ovmf: Fix build with gcc8

Signed-off-by: Khem Raj <raj.khem@gmail.com>

5 files changed, 296 insertions, 0 deletions

diff --git a/meta/recipes-core/ovmf/ovmf/0001-BaseTools-header.makefile-add-Wno-stringop-truncatio.patch b/meta/recipes-core/ovmf/ovmf/0001-BaseTools-header.makefile-add-Wno-stringop-truncatio.patch
new file mode 100644
index 0000000000..342fcc6231
--- /dev/null
+++ b/meta/recipes-core/ovmf/ovmf/0001-BaseTools-header.makefile-add-Wno-stringop-truncatio.patch
@@ -0,0 +1,71 @@
+From 9fce4bab014b9aa618060eba13d6dd04b0fa1b70 Mon Sep 17 00:00:00 2001
+From: Laszlo Ersek <lersek@redhat.com>
+Date: Fri, 2 Mar 2018 17:11:52 +0100
+Subject: [PATCH 1/4] BaseTools/header.makefile: add "-Wno-stringop-truncation"
+
+gcc-8 (which is part of Fedora 28) enables the new warning
+"-Wstringop-truncation" 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 bounded string manipulation functions such as strncat,
+> strncpy, and stpncpy that may either truncate the copied string or leave
+> the destination unchanged.
+
+It breaks the BaseTools build with:
+
+> EfiUtilityMsgs.c: In function 'PrintMessage':
+> EfiUtilityMsgs.c:484:9: error: 'strncat' output may be truncated copying
+> between 0 and 511 bytes from a string of length 511
+> [-Werror=stringop-truncation]
+>          strncat (Line, Line2, MAX_LINE_LEN - strlen (Line) - 1);
+>          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+> EfiUtilityMsgs.c:469:9: error: 'strncat' output may be truncated copying
+> between 0 and 511 bytes from a string of length 511
+> [-Werror=stringop-truncation]
+>          strncat (Line, Line2, MAX_LINE_LEN - strlen (Line) - 1);
+>          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+> EfiUtilityMsgs.c:511:5: error: 'strncat' output may be truncated copying
+> between 0 and 511 bytes from a string of length 511
+> [-Werror=stringop-truncation]
+>      strncat (Line, Line2, MAX_LINE_LEN - strlen (Line) - 1);
+>      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The right way to fix the warning would be to implement string concat with
+snprintf(). However, Microsoft does not appear to support snprintf()
+before VS2015
+<https://stackoverflow.com/questions/2915672/snprintf-and-visual-studio-2010>,
+so we just have to shut up the warning. The strncat() calls flagged above
+are valid BTW.
+
+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>
+Contributed-under: TianoCore Contribution Agreement 1.1
+Signed-off-by: Laszlo Ersek <lersek@redhat.com>
+Reviewed-by: Liming Gao <liming.gao@intel.com>
+---
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Backport
+
+ BaseTools/Source/C/Makefiles/header.makefile | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+Index: git/BaseTools/Source/C/Makefiles/header.makefile
+===================================================================
+--- git.orig/BaseTools/Source/C/Makefiles/header.makefile
++++ git/BaseTools/Source/C/Makefiles/header.makefile
+@@ -47,9 +47,9 @@ INCLUDE = $(TOOL_INCLUDE) -I $(MAKEROOT)
+ BUILD_CPPFLAGS += $(INCLUDE) -O2

+ ifeq ($(DARWIN),Darwin)

+ # assume clang or clang compatible flags on OS X

+-BUILD_CFLAGS += -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-self-assign -Wno-unused-result -nostdlib -c -g

++BUILD_CFLAGS += -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-stringop-truncation -Wno-self-assign -Wno-unused-result -nostdlib -c -g

+ else

+-BUILD_CFLAGS += -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-unused-result -nostdlib -c -g

++BUILD_CFLAGS += -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-stringop-truncation -Wno-unused-result -nostdlib -c -g

+ endif

+ BUILD_LFLAGS = $(LDFLAGS)

+ BUILD_CXXFLAGS += -Wno-unused-result

diff --git a/meta/recipes-core/ovmf/ovmf/0002-BaseTools-header.makefile-add-Wno-restrict.patch b/meta/recipes-core/ovmf/ovmf/0002-BaseTools-header.makefile-add-Wno-restrict.patch
new file mode 100644
index 0000000000..a076665c33
--- /dev/null
+++ b/meta/recipes-core/ovmf/ovmf/0002-BaseTools-header.makefile-add-Wno-restrict.patch
@@ -0,0 +1,102 @@
+From 86dbdac5a25bd23deb4a0e0a97b527407e02184d Mon Sep 17 00:00:00 2001
+From: Laszlo Ersek <lersek@redhat.com>
+Date: Fri, 2 Mar 2018 17:11:52 +0100
+Subject: [PATCH 2/4] BaseTools/header.makefile: add "-Wno-restrict"
+
+gcc-8 (which is part of Fedora 28) enables the new warning
+"-Wrestrict" in "-Wall". This warning is documented in detail
+at <https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html>; the
+introduction says
+
+> Warn when an object referenced by a restrict-qualified parameter (or, in
+> C++, a __restrict-qualified parameter) is aliased by another argument,
+> or when copies between such objects overlap.
+
+It breaks the BaseTools build (in the Brotli compression library) with:
+
+> In function 'ProcessCommandsInternal',
+>     inlined from 'ProcessCommands' at dec/decode.c:1828:10:
+> dec/decode.c:1781:9: error: 'memcpy' accessing between 17 and 2147483631
+> bytes at offsets 16 and 16 overlaps between 17 and 2147483631 bytes at
+> offset 16 [-Werror=restrict]
+>          memcpy(copy_dst + 16, copy_src + 16, (size_t)(i - 16));
+>          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+> In function 'ProcessCommandsInternal',
+>     inlined from 'SafeProcessCommands' at dec/decode.c:1833:10:
+> dec/decode.c:1781:9: error: 'memcpy' accessing between 17 and 2147483631
+> bytes at offsets 16 and 16 overlaps between 17 and 2147483631 bytes at
+> offset 16 [-Werror=restrict]
+>          memcpy(copy_dst + 16, copy_src + 16, (size_t)(i - 16));
+>          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Paolo Bonzini <pbonzini@redhat.com> analyzed the Brotli source in detail,
+and concluded that the warning is a false positive:
+
+> This seems safe to me, because it's preceded by:
+>
+>     uint8_t* copy_dst = &s->ringbuffer[pos];
+>     uint8_t* copy_src = &s->ringbuffer[src_start];
+>     int dst_end = pos + i;
+>     int src_end = src_start + i;
+>     if (src_end > pos && dst_end > src_start) {
+>       /* Regions intersect. */
+>       goto CommandPostWrapCopy;
+>     }
+>
+> If [src_start, src_start + i) and [pos, pos + i) don't intersect, then
+> neither do [src_start + 16, src_start + i) and [pos + 16, pos + i).
+>
+> The if seems okay:
+>
+>        (src_start + i > pos && pos + i > src_start)
+>
+> which can be rewritten to:
+>
+>        (pos < src_start + i && src_start < pos + i)
+>
+> Then the numbers are in one of these two orders:
+>
+>      pos <= src_start < pos + i <= src_start + i
+>      src_start <= pos < src_start + i <= pos + i
+>
+> These two would be allowed by the "if", but they can only happen if pos
+> == src_start so they degenerate to the same two orders above:
+>
+>      pos <= src_start < src_start + i <= pos + i
+>      src_start <= pos < pos + i <= src_start + i
+>
+> So it is a false positive in GCC.
+
+Disable the warning for now.
+
+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>
+---
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Backport
+ BaseTools/Source/C/Makefiles/header.makefile | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+Index: git/BaseTools/Source/C/Makefiles/header.makefile
+===================================================================
+--- git.orig/BaseTools/Source/C/Makefiles/header.makefile
++++ git/BaseTools/Source/C/Makefiles/header.makefile
+@@ -47,9 +47,9 @@ INCLUDE = $(TOOL_INCLUDE) -I $(MAKEROOT)
+ BUILD_CPPFLAGS += $(INCLUDE) -O2

+ ifeq ($(DARWIN),Darwin)

+ # assume clang or clang compatible flags on OS X

+-BUILD_CFLAGS += -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-stringop-truncation -Wno-self-assign -Wno-unused-result -nostdlib -c -g

++BUILD_CFLAGS += -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-stringop-truncation -Wno-restrict -Wno-self-assign -Wno-unused-result -nostdlib -c -g

+ else

+-BUILD_CFLAGS += -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-stringop-truncation -Wno-unused-result -nostdlib -c -g

++BUILD_CFLAGS += -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-stringop-truncation -Wno-restrict -Wno-unused-result -nostdlib -c -g

+ endif

+ BUILD_LFLAGS = $(LDFLAGS)

+ BUILD_CXXFLAGS += -Wno-unused-result

diff --git a/meta/recipes-core/ovmf/ovmf/0003-BaseTools-header.makefile-revert-gcc-8-Wno-xxx-optio.patch b/meta/recipes-core/ovmf/ovmf/0003-BaseTools-header.makefile-revert-gcc-8-Wno-xxx-optio.patch
new file mode 100644
index 0000000000..920723e326
--- /dev/null
+++ b/meta/recipes-core/ovmf/ovmf/0003-BaseTools-header.makefile-revert-gcc-8-Wno-xxx-optio.patch
@@ -0,0 +1,53 @@
+From 6866325dd9c17412e555974dde41f9631224db52 Mon Sep 17 00:00:00 2001
+From: Laszlo Ersek <lersek@redhat.com>
+Date: Wed, 7 Mar 2018 10:17:28 +0100
+Subject: [PATCH 3/4] BaseTools/header.makefile: revert gcc-8 "-Wno-xxx"
+ options on OSX
+
+I recently added the gcc-8 specific "-Wno-stringop-truncation" and
+"-Wno-restrict" options to BUILD_CFLAGS, both for "Darwin" (XCODE5 /
+clang, OSX) and otherwise (gcc, Linux / Cygwin).
+
+I also regression-tested the change with gcc-4.8 on Linux -- gcc-4.8 does
+not know either of the (gcc-8 specific) "-Wno-stringop-truncation" and
+"-Wno-restrict" options, yet the build completed fine (by GCC design).
+
+Regarding OSX, my expectation was that
+
+- XCODE5 / clang would either recognize these warnings options (because
+  clang does recognize most -W options of gcc),
+
+- or, similarly to gcc, clang would simply ignore the "-Wno-xxx" flags
+  that it didn't recognize.
+
+Neither is the case; the new flags have broken the BaseTools build on OSX.
+Revert them (for OSX only).
+
+Cc: Liming Gao <liming.gao@intel.com>
+Cc: Yonghong Zhu <yonghong.zhu@intel.com>
+Reported-by: Liming Gao <liming.gao@intel.com>
+Fixes: 1d212a83df0eaf32a6f5d4159beb2d77832e0231
+Fixes: 9222154ae7b3eef75ae88cdb56158256227cb929
+Contributed-under: TianoCore Contribution Agreement 1.1
+Signed-off-by: Laszlo Ersek <lersek@redhat.com>
+Reviewed-by: Liming Gao <liming.gao@intel.com>
+Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
+---
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Backport
+ BaseTools/Source/C/Makefiles/header.makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+Index: git/BaseTools/Source/C/Makefiles/header.makefile
+===================================================================
+--- git.orig/BaseTools/Source/C/Makefiles/header.makefile
++++ git/BaseTools/Source/C/Makefiles/header.makefile
+@@ -47,7 +47,7 @@ INCLUDE = $(TOOL_INCLUDE) -I $(MAKEROOT)
+ BUILD_CPPFLAGS += $(INCLUDE) -O2

+ ifeq ($(DARWIN),Darwin)

+ # assume clang or clang compatible flags on OS X

+-BUILD_CFLAGS += -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-stringop-truncation -Wno-restrict -Wno-self-assign -Wno-unused-result -nostdlib -c -g

++BUILD_CFLAGS += -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-self-assign -Wno-unused-result -nostdlib -c -g

+ else

+ BUILD_CFLAGS += -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-stringop-truncation -Wno-restrict -Wno-unused-result -nostdlib -c -g

+ endif

diff --git a/meta/recipes-core/ovmf/ovmf/0004-BaseTools-GenVtf-silence-false-stringop-overflow-war.patch b/meta/recipes-core/ovmf/ovmf/0004-BaseTools-GenVtf-silence-false-stringop-overflow-war.patch
new file mode 100644
index 0000000000..7ad7cdf0ce
--- /dev/null
+++ b/meta/recipes-core/ovmf/ovmf/0004-BaseTools-GenVtf-silence-false-stringop-overflow-war.patch
@@ -0,0 +1,66 @@
+From dfb42a5bff78d9239a80731e337855234badef3e Mon Sep 17 00:00:00 2001
+From: Laszlo Ersek <lersek@redhat.com>
+Date: Fri, 2 Mar 2018 17:11:52 +0100
+Subject: [PATCH 4/4] BaseTools/GenVtf: silence false "stringop-overflow"
+ warning with memcpy()
+
+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>
+---
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Backport
+ 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 2ae9a7be2c..0cd33e71e9 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 (

+-- 
+2.17.0
+
diff --git a/meta/recipes-core/ovmf/ovmf_git.bb b/meta/recipes-core/ovmf/ovmf_git.bb
index 8750b3c528..212530acbf 100644
--- a/meta/recipes-core/ovmf/ovmf_git.bb
+++ b/meta/recipes-core/ovmf/ovmf_git.bb
@@ -19,6 +19,10 @@ SRC_URI = "git://github.com/tianocore/edk2.git;branch=master \
 	file://0004-ovmf-enable-long-path-file.patch \
 	file://VfrCompile-increase-path-length-limit.patch \
 	file://no-stack-protector-all-archs.patch \
+	file://0001-BaseTools-header.makefile-add-Wno-stringop-truncatio.patch \
+	file://0002-BaseTools-header.makefile-add-Wno-restrict.patch \
+	file://0003-BaseTools-header.makefile-revert-gcc-8-Wno-xxx-optio.patch \
+	file://0004-BaseTools-GenVtf-silence-false-stringop-overflow-war.patch \
         "
 UPSTREAM_VERSION_UNKNOWN = "1"