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mprotect patch for use by SLIM

RFC PATCH In review Kylene Jo Hall 1 participant 1 message Jul 24, 2006

Subsystems (3)
Memory management MM core Memory mapping
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Kylene Jo Hall

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RFC PATCH 1/6 mprotect patch for use by SLIM

This small patch makes mprotect available for use by SLIM for write revocation.

Signed-off-by Mimi Zohar <[email protected]>
Signed-off-by Kylene Hall <[email protected]>
---
 include/linux/mm.h |    2 ++
 mm/mprotect.c      |   14 ++++++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)
mm/mprotect.c +12 -2
Index: linux-2.6.17/mm/mprotect.c
===================================================================
@@ -19,6 +19,7 @@
 #include <linux/mempolicy.h>
 #include <linux/personality.h>
 #include <linux/syscalls.h>
+#include <linux/module.h>
 #include <linux/swap.h>
 #include <linux/swapops.h>
 #include <asm/uaccess.h>

@@ -179,8 +180,7 @@ fail:
 	return error;
 }
 
-asmlinkage long
-sys_mprotect(unsigned long start, size_t len, unsigned long prot)
+int do_mprotect(unsigned long start, size_t len, unsigned long prot)
 {
 	unsigned long vm_flags, nstart, end, tmp, reqprot;
 	struct vm_area_struct *vma, *prev;

@@ -278,3 +278,13 @@ out:
 	up_write(&current->mm->mmap_sem);
 	return error;
 }
+EXPORT_SYMBOL_GPL(do_mprotect);
+
+asmlinkage long
+sys_mprotect(unsigned long start, size_t len, unsigned long prot)
+{
+	int ret;
+
+	ret = do_mprotect(start, len, prot);
+	return ret;
+}
include/linux/mm.h +2 -0
Index: linux-2.6.17/include/linux/mm.h
===================================================================
@@ -138,6 +138,8 @@ extern unsigned int kobjsize(const void 
 #define VM_EXEC		0x00000004
 #define VM_SHARED	0x00000008
 
+extern int do_mprotect(unsigned long start, size_t len, unsigned long prot);
+
 /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
 #define VM_MAYREAD	0x00000010	/* limits for mprotect() etc */
 #define VM_MAYWRITE	0x00000020