From: Mark Rutland <mark.rutland@arm.com>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Pratyush Anand <panand@redhat.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
James Morse <james.morse@arm.com>,
"David A . Long" <dave.long@linaro.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 2/4] arm64: kprobes: Remove unneeded RODATA check
Date: Tue, 15 Jan 2019 11:20:17 +0000 [thread overview]
Message-ID: <20190115112016.GD43491@lakrids.cambridge.arm.com> (raw)
In-Reply-To: <154753347659.31541.11277302003578292109.stgit@devbox>
On Tue, Jan 15, 2019 at 03:24:36PM +0900, Masami Hiramatsu wrote:
> Remove unneeded RODATA check from arch_prepare_kprobe().
>
> Since check_kprobe_address_safe() already ensured that
> the probe address is in kernel text, we don't need to
> check whether the address in RODATA or not. That must
> be always false.
>
> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Mark.
> ---
> arch/arm64/kernel/probes/kprobes.c | 6 ------
> 1 file changed, 6 deletions(-)
>
> diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
> index b2d4b7428ebc..1dae500d0a81 100644
> --- a/arch/arm64/kernel/probes/kprobes.c
> +++ b/arch/arm64/kernel/probes/kprobes.c
> @@ -91,8 +91,6 @@ static void __kprobes arch_simulate_insn(struct kprobe *p, struct pt_regs *regs)
> int __kprobes arch_prepare_kprobe(struct kprobe *p)
> {
> unsigned long probe_addr = (unsigned long)p->addr;
> - extern char __start_rodata[];
> - extern char __end_rodata[];
>
> if (probe_addr & 0x3)
> return -EINVAL;
> @@ -106,10 +104,6 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
> if (search_exception_tables(probe_addr))
> return -EINVAL;
>
> - if (probe_addr >= (unsigned long) __start_rodata &&
> - probe_addr <= (unsigned long) __end_rodata)
> - return -EINVAL;
> -
> /* decode instruction */
> switch (arm_kprobe_decode_insn(p->addr, &p->ainsn)) {
> case INSN_REJECTED: /* insn not supported */
>
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next prev parent reply other threads:[~2019-01-15 11:20 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-15 6:23 [PATCH v2 0/4] arm64: kprobes: Update blacklist checking on arm64 Masami Hiramatsu
2019-01-15 6:24 ` [PATCH v2 1/4] arm64: kprobes: Move extable address check into arch_prepare_kprobe() Masami Hiramatsu
2019-01-15 6:24 ` [PATCH v2 2/4] arm64: kprobes: Remove unneeded RODATA check Masami Hiramatsu
2019-01-15 11:20 ` Mark Rutland [this message]
2019-01-15 6:25 ` [PATCH v2 3/4] arm64: kprobes: Move exception_text check in blacklist Masami Hiramatsu
2019-01-21 12:08 ` James Morse
2019-01-15 6:25 ` [PATCH v2 4/4] arm64: kprobes: Use arch_populate_kprobe_blacklist() Masami Hiramatsu
2019-01-21 12:20 ` James Morse
2019-01-21 13:25 ` Masami Hiramatsu
2019-02-08 9:15 ` Will Deacon
2019-02-11 13:10 ` Masami Hiramatsu
2019-02-11 15:58 ` Will Deacon
2019-02-11 16:05 ` Marc Zyngier
2019-02-12 15:28 ` Masami Hiramatsu
2019-01-16 13:40 ` [PATCH v2 0/4] arm64: kprobes: Update blacklist checking on arm64 Will Deacon
2019-01-19 13:31 ` Masami Hiramatsu
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