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Process: check source/target overlap for Map/Unmap

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This commit is contained in:
Weiyi Wang 2018-11-11 12:38:52 -05:00
parent 3db8915356
commit 29ade3e610
1 changed files with 25 additions and 13 deletions
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26
src/core/hle/kernel/process.cpp
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@ -321,16 +321,22 @@ ResultCode Process::Map(VAddr target, VAddr source, u32 size, VMAPermission perm
return ERR_INVALID_ADDRESS_STATE;
}
if (source == target) {
// Check range overlapping
if (source - target < size || target - source < size) {
if (privileged) {
// privileged Map allows identical source and target address, which simply changes the
// state and the permission of the memory
if (source == target) {
// privileged Map allows identical source and target address, which simply changes
// the state and the permission of the memory
return vm_manager.ChangeMemoryState(source, size, MemoryState::Private,
VMAPermission::ReadWrite, MemoryState::AliasCode,
perms);
VMAPermission::ReadWrite,
MemoryState::AliasCode, perms);
} else {
return ERR_INVALID_ADDRESS;
}
} else {
return ERR_INVALID_ADDRESS_STATE;
}
}
MemoryState source_state = privileged ? MemoryState::Locked : MemoryState::Aliased;
MemoryState target_state = privileged ? MemoryState::AliasCode : MemoryState::Alias;
@ -367,15 +373,21 @@ ResultCode Process::Unmap(VAddr target, VAddr source, u32 size, VMAPermission pe
// TODO(wwylele): check that the source and the target are actually a pair created by Map
// Should return error 0xD8E007F5 in this case
if (source == target) {
if (source - target < size || target - source < size) {
if (privileged) {
if (source == target) {
// privileged Unmap allows identical source and target address, which simply changes
// the state and the permission of the memory
return vm_manager.ChangeMemoryState(source, size, MemoryState::AliasCode,
VMAPermission::None, MemoryState::Private, perms);
VMAPermission::None, MemoryState::Private,
perms);
} else {
return ERR_INVALID_ADDRESS;
}
} else {
return ERR_INVALID_ADDRESS_STATE;
}
}
MemoryState source_state = privileged ? MemoryState::Locked : MemoryState::Aliased;