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

["wenyi,xie" <xiewenyi2@huawei.com>]

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