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arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714925291; cv=none; b=LkEpOXu7o4EbmxaHb1oZ0yiXsYSi5QGrapkYexW+wpxcE1XJ7C5ieWzM9qzsEWw3Z9Ny9I7tW7sQJoE0bJMddmjE8X1NCJ0GltZ7A0ikWIOKCcRmE+Z6UO1fipK2Cqp1IC/lT7xUBBZ8JfSqYImtRZfA5VC+aAjrqBuU/rPIQOY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714925291; c=relaxed/simple; bh=H1Yrs9oS3D7w/IH5Du6/u6WvPsm3z4WLJALiS8Y8DQ8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IR5Rz7DcPOLuI8HHyMotvMjoZy9aHAjQGCwy5KghKgDiDv9o+O8KM6qoytNpxhCnJTDBuxVz83DWZwmdZT40NEwoUlbmZW8TPNwsyEZb0Npqi7m+hwFNgpsJrg0ben2RMsfrmQdGDCEvML+fDj+Je+FpO8WBxjPCUdo07ftOFM8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qy7fbZ3s; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id B6E61C4DDE3; Sun, 5 May 2024 16:07:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1714925291; bh=H1Yrs9oS3D7w/IH5Du6/u6WvPsm3z4WLJALiS8Y8DQ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qy7fbZ3sR5SpWYo9BfaPnLREtW6tcVlwYjkUThI241bz+XFpPVmWviyMy6XqTm6aQ dORU/UekgwSj27ajsbinG1OwPjL9K+SIsvs4fsUK8b3eFCh2fUpSfqvbtanznko+qy 73Ro0XMWqbMJ9rPGK0W5cArd1g69QQW/8ZPzU5+NVnxrXnjRYbEu6WUmAwrx5eqBvc LJWmIu7MXQJ2RAZ1BmHzdr7cHlO+FJ89P3S6tCmUfcCvgysRPuyItr44uH0fIMQcJK zfjzHgHS0WwDn5Hh0Muj2jWVN1o261zIWg73Iv07eey1MVZIFFfYZnZF8PJhFxxWCc vezWRt98tYJRw== 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 , Liviu Dudau , Luis Chamberlain , Mark Rutland , Masami Hiramatsu , Michael Ellerman , Mike Rapoport , Nadav Amit , Palmer Dabbelt , Peter Zijlstra , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= , 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 RESEND v8 07/16] mm/execmem, arch: convert simple overrides of module_alloc to execmem Date: Sun, 5 May 2024 19:06:19 +0300 Message-ID: <20240505160628.2323363-8-rppt@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240505160628.2323363-1-rppt@kernel.org> References: <20240505160628.2323363-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: sparclinux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: "Mike Rapoport (IBM)" Several architectures override module_alloc() only to define address range for code allocations different than VMALLOC address space. Provide a generic implementation in execmem that uses the parameters for address space ranges, required alignment and page protections provided by architectures. The architectures must fill execmem_info structure and implement execmem_arch_setup() that returns a pointer to that structure. This way the execmem initialization won't be called from every architecture, but rather from a central place, namely a core_initcall() in execmem. The execmem provides execmem_alloc() API that wraps __vmalloc_node_range() with the parameters defined by the architectures. If an architecture does not implement execmem_arch_setup(), execmem_alloc() will fall back to module_alloc(). Signed-off-by: Mike Rapoport (IBM) Acked-by: Song Liu Reviewed-by: Masami Hiramatsu (Google) --- arch/loongarch/kernel/module.c | 19 ++++++++-- arch/mips/kernel/module.c | 20 ++++++++-- arch/nios2/kernel/module.c | 21 ++++++++--- arch/parisc/kernel/module.c | 24 ++++++++---- arch/riscv/kernel/module.c | 24 ++++++++---- arch/sparc/kernel/module.c | 20 ++++++++-- include/linux/execmem.h | 47 ++++++++++++++++++++++++ mm/execmem.c | 67 ++++++++++++++++++++++++++++++++-- mm/mm_init.c | 2 + 9 files changed, 210 insertions(+), 34 deletions(-) diff --git a/arch/loongarch/kernel/module.c b/arch/loongarch/kernel/module.c index c7d0338d12c1..ca6dd7ea1610 100644 --- a/arch/loongarch/kernel/module.c +++ b/arch/loongarch/kernel/module.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -490,10 +491,22 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, return 0; } -void *module_alloc(unsigned long size) +static struct execmem_info execmem_info __ro_after_init; + +struct execmem_info __init *execmem_arch_setup(void) { - return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, - GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE, __builtin_return_address(0)); + execmem_info = (struct execmem_info){ + .ranges = { + [EXECMEM_DEFAULT] = { + .start = MODULES_VADDR, + .end = MODULES_END, + .pgprot = PAGE_KERNEL, + .alignment = 1, + }, + }, + }; + + return &execmem_info; } static void module_init_ftrace_plt(const Elf_Ehdr *hdr, diff --git a/arch/mips/kernel/module.c b/arch/mips/kernel/module.c index 9a6c96014904..59225a3cf918 100644 --- a/arch/mips/kernel/module.c +++ b/arch/mips/kernel/module.c @@ -20,6 +20,7 @@ #include #include #include +#include #include struct mips_hi16 { @@ -32,11 +33,22 @@ static LIST_HEAD(dbe_list); static DEFINE_SPINLOCK(dbe_lock); #ifdef MODULES_VADDR -void *module_alloc(unsigned long size) +static struct execmem_info execmem_info __ro_after_init; + +struct execmem_info __init *execmem_arch_setup(void) { - return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, - GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE, - __builtin_return_address(0)); + execmem_info = (struct execmem_info){ + .ranges = { + [EXECMEM_DEFAULT] = { + .start = MODULES_VADDR, + .end = MODULES_END, + .pgprot = PAGE_KERNEL, + .alignment = 1, + }, + }, + }; + + return &execmem_info; } #endif diff --git a/arch/nios2/kernel/module.c b/arch/nios2/kernel/module.c index 9c97b7513853..0d1ee86631fc 100644 --- a/arch/nios2/kernel/module.c +++ b/arch/nios2/kernel/module.c @@ -18,15 +18,26 @@ #include #include #include +#include #include -void *module_alloc(unsigned long size) +static struct execmem_info execmem_info __ro_after_init; + +struct execmem_info __init *execmem_arch_setup(void) { - return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, - GFP_KERNEL, PAGE_KERNEL_EXEC, - VM_FLUSH_RESET_PERMS, NUMA_NO_NODE, - __builtin_return_address(0)); + execmem_info = (struct execmem_info){ + .ranges = { + [EXECMEM_DEFAULT] = { + .start = MODULES_VADDR, + .end = MODULES_END, + .pgprot = PAGE_KERNEL_EXEC, + .alignment = 1, + }, + }, + }; + + return &execmem_info; } int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, diff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c index d214bbe3c2af..bdfa85e10c1b 100644 --- a/arch/parisc/kernel/module.c +++ b/arch/parisc/kernel/module.c @@ -49,6 +49,7 @@ #include #include #include +#include #include #include @@ -173,15 +174,22 @@ static inline int reassemble_22(int as22) ((as22 & 0x0003ff) << 3)); } -void *module_alloc(unsigned long size) +static struct execmem_info execmem_info __ro_after_init; + +struct execmem_info __init *execmem_arch_setup(void) { - /* using RWX means less protection for modules, but it's - * easier than trying to map the text, data, init_text and - * init_data correctly */ - return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, - GFP_KERNEL, - PAGE_KERNEL_RWX, 0, NUMA_NO_NODE, - __builtin_return_address(0)); + execmem_info = (struct execmem_info){ + .ranges = { + [EXECMEM_DEFAULT] = { + .start = VMALLOC_START, + .end = VMALLOC_END, + .pgprot = PAGE_KERNEL_RWX, + .alignment = 1, + }, + }, + }; + + return &execmem_info; } #ifndef CONFIG_64BIT diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c index 5e5a82644451..182904127ba0 100644 --- a/arch/riscv/kernel/module.c +++ b/arch/riscv/kernel/module.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -906,13 +907,22 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, } #if defined(CONFIG_MMU) && defined(CONFIG_64BIT) -void *module_alloc(unsigned long size) -{ - return __vmalloc_node_range(size, 1, MODULES_VADDR, - MODULES_END, GFP_KERNEL, - PAGE_KERNEL, VM_FLUSH_RESET_PERMS, - NUMA_NO_NODE, - __builtin_return_address(0)); +static struct execmem_info execmem_info __ro_after_init; + +struct execmem_info __init *execmem_arch_setup(void) +{ + execmem_info = (struct execmem_info){ + .ranges = { + [EXECMEM_DEFAULT] = { + .start = MODULES_VADDR, + .end = MODULES_END, + .pgprot = PAGE_KERNEL, + .alignment = 1, + }, + }, + }; + + return &execmem_info; } #endif diff --git a/arch/sparc/kernel/module.c b/arch/sparc/kernel/module.c index d37adb2a0b54..8b7ee45defc3 100644 --- a/arch/sparc/kernel/module.c +++ b/arch/sparc/kernel/module.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -21,11 +22,22 @@ #include "entry.h" -void *module_alloc(unsigned long size) +static struct execmem_info execmem_info __ro_after_init; + +struct execmem_info __init *execmem_arch_setup(void) { - return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, - GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE, - __builtin_return_address(0)); + execmem_info = (struct execmem_info){ + .ranges = { + [EXECMEM_DEFAULT] = { + .start = MODULES_VADDR, + .end = MODULES_END, + .pgprot = PAGE_KERNEL, + .alignment = 1, + }, + }, + }; + + return &execmem_info; } /* Make generic code ignore STT_REGISTER dummy undefined symbols. */ diff --git a/include/linux/execmem.h b/include/linux/execmem.h index 8eebc8ef66e7..96fc59258467 100644 --- a/include/linux/execmem.h +++ b/include/linux/execmem.h @@ -33,6 +33,47 @@ enum execmem_type { EXECMEM_TYPE_MAX, }; +/** + * struct execmem_range - definition of an address space suitable for code and + * related data allocations + * @start: address space start + * @end: address space end (inclusive) + * @pgprot: permissions for memory in this address space + * @alignment: alignment required for text allocations + */ +struct execmem_range { + unsigned long start; + unsigned long end; + pgprot_t pgprot; + unsigned int alignment; +}; + +/** + * struct execmem_info - architecture parameters for code allocations + * @ranges: array of parameter sets defining architecture specific + * parameters for executable memory allocations. The ranges that are not + * explicitly initialized by an architecture use parameters defined for + * @EXECMEM_DEFAULT. + */ +struct execmem_info { + struct execmem_range ranges[EXECMEM_TYPE_MAX]; +}; + +/** + * execmem_arch_setup - define parameters for allocations of executable memory + * + * A hook for architectures to define parameters for allocations of + * executable memory. These parameters should be filled into the + * @execmem_info structure. + * + * For architectures that do not implement this method a default set of + * parameters will be used + * + * Return: a structure defining architecture parameters and restrictions + * for allocations of executable memory + */ +struct execmem_info *execmem_arch_setup(void); + /** * execmem_alloc - allocate executable memory * @type: type of the allocation @@ -54,4 +95,10 @@ void *execmem_alloc(enum execmem_type type, size_t size); */ void execmem_free(void *ptr); +#ifdef CONFIG_EXECMEM +void execmem_init(void); +#else +static inline void execmem_init(void) {} +#endif + #endif /* _LINUX_EXECMEM_ALLOC_H */ diff --git a/mm/execmem.c b/mm/execmem.c index 480adc69b20d..80e61c1e7319 100644 --- a/mm/execmem.c +++ b/mm/execmem.c @@ -11,14 +11,30 @@ #include #include -static void *__execmem_alloc(size_t size) +static struct execmem_info *execmem_info __ro_after_init; + +static void *__execmem_alloc(struct execmem_range *range, size_t size) { - return module_alloc(size); + unsigned long start = range->start; + unsigned long end = range->end; + unsigned int align = range->alignment; + pgprot_t pgprot = range->pgprot; + + return __vmalloc_node_range(size, align, start, end, + GFP_KERNEL, pgprot, VM_FLUSH_RESET_PERMS, + NUMA_NO_NODE, __builtin_return_address(0)); } void *execmem_alloc(enum execmem_type type, size_t size) { - return __execmem_alloc(size); + struct execmem_range *range; + + if (!execmem_info) + return module_alloc(size); + + range = &execmem_info->ranges[type]; + + return __execmem_alloc(range, size); } void execmem_free(void *ptr) @@ -30,3 +46,48 @@ void execmem_free(void *ptr) WARN_ON(in_interrupt()); vfree(ptr); } + +static bool execmem_validate(struct execmem_info *info) +{ + struct execmem_range *r = &info->ranges[EXECMEM_DEFAULT]; + + if (!r->alignment || !r->start || !r->end || !pgprot_val(r->pgprot)) { + pr_crit("Invalid parameters for execmem allocator, module loading will fail"); + return false; + } + + return true; +} + +static void execmem_init_missing(struct execmem_info *info) +{ + struct execmem_range *default_range = &info->ranges[EXECMEM_DEFAULT]; + + for (int i = EXECMEM_DEFAULT + 1; i < EXECMEM_TYPE_MAX; i++) { + struct execmem_range *r = &info->ranges[i]; + + if (!r->start) { + r->pgprot = default_range->pgprot; + r->alignment = default_range->alignment; + r->start = default_range->start; + r->end = default_range->end; + } + } +} + +struct execmem_info * __weak execmem_arch_setup(void) +{ + return NULL; +} + +void __init execmem_init(void) +{ + struct execmem_info *info = execmem_arch_setup(); + + if (!info || !execmem_validate(info)) + return; + + execmem_init_missing(info); + + execmem_info = info; +} diff --git a/mm/mm_init.c b/mm/mm_init.c index 549e76af8f82..b6a1fcf6e13a 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -27,6 +27,7 @@ #include #include #include +#include #include "internal.h" #include "slab.h" #include "shuffle.h" @@ -2793,4 +2794,5 @@ void __init mm_core_init(void) pti_init(); kmsan_init_runtime(); mm_cache_init(); + execmem_init(); }