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linuxkm: wolfcrypt/src/memory.c: in {save,restore}_vector_registers_x86(), allow for recursive calls (some crypto calls are recursive).

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This commit is contained in:
Daniel Pouzzner
2021-10-18 23:34:35 -05:00
parent fc73c6dbea
commit ad4c200cd2
1 changed files with 14 additions and 10 deletions
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24
wolfcrypt/src/memory.c
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@ -1241,16 +1241,18 @@ union fpregs_state **wolfcrypt_irq_fpu_states = NULL;
return BAD_STATE_E;
}
/* check for nested interrupts -- doesn't exist on x86, but make
* sure, in case something changes.
*/
if (((char *)wolfcrypt_irq_fpu_states[processor_id])[PAGE_SIZE-1] != 0) {
preempt_enable();
pr_err("save_vector_registers_x86 called recursively for "
"cpu id %d.\n", processor_id);
return BAD_STATE_E;
/* allow for recursive calls (some crypto calls are recursive) */
if (((unsigned char *)wolfcrypt_irq_fpu_states[processor_id])[PAGE_SIZE-1] != 0) {
if (((unsigned char *)wolfcrypt_irq_fpu_states[processor_id])[PAGE_SIZE-1] == 255) {
preempt_enable();
pr_err("save_vector_registers_x86 recursion register overflow for "
"cpu id %d.\n", processor_id);
return BAD_STATE_E;
} else {
++((char *)wolfcrypt_irq_fpu_states[processor_id])[PAGE_SIZE-1];
return 0;
}
}
/* note, fpregs_lock() is not needed here, because
* interrupts/preemptions are already disabled here.
*/
@ -1292,12 +1294,14 @@ union fpregs_state **wolfcrypt_irq_fpu_states = NULL;
int processor_id = __smp_processor_id();
if ((wolfcrypt_irq_fpu_states == NULL) ||
(wolfcrypt_irq_fpu_states[processor_id] == NULL) ||
(((char *)wolfcrypt_irq_fpu_states[processor_id])[PAGE_SIZE-1] == 0))
(((unsigned char *)wolfcrypt_irq_fpu_states[processor_id])[PAGE_SIZE-1] == 0))
{
pr_err("restore_vector_registers_x86 called for cpu id %d "
"without saved context.\n", processor_id);
preempt_enable(); /* just in case */
return;
} else if (--((unsigned char *)wolfcrypt_irq_fpu_states[processor_id])[PAGE_SIZE-1] > 0) {
return;
} else {
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 14, 0)
copy_kernel_to_fpregs(wolfcrypt_irq_fpu_states[processor_id]);