mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
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539 lines
16 KiB
C
539 lines
16 KiB
C
/** @file
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This library provides helper functions to prevent integer overflow during
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type conversion, addition, subtraction, and multiplication.
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Copyright (c) 2017, Microsoft Corporation
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All rights reserved.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h>
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#include <Library/SafeIntLib.h>
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#include <Library/BaseLib.h>
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/**
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INT32 -> UINTN conversion
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Converts the value specified by Operand to a value specified by Result type
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and stores the converted value into the caller allocated output buffer
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specified by Result. The caller must pass in a Result buffer that is at
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least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the conversion results in an overflow or an underflow condition, then
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Result is set to UINTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Operand Operand to be converted to new type
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@param[out] Result Pointer to the result of conversion
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@retval RETURN_SUCCESS Successful conversion
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeInt32ToUintn (
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IN INT32 Operand,
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OUT UINTN *Result
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)
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{
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return SafeInt32ToUint32 (Operand, (UINT32 *)Result);
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}
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/**
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UINT32 -> INTN conversion
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Converts the value specified by Operand to a value specified by Result type
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and stores the converted value into the caller allocated output buffer
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specified by Result. The caller must pass in a Result buffer that is at
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least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the conversion results in an overflow or an underflow condition, then
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Result is set to INTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Operand Operand to be converted to new type
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@param[out] Result Pointer to the result of conversion
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@retval RETURN_SUCCESS Successful conversion
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeUint32ToIntn (
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IN UINT32 Operand,
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OUT INTN *Result
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)
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{
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return SafeUint32ToInt32 (Operand, (INT32 *)Result);
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}
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/**
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INTN -> INT32 conversion
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Converts the value specified by Operand to a value specified by Result type
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and stores the converted value into the caller allocated output buffer
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specified by Result. The caller must pass in a Result buffer that is at
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least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the conversion results in an overflow or an underflow condition, then
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Result is set to INT32_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Operand Operand to be converted to new type
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@param[out] Result Pointer to the result of conversion
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@retval RETURN_SUCCESS Successful conversion
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeIntnToInt32 (
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IN INTN Operand,
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OUT INT32 *Result
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)
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{
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if (Result == NULL) {
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return RETURN_INVALID_PARAMETER;
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}
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*Result = (INT32)Operand;
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return RETURN_SUCCESS;
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}
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/**
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INTN -> UINT32 conversion
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Converts the value specified by Operand to a value specified by Result type
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and stores the converted value into the caller allocated output buffer
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specified by Result. The caller must pass in a Result buffer that is at
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least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the conversion results in an overflow or an underflow condition, then
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Result is set to UINT32_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Operand Operand to be converted to new type
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@param[out] Result Pointer to the result of conversion
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@retval RETURN_SUCCESS Successful conversion
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeIntnToUint32 (
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IN INTN Operand,
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OUT UINT32 *Result
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)
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{
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RETURN_STATUS Status;
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if (Result == NULL) {
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return RETURN_INVALID_PARAMETER;
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}
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if (Operand >= 0) {
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*Result = (UINT32)Operand;
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Status = RETURN_SUCCESS;
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} else {
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*Result = UINT32_ERROR;
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Status = RETURN_BUFFER_TOO_SMALL;
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}
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return Status;
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}
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/**
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UINTN -> UINT32 conversion
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Converts the value specified by Operand to a value specified by Result type
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and stores the converted value into the caller allocated output buffer
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specified by Result. The caller must pass in a Result buffer that is at
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least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the conversion results in an overflow or an underflow condition, then
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Result is set to UINT32_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Operand Operand to be converted to new type
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@param[out] Result Pointer to the result of conversion
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@retval RETURN_SUCCESS Successful conversion
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeUintnToUint32 (
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IN UINTN Operand,
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OUT UINT32 *Result
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)
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{
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if (Result == NULL) {
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return RETURN_INVALID_PARAMETER;
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}
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*Result = (UINT32)Operand;
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return RETURN_SUCCESS;
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}
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/**
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UINTN -> INT64 conversion
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Converts the value specified by Operand to a value specified by Result type
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and stores the converted value into the caller allocated output buffer
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specified by Result. The caller must pass in a Result buffer that is at
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least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the conversion results in an overflow or an underflow condition, then
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Result is set to INT64_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Operand Operand to be converted to new type
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@param[out] Result Pointer to the result of conversion
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@retval RETURN_SUCCESS Successful conversion
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeUintnToInt64 (
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IN UINTN Operand,
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OUT INT64 *Result
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)
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{
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if (Result == NULL) {
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return RETURN_INVALID_PARAMETER;
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}
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*Result = (INT64)Operand;
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return RETURN_SUCCESS;
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}
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/**
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INT64 -> INTN conversion
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Converts the value specified by Operand to a value specified by Result type
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and stores the converted value into the caller allocated output buffer
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specified by Result. The caller must pass in a Result buffer that is at
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least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the conversion results in an overflow or an underflow condition, then
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Result is set to INTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Operand Operand to be converted to new type
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@param[out] Result Pointer to the result of conversion
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@retval RETURN_SUCCESS Successful conversion
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeInt64ToIntn (
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IN INT64 Operand,
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OUT INTN *Result
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)
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{
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return SafeInt64ToInt32 (Operand, (INT32 *)Result);
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}
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/**
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INT64 -> UINTN conversion
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Converts the value specified by Operand to a value specified by Result type
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and stores the converted value into the caller allocated output buffer
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specified by Result. The caller must pass in a Result buffer that is at
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least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the conversion results in an overflow or an underflow condition, then
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Result is set to UINTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Operand Operand to be converted to new type
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@param[out] Result Pointer to the result of conversion
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@retval RETURN_SUCCESS Successful conversion
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeInt64ToUintn (
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IN INT64 Operand,
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OUT UINTN *Result
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)
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{
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return SafeInt64ToUint32 (Operand, (UINT32 *)Result);
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}
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/**
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UINT64 -> UINTN conversion
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Converts the value specified by Operand to a value specified by Result type
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and stores the converted value into the caller allocated output buffer
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specified by Result. The caller must pass in a Result buffer that is at
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least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the conversion results in an overflow or an underflow condition, then
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Result is set to UINTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Operand Operand to be converted to new type
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@param[out] Result Pointer to the result of conversion
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@retval RETURN_SUCCESS Successful conversion
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeUint64ToUintn (
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IN UINT64 Operand,
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OUT UINTN *Result
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)
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{
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return SafeUint64ToUint32 ((UINT64) Operand, (UINT32 *)Result);
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}
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/**
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UINTN addition
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Performs the requested operation using the input parameters into a value
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specified by Result type and stores the converted value into the caller
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allocated output buffer specified by Result. The caller must pass in a
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Result buffer that is at least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the requested operation results in an overflow or an underflow condition,
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then Result is set to UINTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Augend A number to which addend will be added
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@param[in] Addend A number to be added to another
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@param[out] Result Pointer to the result of addition
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@retval RETURN_SUCCESS Successful addition
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeUintnAdd (
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IN UINTN Augend,
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IN UINTN Addend,
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OUT UINTN *Result
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)
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{
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RETURN_STATUS Status;
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if (Result == NULL) {
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return RETURN_INVALID_PARAMETER;
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}
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if ((Augend + Addend) >= Augend) {
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*Result = (Augend + Addend);
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Status = RETURN_SUCCESS;
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} else {
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*Result = UINTN_ERROR;
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Status = RETURN_BUFFER_TOO_SMALL;
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}
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return Status;
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}
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/**
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UINTN subtraction
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Performs the requested operation using the input parameters into a value
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specified by Result type and stores the converted value into the caller
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allocated output buffer specified by Result. The caller must pass in a
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Result buffer that is at least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the requested operation results in an overflow or an underflow condition,
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then Result is set to UINTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Minuend A number from which another is to be subtracted.
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@param[in] Subtrahend A number to be subtracted from another
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@param[out] Result Pointer to the result of subtraction
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@retval RETURN_SUCCESS Successful subtraction
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@retval RETURN_BUFFER_TOO_SMALL Underflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeUintnSub (
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IN UINTN Minuend,
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IN UINTN Subtrahend,
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OUT UINTN *Result
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)
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{
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RETURN_STATUS Status;
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if (Result == NULL) {
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return RETURN_INVALID_PARAMETER;
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}
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if (Minuend >= Subtrahend) {
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*Result = (Minuend - Subtrahend);
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Status = RETURN_SUCCESS;
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} else {
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*Result = UINTN_ERROR;
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Status = RETURN_BUFFER_TOO_SMALL;
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}
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return Status;
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}
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/**
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UINTN multiplication
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Performs the requested operation using the input parameters into a value
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specified by Result type and stores the converted value into the caller
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allocated output buffer specified by Result. The caller must pass in a
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Result buffer that is at least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the requested operation results in an overflow or an underflow condition,
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then Result is set to UINTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Multiplicand A number that is to be multiplied by another
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@param[in] Multiplier A number by which the multiplicand is to be multiplied
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@param[out] Result Pointer to the result of multiplication
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@retval RETURN_SUCCESS Successful multiplication
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeUintnMult (
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IN UINTN Multiplicand,
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IN UINTN Multiplier,
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OUT UINTN *Result
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)
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{
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UINT64 IntermediateResult;
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IntermediateResult = ((UINT64) Multiplicand) *((UINT64) Multiplier);
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return SafeUint64ToUintn (IntermediateResult, Result);
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}
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/**
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INTN Addition
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Performs the requested operation using the input parameters into a value
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specified by Result type and stores the converted value into the caller
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allocated output buffer specified by Result. The caller must pass in a
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Result buffer that is at least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the requested operation results in an overflow or an underflow condition,
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then Result is set to INTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Augend A number to which addend will be added
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@param[in] Addend A number to be added to another
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@param[out] Result Pointer to the result of addition
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@retval RETURN_SUCCESS Successful addition
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeIntnAdd (
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IN INTN Augend,
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IN INTN Addend,
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OUT INTN *Result
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)
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{
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return SafeInt64ToIntn (((INT64)Augend) + ((INT64)Addend), Result);
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}
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/**
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INTN Subtraction
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Performs the requested operation using the input parameters into a value
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specified by Result type and stores the converted value into the caller
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allocated output buffer specified by Result. The caller must pass in a
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Result buffer that is at least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the requested operation results in an overflow or an underflow condition,
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then Result is set to INTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Minuend A number from which another is to be subtracted.
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@param[in] Subtrahend A number to be subtracted from another
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@param[out] Result Pointer to the result of subtraction
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@retval RETURN_SUCCESS Successful subtraction
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@retval RETURN_BUFFER_TOO_SMALL Underflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeIntnSub (
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IN INTN Minuend,
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IN INTN Subtrahend,
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OUT INTN *Result
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)
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{
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return SafeInt64ToIntn (((INT64)Minuend) - ((INT64)Subtrahend), Result);
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}
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/**
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INTN multiplication
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Performs the requested operation using the input parameters into a value
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specified by Result type and stores the converted value into the caller
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allocated output buffer specified by Result. The caller must pass in a
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Result buffer that is at least as large as the Result type.
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If Result is NULL, RETURN_INVALID_PARAMETER is returned.
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If the requested operation results in an overflow or an underflow condition,
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then Result is set to INTN_ERROR and RETURN_BUFFER_TOO_SMALL is returned.
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@param[in] Multiplicand A number that is to be multiplied by another
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@param[in] Multiplier A number by which the multiplicand is to be multiplied
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@param[out] Result Pointer to the result of multiplication
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@retval RETURN_SUCCESS Successful multiplication
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@retval RETURN_BUFFER_TOO_SMALL Overflow
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@retval RETURN_INVALID_PARAMETER Result is NULL
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**/
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RETURN_STATUS
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EFIAPI
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SafeIntnMult (
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IN INTN Multiplicand,
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IN INTN Multiplier,
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OUT INTN *Result
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)
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{
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return SafeInt64ToIntn (MultS64x64 (Multiplicand, Multiplier), Result);
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}
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