linux-hardening - Re: [PATCH 1/3] selftests/exec: Build both static and non-static load

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Message-ID: <a1e8ab86-64e1-4cf1-bd2f-145b4c173e6d@collabora.com>
Date: Wed, 7 Aug 2024 15:22:18 +0500
From: Muhammad Usama Anjum <Usama.Anjum@...labora.com>
To: Kees Cook <keescook@...omium.org>, John Hubbard <jhubbard@...dia.com>
Cc: Usama.Anjum@...labora.com, "H . J . Lu" <hjl.tools@...il.com>,
 Chris Kennelly <ckennelly@...gle.com>, Eric Biederman
 <ebiederm@...ssion.com>, Shuah Khan <shuah@...nel.org>,
 Fangrui Song <maskray@...gle.com>, Andrew Morton
 <akpm@...ux-foundation.org>, Yang Yingliang <yangyingliang@...wei.com>,
 linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
 Mike Rapoport <rppt@...nel.org>, Rui Salvaterra <rsalvaterra@...il.com>,
 Victor Stinner <vstinner@...hat.com>, Jan Palus <jpalus@...tmail.com>,
 Al Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>,
 Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 1/3] selftests/exec: Build both static and non-static
 load_address tests

On 5/9/24 11:16 AM, Kees Cook wrote:
> On Wed, May 08, 2024 at 07:54:13PM -0700, John Hubbard wrote:
>> Didn't we learn recently, though, that -static-pie is gcc 8.1+, while the
>> kernel's minimum gcc version is 5?
> 
> Yes, that's true. If we encounter anyone trying to build the selftests
> with <8.1 I think we'll have to add a compiler version test in the
> Makefile to exclude the static pie tests.
> 
> There's also the potential issue with arm64 builds that caused the
> original attempt at -static. We'll likely need an exclusion there too.
> 
I'm not getting failures for arm64 instead for arm. I'm trying to find
this "rcrt1.o" file. Does anybody have any idea if this error can be
resolved by missing file or is it something arm-linux-gnueabihf
toolchain doesn't support?

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
arm-linux-gnueabihf-gcc -Wall -Wno-nonnull -D_GNU_SOURCE=
-Wl,-z,max-page-size=0x1000 \
        -fPIE -static-pie load_address.c -o
/home/usama/repos/kernel/linux_mainline/tools/testing/selftests/exec/load_address.static.0x1000
/usr/lib/gcc-cross/arm-linux-gnueabihf/12/../../../../arm-linux-gnueabihf/bin/ld:
cannot find rcrt1.o: No such file or directory
collect2: error: ld returned 1 exit status
make: *** [Makefile:39:
/home/usama/repos/kernel/linux_mainline/tools/testing/selftests/exec/load_address.static.0x1000]
Error 1

-- 
BR,
Muhammad Usama Anjum