From: Florian Weimer <fweimer@redhat.com>
To: Deepak Gupta <debug@rivosinc.com>
Cc: Charles Mirabile <cmirabil@redhat.com>,
pjw@kernel.org, Liam.Howlett@oracle.com, a.hindborg@kernel.org,
akpm@linux-foundation.org, alex.gaynor@gmail.com,
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Subject: Re: [PATCH v19 00/27] riscv control-flow integrity for usermode
Date: Mon, 13 Oct 2025 16:30:09 +0200 [thread overview]
Message-ID: <lhujz0yoowe.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <aN6sNFBzx8NPU3Th@debug.ba.rivosinc.com> (Deepak Gupta's message of "Thu, 2 Oct 2025 09:45:40 -0700")
* Deepak Gupta:
> How will they contribute to CFI bringup without having a CFI compiled
> usersapce?
Build glibc themselves and then proceed one library at the time.
>>Another use case would be running container images with CFI on a
>>distribution kernel which supports pre-RVA23 hardware.
>
> Container image with CFI will have glibc and ld (and all other
> userspace) also compiled with shadow stack instructions in it. As soon
> as you take this container image to a pre-RVA23 hardware, you won't
> even reach vDSO. It'll break much before that, unless kernel is taking
> a trap on all sspush/sspopchk instructions in prologue/epilogue of
> functions in userspace (glibc, ld, etc)
The idea is that you can use a stock distribution kernel to run CFI
images (potentially form a different distribution or version of the
distribution).
But maybe none of this really matters. How far out is CFI-checking
hardware? Is it going to arrive much later than the RVA23 flag day
that people are suggesting?
Thanks,
Florian
prev parent reply other threads:[~2025-10-13 14:30 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-31 23:19 [PATCH v19 00/27] riscv control-flow integrity for usermode Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 01/27] mm: VM_SHADOW_STACK definition for riscv Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 02/27] dt-bindings: riscv: zicfilp and zicfiss in dt-bindings (extensions.yaml) Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 03/27] riscv: zicfiss / zicfilp enumeration Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 04/27] riscv: zicfiss / zicfilp extension csr and bit definitions Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 05/27] riscv: usercfi state for task and save/restore of CSR_SSP on trap entry/exit Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 06/27] riscv/mm : ensure PROT_WRITE leads to VM_READ | VM_WRITE Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 07/27] riscv/mm: manufacture shadow stack pte Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 08/27] riscv/mm: teach pte_mkwrite to manufacture shadow stack PTEs Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 09/27] riscv/mm: write protect and shadow stack Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 10/27] riscv/mm: Implement map_shadow_stack() syscall Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 11/27] riscv/shstk: If needed allocate a new shadow stack on clone Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 12/27] riscv: Implements arch agnostic shadow stack prctls Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 13/27] prctl: arch-agnostic prctl for indirect branch tracking Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 14/27] riscv: Implements arch agnostic indirect branch tracking prctls Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 15/27] riscv/traps: Introduce software check exception and uprobe handling Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 16/27] riscv: signal: abstract header saving for setup_sigcontext Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 17/27] riscv/signal: save and restore of shadow stack for signal Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 18/27] riscv/kernel: update __show_regs to print shadow stack register Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 19/27] riscv/ptrace: riscv cfi status and state via ptrace and in core files Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 20/27] riscv/hwprobe: zicfilp / zicfiss enumeration in hwprobe Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 21/27] riscv: kernel command line option to opt out of user cfi Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 22/27] riscv: enable kernel access to shadow stack memory via FWFT sbi call Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 23/27] arch/riscv: compile vdso with landing pad and shadow stack note Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 24/27] riscv: create a config for shadow stack and landing pad instr support Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 25/27] riscv: Documentation for landing pad / indirect branch tracking Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 26/27] riscv: Documentation for shadow stack on riscv Deepak Gupta
2025-07-31 23:19 ` [PATCH v19 27/27] kselftest/riscv: kselftest for user mode cfi Deepak Gupta
2025-08-01 1:09 ` [PATCH v19 00/27] riscv control-flow integrity for usermode Benjamin LaHaise
2025-08-06 17:15 ` patchwork-bot+linux-riscv
2025-08-07 12:28 ` Mark Brown
2025-08-08 8:23 ` Deepak Gupta
2025-08-08 11:48 ` Mark Brown
2025-08-08 17:20 ` Deepak Gupta
2025-09-24 14:36 ` Paul Walmsley
2025-09-24 18:40 ` Deepak Gupta
2025-09-25 12:30 ` Andy Chiu
2025-09-25 14:30 ` Deepak Gupta
2025-09-30 11:15 ` Florian Weimer
2025-10-01 0:13 ` Deepak Gupta
2025-09-26 19:29 ` Charles Mirabile
2025-09-26 19:52 ` Charles Mirabile
2025-09-26 20:03 ` Deepak Gupta
2025-09-26 19:57 ` Deepak Gupta
2025-09-26 20:28 ` Charles Mirabile
2025-09-26 21:07 ` Deepak Gupta
2025-09-30 9:20 ` Florian Weimer
2025-09-30 23:48 ` Deepak Gupta
2025-10-02 11:45 ` Florian Weimer
2025-10-02 16:45 ` Deepak Gupta
2025-10-13 14:30 ` Florian Weimer [this message]
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