linux-kernel - Re: [PATCH v2] riscv: Add kprobes KUnit test

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Message-ID: <16b74b63-f223-4f0b-b6e5-31cea5e620b4@redhat.com>
Date: Fri, 26 Sep 2025 13:51:33 +0200
From: Thomas Huth <thuth@...hat.com>
To: Nam Cao <namcao@...utronix.de>, Paul Walmsley <paul.walmsley@...ive.com>,
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Alexandre Ghiti <alex@...ti.fr>, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] riscv: Add kprobes KUnit test

On 13/05/2025 17.16, Nam Cao wrote:
> Add KUnit test for riscv kprobes, mostly for simulated instructions. The
> test install kprobes into multiple sample functions, and check that these
> functions still return the expected magic value.
> 
> This test can detect some kprobe bugs reported in the past (in Link:).
> 
> Link: https://lore.kernel.org/linux-riscv/20241119111056.2554419-1-namcao@linutronix.de/
> Link: https://lore.kernel.org/stable/c7e463c0-8cad-4f4e-addd-195c06b7b6de@iscas.ac.cn/
> Link: https://lore.kernel.org/linux-riscv/20230829182500.61875-1-namcaov@gmail.com/
> Signed-off-by: Nam Cao <namcao@...utronix.de>
> ---
...
> diff --git a/arch/riscv/kernel/tests/kprobes/test-kprobes.h b/arch/riscv/kernel/tests/kprobes/test-kprobes.h
> new file mode 100644
> index 000000000000..3886ab491ecb
> --- /dev/null
> +++ b/arch/riscv/kernel/tests/kprobes/test-kprobes.h
> @@ -0,0 +1,24 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +#ifndef TEST_KPROBES_H
> +#define TEST_KPROBES_H
> +
> +/*
> + * The magic value that all the functions in the test_kprobes_functions array return. The test
> + * installs kprobes into these functions, and verify that the functions still correctly return this
> + * value.
> + */
> +#define KPROBE_TEST_MAGIC          0xcafebabe
> +#define KPROBE_TEST_MAGIC_LOWER    0x0000babe
> +#define KPROBE_TEST_MAGIC_UPPER    0xcafe0000
> +
> +#ifndef __ASSEMBLY__

Could you maybe change that into "__ASSEMBLER__" instead of "__ASSEMBLY__" ? 
I'm currently trying to get rid of the latter in the kernel sources, see: 
https://lore.kernel.org/all/20250606070952.498274-1-thuth@redhat.com/

> +/* array of addresses to install kprobes */
> +extern void *test_kprobes_addresses[];
> +
> +/* array of functions that return KPROBE_TEST_MAGIC */
> +extern long (*test_kprobes_functions[])(void);
> +
> +#endif /* __ASSEMBLY__ */

dito.

  Thanks,
   Thomas