lang/gcc13: Fix Address sanitizer

Software compiled with -fsanitize=address fails to run with the error
message "ASan runtime does not come first in initial library list; you
should either link runtime to your application or manually preload it
with LD_PRELOAD".

This commit fixes the issue by ignoring the [vdso] loaded shared library
instead of linux-vdso.so.

To successfully run the software compiled with -fsanitize=address it is
still necessary to disable ASLR.

PR:		267751
Reported by:	yuri

Co-authored-by:	Andreas Tobler <andreast@gcc.gnu.org>

lang/gcc13/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	gcc
 PORTVERSION=	13.2.0
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	lang
 MASTER_SITES=	GCC
 PKGNAMESUFFIX=	${SUFFIX}

lang/gcc13/files/patch-libsanitizer_asan_asan__linux.cpp

@@ -0,0 +1,23 @@
+Since the vDSO shared librares on Linux and FreeBSD are called
+differently, the initialization order check fails on FreeBSD.
+This patch fixes it by ignoring [vdso] instead of linux-vdso.so.
+
+GCC gets the original file from the LLVM Project, so this patch should
+probably be upstreamed directly to the LLVM Project rather than to GCC.
+
+
+--- libsanitizer/asan/asan_linux.cpp.orig	2022-11-23 11:22:41 UTC
++++ libsanitizer/asan/asan_linux.cpp
+@@ -148,6 +148,12 @@ static int FindFirstDSOCallback(struct dl_phdr_info *i
+     return 0;
+ #    endif
+
++#    if SANITIZER_FREEBSD
++  // Ignore vDSO
++  if (internal_strncmp(info->dlpi_name, "[vdso]", sizeof("[vdso]") - 1) == 0)
++    return 0;
++#    endif
++
+   *name = info->dlpi_name;
+   return 1;
+ }

lang/gcc13/files/patch-libsanitizer_asan_asan__thread.cpp

@@ -0,0 +1,13 @@
+--- libsanitizer/asan/asan_thread.cpp.orig	2024-01-12 13:45:52 UTC
++++ libsanitizer/asan/asan_thread.cpp
+@@ -323,7 +323,9 @@ void AsanThread::ClearShadowForThreadStackAndTLS() {
+   if (tls_begin_ != tls_end_) {
+     uptr tls_begin_aligned = RoundDownTo(tls_begin_, ASAN_SHADOW_GRANULARITY);
+     uptr tls_end_aligned = RoundUpTo(tls_end_, ASAN_SHADOW_GRANULARITY);
+-    FastPoisonShadow(tls_begin_aligned, tls_end_aligned - tls_begin_aligned, 0);
++    FastPoisonShadowPartialRightRedzone(tls_begin_aligned,
++				tls_end_ - tls_begin_aligned,
++				tls_end_aligned - tls_end_, 0);
+   }
+ }
+