diff --git a/libc/kernel/Android.mk b/libc/kernel/Android.mk
new file mode 100644
index 0000000..6ad9dab
--- /dev/null
+++ b/libc/kernel/Android.mk
@@ -0,0 +1,82 @@
+#
+# Copyright (C) 2012 The Android Open-Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+#
+# This file does the bulk of the work to auto post-process kernel headers
+# provided by the device, board, and/or product.
+#
+# The build system exposes several variables for where to find the kernel
+# headers:
+#   TARGET_DEVICE_KERNEL_HEADERS is automatically created for the current
+#       device being built. It is set as $(TARGET_DEVICE_DIR)/kernel-headers,
+#       e.g. device/samsung/tuna/kernel-headers. This directory is not
+#       explicitly set by anyone, the build system always adds this subdir.
+#
+#   TARGET_BOARD_KERNEL_HEADERS is specified by the BoardConfig.mk file
+#       to allow other directories to be included. This is useful if there's
+#       some common place where a few headers are being kept for a group
+#       of devices. For example, device/<vendor>/common/kernel-headers could
+#       contain some headers for several of <vendor>'s devices.
+#
+#   TARGET_PRODUCT_KERNEL_HEADERS is generated by the product inheritance
+#       graph. This allows architecture products to provide headers for the
+#       devices using that architecture. For example,
+#       hardware/ti/omap4xxx/omap4.mk will specify
+#       PRODUCT_VENDOR_KERNEL_HEADERS variable that specify where the omap4
+#       specific headers are, e.g. hardware/ti/omap4xxx/kernel-headers.
+#       The build system then combines all the values specified by all the
+#       PRODUCT_VENDOR_KERNEL_HEADERS directives in the product inheritance
+#       tree and then exports a TARGET_PRODUCT_KERNEL_HEADERS variable.
+#
+# The directories specified in these three variables are scanned for header
+# files (files with .h suffix), processed with the clean_header.py script,
+# and dumped under TARGET_OUT_KERNEL_HEADERS
+# (typically $OUT/obj/kernel-headers). This subdirectory is then
+# automatically added to the include path.
+#
+# The files to be generated are added as a dependency to the
+# all_copied_headers rule to make sure that they are generated before
+# any C/C++ file that may need them.
+#
+#
+
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+
+_all_kernel_header_dirs := \
+	$(TARGET_DEVICE_KERNEL_HEADERS) \
+	$(TARGET_BOARD_KERNEL_HEADERS) \
+	$(TARGET_PRODUCT_KERNEL_HEADERS)
+
+define add-kernel-header-dir
+$(eval _headers := $(patsubst $(1)/%.h,%.h,$(shell find $(1)/ -type f -name '*.h')))
+$(eval GEN := $(addprefix $(TARGET_OUT_KERNEL_HEADERS)/,$(_headers)))
+$(GEN) : PRIVATE_PATH := $(LOCAL_PATH)
+$(GEN) : PRIVATE_MODULE := kernel-headers
+$(GEN) : PRIVATE_CUSTOM_TOOL = \
+					$$(LOCAL_PATH)/tools/clean_header.py \
+						-k $(1) -d $$(TARGET_OUT_KERNEL_HEADERS) $$< > $$@
+$(GEN) : $$(LOCAL_PATH)/tools/clean_header.py
+$(GEN) : $$(TARGET_OUT_KERNEL_HEADERS)/%.h : $(1)/%.h
+	$$(transform-generated-source)
+all_copied_headers: $(GEN)
+$(eval GEN :=)
+$(eval _headers :=)
+endef
+
+$(foreach d,$(_all_kernel_header_dirs),\
+    $(eval $(call add-kernel-header-dir,$(d))))
diff --git a/linker/linker.c b/linker/linker.c
index 7463811..3a923c1 100644
--- a/linker/linker.c
+++ b/linker/linker.c
@@ -815,16 +815,15 @@
     return (unsigned)req_base;
 }
 
-/* alloc_mem_region
+/* reserve_mem_region
  *
  *     This function reserves a chunk of memory to be used for mapping in
- *     the shared library. We reserve the entire memory region here, and
+ *     a prelinked shared library. We reserve the entire memory region here, and
  *     then the rest of the linker will relocate the individual loadable
  *     segments into the correct locations within this memory range.
  *
  * Args:
- *     si->base: The requested base of the allocation. If 0, a sane one will be
- *               chosen in the range LIBBASE <= base < LIBLAST.
+ *     si->base: The requested base of the allocation.
  *     si->size: The size of the allocation.
  *
  * Returns:
@@ -834,7 +833,7 @@
 
 static int reserve_mem_region(soinfo *si)
 {
-    void *base = mmap((void *)si->base, si->size, PROT_READ | PROT_EXEC,
+    void *base = mmap((void *)si->base, si->size, PROT_NONE,
                       MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
     if (base == MAP_FAILED) {
         DL_ERR("%5d can NOT map (%sprelinked) library '%s' at 0x%08x "
@@ -852,8 +851,7 @@
     return 0;
 }
 
-static int
-alloc_mem_region(soinfo *si)
+static int alloc_mem_region(soinfo *si)
 {
     if (si->base) {
         /* Attempt to mmap a prelinked library. */
@@ -864,7 +862,7 @@
        allocator.
     */
 
-    void *base = mmap(NULL, si->size, PROT_READ | PROT_EXEC,
+    void *base = mmap(NULL, si->size, PROT_NONE,
                       MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
     if (base == MAP_FAILED) {
         DL_ERR("%5d mmap of library '%s' failed: %d (%s)\n",
@@ -1032,7 +1030,7 @@
             si->dynamic = (unsigned *)(base + phdr->p_vaddr);
         } else if (phdr->p_type == PT_GNU_RELRO) {
             if ((phdr->p_vaddr >= si->size)
-                    || ((phdr->p_vaddr + phdr->p_memsz) >= si->size)
+                    || ((phdr->p_vaddr + phdr->p_memsz) > si->size)
                     || ((base + phdr->p_vaddr + phdr->p_memsz) < base)) {
                 DL_ERR("%d invalid GNU_RELRO in '%s' "
                        "p_vaddr=0x%08x p_memsz=0x%08x", pid, si->name,
@@ -1781,7 +1779,7 @@
                 si->dynamic = (unsigned *) (si->base + phdr->p_vaddr);
             } else if (phdr->p_type == PT_GNU_RELRO) {
                 if ((phdr->p_vaddr >= si->size)
-                        || ((phdr->p_vaddr + phdr->p_memsz) >= si->size)
+                        || ((phdr->p_vaddr + phdr->p_memsz) > si->size)
                         || ((si->base + phdr->p_vaddr + phdr->p_memsz) < si->base)) {
                     DL_ERR("%d invalid GNU_RELRO in '%s' "
                            "p_vaddr=0x%08x p_memsz=0x%08x", pid, si->name,