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From ed8d931e35f81d8566835a579caf7d61368f85b7 Mon Sep 17 00:00:00 2001
From: Evangelos Foutras <evangelos@foutrelis.com>
Date: Tue, 27 Sep 2022 22:20:41 +0000
Subject: [PATCH] unbundle/jsoncpp: avoid CFI faults with is_cfi=true
Ensure jsoncpp symbols have public visibility and are thus excluded from
CFI checks and whole-program optimization. This is achieved by defining
JSON_DLL_BUILD which in turn causes json/config.h to define JSON_API as
__attribute__((visibility("default"))). The latter macro is used to tag
jsoncpp classes and namespace functions throughout jsoncpp's headers.
BUG=1365218
Change-Id: I56277737b7d9ecaeb5e17c8d21a2e55f3d5d5bc9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3919652
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1052077}
---
build/linux/unbundle/jsoncpp.gn | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/build/linux/unbundle/jsoncpp.gn b/build/linux/unbundle/jsoncpp.gn
index 544f9d13c9..e84a0ef27a 100644
--- a/build/linux/unbundle/jsoncpp.gn
+++ b/build/linux/unbundle/jsoncpp.gn
@@ -3,6 +3,11 @@ import("//build/shim_headers.gni")
pkg_config("jsoncpp_config") {
packages = [ "jsoncpp" ]
+
+ # Defining JSON_DLL_BUILD applies public visibility to jsoncpp classes
+ # thus deactivating CFI checks for them. This avoids CFI violations in
+ # virtual calls to system jsoncpp library (https://crbug.com/1365218).
+ defines = [ "JSON_DLL_BUILD" ]
}
shim_headers("jsoncpp_shim") {
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