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From: "Savva Mitrofanov" <savvamtr@gmail.com>
To: devel@edk2.groups.io
Cc: "Marvin Häuser" <mhaeuser@posteo.de>,
	"Pedro Falcato" <pedro.falcato@gmail.com>,
	"Vitaly Cheptsov" <vit9696@protonmail.com>
Subject: [edk2-platforms][PATCH v4 10/12] Ext4Pkg: Fixes build on MSVC
Date: Thu,  2 Feb 2023 16:21:31 +0600	[thread overview]
Message-ID: <20230202102133.51606-11-savvamtr@gmail.com> (raw)
In-Reply-To: <20230202102133.51606-1-savvamtr@gmail.com>

Accessing array using index of uint64 type makes MSVC compiler to
include `__allmul` function in NOOPT which is not referenced in IA32.
So we null-terminates string using ReadSize, which should be equal to
SymlinkSizeTmp after correct reading. Also adds missing MultU64x32
in Ext4Read.

Cc: Marvin Häuser <mhaeuser@posteo.de>
Cc: Pedro Falcato <pedro.falcato@gmail.com>
Cc: Vitaly Cheptsov <vit9696@protonmail.com>
Fixes: 7c46116b0e18 ("Ext4Pkg: Add ext2/3 support")
Fixes: e81432fbacb7 ("Ext4Pkg: Add symbolic links support")
Signed-off-by: Savva Mitrofanov <savvamtr@gmail.com>
Reviewed-by: Marvin Häuser <mhaeuser@posteo.de>
---
 Features/Ext4Pkg/Ext4Dxe/Inode.c   |  4 ++--
 Features/Ext4Pkg/Ext4Dxe/Symlink.c | 12 ++++++------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/Features/Ext4Pkg/Ext4Dxe/Inode.c b/Features/Ext4Pkg/Ext4Dxe/Inode.c
index 90e3eb88f523..8db051d3c444 100644
--- a/Features/Ext4Pkg/Ext4Dxe/Inode.c
+++ b/Features/Ext4Pkg/Ext4Dxe/Inode.c
@@ -152,7 +152,7 @@ Ext4Read (
       } else {
         // Uninitialized extents behave exactly the same as file holes, except they have
         // blocks already allocated to them.
-        HoleLen = (Ext4GetExtentLength (&Extent) * Partition->BlockSize) - HoleOff;
+        HoleLen = MultU64x32 (Ext4GetExtentLength (&Extent), Partition->BlockSize) - HoleOff;
       }
 
       WasRead = HoleLen > RemainingRead ? RemainingRead : (UINTN)HoleLen;
@@ -166,7 +166,7 @@ Ext4Read (
                            Partition->BlockSize
                            );
       ExtentLengthBytes  = Extent.ee_len * Partition->BlockSize;
-      ExtentLogicalBytes = (UINT64)Extent.ee_block * Partition->BlockSize;
+      ExtentLogicalBytes = MultU64x32 ((UINT64)Extent.ee_block, Partition->BlockSize);
       ExtentOffset       = CurrentSeek - ExtentLogicalBytes;
       ExtentMayRead      = (UINTN)(ExtentLengthBytes - ExtentOffset);
 
diff --git a/Features/Ext4Pkg/Ext4Dxe/Symlink.c b/Features/Ext4Pkg/Ext4Dxe/Symlink.c
index 19b357ac6ba0..8b1511a38b55 100644
--- a/Features/Ext4Pkg/Ext4Dxe/Symlink.c
+++ b/Features/Ext4Pkg/Ext4Dxe/Symlink.c
@@ -1,7 +1,7 @@
 /** @file
   Symbolic links routines
 
-  Copyright (c) 2022 Savva Mitrofanov All rights reserved.
+  Copyright (c) 2022-2023 Savva Mitrofanov All rights reserved.
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
 
@@ -155,11 +155,6 @@ Ext4ReadSlowSymlink (
     return Status;
   }
 
-  //
-  // Add null-terminator
-  //
-  SymlinkTmp[SymlinkSizeTmp] = '\0';
-
   if (SymlinkSizeTmp != ReadSize) {
     DEBUG ((
       DEBUG_FS,
@@ -168,6 +163,11 @@ Ext4ReadSlowSymlink (
     return EFI_VOLUME_CORRUPTED;
   }
 
+  //
+  // Add null-terminator
+  //
+  SymlinkTmp[ReadSize] = '\0';
+
   *AsciiSymlinkSize = SymlinkAllocateSize;
   *AsciiSymlink     = SymlinkTmp;
 
-- 
2.39.1


  parent reply	other threads:[~2023-02-02 10:21 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-02 10:21 [edk2-platforms][PATCH v4 00/12] Ext4Pkg: Code correctness and security improvements Savva Mitrofanov
2023-02-02 10:21 ` [edk2-platforms][PATCH v4 01/12] Ext4Pkg: Fix memory leak in Ext4RetrieveDirent Savva Mitrofanov
2023-02-02 10:21 ` [edk2-platforms][PATCH v4 02/12] Ext4Pkg: Fix incorrect checksum metadata feature check Savva Mitrofanov
2023-02-02 10:21 ` [edk2-platforms][PATCH v4 03/12] Ext4Pkg: Fix division by zero by adding check for s_inodes_per_group Savva Mitrofanov
2023-02-02 10:21 ` [edk2-platforms][PATCH v4 04/12] Ext4Pkg: Add inode number validity check Savva Mitrofanov
2023-02-02 10:32   ` Marvin Häuser
2023-02-02 10:21 ` [edk2-platforms][PATCH v4 05/12] Ext4Pkg: Fix shift out of bounds in Ext4OpenSuperblock Savva Mitrofanov
2023-02-02 10:21 ` [edk2-platforms][PATCH v4 06/12] Ext4Pkg: Corrects integer overflow check logic in DiskUtil Savva Mitrofanov
2023-02-02 10:31   ` Marvin Häuser
2023-02-02 10:21 ` [edk2-platforms][PATCH v4 07/12] Ext4Pkg: Check that source file is directory in Ext4OpenInternal Savva Mitrofanov
2023-02-02 10:21 ` [edk2-platforms][PATCH v4 08/12] Ext4Pkg: Check VolumeName allocation correctness in Ext4GetVolumeName Savva Mitrofanov
2023-02-02 10:21 ` [edk2-platforms][PATCH v4 09/12] Ext4Pkg: Add missing exit Status in Ext4OpenDirent Savva Mitrofanov
2023-02-02 10:21 ` Savva Mitrofanov [this message]
2023-02-02 10:21 ` [edk2-platforms][PATCH v4 11/12] Ext4Pkg: Filter out directory entry names containing \0 as invalid Savva Mitrofanov
2023-02-02 10:30   ` Marvin Häuser
2023-02-02 10:21 ` [edk2-platforms][PATCH v4 12/12] Ext4Pkg: Corrects memory leak in Ext4ReadSlowSymlink Savva Mitrofanov
2023-02-02 10:29   ` Marvin Häuser
2023-02-08 16:32 ` [edk2-platforms][PATCH v4 00/12] Ext4Pkg: Code correctness and security improvements Pedro Falcato

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