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Re: Sparc ASAN

From: Ramana Radhakrishnan <ramrad01 at arm dot com>
To: Konstantin Serebryany <konstantin dot s dot serebryany at gmail dot com>
Cc: Andrew Pinski <pinskia at gmail dot com>, Peter Bergner <bergner at vnet dot ibm dot com>, David Miller <davem at davemloft dot net>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>, "ebotcazou at adacore dot com" <ebotcazou at adacore dot com>, "dje dot gcc at gmail dot com" <dje dot gcc at gmail dot com>, "wmi at google dot com" <wmi at google dot com>, "dvyukov at google dot com" <dvyukov at google dot com>, Alexander Potapenko <glider at google dot com>
Date: Wed, 21 Nov 2012 19:13:28 +0000
Subject: Re: Sparc ASAN
References: <20121120.145910.1967136900981966993.davem@davemloft.net> <20121120.212040.1628331571692592011.davem@davemloft.net> <CAGQ9bdxbCeG_NM61ZR5ezrU3Sv=hiQ49+drYP6J_4ndDX9bbZQ@mail.gmail.com> <20121121.102930.2253902210993990058.davem@davemloft.net> <CAGQ9bdyNQcfs3qrpgeWqPnxizq1wZTnM6E05YSX83nK1E819dw@mail.gmail.com> <1353513910.17833.153.camel@otta> <CAGQ9bdwFf6-OxPg1urFm_b4RuunvR-_1B2ehtZTaCFrudBdS9w@mail.gmail.com> <CA+=Sn1=d4SBQSKD_80mVxhaMUkOXO+Pzzze25tfbz1J3snaxhQ@mail.gmail.com> <50AD0BB6.6000009@arm.com> <CAGQ9bdxJtN0Q=Dg27EOKM+u_AekWpw+mnC2HtMtJqfXx+jPAXg@mail.gmail.com>
Reply-to: ramrad01 at arm dot com


While trying to add support for ARM (AArch32 GNU / Linux) implementation for
GCC after-hours but still keep seeing failures on my chromebook running an
ubuntu fs on a ChrOS kernel, because the shadow memory apparently overlaps
with normal memory. Has anyone else hit this while porting ?


I've heard someone complain about this recently.
glider?

Running asan on *huge* binaries in 32-bit address space is a challenge indeed.
My suggestion was to link with -pie.

No, this was just with one of the tests in the testsuite. So I'm not sure that it's that big to warrant pie.

Oh and funnily enough it worked fine from running outside the GCC testsuite harness but fails when running inside it ! I'll try and get more details out later today or tomorrow.

regards,
Ramana

--kcc

Turning off
address space randomization doesn't seem to help either.

regards,
Ramana

References:
- Re: sparc bootstrap still broken
  - From: David Miller
- Sparc ASAN (was Re: sparc bootstrap still broken)
  - From: David Miller
- Re: Sparc ASAN (was Re: sparc bootstrap still broken)
  - From: Konstantin Serebryany
- Re: Sparc ASAN
  - From: David Miller
- Re: Sparc ASAN
  - From: Konstantin Serebryany
- Re: Sparc ASAN
  - From: Peter Bergner
- Re: Sparc ASAN
  - From: Konstantin Serebryany
- Re: Sparc ASAN
  - From: Andrew Pinski
- Re: Sparc ASAN
  - From: Ramana Radhakrishnan
- Re: Sparc ASAN
  - From: Konstantin Serebryany

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