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Subject[PATCH] NOMMU: add support for Memory Protection Units (MPU)
Date
From: Bernd Schmidt <bernds_cb1@t-online.de>

Some architectures (like the Blackfin arch) implement some of the
"simpler" features that one would expect out of a MMU such as memory
protection. In our case, we actually get read/write/exec protection
down to the page boundary so processes can't stomp on each other let
alone the kernel. There is a performance decrease (which depends greatly
on the workload) however as the hardware/software interaction was not
optimized at design time.

Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: David Howells <dhowells@redhat.com>
---
kernel/module.c | 5 +++++
mm/nommu.c | 21 +++++++++++++++++++++
2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index 05ce49c..90af6a1 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -47,6 +47,7 @@
#include <linux/rculist.h>
#include <asm/uaccess.h>
#include <asm/cacheflush.h>
+#include <asm/mmu_context.h>
#include <linux/license.h>
#include <asm/sections.h>
#include <linux/tracepoint.h>
@@ -1535,6 +1536,10 @@ static void free_module(struct module *mod)

/* Finally, free the core (containing the module structure) */
module_free(mod, mod->module_core);
+
+#ifdef CONFIG_MPU
+ update_protections(current->mm);
+#endif
}

void *__symbol_get(const char *symbol)
diff --git a/mm/nommu.c b/mm/nommu.c
index 66e81e7..b73f4be 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -33,6 +33,7 @@
#include <asm/uaccess.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
+#include <asm/mmu_context.h>
#include "internal.h"

static inline __attribute__((format(printf, 1, 2)))
@@ -627,6 +628,22 @@ static void put_nommu_region(struct vm_region *region)
}

/*
+ * update protection on a vma
+ */
+static void protect_vma(struct vm_area_struct *vma, unsigned long flags)
+{
+#ifdef CONFIG_MPU
+ struct mm_struct *mm = vma->vm_mm;
+ long start = vma->vm_start & PAGE_MASK;
+ while (start < vma->vm_end) {
+ protect_page(mm, start, flags);
+ start += PAGE_SIZE;
+ }
+ update_protections(mm);
+#endif
+}
+
+/*
* add a VMA into a process's mm_struct in the appropriate place in the list
* and tree and add to the address space's page tree also if not an anonymous
* page
@@ -645,6 +662,8 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
mm->map_count++;
vma->vm_mm = mm;

+ protect_vma(vma, vma->vm_flags);
+
/* add the VMA to the mapping */
if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;
@@ -707,6 +726,8 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)

kenter("%p", vma);

+ protect_vma(vma, 0);
+
mm->map_count--;
if (mm->mmap_cache == vma)
mm->mmap_cache = NULL;
--
1.6.5.rc1


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