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Remove guard-page from main thread stack

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This was erroneously included while migrating from older code where stack creation was entirely handled with host constructs such as `mmap` directly to using `KPrivateMemory` to manage it, we would create a guard page with `mprotect` that the guest was unaware about and would cause a segfault when a guest accessed the extents of the stack as reported to the guest.
This commit is contained in:
PixelyIon 2022-04-09 16:23:02 +05:30
parent de81d28b1d
commit ad0005f398
1 changed files with 0 additions and 2 deletions
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app/src/main/cpp/skyline/kernel/types/KProcess.cpp
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@ -70,8 +70,6 @@ namespace skyline::kernel::type {
return nullptr; return nullptr;
if (!stackTop && threads.empty()) { //!< Main thread stack is created by the kernel and owned by the process if (!stackTop && threads.empty()) { //!< Main thread stack is created by the kernel and owned by the process
mainThreadStack = std::make_shared<KPrivateMemory>(state, reinterpret_cast<u8 *>(state.process->memory.stack.address), state.process->npdm.meta.mainThreadStackSize, memory::Permission{true, true, false}, memory::states::Stack); mainThreadStack = std::make_shared<KPrivateMemory>(state, reinterpret_cast<u8 *>(state.process->memory.stack.address), state.process->npdm.meta.mainThreadStackSize, memory::Permission{true, true, false}, memory::states::Stack);
if (mprotect(mainThreadStack->ptr, PAGE_SIZE, PROT_NONE))
throw exception("Failed to create guard page for thread stack at 0x{:X}", mainThreadStack->ptr);
stackTop = mainThreadStack->ptr + mainThreadStack->size; stackTop = mainThreadStack->ptr + mainThreadStack->size;
} }
auto thread{NewHandle<KThread>(this, threads.size(), entry, argument, stackTop, priority ? *priority : state.process->npdm.meta.mainThreadPriority, idealCore ? *idealCore : state.process->npdm.meta.idealCore).item}; auto thread{NewHandle<KThread>(this, threads.size(), entry, argument, stackTop, priority ? *priority : state.process->npdm.meta.mainThreadPriority, idealCore ? *idealCore : state.process->npdm.meta.idealCore).item};