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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jVbNk-0003Tp-V7; Mon, 04 May 2020 13:43:40 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jVbNi-0003TG-JX for linux-arm-kernel@lists.infradead.org; Mon, 04 May 2020 13:43:39 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5B4F81FB; Mon, 4 May 2020 06:43:37 -0700 (PDT) Received: from C02TD0UTHF1T.local (unknown [10.57.4.172]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1E82D3F71F; Mon, 4 May 2020 06:43:35 -0700 (PDT) Date: Mon, 4 May 2020 14:43:33 +0100 From: Mark Rutland To: Mark Brown Subject: Re: [PATCH v4 4/4] arm64: insn: Report PAC and BTI instructions as skippable Message-ID: <20200504134333.GD73375@C02TD0UTHF1T.local> References: <20200504131326.18290-1-broonie@kernel.org> <20200504131326.18290-5-broonie@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200504131326.18290-5-broonie@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200504_064338_684224_81F0C284 X-CRM114-Status: GOOD ( 14.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, May 04, 2020 at 02:13:26PM +0100, Mark Brown wrote: > The PAC and BTI instructions can be safely skipped so report them as > such, allowing them to be probed. > > Signed-off-by: Mark Brown > Acked-by: Catalin Marinas These all look safe to step in a XOL area, so: Acked-by: Mark Rutland > --- > arch/arm64/kernel/insn.c | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c > index 15c3f0643e3b..6439af794ec4 100644 > --- a/arch/arm64/kernel/insn.c > +++ b/arch/arm64/kernel/insn.c > @@ -57,6 +57,23 @@ bool __kprobes aarch64_insn_is_steppable_hint(u32 insn) > return false; > > switch (insn & 0xFE0) { > + case AARCH64_INSN_HINT_XPACLRI: > + case AARCH64_INSN_HINT_PACIA_1716: > + case AARCH64_INSN_HINT_PACIB_1716: > + case AARCH64_INSN_HINT_AUTIA_1716: > + case AARCH64_INSN_HINT_AUTIB_1716: > + case AARCH64_INSN_HINT_PACIAZ: > + case AARCH64_INSN_HINT_PACIASP: > + case AARCH64_INSN_HINT_PACIBZ: > + case AARCH64_INSN_HINT_PACIBSP: > + case AARCH64_INSN_HINT_AUTIAZ: > + case AARCH64_INSN_HINT_AUTIASP: > + case AARCH64_INSN_HINT_AUTIBZ: > + case AARCH64_INSN_HINT_AUTIBSP: > + case AARCH64_INSN_HINT_BTI: > + case AARCH64_INSN_HINT_BTIC: > + case AARCH64_INSN_HINT_BTIJ: > + case AARCH64_INSN_HINT_BTIJC: Just to check -- do we set the GP flag when creating/mapping the XOL area? If that's PAGE_KERNEL_EXEC, presumably we do. Mark. > case AARCH64_INSN_HINT_NOP: > return true; > default: > -- > 2.20.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel