[PATCH v2] OvmfPkg: strip build paths in release builds

["Ross Burton" <ross@burtonini.com>]

GenFw will embed a NB10 section which contains the path to the input file,
which means the output files have build paths embedded in them.  To reduce
information leakage and ensure reproducible builds, pass --zero in release
builds to remove this information.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3256
Signed-off-by: Ross Burton <ross.burton@arm.com>
---
 OvmfPkg/AmdSev/AmdSevX64.dsc | 1 +
 OvmfPkg/Bhyve/BhyveX64.dsc   | 1 +
 OvmfPkg/OvmfPkgIa32.dsc      | 1 +
 OvmfPkg/OvmfPkgIa32X64.dsc   | 1 +
 OvmfPkg/OvmfPkgX64.dsc       | 1 +
 OvmfPkg/OvmfXen.dsc          | 1 +
 6 files changed, 6 insertions(+)

diff --git a/OvmfPkg/AmdSev/AmdSevX64.dsc b/OvmfPkg/AmdSev/AmdSevX64.dsc
index 65c42284d9..69a05feea9 100644
--- a/OvmfPkg/AmdSev/AmdSevX64.dsc
+++ b/OvmfPkg/AmdSev/AmdSevX64.dsc
@@ -78,6 +78,7 @@
   GCC:*_*_X64_GENFW_FLAGS   = --keepexceptiontable
   INTEL:*_*_X64_GENFW_FLAGS = --keepexceptiontable
 !endif
+  RELEASE_*_*_GENFW_FLAGS = --zero
 
   #
   # Disable deprecated APIs.
diff --git a/OvmfPkg/Bhyve/BhyveX64.dsc b/OvmfPkg/Bhyve/BhyveX64.dsc
index 4a1cdf5aca..132f55cf69 100644
--- a/OvmfPkg/Bhyve/BhyveX64.dsc
+++ b/OvmfPkg/Bhyve/BhyveX64.dsc
@@ -76,6 +76,7 @@
   GCC:*_*_X64_GENFW_FLAGS   = --keepexceptiontable
   INTEL:*_*_X64_GENFW_FLAGS = --keepexceptiontable
 !endif
+  RELEASE_*_*_GENFW_FLAGS = --zero
 
   #
   # Disable deprecated APIs.
diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index 1eaf3e99c6..93c209950c 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -80,6 +80,7 @@
 !if $(TOOL_CHAIN_TAG) != "XCODE5" && $(TOOL_CHAIN_TAG) != "CLANGPDB"
   GCC:*_*_*_CC_FLAGS                   = -mno-mmx -mno-sse
 !endif
+  RELEASE_*_*_GENFW_FLAGS = --zero
 
   #
   # Disable deprecated APIs.
diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
index 4a5a430147..97cc438250 100644
--- a/OvmfPkg/OvmfPkgIa32X64.dsc
+++ b/OvmfPkg/OvmfPkgIa32X64.dsc
@@ -84,6 +84,7 @@
   GCC:*_*_X64_GENFW_FLAGS   = --keepexceptiontable
   INTEL:*_*_X64_GENFW_FLAGS = --keepexceptiontable
 !endif
+  RELEASE_*_*_GENFW_FLAGS = --zero
 
   #
   # Disable deprecated APIs.
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index d4d601b444..f544fb04bf 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -84,6 +84,7 @@
   GCC:*_*_X64_GENFW_FLAGS   = --keepexceptiontable
   INTEL:*_*_X64_GENFW_FLAGS = --keepexceptiontable
 !endif
+  RELEASE_*_*_GENFW_FLAGS = --zero
 
   #
   # Disable deprecated APIs.
diff --git a/OvmfPkg/OvmfXen.dsc b/OvmfPkg/OvmfXen.dsc
index 507029404f..fcaa35acf1 100644
--- a/OvmfPkg/OvmfXen.dsc
+++ b/OvmfPkg/OvmfXen.dsc
@@ -74,6 +74,7 @@
   GCC:*_*_X64_GENFW_FLAGS   = --keepexceptiontable
   INTEL:*_*_X64_GENFW_FLAGS = --keepexceptiontable
 !endif
+  RELEASE_*_*_GENFW_FLAGS = --zero
 
   #
   # Disable deprecated APIs.
-- 
2.25.1