Merge pull request #28527 from medhefgo/boot-stack-guard

boot: Fall back to using image load address for stack guard
2023-07-28 09:56:41 +01:00
parent de06b9a1b9 bc32a9fdfd
commit 80256e8c54
1 changed files with 3 additions and 0 deletions
@@ -79,6 +79,9 @@ void __stack_chk_guard_init(void) {
        EFI_RNG_PROTOCOL *rng;
        if (BS->LocateProtocol(MAKE_GUID_PTR(EFI_RNG_PROTOCOL), NULL, (void **) &rng) == EFI_SUCCESS)
                (void) rng->GetRNG(rng, NULL, sizeof(__stack_chk_guard), (void *) &__stack_chk_guard);
+        else
+                /* Better than no extra entropy. */
+                __stack_chk_guard ^= (intptr_t) &__ImageBase;
 }
 #endif