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