From: qwang12 <qwang12@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Mon, 12 Mar 2007 09:48:53 +0000 (+0000)
Subject: Add a lock to protect the critical region in Service APIs for gEfiBlockIoProtocolGuid... 
X-Git-Tag: edk2-stable201903~23437
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=ac10bddd8ecdb4a4505271aca05c8b991f99282f

Add a lock to protect the critical region in Service APIs for gEfiBlockIoProtocolGuid and gEfiSimpleFileSystemProtocolGuid Protocol to prevent re-entrance of the same API from from different TPL level. In UEFI 2.1 spec, it is state that the service API for this Protocol is callable at EFI_TPL_CALLBACK level.


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2449 6f19259b-4bc3-4df7-8a09-765794883524
---

diff --git a/EdkUnixPkg/Dxe/UnixThunk/Bus/BlockIo/UnixBlockIo.c b/EdkUnixPkg/Dxe/UnixThunk/Bus/BlockIo/UnixBlockIo.c
index 1425531cf8..ffdf6cf89b 100644
--- a/EdkUnixPkg/Dxe/UnixThunk/Bus/BlockIo/UnixBlockIo.c
+++ b/EdkUnixPkg/Dxe/UnixThunk/Bus/BlockIo/UnixBlockIo.c
@@ -1,6 +1,6 @@
 /*++
 
-Copyright (c) 2004 - 2005, Intel Corporation                                                         
+Copyright (c) 2004 - 2007, Intel Corporation                                                         
 All rights reserved. This program and the accompanying materials                          
 are licensed and made available under the terms and conditions of the BSD License         
 which accompanies this distribution.  The full text of the license may be found at        
@@ -1064,25 +1064,32 @@ UnixBlockIoReadBlocks (
   UNIX_BLOCK_IO_PRIVATE *Private;
   ssize_t                 len;
   EFI_STATUS              Status;
+  EFI_TPL                 OldTpl;
+
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
 
   Private = UNIX_BLOCK_IO_PRIVATE_DATA_FROM_THIS (This);
 
   Status  = UnixBlockIoReadWriteCommon (Private, MediaId, Lba, BufferSize, Buffer, "UnixReadBlocks");
   if (EFI_ERROR (Status)) {
-    return Status;
+    goto Done;
   }
 
   len = Private->UnixThunk->Read (Private->fd, Buffer, BufferSize);
   if (len != BufferSize) {
     DEBUG ((EFI_D_INIT, "ReadBlocks: ReadFile failed.\n"));
-    return UnixBlockIoError (Private);
+    Status = UnixBlockIoError (Private);
+    goto Done;
   }
 
   //
   // If we wrote then media is present.
   //
   This->Media->MediaPresent = TRUE;
-  return EFI_SUCCESS;
+  Status = EFI_SUCCESS;
+
+  gBS->RestoreTPL (OldTpl);
+  return Status;
 }
 
 STATIC
@@ -1123,18 +1130,22 @@ UnixBlockIoWriteBlocks (
   UNIX_BLOCK_IO_PRIVATE *Private;
   ssize_t                 len;
   EFI_STATUS              Status;
+  EFI_TPL                 OldTpl;
+
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
 
   Private = UNIX_BLOCK_IO_PRIVATE_DATA_FROM_THIS (This);
 
   Status  = UnixBlockIoReadWriteCommon (Private, MediaId, Lba, BufferSize, Buffer, "UnixWriteBlocks");
   if (EFI_ERROR (Status)) {
-    return Status;
+    goto Done;
   }
 
   len = Private->UnixThunk->Write (Private->fd, Buffer, BufferSize);
   if (len != BufferSize) {
     DEBUG ((EFI_D_INIT, "ReadBlocks: WriteFile failed.\n"));
-    return UnixBlockIoError (Private);
+    Status = UnixBlockIoError (Private);
+    goto Done;
   }
 
   //
@@ -1142,7 +1153,11 @@ UnixBlockIoWriteBlocks (
   //
   This->Media->MediaPresent = TRUE;
   This->Media->ReadOnly     = FALSE;
-  return EFI_SUCCESS;
+  Status = EFI_SUCCESS;
+
+Done:
+  gBS->RestoreTPL (OldTpl);
+  return Status;
 }
 
 STATIC
@@ -1193,7 +1208,10 @@ UnixBlockIoResetBlock (
 --*/
 {
   UNIX_BLOCK_IO_PRIVATE *Private;
+  EFI_TPL               OldTpl;
 
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  
   Private = UNIX_BLOCK_IO_PRIVATE_DATA_FROM_THIS (This);
 
   if (Private->fd >= 0) {
@@ -1201,6 +1219,8 @@ UnixBlockIoResetBlock (
     Private->fd = -1;
   }
 
+  gBS->RestoreTPL (OldTpl);
+
   return EFI_SUCCESS;
 }
 
diff --git a/EdkUnixPkg/Dxe/UnixThunk/Bus/SimpleFileSystem/UnixSimpleFileSystem.c b/EdkUnixPkg/Dxe/UnixThunk/Bus/SimpleFileSystem/UnixSimpleFileSystem.c
index db272bdc89..51403ebea7 100644
--- a/EdkUnixPkg/Dxe/UnixThunk/Bus/SimpleFileSystem/UnixSimpleFileSystem.c
+++ b/EdkUnixPkg/Dxe/UnixThunk/Bus/SimpleFileSystem/UnixSimpleFileSystem.c
@@ -1,6 +1,6 @@
 /*++
 
-Copyright (c) 2006, Intel Corporation                                                         
+Copyright (c) 2006 - 2007, Intel Corporation                                                         
 All rights reserved. This program and the accompanying materials                          
 are licensed and made available under the terms and conditions of the BSD License         
 which accompanies this distribution.  The full text of the license may be found at        
@@ -632,7 +632,6 @@ Returns:
   CHAR16                            *Src;
   char                              *Dst;
   CHAR8                             *RealFileName;
-  //CHAR16                            *TempFileName;
   char                              *ParseFileName;
   char                              *GuardPointer;
   CHAR8                             TempChar;
@@ -641,6 +640,7 @@ Returns:
   BOOLEAN                           LoopFinish;
   UINTN                             InfoSize;
   EFI_FILE_INFO                     *Info;
+  EFI_TPL                           OldTpl;
 
   TrailingDash = FALSE;
 
@@ -672,9 +672,8 @@ Returns:
     return EFI_INVALID_PARAMETER;
   }
 
-  //
-  //
-  //
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+
   PrivateFile     = UNIX_EFI_FILE_PRIVATE_DATA_FROM_THIS (This);
   PrivateRoot     = UNIX_SIMPLE_FILE_SYSTEM_PRIVATE_DATA_FROM_THIS (PrivateFile->SimpleFileSystem);
   NewPrivateFile  = NULL;
@@ -954,6 +953,8 @@ Done: ;
     *NewHandle = &NewPrivateFile->EfiFile;
   }
 
+  gBS->RestoreTPL (OldTpl);
+
   return Status;
 }
 
@@ -980,6 +981,7 @@ Returns:
 // TODO:    EFI_INVALID_PARAMETER - add return value to function comment
 {
   UNIX_EFI_FILE_PRIVATE *PrivateFile;
+  EFITPL                OldTpl;
 
   if (This == NULL) {
     return EFI_INVALID_PARAMETER;
@@ -987,6 +989,8 @@ Returns:
 
   PrivateFile = UNIX_EFI_FILE_PRIVATE_DATA_FROM_THIS (This);
 
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+
   if (PrivateFile->fd >= 0) {
     PrivateFile->UnixThunk->Close (PrivateFile->fd);
   }
@@ -1002,6 +1006,9 @@ Returns:
   }
 
   gBS->FreePool (PrivateFile);
+
+  gBS->RestoreTPL (OldTpl);
+  
   return EFI_SUCCESS;
 }
 
@@ -1030,12 +1037,15 @@ Returns:
 // TODO:    EFI_INVALID_PARAMETER - add return value to function comment
 {
   EFI_STATUS              Status;
-  UNIX_EFI_FILE_PRIVATE *PrivateFile;
+  UNIX_EFI_FILE_PRIVATE   *PrivateFile;
+  EFI_TPL                 OldTpl;
 
   if (This == NULL) {
     return EFI_INVALID_PARAMETER;
   }
 
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  
   PrivateFile = UNIX_EFI_FILE_PRIVATE_DATA_FROM_THIS (This);
 
   Status      = EFI_WARN_DELETE_FAILURE;
@@ -1250,11 +1260,14 @@ Returns:
   UINTN                   NameSize;
   UINTN                   ResultSize;
   CHAR8                   *FullFileName;
+  EFI_TPL                 OldTpl;
 
   if (This == NULL || BufferSize == NULL || Buffer == NULL) {
     return EFI_INVALID_PARAMETER;
   }
 
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  
   PrivateFile = UNIX_EFI_FILE_PRIVATE_DATA_FROM_THIS (This);
 
   if (!PrivateFile->IsDirectoryPath) {
@@ -1368,7 +1381,9 @@ Returns:
 // TODO:    EFI_INVALID_PARAMETER - add return value to function comment
 {
   UNIX_EFI_FILE_PRIVATE *PrivateFile;
-  UINTN Res;
+  UINTN                 Res;
+  EFI_STATUS            Status;
+  EFI_TPL               OldTpl;
 
   if (This == NULL || BufferSize == NULL || Buffer == NULL) {
     return EFI_INVALID_PARAMETER;
@@ -1388,14 +1403,22 @@ Returns:
     return EFI_ACCESS_DENIED;
   }
 
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  
   Res = PrivateFile->UnixThunk->Write (
 					PrivateFile->fd,
 					Buffer,
 					*BufferSize);
-  if (Res == (UINTN)-1)
-    return EFI_DEVICE_ERROR;
+  if (Res == (UINTN)-1) {
+    Status = EFI_DEVICE_ERROR;
+    goto Done;
+  }
   *BufferSize = Res;
-  return EFI_SUCCESS;
+  Status = EFI_SUCCESS;
+
+Done:
+  gBS->RestoreTPL (OldTpl);
+  return Status;
 
   //
   // bugbug: need to access unix error reporting
@@ -1432,23 +1455,29 @@ Returns:
   EFI_STATUS              Status;
   UNIX_EFI_FILE_PRIVATE *PrivateFile;
   UINT64                  Pos;
+  EFI_TPL                 OldTpl;
 
   if (This == NULL) {
     return EFI_INVALID_PARAMETER;
   }
 
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  
   PrivateFile = UNIX_EFI_FILE_PRIVATE_DATA_FROM_THIS (This);
 
   if (PrivateFile->IsDirectoryPath) {
     if (Position != 0) {
-      return EFI_UNSUPPORTED;
+      Status = EFI_UNSUPPORTED;
+      goto Done;
     }
 
     if (PrivateFile->Dir == NULL) {
-      return EFI_DEVICE_ERROR;
+      Status = EFI_DEVICE_ERROR;
+      goto Done;
     }
     PrivateFile->UnixThunk->RewindDir (PrivateFile->Dir);
-    return EFI_SUCCESS;
+    Status = EFI_SUCCESS;
+    goto Done;
   } else {
     if (Position == (UINT64) -1) {
       Pos = PrivateFile->UnixThunk->Lseek (PrivateFile->fd, 0, SEEK_END);
@@ -1456,9 +1485,11 @@ Returns:
       Pos = PrivateFile->UnixThunk->Lseek (PrivateFile->fd, Position, SEEK_SET);
     }
     Status = (Pos == (UINT64) -1) ? EFI_DEVICE_ERROR : EFI_SUCCESS;
+  }
 
+Done:
+    gBS->RestoreTPL (OldTpl);
     return Status;
-  }
 }
 
 EFI_STATUS
@@ -1488,20 +1519,28 @@ Returns:
 --*/
 // TODO:    EFI_INVALID_PARAMETER - add return value to function comment
 {
+  EFI_STATUS            Status;
   UNIX_EFI_FILE_PRIVATE *PrivateFile;
+  EFI_TPL               OldTpl;
 
   if (This == NULL || Position == NULL) {
     return EFI_INVALID_PARAMETER;
   }
 
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  
   PrivateFile   = UNIX_EFI_FILE_PRIVATE_DATA_FROM_THIS (This);
 
   if (PrivateFile->IsDirectoryPath) {
-    return EFI_UNSUPPORTED;
+    Status = EFI_UNSUPPORTED;
   } else {
     *Position = PrivateFile->UnixThunk->Lseek (PrivateFile->fd, 0, SEEK_CUR);
-    return (*Position == (UINT64) -1) ? EFI_DEVICE_ERROR : EFI_SUCCESS;
+    Status = (*Position == (UINT64) -1) ? EFI_DEVICE_ERROR : EFI_SUCCESS;
   }
+
+Done:
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  return Status;
 }
 
 EFI_STATUS
@@ -1553,11 +1592,14 @@ Returns:
   INTN                              UnixStatus;
   UNIX_SIMPLE_FILE_SYSTEM_PRIVATE *PrivateRoot;
   struct statfs                     buf;
+  EFI_TPL                           OldTpl;
 
   if (This == NULL || InformationType == NULL || BufferSize == NULL) {
     return EFI_INVALID_PARAMETER;
   }
 
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+    
   PrivateFile = UNIX_EFI_FILE_PRIVATE_DATA_FROM_THIS (This);
   PrivateRoot = UNIX_SIMPLE_FILE_SYSTEM_PRIVATE_DATA_FROM_THIS (PrivateFile->SimpleFileSystem);
 
@@ -1565,16 +1607,18 @@ Returns:
 
   if (CompareGuid (InformationType, &gEfiFileInfoGuid)) {
     Status = UnixSimpleFileSystemFileInfo (PrivateFile, NULL, BufferSize, Buffer);
-  }
-  else if (CompareGuid (InformationType, &gEfiFileSystemInfoGuid)) {
+  } else if (CompareGuid (InformationType, &gEfiFileSystemInfoGuid)) {
     if (*BufferSize < SIZE_OF_EFI_FILE_SYSTEM_INFO + StrSize (PrivateRoot->VolumeLabel)) {
       *BufferSize = SIZE_OF_EFI_FILE_SYSTEM_INFO + StrSize (PrivateRoot->VolumeLabel);
-      return EFI_BUFFER_TOO_SMALL;
+      Status = EFI_BUFFER_TOO_SMALL;
+      goto Done;
     }
 
     UnixStatus = PrivateFile->UnixThunk->StatFs (PrivateFile->FileName, &buf);
-    if (UnixStatus < 0)
-        return EFI_DEVICE_ERROR;
+    if (UnixStatus < 0) {
+        Status = EFI_DEVICE_ERROR;
+        goto Done;
+    }
 
     FileSystemInfoBuffer            = (EFI_FILE_SYSTEM_INFO *) Buffer;
     FileSystemInfoBuffer->Size      = SIZE_OF_EFI_FILE_SYSTEM_INFO + StrSize (PrivateRoot->VolumeLabel);
@@ -1591,13 +1635,11 @@ Returns:
     StrCpy ((CHAR16 *) FileSystemInfoBuffer->VolumeLabel, PrivateRoot->VolumeLabel);
     *BufferSize = SIZE_OF_EFI_FILE_SYSTEM_INFO + StrSize (PrivateRoot->VolumeLabel);
     Status      = EFI_SUCCESS;
-  }
-
-  else if (CompareGuid (InformationType,
-			&gEfiFileSystemVolumeLabelInfoIdGuid)) {
+  } else if (CompareGuid (InformationType, &gEfiFileSystemVolumeLabelInfoIdGuid){
     if (*BufferSize < StrSize (PrivateRoot->VolumeLabel)) {
       *BufferSize = StrSize (PrivateRoot->VolumeLabel);
-      return EFI_BUFFER_TOO_SMALL;
+      Status = EFI_BUFFER_TOO_SMALL;
+      goto Done;
     }
 
     StrCpy ((CHAR16 *) Buffer, PrivateRoot->VolumeLabel);
@@ -1605,6 +1647,8 @@ Returns:
     Status      = EFI_SUCCESS;
   }
 
+Done:
+  gBS->RestoreTPL (OldTpl);
   return Status;
 }
 
@@ -1662,6 +1706,7 @@ Returns:
   EFI_FILE_INFO                     *NewFileInfo;
   EFI_STATUS                        Status;
   UINTN                             OldInfoSize;
+  EFI_TPL                           OldTpl;
   mode_t                            NewAttr;
   struct stat                       OldAttr;
   CHAR8                             *OldFileName;
@@ -1685,6 +1730,8 @@ Returns:
     return EFI_INVALID_PARAMETER;
   }
 
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  
   //
   // Initialise locals.
   //
@@ -1701,7 +1748,8 @@ Returns:
   //
   if (CompareGuid (InformationType, &gEfiFileSystemInfoGuid)) {
     if (BufferSize < SIZE_OF_EFI_FILE_SYSTEM_INFO + StrSize (PrivateRoot->VolumeLabel)) {
-      return EFI_BAD_BUFFER_SIZE;
+      Status = EFI_BAD_BUFFER_SIZE;
+      goto Done;
     }
 
     NewFileSystemInfo = (EFI_FILE_SYSTEM_INFO *) Buffer;
@@ -1721,7 +1769,8 @@ Returns:
 
     StrCpy (PrivateRoot->VolumeLabel, NewFileSystemInfo->VolumeLabel);
 
-    return EFI_SUCCESS;
+    Status = EFI_SUCCESS;
+    goto Done;
   }
 
   //
@@ -1729,20 +1778,24 @@ Returns:
   //
   if (CompareGuid (InformationType, &gEfiFileSystemVolumeLabelInfoIdGuid)) {
     if (BufferSize < StrSize (PrivateRoot->VolumeLabel)) {
-      return EFI_BAD_BUFFER_SIZE;
+      Status = EFI_BAD_BUFFER_SIZE;
+      goto Done;
     }
 
     StrCpy (PrivateRoot->VolumeLabel, (CHAR16 *) Buffer);
 
-    return EFI_SUCCESS;
+    Status = EFI_SUCCESS;
+    goto Done;
   }
 
   if (!CompareGuid (InformationType, &gEfiFileInfoGuid)) {
-    return EFI_UNSUPPORTED;
+    Status = EFI_UNSUPPORTED;
+    goto Done;
   }
 
   if (BufferSize < SIZE_OF_EFI_FILE_INFO) {
-    return EFI_BAD_BUFFER_SIZE;
+    Status = EFI_BAD_BUFFER_SIZE;
+    goto Done;
   }
 
   //
@@ -1758,7 +1811,8 @@ Returns:
       (NewFileInfo->Attribute &~(EFI_FILE_VALID_ATTR)) ||
       (sizeof (UINTN) == 4 && NewFileInfo->Size > 0xFFFFFFFF)
       ) {
-    return EFI_INVALID_PARAMETER;
+    Status = EFI_INVALID_PARAMETER;
+    goto Done;
   }
 
   //
@@ -2039,6 +2093,8 @@ Done:
     gBS->FreePool (NewFileName);
   }
 
+  gBS->RestoreTPL (OldTpl);
+  
   return Status;
 }
 
@@ -2077,30 +2133,43 @@ Returns:
 // TODO:    EFI_INVALID_PARAMETER - add return value to function comment
 {
   UNIX_EFI_FILE_PRIVATE     *PrivateFile;
+  EFI_STATUS                Status;
+  EFI_TPL                   OldTpl;
 
   if (This == NULL) {
     return EFI_INVALID_PARAMETER;
   }
 
+  OldTpl = gBS->RaiseTPL (EFI_TPL_CALLBACK);
+  
   PrivateFile = UNIX_EFI_FILE_PRIVATE_DATA_FROM_THIS (This);
 
 
   if (PrivateFile->IsDirectoryPath) {
-    return EFI_SUCCESS;
+    Status = EFI_SUCCESS;
+    goto Done;
   }
 
   if (PrivateFile->IsOpenedByRead) {
-    return EFI_ACCESS_DENIED;
+    Status = EFI_ACCESS_DENIED;
+    goto Done;
   }
 
   if (PrivateFile->fd < 0) {
-    return EFI_DEVICE_ERROR;
+    Status = EFI_DEVICE_ERROR;
+    goto Done;
   }
 
-  return PrivateFile->UnixThunk->FSync (PrivateFile->fd) == 0 ? EFI_SUCCESS : EFI_DEVICE_ERROR;
+  PrivateFile->UnixThunk->FSync (PrivateFile->fd) == 0 ? EFI_SUCCESS : EFI_DEVICE_ERROR;
+
+Done:
+  gBS->RestoreTPL (OldTpl);
+
+  return Status;
 
   //
   // bugbug: - Use Unix error reporting.
   //
 }
 
+