linux-kernel - Re: [PATCH v6 12/13] riscv/kprobe: Move exception related symbols to .kprobe

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Message-ID: <87tu05tsvu.fsf@all.your.base.are.belong.to.us>
Date:   Wed, 01 Feb 2023 14:30:45 +0100
From:   Björn Töpel <bjorn@...nel.org>
To:     Chen Guokai <chenguokai17@...ls.ucas.ac.cn>,
        paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, rostedt@...dmis.org, mingo@...hat.com,
        sfr@...b.auug.org.au
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        liaochang1@...wei.com
Subject: Re: [PATCH v6 12/13] riscv/kprobe: Move exception related symbols
 to .kprobe_blacklist

Chen Guokai <chenguokai17@...ls.ucas.ac.cn> writes:

> From: Liao Chang <liaochang1@...wei.com>
>
> Due to the generic exception entry and exit code is part of the critical
> path for kprobe breakpoint and uprobe syscall entry, set a kprobe on the
> assembly symbols in entry.S result in kernel stack overflow crash, hence
> it has to explicitly blacklist it, requiring a new _ASM_NOKPROBE() asm
> helper.
>
> Signed-off-by: Liao Chang <liaochang1@...wei.com>

Reviewed-by: Björn Töpel <bjorn@...nel.org>