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memory: preserve live POSIX mappings during partial unmap

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Co-authored-by: Ali Almohaya <AliAlmohaya@gmail.com>
This commit is contained in:
nmzik
2026-09-13 10:33:46 +04:00
parent 87971a28f5
commit b2fdad9e47
2 changed files with 64 additions and 28 deletions
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tests/VirtualMemoryAllocationTests.cpp
+45
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@@ -20,6 +20,11 @@
#include <string>
#include <vector>
#if defined(__linux__)
#include <sys/uio.h>
#include <unistd.h>
#endif
#if KYTY_PLATFORM == KYTY_PLATFORM_WINDOWS
#ifndef NOMINMAX
#define NOMINMAX
@@ -1163,6 +1168,43 @@ void TestDirectPartialProtectUnmapPreservesNeighbors() {
std::printf("[host] %-48s ok\n", test);
}
#if defined(__linux__)
void TestPartialUnmapPreservesHostPermissions() {
const char* test = "PartialUnmapPreservesHostPermissions";
const auto base = MapNamedFlexible(test, SceKernelPageSize * 3, SceKernelProtCpuRw,
"unmap_host_permissions");
using Common::VirtualMemory::Mode;
Check(test, Libs::LibKernel::Memory::ProtectGuestHostMemory(base, SceKernelPageSize, Mode::Read),
"could not protect the left survivor from writes");
Check(test,
Libs::LibKernel::Memory::ProtectGuestHostMemory(base + SceKernelPageSize * 2,
SceKernelPageSize, Mode::NoAccess),
"could not protect the right survivor from reads");
CheckOk(test,
Libs::LibKernel::Memory::KernelMunmap(base + SceKernelPageSize, SceKernelPageSize),
"KernelMunmap(middle)");
// Probe actual host access without taking a signal or changing the page protections.
uint64_t value = 0;
iovec local {&value, sizeof(value)};
iovec left {reinterpret_cast<void*>(base), sizeof(value)};
iovec right {reinterpret_cast<void*>(base + SceKernelPageSize * 2), sizeof(value)};
Check(test, process_vm_readv(getpid(), &local, 1, &left, 1, 0) == sizeof(value),
"partial unmap removed read access to the left survivor");
Check(test, process_vm_writev(getpid(), &local, 1, &left, 1, 0) == -1,
"partial unmap removed the left survivor's write protection");
Check(test, process_vm_readv(getpid(), &local, 1, &right, 1, 0) == -1,
"partial unmap removed the right survivor's read protection");
CheckOk(test, Libs::LibKernel::Memory::KernelMunmap(base, SceKernelPageSize),
"KernelMunmap(left cleanup)");
CheckOk(test,
Libs::LibKernel::Memory::KernelMunmap(base + SceKernelPageSize * 2, SceKernelPageSize),
"KernelMunmap(right cleanup)");
std::printf("[host] %-48s ok\n", test);
}
#endif
void TestDirectMapValidationBeforeOwnerMutation() {
const char* test = "DirectMapValidationBeforeOwnerMutation";
int64_t invalid = -1;
@@ -2529,6 +2571,9 @@ int main(int argc, char** argv) {
RunTest(TestMunmapAcrossAdjacentFlexibleMappings);
RunTest(TestDirectMapQueryOffsetAndPartialMunmap);
RunTest(TestDirectPartialProtectUnmapPreservesNeighbors);
#if defined(__linux__)
RunTest(TestPartialUnmapPreservesHostPermissions);
#endif
RunTest(TestDirectMapValidationBeforeOwnerMutation);
RunTest(TestDirectReleaseRollbackRestoresOwnerMapping);
RunTest(TestDirectReleaseContracts);