1. 04 May, 2016 1 commit
    • Kees Cook's avatar
      arm: factor out mmap ASLR into mmap_rnd · a7c8c37b
      Kees Cook authored
      commit fbbc400f upstream.
      
      To address the "offset2lib" ASLR weakness[1], this separates ET_DYN ASLR
      from mmap ASLR, as already done on s390.  The architectures that are
      already randomizing mmap (arm, arm64, mips, powerpc, s390, and x86), have
      their various forms of arch_mmap_rnd() made available via the new
      CONFIG_ARCH_HAS_ELF_RANDOMIZE.  For these architectures,
      arch_randomize_brk() is collapsed as well.
      
      This is an alternative to the solutions in:
      https://lkml.org/lkml/2015/2/23/442
      
      I've been able to test x86 and arm, and the buildbot (so far) seems happy
      with building the rest.
      
      [1] http://cybersecurity.upv.es/attacks/offset2lib/offset2lib.html
      
      This patch (of 10):
      
      In preparation for splitting out ET_DYN ASLR, this moves the ASLR
      calculations for mmap on ARM into a separate routine, similar to x86.
      This also removes the redundant check of personality (PF_RANDOMIZE is
      already set before calling arch_pick_mmap_layout).
      Signed-off-by: default avatarKees Cook <keescook@chromium.org>
      Cc: Hector Marco-Gisbert <hecmargi@upv.es>
      Cc: Russell King <linux@arm.linux.org.uk>
      Reviewed-by: default avatarIngo Molnar <mingo@kernel.org>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Michael Ellerman <mpe@ellerman.id.au>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: "David A. Long" <dave.long@linaro.org>
      Cc: Andrey Ryabinin <a.ryabinin@samsung.com>
      Cc: Arun Chandran <achandran@mvista.com>
      Cc: Yann Droneaud <ydroneaud@opteya.com>
      Cc: Min-Hua Chen <orca.chen@gmail.com>
      Cc: Paul Burton <paul.burton@imgtec.com>
      Cc: Alex Smith <alex@alex-smith.me.uk>
      Cc: Markos Chandras <markos.chandras@imgtec.com>
      Cc: Vineeth Vijayan <vvijayan@mvista.com>
      Cc: Jeff Bailey <jeffbailey@google.com>
      Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
      Cc: Ben Hutchings <ben@decadent.org.uk>
      Cc: Behan Webster <behanw@converseincode.com>
      Cc: Ismael Ripoll <iripoll@upv.es>
      Cc: Jan-Simon Mller <dl9pf@gmx.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarKamal Mostafa <kamal@canonical.com>
      a7c8c37b
  2. 03 May, 2016 2 commits
  3. 02 May, 2016 1 commit
  4. 29 Apr, 2016 1 commit
  5. 26 Apr, 2016 35 commits