+ mm-move-randomize_et_dyn-into-elf_et_dyn_base.patch added to -mm tree

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The patch titled
     Subject: mm: move randomize_et_dyn into ELF_ET_DYN_BASE
has been added to the -mm tree.  Its filename is
     mm-move-randomize_et_dyn-into-elf_et_dyn_base.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-move-randomize_et_dyn-into-elf_et_dyn_base.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-move-randomize_et_dyn-into-elf_et_dyn_base.patch

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------------------------------------------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: mm: move randomize_et_dyn into ELF_ET_DYN_BASE

This moves s390's randomize_et_dyn base into ELF_ET_DYN_BASE, and removes
an unused arm64 extern.

Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Hector Marco-Gisbert <hecmargi@xxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: "David A. Long" <dave.long@xxxxxxxxxx>
Cc: Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx>
Cc: Arun Chandran <achandran@xxxxxxxxxx>
Cc: Yann Droneaud <ydroneaud@xxxxxxxxxx>
Cc: Min-Hua Chen <orca.chen@xxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: Alex Smith <alex@xxxxxxxxxxxxxxxx>
Cc: Markos Chandras <markos.chandras@xxxxxxxxxx>
Cc: Vineeth Vijayan <vvijayan@xxxxxxxxxx>
Cc: Jeff Bailey <jeffbailey@xxxxxxxxxx>
Cc: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Behan Webster <behanw@xxxxxxxxxxxxxxxxxx>
Cc: Ismael Ripoll <iripoll@xxxxxx>
Cc: Hector Marco-Gisbert <hecmargi@xxxxxx>
Cc: Jan-Simon Mller <dl9pf@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 arch/arm64/include/asm/elf.h |    1 -
 arch/s390/include/asm/elf.h  |    9 +++++----
 arch/s390/mm/mmap.c          |   11 -----------
 3 files changed, 5 insertions(+), 16 deletions(-)

diff -puN arch/arm64/include/asm/elf.h~mm-move-randomize_et_dyn-into-elf_et_dyn_base arch/arm64/include/asm/elf.h
--- a/arch/arm64/include/asm/elf.h~mm-move-randomize_et_dyn-into-elf_et_dyn_base
+++ a/arch/arm64/include/asm/elf.h
@@ -125,7 +125,6 @@ typedef struct user_fpsimd_state elf_fpr
  * the loader.  We need to make sure that it is out of the way of the program
  * that it will "exec", and that there is sufficient room for the brk.
  */
-extern unsigned long randomize_et_dyn(unsigned long base);
 #define ELF_ET_DYN_BASE	(2 * TASK_SIZE_64 / 3)
 
 /*
diff -puN arch/s390/include/asm/elf.h~mm-move-randomize_et_dyn-into-elf_et_dyn_base arch/s390/include/asm/elf.h
--- a/arch/s390/include/asm/elf.h~mm-move-randomize_et_dyn-into-elf_et_dyn_base
+++ a/arch/s390/include/asm/elf.h
@@ -161,10 +161,11 @@ extern unsigned int vdso_enabled;
 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
    use of this is to invoke "./ld.so someprog" to test out a new version of
    the loader.  We need to make sure that it is out of the way of the program
-   that it will "exec", and that there is sufficient room for the brk.  */
-
-extern unsigned long randomize_et_dyn(void);
-#define ELF_ET_DYN_BASE		randomize_et_dyn()
+   that it will "exec", and that there is sufficient room for the brk. 64-bit
+   tasks are aligned to 4GB. */
+#define ELF_ET_DYN_BASE (arch_mmap_rnd() + (is_32bit_task() ? \
+				(STACK_TOP / 3 * 2) : \
+				(STACK_TOP / 3 * 2) & ~((1UL << 32) - 1)))
 
 /* This yields a mask that user programs can use to figure out what
    instruction set this CPU supports. */
diff -puN arch/s390/mm/mmap.c~mm-move-randomize_et_dyn-into-elf_et_dyn_base arch/s390/mm/mmap.c
--- a/arch/s390/mm/mmap.c~mm-move-randomize_et_dyn-into-elf_et_dyn_base
+++ a/arch/s390/mm/mmap.c
@@ -179,17 +179,6 @@ arch_get_unmapped_area_topdown(struct fi
 	return addr;
 }
 
-unsigned long randomize_et_dyn(void)
-{
-	unsigned long base;
-
-	base = STACK_TOP / 3 * 2;
-	if (!is_32bit_task())
-		/* Align to 4GB */
-		base &= ~((1UL << 32) - 1);
-	return base + arch_mmap_rnd();
-}
-
 #ifndef CONFIG_64BIT
 
 /*
_

Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are

origin.patch
arm-factor-out-mmap-aslr-into-mmap_rnd.patch
mm-expose-arch_mmap_rnd-when-available.patch
mm-move-randomize_et_dyn-into-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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