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svc: Implement svcSetResourceLimitLimitValue()

The opposite of the getter functions, this function sets the limit value
for a particular ResourceLimit resource category, with the restriction
that the  new limit value must be equal to or greater than the current
resource value. If this is violated, then ERR_INVALID_STATE is returned.

e.g.

Assume:

current[Events] = 10;
limit[Events] = 20;

a call to this service function lowering the limit value to 10 would be
fine, however, attempting to lower it to 9 in this case would cause an
invalid state error.
This commit is contained in:
Lioncash 2018-11-26 19:51:09 -05:00
parent eb5596044d
commit 5905162e36

View file

@ -1424,6 +1424,41 @@ static ResultCode GetResourceLimitCurrentValue(u64* out_value, Handle resource_l
return RESULT_SUCCESS;
}
static ResultCode SetResourceLimitLimitValue(Handle resource_limit, u32 resource_type, u64 value) {
LOG_DEBUG(Kernel_SVC, "called. Handle={:08X}, Resource type={}, Value={}", resource_limit,
resource_type, value);
const auto type = static_cast<ResourceType>(resource_type);
if (!IsValidResourceType(type)) {
LOG_ERROR(Kernel_SVC, "Invalid resource limit type: '{}'", resource_type);
return ERR_INVALID_ENUM_VALUE;
}
auto& kernel = Core::System::GetInstance().Kernel();
auto* const current_process = kernel.CurrentProcess();
ASSERT(current_process != nullptr);
auto resource_limit_object =
current_process->GetHandleTable().Get<ResourceLimit>(resource_limit);
if (!resource_limit_object) {
LOG_ERROR(Kernel_SVC, "Handle to non-existent resource limit instance used. Handle={:08X}",
resource_limit);
return ERR_INVALID_HANDLE;
}
const auto set_result = resource_limit_object->SetLimitValue(type, static_cast<s64>(value));
if (set_result.IsError()) {
LOG_ERROR(
Kernel_SVC,
"Attempted to lower resource limit ({}) for category '{}' below its current value ({})",
resource_limit_object->GetMaxResourceValue(type), resource_type,
resource_limit_object->GetCurrentResourceValue(type));
return set_result;
}
return RESULT_SUCCESS;
}
namespace {
struct FunctionDef {
using Func = void();
@ -1561,7 +1596,7 @@ static const FunctionDef SVC_Table[] = {
{0x7B, nullptr, "TerminateProcess"},
{0x7C, SvcWrap<GetProcessInfo>, "GetProcessInfo"},
{0x7D, SvcWrap<CreateResourceLimit>, "CreateResourceLimit"},
{0x7E, nullptr, "SetResourceLimitLimitValue"},
{0x7E, SvcWrap<SetResourceLimitLimitValue>, "SetResourceLimitLimitValue"},
{0x7F, nullptr, "CallSecureMonitor"},
};