diff options
| author | Matt Redfearn <matt.redfearn@imgtec.com> | 2016-11-24 17:32:45 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2017-01-03 16:34:43 +0100 |
| commit | 109c32ffd89d64dd99a775f2f50443bee38b63e9 (patch) | |
| tree | 778697e612a5b4dbbf040371171403a5c700a434 /arch/mips/Kconfig | |
| parent | d9ae4f18c0d2a4781c1338e6ca0f21a1e96cdb03 (diff) | |
MIPS: Add support for ARCH_MMAP_RND_{COMPAT_}BITS
arch_mmap_rnd() uses hard-coded limits of 16MB for the randomisation
of mmap within 32bit processes and 256MB in 64bit processes. Since v4.4
other arches support tuning this value in /proc/sys/vm/mmap_rnd_bits.
Add support for this to MIPS.
Set the minimum(default) number of bits randomisation for 32bit to 8 -
which with 4k pagesize is unchanged from the current 16MB total
randomness. The minimum(default) for 64bit is 12bits, again with 4k
pagesize this is the same as the current 256MB.
This patch is necessary for MIPS32 to pass the Android CTS tests, with
the number of random bits set to 15.
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Daniel Cashman <dcashman@android.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mips@linux-mips.org
Cc: kernel-hardening@lists.openwall.com
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14617/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Kconfig')
| -rw-r--r-- | arch/mips/Kconfig | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 9a7730219c93..6ed1a0af33e9 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -14,6 +14,8 @@ config MIPS select HAVE_PERF_EVENTS select PERF_USE_VMALLOC select HAVE_ARCH_KGDB + select HAVE_ARCH_MMAP_RND_BITS if MMU + select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK select HAVE_CBPF_JIT if !CPU_MICROMIPS @@ -3073,6 +3075,20 @@ config MMU bool default y +config ARCH_MMAP_RND_BITS_MIN + default 12 if 64BIT + default 8 + +config ARCH_MMAP_RND_BITS_MAX + default 18 if 64BIT + default 15 + +config ARCH_MMAP_RND_COMPAT_BITS_MIN + default 8 + +config ARCH_MMAP_RND_COMPAT_BITS_MAX + default 15 + config I8253 bool select CLKSRC_I8253 |