File edk2_genvtf_gcc8.patch of Package edk2-hikey

Overview Repositories Revisions Requests Users Attributes Meta

File edk2_genvtf_gcc8.patch of Package edk2-hikey

From cae9c86e2b833c252959c0ec89c74f1d79ff6ea0 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Fri, 2 Mar 2018 17:11:52 +0100
Subject: [PATCH] BaseTools/GenVtf: silence false "stringop-overflow" warning
 with memcpy()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

gcc-8 (which is part of Fedora 28) enables the new warning
"-Wstringop-overflow" in "-Wall". This warning is documented in detail at
<https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html>; the
introduction says

> Warn for calls to string manipulation functions such as memcpy and
> strcpy that are determined to overflow the destination buffer.

It breaks the BaseTools build with:

> GenVtf.c: In function 'ConvertVersionInfo':
> GenVtf.c:132:7: error: 'strncpy' specified bound depends on the length
> of the source argument [-Werror=stringop-overflow=]
>        strncpy (TemStr + 4 - Length, Str, Length);
>        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> GenVtf.c:130:14: note: length computed here
>      Length = strlen(Str);
>               ^~~~~~~~~~~

It is a false positive because, while the bound equals the length of the
source argument, the destination pointer is moved back towards the
beginning of the destination buffer by the same amount (and this amount is
range-checked first, so we can't precede the start of the dest buffer).

Replace both strncpy() calls with memcpy().

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Cole Robinson <crobinso@redhat.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Reported-by: Cole Robinson <crobinso@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
(cherry picked from commit 9de306701312f986c9638cb819d3f1f848d55cab)
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 BaseTools/Source/C/GenVtf/GenVtf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/BaseTools/Source/C/GenVtf/GenVtf.c b/BaseTools/Source/C/GenVtf/GenVtf.c
index acc142a6d1..815b47ad50 100644
--- a/BaseTools/Source/C/GenVtf/GenVtf.c
+++ b/BaseTools/Source/C/GenVtf/GenVtf.c
@@ -129,9 +129,9 @@ Returns:
   } else {
     Length = strlen(Str);
     if (Length < 4) {
-      strncpy (TemStr + 4 - Length, Str, Length);
+      memcpy (TemStr + 4 - Length, Str, Length);
     } else {
-      strncpy (TemStr, Str + Length - 4, 4);
+      memcpy (TemStr, Str + Length - 4, 4);
     }
   
     sscanf (
-- 
2.16.4

Places

File edk2_genvtf_gcc8.patch of Package edk2-hikey

Places