1 files changed, 40 insertions, 0 deletions
diff --git a/sys-apps/systemd-utils/files/251-revert-fortify-source-3-fix.patch b/sys-apps/systemd-utils/files/251-revert-fortify-source-3-fix.patch
new file mode 100644
index 000000000000..bbe45f85dcf2
--- /dev/null
+++ b/sys-apps/systemd-utils/files/251-revert-fortify-source-3-fix.patch
@@ -0,0 +1,40 @@
+From: Sam James <sam@gentoo.org>
+Date: Tue, 24 May 2022 23:21:50 +0100
+Subject: [PATCH] Revert "Support -D_FORTIFY_SOURCE=3 by using
+ __builtin_dynamic_object_size."
+
+Breaks Clang (even without F_S=3).
+
+This reverts commit 0bd292567a543d124cd303f7dd61169a209cae64.
+
+Bug: https://bugs.gentoo.org/841770
+Bug: https://github.com/systemd/systemd/issues/23150
+--- a/src/basic/alloc-util.h
++++ b/src/basic/alloc-util.h
+@@ -174,23 +174,13 @@ void* greedy_realloc0(void **p, size_t need, size_t size);
+  * is compatible with _FORTIFY_SOURCES. If _FORTIFY_SOURCES is used many memory operations will take the
+  * object size as returned by __builtin_object_size() into account. Hence, let's return the smaller size of
+  * malloc_usable_size() and __builtin_object_size() here, so that we definitely operate in safe territory by
+- * both the compiler's and libc's standards. Note that _FORTIFY_SOURCES=3 handles also dynamically allocated
+- * objects and thus it's safer using __builtin_dynamic_object_size if _FORTIFY_SOURCES=3 is used (#22801).
+- * Moreover, when NULL is passed malloc_usable_size() is documented to return zero, and
++ * both the compiler's and libc's standards. Note that __builtin_object_size() evaluates to SIZE_MAX if the
++ * size cannot be determined, hence the MIN() expression should be safe with dynamically sized memory,
++ * too. Moreover, when NULL is passed malloc_usable_size() is documented to return zero, and
+  * __builtin_object_size() returns SIZE_MAX too, hence we also return a sensible value of 0 in this corner
+  * case. */
+-
+-#if defined __has_builtin
+-#  if __has_builtin(__builtin_dynamic_object_size)
+-#    define MALLOC_SIZEOF_SAFE(x) \
+-        MIN(malloc_usable_size(x), __builtin_dynamic_object_size(x, 0))
+-#  endif
+-#endif
+-
+-#ifndef MALLOC_SIZEOF_SAFE
+ #define MALLOC_SIZEOF_SAFE(x) \
+         MIN(malloc_usable_size(x), __builtin_object_size(x, 0))
+-#endif
+ 
+ /* Inspired by ELEMENTSOF() but operates on malloc()'ed memory areas: typesafely returns the number of items
+  * that fit into the specified memory block */