Re: [PATCH EDK2 v2 1/1] CryptoPkg/BaseCryptLib:time overflow

["Yao, Jiewen" <jiewen.yao@intel.com>]

Merged https://github.com/tianocore/edk2/pull/3710

> -----Original Message-----
> From: Wenyi Xie <xiewenyi2@huawei.com>
> Sent: Friday, December 2, 2022 1:52 PM
> To: devel@edk2.groups.io; Yao, Jiewen <jiewen.yao@intel.com>; Wang, Jian
> J <jian.j.wang@intel.com>; Lu, Xiaoyu1 <xiaoyu1.lu@intel.com>; Jiang,
> Guomin <guomin.jiang@intel.com>
> Cc: songdongkuang@huawei.com; xiewenyi2@huawei.com;
> yizihong@huawei.com
> Subject: [PATCH EDK2 v2 1/1] CryptoPkg/BaseCryptLib:time overflow
> 
> From: Zihong Yi <yizihong@huawei.com>
> 
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4167
> 
> In CrtLibSupport.h, time_t is defined as INT32, and its maximum value
> is 2147483647. That is, the corresponding maximum timestamp is
> 2038-01-19 11:14:07. Therefore, overflow occurs when the test time
> exceeds 2038-01-19 11:14:07. So change the type of time_t to INT64 and
> also change the type of variables in function gmtime which calculated
> with time_t.
> 
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Cc: Jian J Wang <jian.j.wang@intel.com>
> Cc: Xiaoyu Lu <xiaoyu1.lu@intel.com>
> Cc: Guomin Jiang <guomin.jiang@intel.com>
> Signed-off-by: Zihong Yi <yizihong@huawei.com>
> ---
>  CryptoPkg/Library/Include/CrtLibSupport.h             |  2 +-
>  CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c | 51
> ++++++++++++++------
>  2 files changed, 38 insertions(+), 15 deletions(-)
> 
> diff --git a/CryptoPkg/Library/Include/CrtLibSupport.h
> b/CryptoPkg/Library/Include/CrtLibSupport.h
> index 5072c343da57..94b0e6b6014f 100644
> --- a/CryptoPkg/Library/Include/CrtLibSupport.h
> +++ b/CryptoPkg/Library/Include/CrtLibSupport.h
> @@ -109,7 +109,7 @@ typedef UINTN   off_t;
>  typedef UINTN   u_int;
>  typedef INTN    ptrdiff_t;
>  typedef INTN    ssize_t;
> -typedef INT32   time_t;
> +typedef INT64   time_t;
>  typedef UINT8   __uint8_t;
>  typedef UINT8   sa_family_t;
>  typedef UINT8   u_char;
> diff --git a/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c
> b/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c
> index bf8a5325817f..2dfc6fe6c593 100644
> --- a/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c
> +++ b/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c
> @@ -15,7 +15,6 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
>  // -- Time Management Routines --
>  //
> 
> -#define IsLeap(y)  (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
>  #define SECSPERMIN   (60)
>  #define SECSPERHOUR  (60 * 60)
>  #define SECSPERDAY   (24 * SECSPERHOUR)
> @@ -60,6 +59,26 @@ UINTN  CumulativeDays[2][14] = {
>    }
>  };
> 
> +/* Check the year is leap or not. */
> +// BOOLEAN IsLeap(
> +//  INTN timer
> +//  )
> +BOOLEAN
> +IsLeap (
> +  time_t  timer
> +  )
> +{
> +  INT64  Remainder1;
> +  INT64  Remainder2;
> +  INT64  Remainder3;
> +
> +  DivS64x64Remainder (timer, 4, &Remainder1);
> +  DivS64x64Remainder (timer, 100, &Remainder2);
> +  DivS64x64Remainder (timer, 400, &Remainder3);
> +
> +  return (Remainder1 == 0 && (Remainder2 != 0 || Remainder3 == 0));
> +}
> +
>  /* Get the system time as seconds elapsed since midnight, January 1, 1970.
> */
>  // INTN time(
>  //  INTN *timer
> @@ -117,12 +136,13 @@ gmtime (
>    )
>  {
>    struct tm  *GmTime;
> -  UINT16     DayNo;
> -  UINT32     DayRemainder;
> +  UINT64     DayNo;
> +  UINT64     DayRemainder;
>    time_t     Year;
>    time_t     YearNo;
> -  UINT16     TotalDays;
> -  UINT16     MonthNo;
> +  UINT32     TotalDays;
> +  UINT32     MonthNo;
> +  INT64      Remainder;
> 
>    if (timer == NULL) {
>      return NULL;
> @@ -135,18 +155,21 @@ gmtime (
> 
>    ZeroMem ((VOID *)GmTime, (UINTN)sizeof (struct tm));
> 
> -  DayNo        = (UINT16)(*timer / SECSPERDAY);
> -  DayRemainder = (UINT32)(*timer % SECSPERDAY);
> +  DayNo        = (UINT64)DivS64x64Remainder (*timer, SECSPERDAY,
> &Remainder);
> +  DayRemainder = (UINT64)Remainder;
> 
> -  GmTime->tm_sec  = (int)(DayRemainder % SECSPERMIN);
> -  GmTime->tm_min  = (int)((DayRemainder % SECSPERHOUR) /
> SECSPERMIN);
> -  GmTime->tm_hour = (int)(DayRemainder / SECSPERHOUR);
> -  GmTime->tm_wday = (int)((DayNo + 4) % 7);
> +  DivS64x64Remainder (DayRemainder, SECSPERMIN, &Remainder);
> +  GmTime->tm_sec = (int)Remainder;
> +  DivS64x64Remainder (DayRemainder, SECSPERHOUR, &Remainder);
> +  GmTime->tm_min  = (int)DivS64x64Remainder (Remainder, SECSPERMIN,
> NULL);
> +  GmTime->tm_hour = (int)DivS64x64Remainder (DayRemainder,
> SECSPERHOUR, NULL);
> +  DivS64x64Remainder ((DayNo + 4), 7, &Remainder);
> +  GmTime->tm_wday = (int)Remainder;
> 
>    for (Year = 1970, YearNo = 0; DayNo > 0; Year++) {
> -    TotalDays = (UINT16)(IsLeap (Year) ? 366 : 365);
> +    TotalDays = (UINT32)(IsLeap (Year) ? 366 : 365);
>      if (DayNo >= TotalDays) {
> -      DayNo = (UINT16)(DayNo - TotalDays);
> +      DayNo = (UINT64)(DayNo - TotalDays);
>        YearNo++;
>      } else {
>        break;
> @@ -158,7 +181,7 @@ gmtime (
> 
>    for (MonthNo = 12; MonthNo > 1; MonthNo--) {
>      if (DayNo >= CumulativeDays[IsLeap (Year)][MonthNo]) {
> -      DayNo = (UINT16)(DayNo - (UINT16)(CumulativeDays[IsLeap
> (Year)][MonthNo]));
> +      DayNo = (UINT64)(DayNo - (UINT32)(CumulativeDays[IsLeap
> (Year)][MonthNo]));
>        break;
>      }
>    }
> --
> 2.20.1.windows.1