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kern: implement KUserPointer (and test with QueryMemory) in advance of svc dev

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This commit is contained in:
Michael Scire 2020-02-20 09:05:01 -08:00
parent 9f9593e05f
commit efae01c165
17 changed files with 460 additions and 72 deletions
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183
libraries/libmesosphere/include/mesosphere/svc/kern_svc_k_user_pointer.hpp
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@ -16,18 +16,187 @@
#pragma once
#include <vapours.hpp>
#include <mesosphere/svc/kern_svc_results.hpp>
#include <mesosphere/kern_select_userspace_memory_access.hpp>
namespace ams::kern::svc {
/* TODO: Actually implement this type. */
template<typename T>
struct KUserPointer : impl::KUserPointerTag {
namespace impl {
/* TODO: C++20
template<typename T>
concept Pointer = std::is_pointer<T>::value;
template<typename T>
concept NonConstPointer = Pointer<T> && !std::is_const<typename std::remove_pointer<T>::type>::value;
template<typename T>
concept ConstPointer = Pointer<T> && std::is_const<typename std::remove_pointer<T>::type>::value;
template<typename T, size_t N>
concept AlignedNPointer = Pointer<T> && alignof(typename std::remove_pointer<T>::type) >= N && util::IsAligned(sizeof(typename std::remove_pointer<T>::type), N);
template<typename T>
concept Aligned8Pointer = AlignedNPointer<T, sizeof(u8)>;
template<typename T>
concept Aligned16Pointer = AlignedNPointer<T, sizeof(u16)> && Aligned8<T>;
template<typename T>
concept Aligned32Pointer = AlignedNPointer<T, sizeof(u32)> && Aligned16<T>;
template<typename T>
concept Aligned64Pointer = AlignedNPointer<T, sizeof(u64)> && Aligned32<T>;
*/
template<typename T>
constexpr inline bool IsPointer = std::is_pointer<T>::value;
template<typename T>
constexpr inline bool IsConstPointer = IsPointer<T> && std::is_const<typename std::remove_pointer<T>::type>::value;
template<typename T>
constexpr inline bool IsNonConstPointer = IsPointer<T> && !std::is_const<typename std::remove_pointer<T>::type>::value;
template<typename T, size_t N>
constexpr inline bool IsAlignedNPointer = IsPointer<T> && alignof(typename std::remove_pointer<T>::type) >= N && util::IsAligned(sizeof(typename std::remove_pointer<T>::type), N);
template<typename _T, typename = void> /* requires Aligned8Pointer<_T> */
class KUserPointerImplTraits {
static_assert(IsAlignedNPointer<_T, sizeof(u8)>);
public:
using T = typename std::remove_const<typename std::remove_pointer<_T>::type>::type;
public:
static Result CopyFromUserspace(void *dst, const void *src, size_t size) {
R_UNLESS(UserspaceAccess::CopyMemoryFromUser(dst, src, size), svc::ResultInvalidPointer());
return ResultSuccess();
}
static Result CopyToUserspace(void *dst, const void *src, size_t size) {
R_UNLESS(UserspaceAccess::CopyMemoryToUser(dst, src, size), svc::ResultInvalidPointer());
return ResultSuccess();
}
};
template<typename _T> /* requires Aligned32Pointer<_T> */
class KUserPointerImplTraits<_T, typename std::enable_if<IsAlignedNPointer<_T, sizeof(u32)> && !IsAlignedNPointer<_T, sizeof(u64)>>::type> {
static_assert(IsAlignedNPointer<_T, sizeof(u32)>);
public:
using T = typename std::remove_const<typename std::remove_pointer<_T>::type>::type;
public:
static Result CopyFromUserspace(void *dst, const void *src, size_t size) {
R_UNLESS(UserspaceAccess::CopyMemoryFromUserAligned32Bit(dst, src, size), svc::ResultInvalidPointer());
return ResultSuccess();
}
static Result CopyToUserspace(void *dst, const void *src, size_t size) {
R_UNLESS(UserspaceAccess::CopyMemoryToUserAligned32Bit(dst, src, size), svc::ResultInvalidPointer());
return ResultSuccess();
}
};
template<typename _T> /* requires Aligned64Pointer<_T> */
class KUserPointerImplTraits<_T, typename std::enable_if<IsAlignedNPointer<_T, sizeof(u64)>>::type> {
static_assert(IsAlignedNPointer<_T, sizeof(u64)>);
public:
using T = typename std::remove_const<typename std::remove_pointer<_T>::type>::type;
public:
static Result CopyFromUserspace(void *dst, const void *src, size_t size) {
R_UNLESS(UserspaceAccess::CopyMemoryFromUserAligned64Bit(dst, src, size), svc::ResultInvalidPointer());
return ResultSuccess();
}
static Result CopyToUserspace(void *dst, const void *src, size_t size) {
R_UNLESS(UserspaceAccess::CopyMemoryToUserAligned64Bit(dst, src, size), svc::ResultInvalidPointer());
return ResultSuccess();
}
};
template<typename _T> /* requires Aligned8Pointer<_T> */
class KUserPointerImpl : impl::KUserPointerTag {
private:
using Traits = KUserPointerImplTraits<_T>;
protected:
using T = typename std::remove_const<typename std::remove_pointer<_T>::type>::type;
private:
_T *ptr;
private:
Result CopyToImpl(void *p, size_t size) const {
return Traits::CopyFromUserspace(p, this->ptr, size);
}
Result CopyFromImpl(const void *p, size_t size) const {
return Traits::CopyToUserspace(this->ptr, p, size);
}
protected:
Result CopyTo(T *p) const { return this->CopyToImpl(p, sizeof(*p)); }
Result CopyFrom(const T *p) const { return this->CopyFromImpl(p, sizeof(*p)); }
Result CopyArrayElementTo(T *p, size_t index) const { return Traits::CopyFromUserspace(p, this->ptr + index, sizeof(*p)); }
Result CopyArrayElementFrom(const T *p, size_t index) const { return Traits::CopyToUserspace(this->ptr + index, p, sizeof(*p)); }
Result CopyArrayTo(T *arr, size_t count) const { return this->CopyToImpl(arr, sizeof(*arr) * count); }
Result CopyArrayFrom(const T *arr, size_t count) const { return this->CopyFromImpl(arr, sizeof(*arr) * count); }
constexpr bool IsNull() const { return this->ptr == nullptr; }
};
template<>
class KUserPointerImpl<const char *> : impl::KUserPointerTag {
private:
using Traits = KUserPointerImplTraits<const char *>;
protected:
using T = char;
private:
const char *ptr;
protected:
Result CopyStringTo(char *dst, size_t size) const {
static_assert(sizeof(char) == 1);
R_UNLESS(UserspaceAccess::CopyStringFromUser(dst, this->ptr, size) > 0, svc::ResultInvalidPointer());
return ResultSuccess();
}
Result CopyArrayElementTo(char *dst, size_t index) const {
return Traits::CopyFromUserspace(dst, this->ptr + index, sizeof(*dst));
}
constexpr bool IsNull() const { return this->ptr == nullptr; }
};
}
template<typename T, typename = void>
class KUserPointer;
template<typename T> /* requires impl::ConstPointer<T> */
struct KUserPointer<T, typename std::enable_if<impl::IsConstPointer<T>>::type> : public impl::KUserPointerImpl<T> {
public:
static_assert(std::is_pointer<T>::value);
static constexpr bool IsInput = std::is_const<typename std::remove_pointer<T>::type>::value;
private:
T pointer;
static constexpr bool IsInput = true;
public:
using impl::KUserPointerImpl<T>::CopyTo;
using impl::KUserPointerImpl<T>::CopyArrayElementTo;
using impl::KUserPointerImpl<T>::CopyArrayTo;
using impl::KUserPointerImpl<T>::IsNull;
};
template<typename T> /* requires impl::NonConstPointer<T> */
struct KUserPointer<T, typename std::enable_if<impl::IsNonConstPointer<T>>::type> : public impl::KUserPointerImpl<T> {
public:
static constexpr bool IsInput = false;
public:
using impl::KUserPointerImpl<T>::CopyFrom;
using impl::KUserPointerImpl<T>::CopyArrayElementFrom;
using impl::KUserPointerImpl<T>::CopyArrayFrom;
using impl::KUserPointerImpl<T>::IsNull;
};
template<>
struct KUserPointer<const char *> : public impl::KUserPointerImpl<const char *> {
public:
static constexpr bool IsInput = true;
public:
using impl::KUserPointerImpl<const char *>::CopyStringTo;
using impl::KUserPointerImpl<const char *>::CopyArrayElementTo;
using impl::KUserPointerImpl<const char *>::IsNull;
};
}