On 24 February 2017 6:32:13 pm AEDT, Bhupesh Sharma wrote:
>Hi Michael,
>
>On Thu, Feb 16, 2017 at 10:19 AM, Bhupesh Sharma
>wrote:
>> Hi Michael,
>>
>> On Fri, Feb 10, 2017 at 4:41 PM, Bhupesh Sharma
>wrote:
>>> On Fri, Feb 10, 2017 at 4:31 PM, Michael Ellerman
> wrote:
Bhupesh Sharma w
Hi Michael,
On Thu, Feb 16, 2017 at 10:19 AM, Bhupesh Sharma wrote:
> Hi Michael,
>
> On Fri, Feb 10, 2017 at 4:41 PM, Bhupesh Sharma wrote:
>> On Fri, Feb 10, 2017 at 4:31 PM, Michael Ellerman
>> wrote:
>>> Bhupesh Sharma writes:
>>>
HI Michael,
On Thu, Feb 2, 2017 at 3:53 PM,
Hi Michael,
On Fri, Feb 10, 2017 at 4:41 PM, Bhupesh Sharma wrote:
> On Fri, Feb 10, 2017 at 4:31 PM, Michael Ellerman wrote:
>> Bhupesh Sharma writes:
>>
>>> HI Michael,
>>>
>>> On Thu, Feb 2, 2017 at 3:53 PM, Michael Ellerman
>>> wrote:
Bhupesh Sharma writes:
> powerpc: arch_
On Fri, Feb 10, 2017 at 4:31 PM, Michael Ellerman wrote:
> Bhupesh Sharma writes:
>
>> HI Michael,
>>
>> On Thu, Feb 2, 2017 at 3:53 PM, Michael Ellerman wrote:
>>> Bhupesh Sharma writes:
>>>
powerpc: arch_mmap_rnd() uses hard-coded values, (23-PAGE_SHIFT) for
32-bit and (30-PAGE_SHIF
Bhupesh Sharma writes:
> HI Michael,
>
> On Thu, Feb 2, 2017 at 3:53 PM, Michael Ellerman wrote:
>> Bhupesh Sharma writes:
>>
>>> powerpc: arch_mmap_rnd() uses hard-coded values, (23-PAGE_SHIFT) for
>>> 32-bit and (30-PAGE_SHIFT) for 64-bit, to generate the random offset
>>> for the mmap base a
HI Michael,
On Thu, Feb 2, 2017 at 3:53 PM, Michael Ellerman wrote:
> Bhupesh Sharma writes:
>
>> powerpc: arch_mmap_rnd() uses hard-coded values, (23-PAGE_SHIFT) for
>> 32-bit and (30-PAGE_SHIFT) for 64-bit, to generate the random offset
>> for the mmap base address.
>>
>> This value represents
Balbir Singh writes:
> On Thu, Feb 02, 2017 at 09:23:33PM +1100, Michael Ellerman wrote:
>> +config ARCH_MMAP_RND_BITS_MIN
>> +# On 64-bit up to 1G of address space (2^30)
>> +default 12 if 64BIT && PPC_256K_PAGES # 256K (2^18), = 30 - 18 = 12
>> +default 14 if 64BIT && PPC_64K_PAGE
HI Balbir,
On Thu, Feb 2, 2017 at 2:41 PM, Balbir Singh wrote:
>> @@ -100,6 +132,8 @@ config PPC
>> select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN &&
>> POWER7_CPU)
>> select HAVE_KPROBES
>> select HAVE_ARCH_KGDB
>> + select HAVE_ARCH_MMAP_RND_BITS
>> + s
Hi Kees,
On Thu, Feb 2, 2017 at 7:55 PM, Kees Cook wrote:
> On Wed, Feb 1, 2017 at 9:42 PM, Bhupesh Sharma wrote:
>> powerpc: arch_mmap_rnd() uses hard-coded values, (23-PAGE_SHIFT) for
>> 32-bit and (30-PAGE_SHIFT) for 64-bit, to generate the random offset
>> for the mmap base address.
>>
>> Th
On Wed, Feb 1, 2017 at 9:42 PM, Bhupesh Sharma wrote:
> powerpc: arch_mmap_rnd() uses hard-coded values, (23-PAGE_SHIFT) for
> 32-bit and (30-PAGE_SHIFT) for 64-bit, to generate the random offset
> for the mmap base address.
>
> This value represents a compromise between increased
> ASLR effective
On Thu, Feb 02, 2017 at 09:23:33PM +1100, Michael Ellerman wrote:
> +config ARCH_MMAP_RND_BITS_MIN
> + # On 64-bit up to 1G of address space (2^30)
> + default 12 if 64BIT && PPC_256K_PAGES # 256K (2^18), = 30 - 18 = 12
> + default 14 if 64BIT && PPC_64K_PAGES# 64K (2^16), = 30 -
Bhupesh Sharma writes:
> powerpc: arch_mmap_rnd() uses hard-coded values, (23-PAGE_SHIFT) for
> 32-bit and (30-PAGE_SHIFT) for 64-bit, to generate the random offset
> for the mmap base address.
>
> This value represents a compromise between increased
> ASLR effectiveness and avoiding address-spac
> @@ -100,6 +132,8 @@ config PPC
> select HAVE_EFFICIENT_UNALIGNED_ACCESS if !(CPU_LITTLE_ENDIAN &&
> POWER7_CPU)
> select HAVE_KPROBES
> select HAVE_ARCH_KGDB
> + select HAVE_ARCH_MMAP_RND_BITS
> + select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
COMPAT is on for ppc64 b
powerpc: arch_mmap_rnd() uses hard-coded values, (23-PAGE_SHIFT) for
32-bit and (30-PAGE_SHIFT) for 64-bit, to generate the random offset
for the mmap base address.
This value represents a compromise between increased
ASLR effectiveness and avoiding address-space fragmentation.
Replace it with a K
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