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boot: Fall back to using image load address for stack guard

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If we cannot get random data from the RNG protocol we can still use our
load address to make the stack guard a little less static.
This commit is contained in:
Jan Janssen 2023-07-26 15:08:53 +02:00
parent 99aa03c3af
commit bc32a9fdfd
1 changed files with 3 additions and 0 deletions
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3
src/boot/efi/log.c
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@ -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