OmniNX/Atmosphere
0
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 1 Wiki Activity

kern: finish shadow stack region, 64k page process segregation implementation, fix some long-standing issues

Browse Source
This commit is contained in:
Alula
2026-09-15 17:03:11 +02:00
parent 289ba7104e
commit 7e58f5fbae
9 changed files with 132 additions and 188 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
libraries/libmesosphere/source/svc/kern_svc_process.cpp
View File

@@ -86,6 +86,40 @@ namespace ams::kern::svc {
R_RETURN(KProcess::GetProcessList(out_num_processes, out_process_ids, max_out_count));
}
constexpr size_t GetProcessSlotT0Sz(ams::svc::CreateProcessFlag flags) {
if ((flags & ams::svc::CreateProcessFlag_AddressSpaceMask) == ams::svc::CreateProcessFlag_AddressSpace64Bit64KPage) {
return (64 - 42);
} else {
return (64 - 39);
}
}
KProcess *CreateProcessForAddressSpace(ams::svc::CreateProcessFlag flags) {
/* Find a process slab slot whose root page table is meant for the requested address space. */
const size_t desired_t0sz = GetProcessSlotT0Sz(flags);
KProcess *process = nullptr;
KProcess *rejected[init::SlabCountKProcess];
size_t num_rejected = 0;
while ((process = KProcess::Create()) != nullptr) {
/* Stop once we find a slot whose T0SZ matches. */
if ((KProcessPageTable::GetProcessTcrEl1(process->GetSlabIndex()) & 0x3F) == desired_t0sz) {
break;
}
/* Otherwise, park the process and try the next slot. */
rejected[num_rejected++] = process;
process = nullptr;
}
/* Release every process we parked while searching. */
for (size_t i = 0; i < num_rejected; ++i) {
rejected[i]->Close();
}
return process;
}
Result CreateProcess(ams::svc::Handle *out, const ams::svc::CreateProcessParameter &params, KUserPointer<const uint32_t *> user_caps, int32_t num_caps) {
/* Validate the capabilities pointer. */
R_UNLESS(num_caps >= 0, svc::ResultInvalidPointer());
@@ -219,8 +253,8 @@ namespace ams::kern::svc {
/* Get the current handle table. */
auto &handle_table = GetCurrentProcess().GetHandleTable();
/* Create the new process. */
KProcess *process = KProcess::Create();
/* Create the new process, ensuring its page table slot matches the requested address space. */
KProcess *process = CreateProcessForAddressSpace(static_cast<ams::svc::CreateProcessFlag>(params.flags));
R_UNLESS(process != nullptr, svc::ResultOutOfResource());
/* Ensure that the only reference to the process is in the handle table when we're done. */