Re: [PATCH v12 23/28] riscv: kernel command line option to opt out of user cfi

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To: "Deepak Gupta" <debug@xxxxxxxxxxxx>
Subject: Re: [PATCH v12 23/28] riscv: kernel command line option to opt out of user cfi
From: Radim Krčmář <rkrcmar@xxxxxxxxxxxxxxxx>
Date: Fri, 21 Mar 2025 08:31:43 +0100
Cc: "Thomas Gleixner" <tglx@xxxxxxxxxxxxx>, "Ingo Molnar" <mingo@xxxxxxxxxx>, "Borislav Petkov" <bp@xxxxxxxxx>, "Dave Hansen" <dave.hansen@xxxxxxxxxxxxxxx>, <x86@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx>, "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>, "Vlastimil Babka" <vbabka@xxxxxxx>, "Lorenzo Stoakes" <lorenzo.stoakes@xxxxxxxxxx>, "Paul Walmsley" <paul.walmsley@xxxxxxxxxx>, "Palmer Dabbelt" <palmer@xxxxxxxxxxx>, "Albert Ou" <aou@xxxxxxxxxxxxxxxxx>, "Conor Dooley" <conor@xxxxxxxxxx>, "Rob Herring" <robh@xxxxxxxxxx>, "Krzysztof Kozlowski" <krzk+dt@xxxxxxxxxx>, "Arnd Bergmann" <arnd@xxxxxxxx>, "Christian Brauner" <brauner@xxxxxxxxxx>, "Peter Zijlstra" <peterz@xxxxxxxxxxxxx>, "Oleg Nesterov" <oleg@xxxxxxxxxx>, "Eric Biederman" <ebiederm@xxxxxxxxxxxx>, "Kees Cook" <kees@xxxxxxxxxx>, "Jonathan Corbet" <corbet@xxxxxxx>, "Shuah Khan" <shuah@xxxxxxxxxx>, "Jann Horn" <jannh@xxxxxxxxxx>, "Conor Dooley" <conor+dt@xxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, <linux-fsdevel@xxxxxxxxxxxxxxx>, <linux-mm@xxxxxxxxx>, <linux-riscv@xxxxxxxxxxxxxxxxxxx>, <devicetree@xxxxxxxxxxxxxxx>, <linux-arch@xxxxxxxxxxxxxxx>, <linux-doc@xxxxxxxxxxxxxxx>, <linux-kselftest@xxxxxxxxxxxxxxx>, <alistair.francis@xxxxxxx>, <richard.henderson@xxxxxxxxxx>, <jim.shu@xxxxxxxxxx>, <andybnac@xxxxxxxxx>, <kito.cheng@xxxxxxxxxx>, <charlie@xxxxxxxxxxxx>, <atishp@xxxxxxxxxxxx>, <evan@xxxxxxxxxxxx>, <cleger@xxxxxxxxxxxx>, <alexghiti@xxxxxxxxxxxx>, <samitolvanen@xxxxxxxxxx>, <broonie@xxxxxxxxxx>, <rick.p.edgecombe@xxxxxxxxx>, "linux-riscv" <linux-riscv-bounces@xxxxxxxxxxxxxxxxxxx>
In-reply-to: <CAKC1njQR9yARvWffjznjpeZK5zLFpg0-qCUo25_8niH29YL6uA@mail.gmail.com>
References: <20250314-v5_user_cfi_series-v12-0-e51202b53138@rivosinc.com> <20250314-v5_user_cfi_series-v12-23-e51202b53138@rivosinc.com> <D8LF0RDZ6809.1I3MCCVSHRSQ2@ventanamicro.com> <CAKC1njQR9yARvWffjznjpeZK5zLFpg0-qCUo25_8niH29YL6uA@mail.gmail.com>

2025-03-20T15:31:09-07:00, Deepak Gupta <debug@xxxxxxxxxxxx>:
> On Thu, Mar 20, 2025 at 2:35 PM Radim Krčmář <rkrcmar@xxxxxxxxxxxxxxxx> wrote:
>> 2025-03-14T14:39:42-07:00, Deepak Gupta <debug@xxxxxxxxxxxx>:
>> > +__setup("disable_riscv_usercfi=", setup_global_riscv_enable);
>>
>> I'd prefer two command line options instead.
>
> One for zicfilp and one for zicfiss ?

Yes.  I don't want to suggest the naming, because I would have used
"nousercfi" without an argument for the current one.

References:
- [PATCH v12 00/28] riscv control-flow integrity for usermode
  - From: Deepak Gupta
- [PATCH v12 23/28] riscv: kernel command line option to opt out of user cfi
  - From: Deepak Gupta
- Re: [PATCH v12 23/28] riscv: kernel command line option to opt out of user cfi
  - From: Radim Krčmář
- Re: [PATCH v12 23/28] riscv: kernel command line option to opt out of user cfi
  - From: Deepak Gupta

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