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Merge pull request #15548 from unknownbrackets/crash-alignment

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Crash: Recover from unaligned CPU access
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Henrik Rydgård 2022-05-22 17:36:17 +02:00 committed by GitHub
commit 957c37b63f
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1 changed files with 4 additions and 2 deletions
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Core/MemFault.cpp
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@ -111,15 +111,17 @@ bool HandleFault(uintptr_t hostAddress, void *ctx) {
#endif
// Check whether hostAddress is within the PSP memory space, which (likely) means it was a guest executable that did the bad access.
bool invalidHostAddress = hostAddress == (uintptr_t)0xFFFFFFFFFFFFFFFFULL;
if (hostAddress < baseAddress || hostAddress >= baseAddress + addressSpaceSize) {
// Host address outside - this was a different kind of crash.
if (!invalidHostAddress)
return false;
}
// OK, a guest executable did a bad access. Take care of it.
uint32_t guestAddress = (uint32_t)(hostAddress - baseAddress);
uint32_t guestAddress = invalidHostAddress ? 0xFFFFFFFFUL : (uint32_t)(hostAddress - baseAddress);
// TODO: Share the struct between the various analyzers, that will allow us to share most of
// the implementations here.