From patchwork Mon Apr 22 08:50:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13638039 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9C4F2C4345F for ; Mon, 22 Apr 2024 08:51:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=6oZnAaNsv8aPMKfBpr7gp7gLVi0OHzXZohWdz4/7zkk=; b=3cMwozPZR8ECnw 8JeYs/uRaNIdJV4mvIpL4ihzVm7sqN6VWweEr+ZhHHmociRciTIZr7jD/eYW3tg2/YxOtWRNHz9rt FOCO9Sk984eZz5Ga51ZPmO2BdcKt5I0o8YZ0J7sqR5G7fS9Zw52O0LIFd0rEv6cCnIoEGTG0R+vr5 HMZ0S80tGdc9jqS+h5t6zvHplJ+K/XGOr0W037rgjoI28EWwKuMGWok6Php4mTYVOmyzn+GuqLzLn cK27K4V80IPi/G7oQ1m1kaej4J9CyvfvFSPT36nAcm/LFj2FHz7QXI88d3Mu17NKYbpPzFyUuBp45 Pb9hJJFekEd3RgXZPmvw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rypOT-0000000Cl8T-2JoU; Mon, 22 Apr 2024 08:51:21 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rypNy-0000000CkpD-1FYY; Mon, 22 Apr 2024 08:50:54 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 9598460D3D; Mon, 22 Apr 2024 08:50:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 04E97C113CC; Mon, 22 Apr 2024 08:50:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713775849; bh=QWGTfmxM6u4L/G8sJRSYS9LtFcq3UHArwE9pGA7ZHH0=; h=From:To:Cc:Subject:Date:From; b=kPg88okhcpP680FfzcbKkgLPJQO9XwxBeUPZL9ss77dhZH7Z8/HIvBwAWyJJ53G+e y02GkWX6ABTqP9C+QXwFZK2Wv6hlPlbwkbnvyR2zM1GZT6x+q/GyOO9FVEG363Rkjp q+s+eR2YgHpQD+XtEMFgMUYFrEVa2GoX7SdH8SmsvWjuoGpxyaJuP9fMLZ0GAEnUvj ZlVPazAINd0nz+LNI+40C+UAUum8w4t1a7R3yo14yIT6THznFpJmshshhibrB2BrNM r0TbYJfaJus567+iUCFCfaH+br/jWyUXOzACTqzLYJmV5MW2Q1RD+gSOO5ynlovuBC +UUCRro7ivoiw== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Alexandre Ghiti , Andrew Morton , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Donald Dutile , Eric Chanudet , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Mark Rutland , Masami Hiramatsu , Michael Ellerman , Mike Rapoport , Nadav Amit , Palmer Dabbelt , Peter Zijlstra , Rick Edgecombe , Russell King , Sam Ravnborg , Song Liu , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v5 10/15] powerpc: extend execmem_params for kprobes allocations Date: Mon, 22 Apr 2024 11:50:23 +0300 Message-ID: <20240422085028.3602777-1-rppt@kernel.org> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240422_015050_638799_1B6B4107 X-CRM114-Status: GOOD ( 14.08 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: "Mike Rapoport (IBM)" powerpc overrides kprobes::alloc_insn_page() to remove writable permissions when STRICT_MODULE_RWX is on. Add definition of EXECMEM_KRPOBES to execmem_params to allow using the generic kprobes::alloc_insn_page() with the desired permissions. As powerpc uses breakpoint instructions to inject kprobes, it does not need to constrain kprobe allocations to the modules area and can use the entire vmalloc address space. Signed-off-by: Mike Rapoport (IBM) --- arch/powerpc/kernel/kprobes.c | 20 -------------------- arch/powerpc/kernel/module.c | 7 +++++++ 2 files changed, 7 insertions(+), 20 deletions(-) diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index 9fcd01bb2ce6..14c5ddec3056 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -126,26 +126,6 @@ kprobe_opcode_t *arch_adjust_kprobe_addr(unsigned long addr, unsigned long offse return (kprobe_opcode_t *)(addr + offset); } -void *alloc_insn_page(void) -{ - void *page; - - page = execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE); - if (!page) - return NULL; - - if (strict_module_rwx_enabled()) { - int err = set_memory_rox((unsigned long)page, 1); - - if (err) - goto error; - } - return page; -error: - execmem_free(page); - return NULL; -} - int arch_prepare_kprobe(struct kprobe *p) { int ret = 0; diff --git a/arch/powerpc/kernel/module.c b/arch/powerpc/kernel/module.c index ac80559015a3..2a23cf7e141b 100644 --- a/arch/powerpc/kernel/module.c +++ b/arch/powerpc/kernel/module.c @@ -94,6 +94,7 @@ static struct execmem_info execmem_info __ro_after_init; struct execmem_info __init *execmem_arch_setup(void) { + pgprot_t kprobes_prot = strict_module_rwx_enabled() ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC; pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC; unsigned long fallback_start = 0, fallback_end = 0; unsigned long start, end; @@ -132,6 +133,12 @@ struct execmem_info __init *execmem_arch_setup(void) .fallback_start = fallback_start, .fallback_end = fallback_end, }, + [EXECMEM_KPROBES] = { + .start = VMALLOC_START, + .end = VMALLOC_END, + .pgprot = kprobes_prot, + .alignment = 1, + }, [EXECMEM_MODULE_DATA] = { .start = VMALLOC_START, .end = VMALLOC_END,