Merge #18522: glibc: enable stackprotection hardening

pkgs/development/libraries/glibc/common.nix

@@ -82,7 +82,7 @@ stdenv.mkDerivation ({
       "--enable-add-ons"
       "--enable-obsolete-rpc"
       "--sysconfdir=/etc"
-      "libc_cv_ssp=no"
+      "--enable-stackguard-randomization"
       (if linuxHeaders != null
        then "--with-headers=${linuxHeaders}/include"
        else "--without-headers")

pkgs/development/libraries/glibc/default.nix

@@ -33,6 +33,9 @@ in
       makeFlagsArray+=("bindir=$bin/bin" "sbindir=$bin/sbin" "rootsbindir=$bin/sbin")
     '';
 
+    # The stackprotector and fortify hardening flags are autodetected by glibc
+    # and enabled by default if supported. Setting it for every gcc invocation
+    # does not work.
     hardeningDisable = [ "stackprotector" "fortify" ];
 
     # When building glibc from bootstrap-tools, we need libgcc_s at RPATH for