From patchwork Fri Jun 16 08:50:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13282223 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 8B5F41FCB; Fri, 16 Jun 2023 08:51:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D8B96C433C0; Fri, 16 Jun 2023 08:51:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686905498; bh=5P3mMxIXyYNFf6ppZC87llJS/A2oA3e+rU9odOZ3rFo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GrSOa5NhtnOEdPO2emKldCxYq27NagFlOnpLOPRg/qCuHIHb8LO7S1KsNa7cBBIGu CFULz/Fso5mnFPxC3GoKTve3+GH4KOJC5ENs9MjgPe830iXGdUkhmDkBuiYS3js9hZ O2Gei2pZomobwEJ1RNRHUB/XhCGqlFQVqR6O2zwyETWqFgnQaf3J1VPH78T0wy/xey gE5JfYQAcoxcH1BlP+lcR2tXCj15xHKYZDhug7RerclAfJxxJRCcw3d33O/ei7NoF5 Ctk1dieqBSWGe40Ie9dYqN4xtYT9kr+/6eGN0a2X8Ll7piImnto7TUIvOdE162+eR2 lxUPLhTkaHJxQ== 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 04/12] mm/execmem, arch: convert remaining overrides of module_alloc to execmem Date: Fri, 16 Jun 2023 11:50:30 +0300 Message-Id: <20230616085038.4121892-5-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)" Extend execmem parameters to accommodate more complex overrides of module_alloc() by architectures. This includes specification of a fallback range required by arm, arm64 and powerpc and support for allocation of KASAN shadow required by arm64, s390 and x86. The core implementation of execmem_alloc() takes care of suppressing warnings when the initial allocation fails but there is a fallback range defined. Signed-off-by: Mike Rapoport (IBM) --- arch/arm/kernel/module.c | 36 ++++++++++--------- arch/arm64/kernel/module.c | 68 ++++++++++++++++-------------------- arch/powerpc/kernel/module.c | 52 +++++++++++++-------------- arch/s390/kernel/module.c | 33 ++++++++--------- arch/x86/kernel/module.c | 33 +++++++++-------- include/linux/execmem.h | 14 ++++++++ mm/execmem.c | 50 ++++++++++++++++++++++---- 7 files changed, 168 insertions(+), 118 deletions(-) diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c index d59c36dc0494..f66d479c1c7d 100644 --- a/arch/arm/kernel/module.c +++ b/arch/arm/kernel/module.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -34,23 +35,26 @@ #endif #ifdef CONFIG_MMU -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params = { + .modules = { + .text = { + .start = MODULES_VADDR, + .end = MODULES_END, + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - gfp_t gfp_mask = GFP_KERNEL; - void *p; - - /* Silence the initial allocation */ - if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS)) - gfp_mask |= __GFP_NOWARN; - - p = __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, - gfp_mask, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE, - __builtin_return_address(0)); - if (!IS_ENABLED(CONFIG_ARM_MODULE_PLTS) || p) - return p; - return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, - GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE, - __builtin_return_address(0)); + execmem_params.modules.text.pgprot = PAGE_KERNEL_EXEC; + + if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS)) { + execmem_params.modules.text.fallback_start = VMALLOC_START; + execmem_params.modules.text.fallback_end = VMALLOC_END; + } + + return &execmem_params; } #endif diff --git a/arch/arm64/kernel/module.c b/arch/arm64/kernel/module.c index 5af4975caeb5..c3d999f3a3dd 100644 --- a/arch/arm64/kernel/module.c +++ b/arch/arm64/kernel/module.c @@ -17,56 +17,50 @@ #include #include #include +#include #include #include #include #include -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params = { + .modules = { + .flags = EXECMEM_KASAN_SHADOW, + .text = { + .alignment = MODULE_ALIGN, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { u64 module_alloc_end = module_alloc_base + MODULES_VSIZE; - gfp_t gfp_mask = GFP_KERNEL; - void *p; - - /* Silence the initial allocation */ - if (IS_ENABLED(CONFIG_ARM64_MODULE_PLTS)) - gfp_mask |= __GFP_NOWARN; - if (IS_ENABLED(CONFIG_KASAN_GENERIC) || - IS_ENABLED(CONFIG_KASAN_SW_TAGS)) - /* don't exceed the static module region - see below */ - module_alloc_end = MODULES_END; + execmem_params.modules.text.pgprot = PAGE_KERNEL; + execmem_params.modules.text.start = module_alloc_base; + execmem_params.modules.text.end = module_alloc_end; - p = __vmalloc_node_range(size, MODULE_ALIGN, module_alloc_base, - module_alloc_end, gfp_mask, PAGE_KERNEL, VM_DEFER_KMEMLEAK, - NUMA_NO_NODE, __builtin_return_address(0)); - - if (!p && IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) && + /* + * KASAN without KASAN_VMALLOC can only deal with module + * allocations being served from the reserved module region, + * since the remainder of the vmalloc region is already + * backed by zero shadow pages, and punching holes into it + * is non-trivial. Since the module region is not randomized + * when KASAN is enabled without KASAN_VMALLOC, it is even + * less likely that the module region gets exhausted, so we + * can simply omit this fallback in that case. + */ + if (IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) && (IS_ENABLED(CONFIG_KASAN_VMALLOC) || (!IS_ENABLED(CONFIG_KASAN_GENERIC) && - !IS_ENABLED(CONFIG_KASAN_SW_TAGS)))) - /* - * KASAN without KASAN_VMALLOC can only deal with module - * allocations being served from the reserved module region, - * since the remainder of the vmalloc region is already - * backed by zero shadow pages, and punching holes into it - * is non-trivial. Since the module region is not randomized - * when KASAN is enabled without KASAN_VMALLOC, it is even - * less likely that the module region gets exhausted, so we - * can simply omit this fallback in that case. - */ - p = __vmalloc_node_range(size, MODULE_ALIGN, module_alloc_base, - module_alloc_base + SZ_2G, GFP_KERNEL, - PAGE_KERNEL, 0, NUMA_NO_NODE, - __builtin_return_address(0)); - - if (p && (kasan_alloc_module_shadow(p, size, gfp_mask) < 0)) { - vfree(p); - return NULL; + !IS_ENABLED(CONFIG_KASAN_SW_TAGS)))) { + unsigned long end = module_alloc_base + SZ_2G; + + execmem_params.modules.text.fallback_start = module_alloc_base; + execmem_params.modules.text.fallback_end = end; } - /* Memory is intended to be executable, reset the pointer tag. */ - return kasan_reset_tag(p); + return &execmem_params; } enum aarch64_reloc_op { diff --git a/arch/powerpc/kernel/module.c b/arch/powerpc/kernel/module.c index f6d6ae0a1692..ba7abff77d98 100644 --- a/arch/powerpc/kernel/module.c +++ b/arch/powerpc/kernel/module.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -89,39 +90,38 @@ int module_finalize(const Elf_Ehdr *hdr, return 0; } -static __always_inline void * -__module_alloc(unsigned long size, unsigned long start, unsigned long end, bool nowarn) +static struct execmem_params execmem_params = { + .modules = { + .text = { + .alignment = 1, + }, + }, +}; + + +struct execmem_params __init *execmem_arch_params(void) { pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC; - gfp_t gfp = GFP_KERNEL | (nowarn ? __GFP_NOWARN : 0); - - /* - * Don't do huge page allocations for modules yet until more testing - * is done. STRICT_MODULE_RWX may require extra work to support this - * too. - */ - return __vmalloc_node_range(size, 1, start, end, gfp, prot, - VM_FLUSH_RESET_PERMS, - NUMA_NO_NODE, __builtin_return_address(0)); -} -void *module_alloc(unsigned long size) -{ #ifdef MODULES_VADDR unsigned long limit = (unsigned long)_etext - SZ_32M; - void *ptr = NULL; - - BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); /* First try within 32M limit from _etext to avoid branch trampolines */ - if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) - ptr = __module_alloc(size, limit, MODULES_END, true); - - if (!ptr) - ptr = __module_alloc(size, MODULES_VADDR, MODULES_END, false); - - return ptr; + if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) { + execmem_params.modules.text.start = limit; + execmem_params.modules.text.end = MODULES_END; + execmem_params.modules.text.fallback_start = MODULES_VADDR; + execmem_params.modules.text.fallback_end = MODULES_END; + } else { + execmem_params.modules.text.start = MODULES_VADDR; + execmem_params.modules.text.end = MODULES_END; + } #else - return __module_alloc(size, VMALLOC_START, VMALLOC_END, false); + execmem_params.modules.text.start = VMALLOC_START; + execmem_params.modules.text.end = VMALLOC_END; #endif + + execmem_params.modules.text.pgprot = prot; + + return &execmem_params; } diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c index 4a844683dc76..7fff395d26ea 100644 --- a/arch/s390/kernel/module.c +++ b/arch/s390/kernel/module.c @@ -55,23 +55,24 @@ static unsigned long get_module_load_offset(void) return module_load_offset; } -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params = { + .modules = { + .flags = EXECMEM_KASAN_SHADOW, + .text = { + .alignment = MODULE_ALIGN, + .pgprot = PAGE_KERNEL, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - gfp_t gfp_mask = GFP_KERNEL; - void *p; - - if (PAGE_ALIGN(size) > MODULES_LEN) - return NULL; - p = __vmalloc_node_range(size, MODULE_ALIGN, - MODULES_VADDR + get_module_load_offset(), - MODULES_END, gfp_mask, PAGE_KERNEL, - VM_FLUSH_RESET_PERMS | VM_DEFER_KMEMLEAK, - NUMA_NO_NODE, __builtin_return_address(0)); - if (p && (kasan_alloc_module_shadow(p, size, gfp_mask) < 0)) { - vfree(p); - return NULL; - } - return p; + unsigned long start = MODULES_VADDR + get_module_load_offset(); + + execmem_params.modules.text.start = start; + execmem_params.modules.text.end = MODULES_END; + + return &execmem_params; } #ifdef CONFIG_FUNCTION_TRACER diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c index b05f62ee2344..cf9a7d0a8b62 100644 --- a/arch/x86/kernel/module.c +++ b/arch/x86/kernel/module.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include @@ -65,26 +66,24 @@ static unsigned long int get_module_load_offset(void) } #endif -void *module_alloc(unsigned long size) -{ - gfp_t gfp_mask = GFP_KERNEL; - void *p; - - if (PAGE_ALIGN(size) > MODULES_LEN) - return NULL; +static struct execmem_params execmem_params = { + .modules = { + .flags = EXECMEM_KASAN_SHADOW, + .text = { + .alignment = MODULE_ALIGN, + }, + }, +}; - p = __vmalloc_node_range(size, MODULE_ALIGN, - MODULES_VADDR + get_module_load_offset(), - MODULES_END, gfp_mask, PAGE_KERNEL, - VM_FLUSH_RESET_PERMS | VM_DEFER_KMEMLEAK, - NUMA_NO_NODE, __builtin_return_address(0)); +struct execmem_params __init *execmem_arch_params(void) +{ + unsigned long start = MODULES_VADDR + get_module_load_offset(); - if (p && (kasan_alloc_module_shadow(p, size, gfp_mask) < 0)) { - vfree(p); - return NULL; - } + execmem_params.modules.text.start = start; + execmem_params.modules.text.end = MODULES_END; + execmem_params.modules.text.pgprot = PAGE_KERNEL; - return p; + return &execmem_params; } #ifdef CONFIG_X86_32 diff --git a/include/linux/execmem.h b/include/linux/execmem.h index 75946f23731e..68b2bfc79993 100644 --- a/include/linux/execmem.h +++ b/include/linux/execmem.h @@ -9,22 +9,36 @@ * related data allocations * @start: address space start * @end: address space end (inclusive) + * @fallback_start: start of the range for fallback allocations + * @fallback_end: end of the range for fallback allocations (inclusive) * @pgprot: permisssions for memory in this address space * @alignment: alignment required for text allocations */ struct execmem_range { unsigned long start; unsigned long end; + unsigned long fallback_start; + unsigned long fallback_end; pgprot_t pgprot; unsigned int alignment; }; +/** + * enum execmem_module_flags - options for executable memory allocations + * @EXECMEM_KASAN_SHADOW: allocate kasan shadow + */ +enum execmem_module_flags { + EXECMEM_KASAN_SHADOW = (1 << 0), +}; + /** * struct execmem_modules_range - architecure parameters for modules address * space + * @flags: options for module memory allocations * @text: address range for text allocations */ struct execmem_modules_range { + enum execmem_module_flags flags; struct execmem_range text; }; diff --git a/mm/execmem.c b/mm/execmem.c index c92878cf4d1a..2fe36dcc7bdf 100644 --- a/mm/execmem.c +++ b/mm/execmem.c @@ -7,12 +7,46 @@ struct execmem_params execmem_params; -static void *execmem_alloc(size_t size, unsigned long start, unsigned long end, - unsigned int align, pgprot_t pgprot) +static void *execmem_alloc(size_t len, unsigned long start, unsigned long end, + unsigned int alignment, pgprot_t pgprot, + unsigned long fallback_start, + unsigned long fallback_end, + bool kasan) { - return __vmalloc_node_range(size, align, start, end, - GFP_KERNEL, pgprot, VM_FLUSH_RESET_PERMS, - NUMA_NO_NODE, __builtin_return_address(0)); + unsigned long vm_flags = VM_FLUSH_RESET_PERMS; + bool fallback = !!fallback_start; + gfp_t gfp_flags = GFP_KERNEL; + void *p; + + if (PAGE_ALIGN(len) > (end - start)) + return NULL; + + if (kasan) + vm_flags |= VM_DEFER_KMEMLEAK; + + if (fallback) + gfp_flags |= __GFP_NOWARN; + + p = __vmalloc_node_range(len, alignment, start, end, gfp_flags, + pgprot, vm_flags, NUMA_NO_NODE, + __builtin_return_address(0)); + + if (!p && fallback) { + start = fallback_start; + end = fallback_end; + gfp_flags = GFP_KERNEL; + + p = __vmalloc_node_range(len, alignment, start, end, gfp_flags, + pgprot, vm_flags, NUMA_NO_NODE, + __builtin_return_address(0)); + } + + if (p && kasan && (kasan_alloc_module_shadow(p, len, GFP_KERNEL) < 0)) { + vfree(p); + return NULL; + } + + return kasan_reset_tag(p); } void *execmem_text_alloc(size_t size) @@ -21,11 +55,15 @@ void *execmem_text_alloc(size_t size) unsigned long end = execmem_params.modules.text.end; pgprot_t pgprot = execmem_params.modules.text.pgprot; unsigned int align = execmem_params.modules.text.alignment; + unsigned long fallback_start = execmem_params.modules.text.fallback_start; + unsigned long fallback_end = execmem_params.modules.text.fallback_end; + bool kasan = execmem_params.modules.flags & EXECMEM_KASAN_SHADOW; if (!execmem_params.modules.text.start) return module_alloc(size); - return execmem_alloc(size, start, end, align, pgprot); + return execmem_alloc(size, start, end, align, pgprot, + fallback_start, fallback_end, kasan); } void execmem_free(void *ptr)