From patchwork Fri Jun 16 08:50:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13282226 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A6C5014AAB; Fri, 16 Jun 2023 08:52:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 436DDC4339A; Fri, 16 Jun 2023 08:51:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686905527; bh=3ehPtg/wkIhd28ojF38ghyySOncCvbgritUgNc+jgzA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=URGjKWosTv5rUBGWoAB8K22n+ckY0pEN8K+Bt4BqNRZ+SgzdpFKHreY43HU1dyMrc 63qklWW1H6ICT8nAwvHWhUBFVD/O59OAxG9WnKC7G37cBbzQyL5wndhMi12b+NjTmA KzxWoXixUG1F/na3FTPbuDPpQSkcBRHUusl/huYZwNS0rNpCLSziH8G8sg9C2Gr5+V sMjxpInlVLQ2ozavBCagEh9Z3UDjWGN+DByqgzlPXrWZaDTPyD05GivzpznP9XZ9h4 lQRd/685TGI6dpS6i6K691630F1e6FUmQK1hrJ/8UhpaIZwAh+GhrqsCum/sDilGPE b7T6Nk8NGUZ9A== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Mark Rutland , Michael Ellerman , Mike Rapoport , Nadav Amit , "Naveen N. Rao" , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , Song Liu , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@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 v2 07/12] arm64, execmem: extend execmem_params for generated code definitions Date: Fri, 16 Jun 2023 11:50:33 +0300 Message-Id: <20230616085038.4121892-8-rppt@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230616085038.4121892-1-rppt@kernel.org> References: <20230616085038.4121892-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: "Mike Rapoport (IBM)" The memory allocations for kprobes on arm64 can be placed anywhere in vmalloc address space and currently this is implemented with an override of alloc_insn_page() in arm64. Extend execmem_params with a range for generated code allocations and make kprobes on arm64 use this extension rather than override alloc_insn_page(). Signed-off-by: Mike Rapoport (IBM) Acked-by: Song Liu --- arch/arm64/kernel/module.c | 9 +++++++++ arch/arm64/kernel/probes/kprobes.c | 7 ------- include/linux/execmem.h | 11 +++++++++++ mm/execmem.c | 14 +++++++++++++- 4 files changed, 33 insertions(+), 8 deletions(-) diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c index c3d999f3a3dd..52b09626bc0f 100644 --- a/arch/arm64/kernel/module.c +++ b/arch/arm64/kernel/module.c @@ -30,6 +30,13 @@ static struct execmem_params execmem_params = { .alignment = MODULE_ALIGN, }, }, + .jit = { + .text = { + .start = VMALLOC_START, + .end = VMALLOC_END, + .alignment = 1, + }, + }, }; struct execmem_params __init *execmem_arch_params(void) @@ -40,6 +47,8 @@ struct execmem_params __init *execmem_arch_params(void) execmem_params.modules.text.start = module_alloc_base; execmem_params.modules.text.end = module_alloc_end; + execmem_params.jit.text.pgprot = PAGE_KERNEL_ROX; + /* * KASAN without KASAN_VMALLOC can only deal with module * allocations being served from the reserved module region, diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c index 70b91a8c6bb3..6fccedd02b2a 100644 --- a/arch/arm64/kernel/probes/kprobes.c +++ b/arch/arm64/kernel/probes/kprobes.c @@ -129,13 +129,6 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p) return 0; } -void *alloc_insn_page(void) -{ - return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END, - GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS, - NUMA_NO_NODE, __builtin_return_address(0)); -} - /* arm kprobe: install breakpoint in text */ void __kprobes arch_arm_kprobe(struct kprobe *p) { diff --git a/include/linux/execmem.h b/include/linux/execmem.h index 2e1221310d13..dc7c9a446111 100644 --- a/include/linux/execmem.h +++ b/include/linux/execmem.h @@ -52,12 +52,23 @@ struct execmem_modules_range { struct execmem_range data; }; +/** + * struct execmem_jit_range - architecure parameters for address space + * suitable for JIT code allocations + * @text: address range for text allocations + */ +struct execmem_jit_range { + struct execmem_range text; +}; + /** * struct execmem_params - architecure parameters for code allocations * @modules: parameters for modules address space + * @jit: parameters for jit memory address space */ struct execmem_params { struct execmem_modules_range modules; + struct execmem_jit_range jit; }; /** diff --git a/mm/execmem.c b/mm/execmem.c index f7bf496ad4c3..9730ecef9a30 100644 --- a/mm/execmem.c +++ b/mm/execmem.c @@ -89,7 +89,12 @@ void execmem_free(void *ptr) void *jit_text_alloc(size_t size) { - return execmem_text_alloc(size); + unsigned long start = execmem_params.jit.text.start; + unsigned long end = execmem_params.jit.text.end; + pgprot_t pgprot = execmem_params.jit.text.pgprot; + unsigned int align = execmem_params.jit.text.alignment; + + return execmem_alloc(size, start, end, align, pgprot, 0, 0, false); } void jit_free(void *ptr) @@ -135,6 +140,13 @@ static void execmem_init_missing(struct execmem_params *p) execmem_params.modules.data.fallback_start = m->text.fallback_start; execmem_params.modules.data.fallback_end = m->text.fallback_end; } + + if (!execmem_params.jit.text.start) { + execmem_params.jit.text.start = m->text.start; + execmem_params.jit.text.end = m->text.end; + execmem_params.jit.text.alignment = m->text.alignment; + execmem_params.jit.text.pgprot = m->text.pgprot; + } } void __init execmem_init(void)