From patchwork Tue Jun 22 08:21:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Ghiti X-Patchwork-Id: 12336609 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-22.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2481CC2B9F4 for ; Tue, 22 Jun 2021 08:24:06 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id DD26660C3E for ; Tue, 22 Jun 2021 08:24:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DD26660C3E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ghiti.fr Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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:References:In-Reply-To: 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: List-Owner; bh=1VbMXi08yvFdrhXHp2ZrK6tm7RlTzwyg6OJ7pXz39xk=; b=iOnTIlYur628gC sL9CLlMhJaS3rYF1sC2QFgINqwylJyXQt0LVb6xDPZdadw+23+9EW00NVbbaqQXpfGziyHqr4OmiJ KIohLPCASthQ50gmpfRNS3r0SjZzpkRM7bL+i97Vtp7v4FmKGNWoClL5hJyyj8lM6CXB02q/2PlzU ALt0vqbj3iOcBIq0qyZctd4tUFfJnvPXNPIgl55c5pN5GDTBT9tahUFqlRsRL3KfAvyYBQ5ahuV8b IQtknQiB3rGaLQhFAPBT7XWo9su+fR2HIiU/Oisit1MQvGwL6O+pO4frVPUH3mqXsvHdJCaVVrLT8 Nab8zsEiBzjqvAbO3xAA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lvbhH-006Dle-Ij; Tue, 22 Jun 2021 08:23:51 +0000 Received: from relay9-d.mail.gandi.net ([217.70.183.199]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lvbhD-006Djy-7t for linux-riscv@lists.infradead.org; Tue, 22 Jun 2021 08:23:49 +0000 Received: (Authenticated sender: alex@ghiti.fr) by relay9-d.mail.gandi.net (Postfix) with ESMTPSA id A2544FF813; Tue, 22 Jun 2021 08:23:41 +0000 (UTC) From: Alexandre Ghiti To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Jisheng Zhang , Christoph Hellwig , Zong Li , Anup Patel , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Alexandre Ghiti Subject: [PATCH v7 2/2] riscv: Map the kernel with correct permissions the first time Date: Tue, 22 Jun 2021 10:21:34 +0200 Message-Id: <20210622082134.2404162-3-alex@ghiti.fr> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210622082134.2404162-1-alex@ghiti.fr> References: <20210622082134.2404162-1-alex@ghiti.fr> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210622_012347_628033_C35F559A X-CRM114-Status: GOOD ( 19.42 ) 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 For 64-bit kernels, we map all the kernel with write and execute permissions and afterwards remove writability from text and executability from data. For 32-bit kernels, the kernel mapping resides in the linear mapping, so we map all the linear mapping as writable and executable and afterwards we remove those properties for unused memory and kernel mapping as described above. Change this behavior to directly map the kernel with correct permissions and avoid going through the whole mapping to fix the permissions. At the same time, this fixes an issue introduced by commit 2bfc6cd81bd1 ("riscv: Move kernel mapping outside of linear mapping") as reported here https://github.com/starfive-tech/linux/issues/17. Signed-off-by: Alexandre Ghiti Reviewed-by: Anup Patel --- arch/riscv/include/asm/page.h | 13 +++- arch/riscv/include/asm/sections.h | 17 +++++ arch/riscv/include/asm/set_memory.h | 8 -- arch/riscv/kernel/setup.c | 12 +-- arch/riscv/mm/init.c | 112 ++++++++++++---------------- 5 files changed, 81 insertions(+), 81 deletions(-) diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h index a1b888f77d57..1c2010c292b3 100644 --- a/arch/riscv/include/asm/page.h +++ b/arch/riscv/include/asm/page.h @@ -87,6 +87,7 @@ extern unsigned long va_kernel_pa_offset; extern unsigned long va_kernel_xip_pa_offset; #endif extern unsigned long pfn_base; +extern uintptr_t load_sz; #define ARCH_PFN_OFFSET (pfn_base) #else #define va_pa_offset 0 @@ -99,6 +100,11 @@ extern unsigned long pfn_base; extern unsigned long kernel_virt_addr; #ifdef CONFIG_64BIT +#define is_kernel_mapping(x) \ + ((x) >= kernel_virt_addr && (x) < (kernel_virt_addr + load_sz)) +#define is_linear_mapping(x) \ + ((x) >= PAGE_OFFSET && (x) < kernel_virt_addr) + #define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + va_pa_offset)) #ifdef CONFIG_XIP_KERNEL #define kernel_mapping_pa_to_va(y) ({ \ @@ -125,10 +131,15 @@ extern unsigned long kernel_virt_addr; #endif #define __va_to_pa_nodebug(x) ({ \ unsigned long _x = x; \ - (_x < kernel_virt_addr) ? \ + is_linear_mapping(_x) ? \ linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \ }) #else +#define is_kernel_mapping(x) \ + ((x) >= kernel_virt_addr && (x) < (kernel_virt_addr + load_sz)) +#define is_linear_mapping(x) \ + ((x) >= PAGE_OFFSET) + #define __pa_to_va_nodebug(x) ((void *)((unsigned long) (x) + va_pa_offset)) #define __va_to_pa_nodebug(x) ((unsigned long)(x) - va_pa_offset) #endif diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h index 8a303fb1ee3b..32336e8a17cb 100644 --- a/arch/riscv/include/asm/sections.h +++ b/arch/riscv/include/asm/sections.h @@ -6,6 +6,7 @@ #define __ASM_SECTIONS_H #include +#include extern char _start[]; extern char _start_kernel[]; @@ -13,4 +14,20 @@ extern char __init_data_begin[], __init_data_end[]; extern char __init_text_begin[], __init_text_end[]; extern char __alt_start[], __alt_end[]; +static inline bool is_va_kernel_text(uintptr_t va) +{ + uintptr_t start = (uintptr_t)_start; + uintptr_t end = (uintptr_t)__init_data_begin; + + return va >= start && va < end; +} + +static inline bool is_va_kernel_lm_alias_text(uintptr_t va) +{ + uintptr_t start = (uintptr_t)lm_alias(_start); + uintptr_t end = (uintptr_t)lm_alias(__init_data_begin); + + return va >= start && va < end; +} + #endif /* __ASM_SECTIONS_H */ diff --git a/arch/riscv/include/asm/set_memory.h b/arch/riscv/include/asm/set_memory.h index 4f9fc54d1806..01da17e3044f 100644 --- a/arch/riscv/include/asm/set_memory.h +++ b/arch/riscv/include/asm/set_memory.h @@ -18,13 +18,11 @@ int set_memory_nx(unsigned long addr, int numpages); int set_memory_rw_nx(unsigned long addr, int numpages); int set_kernel_memory(char *start, char *end, int (*set_memory)(unsigned long start, int num_pages)); -void protect_kernel_text_data(void); #else static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; } static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; } static inline int set_memory_x(unsigned long addr, int numpages) { return 0; } static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; } -static inline void protect_kernel_text_data(void) {} static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; } static inline int set_kernel_memory(char *start, char *end, int (*set_memory)(unsigned long start, @@ -34,12 +32,6 @@ static inline int set_kernel_memory(char *start, char *end, } #endif -#if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX) -void __init protect_kernel_linear_mapping_text_rodata(void); -#else -static inline void protect_kernel_linear_mapping_text_rodata(void) {} -#endif - int set_direct_map_invalid_noflush(struct page *page); int set_direct_map_default_noflush(struct page *page); bool kernel_page_present(struct page *page); diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index 5c6d2a1fdbc7..b0c6f372a9ec 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -289,11 +289,6 @@ void __init setup_arch(char **cmdline_p) init_resources(); sbi_init(); - if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) { - protect_kernel_text_data(); - protect_kernel_linear_mapping_text_rodata(); - } - #ifdef CONFIG_KASAN kasan_init(); #endif @@ -328,11 +323,10 @@ subsys_initcall(topology_init); void free_initmem(void) { - unsigned long init_begin = (unsigned long)__init_begin; - unsigned long init_end = (unsigned long)__init_end; - if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) - set_memory_rw_nx(init_begin, (init_end - init_begin) >> PAGE_SHIFT); + set_kernel_memory(lm_alias(__init_begin), lm_alias(__init_end), + IS_ENABLED(CONFIG_64BIT) ? + set_memory_rw : set_memory_rw_nx); free_initmem_default(POISON_FREE_INITMEM); } diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index b3fd235ddbb6..12f956b3a674 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -455,6 +455,43 @@ asmlinkage void __init __copy_data(void) } #endif +#ifdef CONFIG_STRICT_KERNEL_RWX +static __init pgprot_t pgprot_from_va(uintptr_t va) +{ + if (is_va_kernel_text(va)) + return PAGE_KERNEL_READ_EXEC; + + /* + * In 64-bit kernel, the kernel mapping is outside the linear mapping so + * we must protect its linear mapping alias from being executed and + * written. + * And rodata section is marked readonly in mark_rodata_ro. + */ + if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va)) + return PAGE_KERNEL_READ; + + return PAGE_KERNEL; +} + +void mark_rodata_ro(void) +{ + set_kernel_memory(__start_rodata, _data, set_memory_ro); + if (IS_ENABLED(CONFIG_64BIT)) + set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data), + set_memory_ro); + + debug_checkwx(); +} +#else +static __init pgprot_t pgprot_from_va(uintptr_t va) +{ + if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va)) + return PAGE_KERNEL; + + return PAGE_KERNEL_EXEC; +} +#endif /* CONFIG_STRICT_KERNEL_RWX */ + /* * setup_vm() is called from head.S with MMU-off. * @@ -474,7 +511,7 @@ asmlinkage void __init __copy_data(void) #endif static uintptr_t load_pa __initdata; -static uintptr_t load_sz __initdata; +uintptr_t load_sz; #ifdef CONFIG_XIP_KERNEL #define load_pa (*((uintptr_t *)XIP_FIXUP(&load_pa))) #define load_sz (*((uintptr_t *)XIP_FIXUP(&load_sz))) @@ -486,7 +523,8 @@ static uintptr_t xiprom_sz __initdata; #define xiprom_sz (*((uintptr_t *)XIP_FIXUP(&xiprom_sz))) #define xiprom (*((uintptr_t *)XIP_FIXUP(&xiprom))) -static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size) +static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size, + __always_unused bool early) { uintptr_t va, end_va; @@ -505,7 +543,8 @@ static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size) map_size, PAGE_KERNEL); } #else -static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size) +static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size, + bool early) { uintptr_t va, end_va; @@ -513,7 +552,9 @@ static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size) for (va = kernel_virt_addr; va < end_va; va += map_size) create_pgd_mapping(pgdir, va, load_pa + (va - kernel_virt_addr), - map_size, PAGE_KERNEL_EXEC); + map_size, + early ? + PAGE_KERNEL_EXEC : pgprot_from_va(va)); } #endif @@ -590,7 +631,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa) * us to reach paging_init(). We map all memory banks later * in setup_vm_final() below. */ - create_kernel_page_table(early_pg_dir, map_size); + create_kernel_page_table(early_pg_dir, map_size, true); #ifndef __PAGETABLE_PMD_FOLDED /* Setup early PMD for DTB */ @@ -666,22 +707,6 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa) #endif } -#if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX) -void __init protect_kernel_linear_mapping_text_rodata(void) -{ - unsigned long text_start = (unsigned long)lm_alias(_start); - unsigned long init_text_start = (unsigned long)lm_alias(__init_text_begin); - unsigned long rodata_start = (unsigned long)lm_alias(__start_rodata); - unsigned long data_start = (unsigned long)lm_alias(_data); - - set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT); - set_memory_nx(text_start, (init_text_start - text_start) >> PAGE_SHIFT); - - set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); - set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); -} -#endif - static void __init setup_vm_final(void) { uintptr_t va, map_size; @@ -714,21 +739,15 @@ static void __init setup_vm_final(void) map_size = best_map_size(start, end - start); for (pa = start; pa < end; pa += map_size) { va = (uintptr_t)__va(pa); - create_pgd_mapping(swapper_pg_dir, va, pa, - map_size, -#ifdef CONFIG_64BIT - PAGE_KERNEL -#else - PAGE_KERNEL_EXEC -#endif - ); + create_pgd_mapping(swapper_pg_dir, va, pa, map_size, + pgprot_from_va(va)); } } #ifdef CONFIG_64BIT /* Map the kernel */ - create_kernel_page_table(swapper_pg_dir, PMD_SIZE); + create_kernel_page_table(swapper_pg_dir, PMD_SIZE, false); #endif /* Clear fixmap PTE and PMD mappings */ @@ -759,39 +778,6 @@ static inline void setup_vm_final(void) } #endif /* CONFIG_MMU */ -#ifdef CONFIG_STRICT_KERNEL_RWX -void __init protect_kernel_text_data(void) -{ - unsigned long text_start = (unsigned long)_start; - unsigned long init_text_start = (unsigned long)__init_text_begin; - unsigned long init_data_start = (unsigned long)__init_data_begin; - unsigned long rodata_start = (unsigned long)__start_rodata; - unsigned long data_start = (unsigned long)_data; -#if defined(CONFIG_64BIT) && defined(CONFIG_MMU) - unsigned long end_va = kernel_virt_addr + load_sz; -#else - unsigned long end_va = (unsigned long)(__va(PFN_PHYS(max_low_pfn))); -#endif - - set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT); - set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT); - set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT); - /* rodata section is marked readonly in mark_rodata_ro */ - set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); - set_memory_nx(data_start, (end_va - data_start) >> PAGE_SHIFT); -} - -void mark_rodata_ro(void) -{ - unsigned long rodata_start = (unsigned long)__start_rodata; - unsigned long data_start = (unsigned long)_data; - - set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); - - debug_checkwx(); -} -#endif - #ifdef CONFIG_KEXEC_CORE /* * reserve_crashkernel() - reserves memory for crash kernel