linux-kernel - RE: x86/kprobes: kretprobe fails to triggered if kprobe at function entry is not optimized (trigger by int3 breakpoint)

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Message-ID: <d3027772a6834f89a1ddc07c0fefaa0a@trendmicro.com>
Date:   Wed, 26 Aug 2020 07:07:09 +0000
From:   "Eddy_Wu@...ndmicro.com" <Eddy_Wu@...ndmicro.com>
To:     "peterz@...radead.org" <peterz@...radead.org>
CC:     Masami Hiramatsu <mhiramat@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: RE: x86/kprobes: kretprobe fails to triggered if kprobe at function
 entry is not optimized (trigger by int3 breakpoint)

> -----Original Message-----
> From: peterz@...radead.org <peterz@...radead.org>
> Sent: Tuesday, August 25, 2020 8:09 PM
> To: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: Eddy Wu (RD-TW) <Eddy_Wu@...ndmicro.com>; linux-kernel@...r.kernel.org; x86@...nel.org; David S. Miller
> <davem@...emloft.net>
> Subject: Re: x86/kprobes: kretprobe fails to triggered if kprobe at function entry is not optimized (trigger by int3 breakpoint)
>
> Surely we can do a lockless list for this. We have llist_add() and
> llist_del_first() to make a lockless LIFO/stack.
>

llist operations require atomic cmpxchg, for some arch doesn't have CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG, in_nmi() check might still needed.
(HAVE_KRETPROBES && !CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG): arc, arm, csky, mips

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