src/patches/suse-2.6.27.25/patches.suse/x86-mark_rodata_rw-2.patch

   1 From: Andres Gruenbacher <agruen@suse.de>
   2 Subject: Also mark rodata pages executable in mark_rodata_rw()
   3
   4 For review: do we also need to mark rodata pages executable in
   5 mark_rodata_rw() to fully undo mark_rodata_ro()?
   6
   7 Signed-off-by: Andres Gruenbacher <agruen@suse.de>
   8
   9 ---
  10  arch/x86/mm/init_64-xen.c |    6 ++++++
  11  arch/x86/mm/init_64.c     |    6 ++++++
  12  2 files changed, 12 insertions(+)
  13
  14 Index: b/arch/x86/mm/init_64.c
  15 ===================================================================
  16 --- a/arch/x86/mm/init_64.c
  17 +++ b/arch/x86/mm/init_64.c
  18 @@ -912,6 +912,12 @@ void mark_rodata_rw(void)
  19         printk(KERN_INFO "Write enabling the kernel read-only data: %luk\n",
  20                (end - start) >> 10);
  21         set_memory_rw_force(start, (end - start) >> PAGE_SHIFT);
  22 +
  23 +       /*
  24 +        * The rodata section should also be executable. (The kernel text
  25 +        * still is!)
  26 +        */
  27 +       set_memory_x_force(rodata_start, (end - rodata_start) >> PAGE_SHIFT);
  28  }
  29  EXPORT_SYMBOL(mark_rodata_rw);
  30  #endif