Re: [RFC PATCH v2 0/2] Randomization of address chosen by mmap.
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- To: Pavel Machek <pavel@xxxxxx>
- Subject: Re: [RFC PATCH v2 0/2] Randomization of address chosen by mmap.
- From: Rich Felker <dalias@xxxxxxxx>
- Date: Fri, 30 Mar 2018 09:33:48 -0400
- Cc: Ilya Smith <blackzert@xxxxxxxxx>, rth@xxxxxxxxxxx, ink@xxxxxxxxxxxxxxxxxxxx, mattst88@xxxxxxxxx, vgupta@xxxxxxxxxxxx, linux@xxxxxxxxxxxxxxx, tony.luck@xxxxxxxxx, fenghua.yu@xxxxxxxxx, jhogan@xxxxxxxxxx, ralf@xxxxxxxxxxxxxx, jejb@xxxxxxxxxxxxxxxx, deller@xxxxxx, benh@xxxxxxxxxxxxxxxxxxx, paulus@xxxxxxxxx, mpe@xxxxxxxxxxxxxx, schwidefsky@xxxxxxxxxx, heiko.carstens@xxxxxxxxxx, ysato@xxxxxxxxxxxxxxxxxxxx, davem@xxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, hpa@xxxxxxxxx, x86@xxxxxxxxxx, nyc@xxxxxxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx, arnd@xxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, deepa.kernel@xxxxxxxxx, mhocko@xxxxxxxx, hughd@xxxxxxxxxx, kstewart@xxxxxxxxxxxxxxxxxxx, pombredanne@xxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, steve.capper@xxxxxxx, punit.agrawal@xxxxxxx, paul.burton@xxxxxxxx, aneesh.kumar@xxxxxxxxxxxxxxxxxx, npiggin@xxxxxxxxx, keescook@xxxxxxxxxxxx, bhsharma@xxxxxxxxxx, riel@xxxxxxxxxx, nitin.m.gupta@xxxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, dan.j.williams@xxxxxxxxx, jack@xxxxxxx, ross.zwisler@xxxxxxxxxxxxxxx, jglisse@xxxxxxxxxx, willy@xxxxxxxxxxxxx, aarcange@xxxxxxxxxx, oleg@xxxxxxxxxx, linux-alpha@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-snps-arc@xxxxxxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-metag@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx
- In-reply-to: <20180330075508.GA21798@amd>
- References: <1521736598-12812-1-git-send-email-blackzert@gmail.com> <20180330075508.GA21798@amd>
- User-agent: Mutt/1.5.21 (2010-09-15)
On Fri, Mar 30, 2018 at 09:55:08AM +0200, Pavel Machek wrote:
> Hi!
>
> > Current implementation doesn't randomize address returned by mmap.
> > All the entropy ends with choosing mmap_base_addr at the process
> > creation. After that mmap build very predictable layout of address
> > space. It allows to bypass ASLR in many cases. This patch make
> > randomization of address on any mmap call.
>
> How will this interact with people debugging their application, and
> getting different behaviours based on memory layout?
>
> strace, strace again, get different results?
Normally gdb disables ASLR for the process when invoking a program to
debug. I don't see why that would be terribly useful with strace but
you can do the same if you want.
Rich
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