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Linux 3.2.12

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This commit is contained in:
Justin M. Forbes 2012-03-20 10:47:43 -05:00
commit a5904b156a
5 changed files with 692 additions and 121 deletions
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69
SHLIB_BASE-randomization.patch Normal file
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@ -0,0 +1,69 @@
diff -uNrp kernel-3.2.fc16.orig/arch/x86/mm/mmap.c kernel-3.2.fc16.new/arch/x86/mm/mmap.c
--- kernel-3.2.fc16.orig/arch/x86/mm/mmap.c 2012-03-19 16:47:03.495169091 -0400
+++ kernel-3.2.fc16.new/arch/x86/mm/mmap.c 2012-03-19 16:50:03.574168052 -0400
@@ -106,6 +106,10 @@ static unsigned long mmap_legacy_base(vo
return TASK_UNMAPPED_BASE + mmap_rnd();
}
+#ifdef CONFIG_X86_32
+ #define SHLIB_BASE 0x00111000
+#endif
+
/*
* This function, called very early during the creation of a new
* process VM image, sets up which VM layout function to use:
@@ -126,8 +126,10 @@ void arch_pick_mmap_layout(struct mm_str
#ifdef CONFIG_X86_32
if (!(current->personality & READ_IMPLIES_EXEC)
&& !(__supported_pte_mask & _PAGE_NX)
- && mmap_is_ia32())
+ && mmap_is_ia32()) {
+ mm->shlib_base = SHLIB_BASE + mmap_rnd();
mm->get_unmapped_exec_area = arch_get_unmapped_exec_area;
+ }
#endif
mm->unmap_area = arch_unmap_area_topdown;
}
diff -uNrp kernel-3.2.fc16.orig/include/linux/mm_types.h kernel-3.2.fc16.new/include/linux/mm_types.h
--- kernel-3.2.fc16.orig/include/linux/mm_types.h 2012-03-19 16:46:47.382169153 -0400
+++ kernel-3.2.fc16.new/include/linux/mm_types.h 2012-03-19 16:50:40.738168219 -0400
@@ -300,6 +300,7 @@ struct mm_struct {
void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
#endif
unsigned long mmap_base; /* base of mmap area */
+ unsigned long shlib_base; /* base of lib map area (ASCII armour)*/
unsigned long task_size; /* size of task vm space */
unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
diff -uNrp kernel-3.2.fc16.orig/mm/mmap.c kernel-3.2.fc16.new/mm/mmap.c
--- kernel-3.2.fc16.orig/mm/mmap.c 2012-03-19 16:46:15.791169274 -0400
+++ kernel-3.2.fc16.new/mm/mmap.c 2012-03-19 16:51:37.351166875 -0400
@@ -1594,8 +1594,6 @@ static bool should_randomize(void)
!(current->personality & ADDR_NO_RANDOMIZE);
}
-#define SHLIB_BASE 0x00110000
-
unsigned long
arch_get_unmapped_exec_area(struct file *filp, unsigned long addr0,
unsigned long len0, unsigned long pgoff, unsigned long flags)
@@ -1612,8 +1610,8 @@ arch_get_unmapped_exec_area(struct file
return addr;
if (!addr)
- addr = !should_randomize() ? SHLIB_BASE :
- randomize_range(SHLIB_BASE, 0x01000000, len);
+ addr = !should_randomize() ? mm->shlib_base :
+ randomize_range(mm->shlib_base, 0x01000000, len);
if (addr) {
addr = PAGE_ALIGN(addr);
@@ -1623,7 +1621,7 @@ arch_get_unmapped_exec_area(struct file
return addr;
}
- addr = SHLIB_BASE;
+ addr = mm->shlib_base;
for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
/* At this point: (!vma || addr < vma->vm_end). */
if (TASK_SIZE - len < addr)