diff options
Diffstat (limited to 'src/cpu/x86/smm/smm_module_handler.c')
| -rw-r--r-- | src/cpu/x86/smm/smm_module_handler.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/cpu/x86/smm/smm_module_handler.c b/src/cpu/x86/smm/smm_module_handler.c index c2001ec9e2..6dff9411de 100644 --- a/src/cpu/x86/smm/smm_module_handler.c +++ b/src/cpu/x86/smm/smm_module_handler.c @@ -122,10 +122,13 @@ asmlinkage void smm_handler_start(void *arg) const struct smm_module_params *p; const struct smm_runtime *runtime; int cpu; + uintptr_t actual_canary; + uintptr_t expected_canary; p = arg; runtime = p->runtime; cpu = p->cpu; + expected_canary = (uintptr_t)p->canary; /* Make sure to set the global runtime. It's OK to race as the value * will be the same across CPUs as well as multiple SMIs. */ @@ -171,6 +174,17 @@ asmlinkage void smm_handler_start(void *arg) smi_restore_pci_address(); + actual_canary = *p->canary; + + if (actual_canary != expected_canary) { + printk(BIOS_DEBUG, "canary 0x%lx != 0x%lx\n", actual_canary, + expected_canary); + + // Don't die if we can't indicate an error. + if (IS_ENABLED(CONFIG_DEBUG_SMI)) + die("SMM Handler caused a stack overflow\n"); + } + smi_release_lock(); /* De-assert SMI# signal to allow another SMI */ |