diff --git a/ruby-1.8.6.230-string-str_buf_cat.patch b/ruby-1.8.6.230-string-str_buf_cat.patch
new file mode 100644
index 0000000..287ddc9
--- /dev/null
+++ b/ruby-1.8.6.230-string-str_buf_cat.patch
@@ -0,0 +1,28 @@
+diff -pruN ruby-1.8.6-p230.orig/string.c ruby-1.8.6-p230/string.c
+--- ruby-1.8.6-p230.orig/string.c	2008-06-20 18:24:53.000000000 +0900
++++ ruby-1.8.6-p230/string.c	2008-06-25 16:10:17.000000000 +0900
+@@ -693,9 +693,13 @@ str_buf_cat(str, ptr, len)
+     const char *ptr;
+     long len;
+ {
+-    long capa, total;
++    long capa, total, off = -1;
+ 
+     rb_str_modify(str);
++    if (ptr >= RSTRING(str)->ptr && ptr <= RSTRING(str)->ptr + RSTRING(str)->len) {
++	off = ptr - RSTRING(str)->ptr;
++    }
++    if (len == 0) return 0;
+     if (FL_TEST(str, STR_ASSOC)) {
+ 	FL_UNSET(str, STR_ASSOC);
+ 	capa = RSTRING(str)->aux.capa = RSTRING(str)->len;
+@@ -717,6 +721,9 @@ str_buf_cat(str, ptr, len)
+ 	}
+ 	RESIZE_CAPA(str, capa);
+     }
++    if (off != -1) {
++	ptr = RSTRING(str)->ptr + off;
++    }
+     memcpy(RSTRING(str)->ptr + RSTRING(str)->len, ptr, len);
+     RSTRING(str)->len = total;
+     RSTRING(str)->ptr[total] = '\0'; /* sentinel */
diff --git a/ruby.spec b/ruby.spec
index 656c16b..77dc6a2 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -12,7 +12,7 @@
 
 Name:		ruby
 Version:	%{rubyver}%{?dotpatchlevel}
-Release:	1%{?dist}
+Release:	2%{?dist}
 License:	Ruby or GPLv2
 URL:		http://www.ruby-lang.org/
 BuildRoot:	%{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@@ -34,6 +34,7 @@ Patch21:	ruby-deprecated-sitelib-search-path.patch
 Patch22:	ruby-deprecated-search-path.patch
 Patch23:	ruby-multilib.patch
 Patch25:	ruby-1.8.6.111-gcc43.patch
+Patch26:	ruby-1.8.6.230-string-str_buf_cat.patch
 
 Summary:	An interpreter of object-oriented scripting language
 Group:		Development/Languages
@@ -152,6 +153,7 @@ pushd %{name}-%{arcver}
 %patch23 -p1
 %endif
 %patch25 -p1
+%patch26 -p1
 popd
 
 %build
@@ -502,6 +504,9 @@ rm -rf tmp-ruby-docs
 %{_datadir}/emacs/site-lisp/site-start.d/ruby-mode-init.el
 
 %changelog
+* Wed Jun 25 2008 Akira TAGOH <tagoh@redhat.com> - 1.8.6.230-2
+- Fix a segfault issue. (#452810)
+
 * Tue Jun 24 2008 Akira TAGOH <tagoh@redhat.com> - 1.8.6.230-1
 - New upstream release.
 - Security fixes. (#452295)