The patch titled
Subject: mips: extract logic for mmap_rnd()
has been added to the -mm tree. Its filename is
mips-extract-logic-for-mmap_rnd.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mips-extract-logic-for-mmap_rnd.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mips-extract-logic-for-mmap_rnd.patch
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------------------------------------------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: mips: extract logic for mmap_rnd()
In preparation for splitting out ET_DYN ASLR, extract the mmap ASLR
selection into a separate function.
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/mips/mm/mmap.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff -puN arch/mips/mm/mmap.c~mips-extract-logic-for-mmap_rnd arch/mips/mm/mmap.c
--- a/arch/mips/mm/mmap.c~mips-extract-logic-for-mmap_rnd
+++ a/arch/mips/mm/mmap.c
@@ -142,18 +142,26 @@ unsigned long arch_get_unmapped_area_top
addr0, len, pgoff, flags, DOWN);
}
+static unsigned long mmap_rnd(void)
+{
+ unsigned long rnd;
+
+ rnd = (unsigned long)get_random_int();
+ rnd <<= PAGE_SHIFT;
+ if (TASK_IS_32BIT_ADDR)
+ random_factor &= 0xfffffful;
+ else
+ random_factor &= 0xffffffful;
+
+ return rnd;
+}
+
void arch_pick_mmap_layout(struct mm_struct *mm)
{
unsigned long random_factor = 0UL;
- if (current->flags & PF_RANDOMIZE) {
- random_factor = get_random_int();
- random_factor = random_factor << PAGE_SHIFT;
- if (TASK_IS_32BIT_ADDR)
- random_factor &= 0xfffffful;
- else
- random_factor &= 0xffffffful;
- }
+ if (current->flags & PF_RANDOMIZE)
+ random_factor = mmap_rnd();
if (mmap_is_legacy()) {
mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
_
Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are
arm-factor-out-mmap-aslr-into-mmap_rnd.patch
x86-standardize-mmap_rnd-usage.patch
arm64-standardize-mmap_rnd-usage.patch
mips-extract-logic-for-mmap_rnd.patch
powerpc-standardize-mmap_rnd-usage.patch
s390-standardize-mmap_rnd-usage.patch
mm-expose-arch_mmap_rnd-when-available.patch
s390-redefine-randomize_et_dyn-for-elf_et_dyn_base.patch
mm-split-et_dyn-aslr-from-mmap-aslr.patch
mm-fold-arch_randomize_brk-into-arch_has_elf_randomize.patch
lib-vsprintf-add-%pt-format-specifier.patch
linux-next.patch
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