From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 642AAC4345F for ; Fri, 26 Apr 2024 08:37:49 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=SmvyMUme; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4VQmM00T2Vz3vpC for ; Fri, 26 Apr 2024 18:37:48 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=SmvyMUme; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=2604:1380:40e1:4800::1; helo=sin.source.kernel.org; envelope-from=rppt@kernel.org; receiver=lists.ozlabs.org) Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4VQmCW434mz3vqk for ; Fri, 26 Apr 2024 18:31:19 +1000 (AEST) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 2B96FCE1BD8; Fri, 26 Apr 2024 08:31:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3D06EC32782; Fri, 26 Apr 2024 08:31:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1714120276; bh=QWGTfmxM6u4L/G8sJRSYS9LtFcq3UHArwE9pGA7ZHH0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SmvyMUmeeEFrWhUbUHKYn4DMMnLUUa1g4+adu28RzctMKycdCQJleanPBw3qpvC6e AXnB3fL3Y+frY4KjxDxYGEctRsFjDHtgJpKUgakhljuTLQyByVrPoqm8yiw/ese+Sw 3AINiEao90grvB42lX+M49xK2vOiscW+CXPmMzHjO1X9apGHPz/G5s/ugtCXfPjwN9 214UPXOSJDw2q4YRsmzMcVl4U8SiTEGKs66FQ/JJXbBMCpYr8IcUINJH7HXTRFtQYE XiSs76Z4km7d/H9zgVIB5QWLIoEWTs/cZi94+ScfkrPABGeDB46pF5CGfvdU8JqSEh +esHXQ/w0RQ+A== From: Mike Rapoport To: linux-kernel@vger.kernel.org Subject: [PATCH v6 11/16] powerpc: extend execmem_params for kprobes allocations Date: Fri, 26 Apr 2024 11:28:49 +0300 Message-ID: <20240426082854.7355-12-rppt@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240426082854.7355-1-rppt@kernel.org> References: <20240426082854.7355-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , x86@kernel.org, Sam Ravnborg , Peter Zijlstra , Catalin Marinas , Russell King , Song Liu , Donald Dutile , sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org, Nadav Amit , linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Helge Deller , Huacai Chen , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , linux-trace-kernel@vger.kernel.org, Alexandre Ghiti , Will Deacon , Heiko Carstens , Steven Rostedt , loongarch@lists.linux.dev, Thomas Gleixner , bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Thomas Bogendoerfer , linux-parisc@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, Kent Overstreet , linux-mips@vger.kernel.org, Dinh Nguyen , Luis Chamberlain , Eric Chanudet , Palmer Dabbelt , Masami Hiramatsu , linux-modules@vger.kernel.org, Andrew Morton , Rick Edgecombe , linuxppc-dev@lists.ozlabs.org, "David S. Miller" , Mike Rapoport Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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, -- 2.43.0