linux-kernel - Re: [PATCH v6 33/33] kselftest/riscv: kselftest for user mode cfi

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Message-ID: <ZwmAdRb5BRkPLbWg@debug.ba.rivosinc.com>
Date: Fri, 11 Oct 2024 12:45:57 -0700
From: Deepak Gupta <debug@...osinc.com>
To: Zong Li <zong.li@...ive.com>
Cc: Mark Brown <broonie@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Conor Dooley <conor@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Christian Brauner <brauner@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Eric Biederman <ebiederm@...ssion.com>, Kees Cook <kees@...nel.org>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
	alistair.francis@....com, richard.henderson@...aro.org,
	jim.shu@...ive.com, andybnac@...il.com, kito.cheng@...ive.com,
	charlie@...osinc.com, atishp@...osinc.com, evan@...osinc.com,
	cleger@...osinc.com, alexghiti@...osinc.com,
	samitolvanen@...gle.com, rick.p.edgecombe@...el.com
Subject: Re: [PATCH v6 33/33] kselftest/riscv: kselftest for user mode cfi

On Fri, Oct 11, 2024 at 07:43:30PM +0800, Zong Li wrote:
>On Fri, Oct 11, 2024 at 6:18 PM Mark Brown <broonie@...nel.org> wrote:
>>
>> On Fri, Oct 11, 2024 at 01:44:55PM +0800, Zong Li wrote:
>> > On Wed, Oct 9, 2024 at 7:46 AM Deepak Gupta <debug@...osinc.com> wrote:
>>
>> > > +       if (si->si_code == SEGV_CPERR) {
>>
>> > Hi Deepak,
>> > I got some errors when building this test, I suppose they should be
>> > fixed in the next version.
>>
>> > riscv_cfi_test.c: In function 'sigsegv_handler':
>> > riscv_cfi_test.c:17:28: error: 'SEGV_CPERR' undeclared (first use in
>> > this function); did you mean 'SEGV_ACCERR'?
>> >    17 |         if (si->si_code == SEGV_CPERR) {
>> >       |                            ^~~~~~~~~~
>> >       |                            SEGV_ACCERR
>> >
>>
>> Did you run "make headers_install" prior to building kselftest to get
>> the current kernel's headers available for userspace builds?
>
>Yes, I have run "make header" and "make header_install" before
>building the kselftest. This error happens when I cross compiled it,
>perhaps I can help to check if it is missing some header files or
>header search path.

That's wierd.

It doesn't fail for me even if I do not do `make headers_install`. But I am
building kernel and selftests with toolchain which supports shadow stack and
landing pad. It's defined in `siginfo.h`. When I built toolchain, I did point
it at the latest kernel headers. May be that's the trick.

"""

$ grep -nir SEGV_CPERR /scratch/debug/linux/kbuild/usr/include/*
/scratch/debug/linux/kbuild/usr/include/asm-generic/siginfo.h:240:#define SEGV_CPERR    10      /* Control protection fault */

$ grep -nir SEGV_CPERR /scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/*
/scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/include/asm-generic/siginfo.h:240:#define SEGV_CPERR    10      /* Control protection fault */
/scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/include/bits/siginfo-consts.h:139:  SEGV_CPERR                  /* Control protection fault.  */
/scratch/debug/open_src/sifive_cfi_toolchain/INSTALL_Sept18/sysroot/usr/include/bits/siginfo-consts.h:140:#  define SEGV_CPERR  SEGV_CPERR

"""