32_t z_early_boot_rand32_get(void);
* void z_early_boot_rand_get(u8_t *buf, size_t length)
* u32_t sys_rand32_get(void);
*/
@ -35,9 +35,10 @@ void test_rand32(void)
u32_t buf[N_VALUES];
/* Test early boot random number generation function */
last_gen = z_early_boot_rand32_get();
zassert_true(last_gen != z_early_boot_rand32_get(),
"z_early_boot_rand32_get failed");
z_early_boot_rand_get((u8_t *)&last_gen, sizeof(last_gen));
z_early_boot_rand_get((u8_t *)&gen, sizeof(gen));
zassert_true(last_gen != gen,
"z_early_boot_rand_get failed");
/*
* Test subsequently calls sys_rand32_get(), checking