From nobody Tue Nov 26 19:47:55 2024 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 4C1FD20821C; Wed, 16 Oct 2024 12:27:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729081625; cv=none; b=s38+MPhnutUqUtm0FqgK7HuElUjrN3z/XJYpnGkenQMOPVAb+8cucCTVvG2oV34ixVp9h6FD1LdHM++3A7+PGdkwlnQjodM/5lOpcrrM4CI6tTnUVzqtsvdzpS9wNf0WYeM4DK8b7FJYVmwsLyjPAuskVBXjgULupFYEp+J04ME= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729081625; c=relaxed/simple; bh=eY6kLN8OlN+AhPSjfqE9l5XEI+8YBmb961qfGDylvwo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AsXymXiubOq2IXvnyu0Yr9ixv0wQBG5QA74AwF064eBSsVSagv3o/B/N/i8zUZN+ztAOY2SNdNuXtQO7boiCqt0izGETpatR+l3wTHFsr4fcJCOEWD2FG1khESIXBR34hzAbsR2cjO+P5BvGN3HrMhlayBnoNyIiE8OiIYp8CZw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ewgSS7JQ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ewgSS7JQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4677BC4CECF; Wed, 16 Oct 2024 12:26:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729081624; bh=eY6kLN8OlN+AhPSjfqE9l5XEI+8YBmb961qfGDylvwo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ewgSS7JQnctq7Hgrv3uuVnVef5NJ6/W1nB36pkS9n4SMtyIyVrElKtKyFF1q0jkpP EsFcTPX0SKB8iugJZ8fG/3GbaKQ9JTTxiSf0x8Je0VGHSki/f8KCPFSVhlw3IAbCgq dHZxxLb3XDQt5YWY63oWKwfSJfIRrZ4ETnxR7W4suuZEwzrS9kg5Y5qEjXIsmjEAIc d+qNLfS/dkDTekE3774d/xn4huY0MjrfXRLRM5fT0pICnGA4BMmSBqBpOwDvhxDH7h lEAtUAvDJvuqN4dGETbbq15U4XHTm20JcFbizm6eRWYoC4wDxNk9mafVHZRkNrpKww GhffryNbJ3RBQ== From: Mike Rapoport To: Andrew Morton , Luis Chamberlain Cc: Andreas Larsson , Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Borislav Petkov , Brian Cain , Catalin Marinas , Christoph Hellwig , Christophe Leroy , Dave Hansen , Dinh Nguyen , Geert Uytterhoeven , Guo Ren , Helge Deller , Huacai Chen , Ingo Molnar , Johannes Berg , John Paul Adrian Glaubitz , Kent Overstreet , "Liam R. Howlett" , Mark Rutland , Masami Hiramatsu , Matt Turner , Max Filippov , Michael Ellerman , Michal Simek , Mike Rapoport , Oleg Nesterov , Palmer Dabbelt , Peter Zijlstra , Richard Weinberger , Russell King , Song Liu , Stafford Horne , Steven Rostedt , Suren Baghdasaryan , Thomas Bogendoerfer , Thomas Gleixner , Uladzislau Rezki , Vineet Gupta , Will Deacon , bpf@vger.kernel.org, linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-trace-kernel@vger.kernel.org, linux-um@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v6 8/8] x86/module: enable ROX caches for module text on 64 bit Date: Wed, 16 Oct 2024 15:24:24 +0300 Message-ID: <20241016122424.1655560-9-rppt@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241016122424.1655560-1-rppt@kernel.org> References: <20241016122424.1655560-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: "Mike Rapoport (Microsoft)" Enable execmem's cache of PMD_SIZE'ed pages mapped as ROX for module text allocations on 64 bit. Signed-off-by: Mike Rapoport (Microsoft) Reviewed-by: Luis Chamberlain --- arch/x86/Kconfig | 1 + arch/x86/mm/init.c | 37 ++++++++++++++++++++++++++++++++++++- 2 files changed, 37 insertions(+), 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 2852fcd82cbd..ff71d18253ba 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -83,6 +83,7 @@ config X86 select ARCH_HAS_DMA_OPS if GART_IOMMU || XEN select ARCH_HAS_EARLY_DEBUG if KGDB select ARCH_HAS_ELF_RANDOMIZE + select ARCH_HAS_EXECMEM_ROX if X86_64 select ARCH_HAS_FAST_MULTIPLIER select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_GCOV_PROFILE_ALL diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index eb503f53c319..c2e4f389f47f 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -1053,18 +1053,53 @@ unsigned long arch_max_swapfile_size(void) #ifdef CONFIG_EXECMEM static struct execmem_info execmem_info __ro_after_init; =20 +#ifdef CONFIG_ARCH_HAS_EXECMEM_ROX +void execmem_fill_trapping_insns(void *ptr, size_t size, bool writeable) +{ + /* fill memory with INT3 instructions */ + if (writeable) + memset(ptr, INT3_INSN_OPCODE, size); + else + text_poke_set(ptr, INT3_INSN_OPCODE, size); +} +#endif + struct execmem_info __init *execmem_arch_setup(void) { unsigned long start, offset =3D 0; + enum execmem_range_flags flags; + pgprot_t pgprot; =20 if (kaslr_enabled()) offset =3D get_random_u32_inclusive(1, 1024) * PAGE_SIZE; =20 start =3D MODULES_VADDR + offset; =20 + if (IS_ENABLED(CONFIG_ARCH_HAS_EXECMEM_ROX)) { + pgprot =3D PAGE_KERNEL_ROX; + flags =3D EXECMEM_KASAN_SHADOW | EXECMEM_ROX_CACHE; + } else { + pgprot =3D PAGE_KERNEL; + flags =3D EXECMEM_KASAN_SHADOW; + } + execmem_info =3D (struct execmem_info){ .ranges =3D { - [EXECMEM_DEFAULT] =3D { + [EXECMEM_MODULE_TEXT] =3D { + .flags =3D flags, + .start =3D start, + .end =3D MODULES_END, + .pgprot =3D pgprot, + .alignment =3D MODULE_ALIGN, + }, + [EXECMEM_KPROBES ... EXECMEM_BPF] =3D { + .flags =3D EXECMEM_KASAN_SHADOW, + .start =3D start, + .end =3D MODULES_END, + .pgprot =3D PAGE_KERNEL, + .alignment =3D MODULE_ALIGN, + }, + [EXECMEM_MODULE_DATA] =3D { .flags =3D EXECMEM_KASAN_SHADOW, .start =3D start, .end =3D MODULES_END, --=20 2.43.0