linux-kernel - Re: [PATCH v2 0/4] arm64: kprobes: Update blacklist checking on arm64

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Message-ID: <20190116134007.GA15255@fuggles.cambridge.arm.com>
Date:   Wed, 16 Jan 2019 13:40:07 +0000
From:   Will Deacon <will.deacon@....com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Pratyush Anand <panand@...hat.com>,
        "David A . Long" <dave.long@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        James Morse <james.morse@....com>
Subject: Re: [PATCH v2 0/4] arm64: kprobes: Update blacklist checking on arm64

Hi Masami,

On Tue, Jan 15, 2019 at 03:23:39PM +0900, Masami Hiramatsu wrote:
> Hello,
> 
> Here is the v2 series of update of the kprobe blacklist
> checking on arm64.
> 
> I found that some blacklist checking code were mis-placed in
> arch_prepare_kprobe() and arch_within_kprobe_blacklist().
> Since the blacklist just filters by symbol, smaller than the
> symbol, like extable must be checked in arch_prepare_kprobe().
> Also, all function (symbol) level check must be done by blacklist.
> 
> For arm64, it checks the extable entry address in blacklist
> and exception/irqentry function in arch_prepare_kprobe().
> And, RODATA check is unneeded since kernel/kprobes.c
> already ensures the probe address is in kernel-text area.
> 
> In v2, I updated [1/4]'s description and added James'
> Reviewed-by. Also, in this version, I added a patch which
> uses arch_populate_kprobe_blacklist() instead of
> arch_within_kprobe_blacklist() so that user can see the full
> list of blacklisted symbols under the debugfs.

Assuming these are targetting the arm64 tree, are you intending to get them
merged for 5.0?

Will