From patchwork Sun May 5 14:25:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13654281 X-Patchwork-Delegate: bpf@iogearbox.net 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 10A222747F; Sun, 5 May 2024 14:27:34 +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=1714919254; cv=none; b=pdGpV+7UJ2VD6HPsKBtumuvRxdrvdA/ISK6PnJBnJWmQji3JN/xv2G6tSKE2MoxXAmzrYQR4Eblp2m8kW8ja37nzCQ8X+IZDXoeAaSCou2hcbuae022OQXBy/oW08XopMLDzfHakwwSbl6ijSNGyKZzu/a7f7N8CWorBPiW1Trg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714919254; c=relaxed/simple; bh=O80Ih29W+vz+LMoOHSIificIIW/tpeoH6wwn4K1HsxQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=u2dc35U5NegfDHZ8QKIS4DiUqeIsuKGvFwYJChh6zaEgjmBCX6/d+p4heTy5QJ2nAIzdyAs+ApfKeddtejOptEzYBM6HEoAjQ4F2cX9tWJBfAx+yf5q6pofCxWso39LeHq1lbFJ06/thgi2g/zBTEWHIGb3jXaFKJCsHi+pDR7w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BilCkbtO; 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="BilCkbtO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 75D78C4AF18; Sun, 5 May 2024 14:27:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1714919253; bh=O80Ih29W+vz+LMoOHSIificIIW/tpeoH6wwn4K1HsxQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BilCkbtOLxKBPWJaAGrji96oFgWEqeIluXUtysOn4QHKtZ7B+5JzxWirvapkPBhn5 8q5ozXQa8/f6BgkfO7Z5j/Rlm2QnRJ/pSRQ0vhHqoWs6DhTy29FLQ1j/aq+4dUh/F+ AW03HvVGaefapZhOPACjNFGhNe0Ula8pc7JkVkSVH04AMVAAZO8Gfh6jkzvuOI0aRZ vWYh4eKs2g6ScyNHJJ5NRWGw0ctOcEf0HJwmlN4RT+hTsX9htADU8CooWWRPvzLgiw jsu7vr9XhoiXY3h3NOwAf4PBU7Bgg+Xcm9sqXRAd8WXItWiSf8Aw0lXSvtF4iBjlyE ggI6GFuSe9YEQ== 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 v8 06/17] mm: introduce execmem_alloc() and execmem_free() Date: Sun, 5 May 2024 17:25:49 +0300 Message-ID: <20240505142600.2322517-7-rppt@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240505142600.2322517-1-rppt@kernel.org> References: <20240505142600.2322517-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net From: "Mike Rapoport (IBM)" module_alloc() is used everywhere as a mean to allocate memory for code. Beside being semantically wrong, this unnecessarily ties all subsystems that need to allocate code, such as ftrace, kprobes and BPF to modules and puts the burden of code allocation to the modules code. Several architectures override module_alloc() because of various constraints where the executable memory can be located and this causes additional obstacles for improvements of code allocation. Start splitting code allocation from modules by introducing execmem_alloc() and execmem_free() APIs. Initially, execmem_alloc() is a wrapper for module_alloc() and execmem_free() is a replacement of module_memfree() to allow updating all call sites to use the new APIs. Since architectures define different restrictions on placement, permissions, alignment and other parameters for memory that can be used by different subsystems that allocate executable memory, execmem_alloc() takes a type argument, that will be used to identify the calling subsystem and to allow architectures define parameters for ranges suitable for that subsystem. No functional changes. Signed-off-by: Mike Rapoport (IBM) Acked-by: Masami Hiramatsu (Google) Acked-by: Song Liu Acked-by: Steven Rostedt (Google) --- arch/powerpc/kernel/kprobes.c | 6 ++-- arch/s390/kernel/ftrace.c | 4 +-- arch/s390/kernel/kprobes.c | 4 +-- arch/s390/kernel/module.c | 5 +-- arch/sparc/net/bpf_jit_comp_32.c | 8 ++--- arch/x86/kernel/ftrace.c | 6 ++-- arch/x86/kernel/kprobes/core.c | 4 +-- include/linux/execmem.h | 57 ++++++++++++++++++++++++++++++++ include/linux/moduleloader.h | 3 -- kernel/bpf/core.c | 6 ++-- kernel/kprobes.c | 8 ++--- kernel/module/Kconfig | 1 + kernel/module/main.c | 25 +++++--------- mm/Kconfig | 3 ++ mm/Makefile | 1 + mm/execmem.c | 32 ++++++++++++++++++ 16 files changed, 128 insertions(+), 45 deletions(-) create mode 100644 include/linux/execmem.h create mode 100644 mm/execmem.c diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index bbca90a5e2ec..9fcd01bb2ce6 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -19,8 +19,8 @@ #include #include #include -#include #include +#include #include #include #include @@ -130,7 +130,7 @@ void *alloc_insn_page(void) { void *page; - page = module_alloc(PAGE_SIZE); + page = execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE); if (!page) return NULL; @@ -142,7 +142,7 @@ void *alloc_insn_page(void) } return page; error: - module_memfree(page); + execmem_free(page); return NULL; } diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c index c46381ea04ec..798249ef5646 100644 --- a/arch/s390/kernel/ftrace.c +++ b/arch/s390/kernel/ftrace.c @@ -7,13 +7,13 @@ * Author(s): Martin Schwidefsky */ -#include #include #include #include #include #include #include +#include #include #include #include @@ -220,7 +220,7 @@ static int __init ftrace_plt_init(void) { const char *start, *end; - ftrace_plt = module_alloc(PAGE_SIZE); + ftrace_plt = execmem_alloc(EXECMEM_FTRACE, PAGE_SIZE); if (!ftrace_plt) panic("cannot allocate ftrace plt\n"); diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c index f0cf20d4b3c5..3c1b1be744de 100644 --- a/arch/s390/kernel/kprobes.c +++ b/arch/s390/kernel/kprobes.c @@ -9,7 +9,6 @@ #define pr_fmt(fmt) "kprobes: " fmt -#include #include #include #include @@ -21,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -38,7 +38,7 @@ void *alloc_insn_page(void) { void *page; - page = module_alloc(PAGE_SIZE); + page = execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE); if (!page) return NULL; set_memory_rox((unsigned long)page, 1); diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c index 42215f9404af..ac97a905e8cd 100644 --- a/arch/s390/kernel/module.c +++ b/arch/s390/kernel/module.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -76,7 +77,7 @@ void *module_alloc(unsigned long size) #ifdef CONFIG_FUNCTION_TRACER void module_arch_cleanup(struct module *mod) { - module_memfree(mod->arch.trampolines_start); + execmem_free(mod->arch.trampolines_start); } #endif @@ -510,7 +511,7 @@ static int module_alloc_ftrace_hotpatch_trampolines(struct module *me, size = FTRACE_HOTPATCH_TRAMPOLINES_SIZE(s->sh_size); numpages = DIV_ROUND_UP(size, PAGE_SIZE); - start = module_alloc(numpages * PAGE_SIZE); + start = execmem_alloc(EXECMEM_FTRACE, numpages * PAGE_SIZE); if (!start) return -ENOMEM; set_memory_rox((unsigned long)start, numpages); diff --git a/arch/sparc/net/bpf_jit_comp_32.c b/arch/sparc/net/bpf_jit_comp_32.c index da2df1e84ed4..bda2dbd3f4c5 100644 --- a/arch/sparc/net/bpf_jit_comp_32.c +++ b/arch/sparc/net/bpf_jit_comp_32.c @@ -1,10 +1,10 @@ // SPDX-License-Identifier: GPL-2.0 -#include #include #include #include #include #include +#include #include #include @@ -713,7 +713,7 @@ cond_branch: f_offset = addrs[i + filter[i].jf]; if (unlikely(proglen + ilen > oldproglen)) { pr_err("bpb_jit_compile fatal error\n"); kfree(addrs); - module_memfree(image); + execmem_free(image); return; } memcpy(image + proglen, temp, ilen); @@ -736,7 +736,7 @@ cond_branch: f_offset = addrs[i + filter[i].jf]; break; } if (proglen == oldproglen) { - image = module_alloc(proglen); + image = execmem_alloc(EXECMEM_BPF, proglen); if (!image) goto out; } @@ -758,7 +758,7 @@ cond_branch: f_offset = addrs[i + filter[i].jf]; void bpf_jit_free(struct bpf_prog *fp) { if (fp->jited) - module_memfree(fp->bpf_func); + execmem_free(fp->bpf_func); bpf_prog_unlock_free(fp); } diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index 70139d9d2e01..c8ddb7abda7c 100644 --- a/arch/x86/kernel/ftrace.c +++ b/arch/x86/kernel/ftrace.c @@ -25,6 +25,7 @@ #include #include #include +#include #include @@ -261,15 +262,14 @@ void arch_ftrace_update_code(int command) #ifdef CONFIG_X86_64 #ifdef CONFIG_MODULES -#include /* Module allocation simplifies allocating memory for code */ static inline void *alloc_tramp(unsigned long size) { - return module_alloc(size); + return execmem_alloc(EXECMEM_FTRACE, size); } static inline void tramp_free(void *tramp) { - module_memfree(tramp); + execmem_free(tramp); } #else /* Trampolines can only be created if modules are supported */ diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c index d0e49bd7c6f3..72e6a45e7ec2 100644 --- a/arch/x86/kernel/kprobes/core.c +++ b/arch/x86/kernel/kprobes/core.c @@ -40,12 +40,12 @@ #include #include #include -#include #include #include #include #include #include +#include #include #include @@ -495,7 +495,7 @@ void *alloc_insn_page(void) { void *page; - page = module_alloc(PAGE_SIZE); + page = execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE); if (!page) return NULL; diff --git a/include/linux/execmem.h b/include/linux/execmem.h new file mode 100644 index 000000000000..8eebc8ef66e7 --- /dev/null +++ b/include/linux/execmem.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_EXECMEM_ALLOC_H +#define _LINUX_EXECMEM_ALLOC_H + +#include +#include + +/** + * enum execmem_type - types of executable memory ranges + * + * There are several subsystems that allocate executable memory. + * Architectures define different restrictions on placement, + * permissions, alignment and other parameters for memory that can be used + * by these subsystems. + * Types in this enum identify subsystems that allocate executable memory + * and let architectures define parameters for ranges suitable for + * allocations by each subsystem. + * + * @EXECMEM_DEFAULT: default parameters that would be used for types that + * are not explicitly defined. + * @EXECMEM_MODULE_TEXT: parameters for module text sections + * @EXECMEM_KPROBES: parameters for kprobes + * @EXECMEM_FTRACE: parameters for ftrace + * @EXECMEM_BPF: parameters for BPF + * @EXECMEM_TYPE_MAX: + */ +enum execmem_type { + EXECMEM_DEFAULT, + EXECMEM_MODULE_TEXT = EXECMEM_DEFAULT, + EXECMEM_KPROBES, + EXECMEM_FTRACE, + EXECMEM_BPF, + EXECMEM_TYPE_MAX, +}; + +/** + * execmem_alloc - allocate executable memory + * @type: type of the allocation + * @size: how many bytes of memory are required + * + * Allocates memory that will contain executable code, either generated or + * loaded from kernel modules. + * + * The memory will have protections defined by architecture for executable + * region of the @type. + * + * Return: a pointer to the allocated memory or %NULL + */ +void *execmem_alloc(enum execmem_type type, size_t size); + +/** + * execmem_free - free executable memory + * @ptr: pointer to the memory that should be freed + */ +void execmem_free(void *ptr); + +#endif /* _LINUX_EXECMEM_ALLOC_H */ diff --git a/include/linux/moduleloader.h b/include/linux/moduleloader.h index 89b1e0ed9811..a3b8caee9405 100644 --- a/include/linux/moduleloader.h +++ b/include/linux/moduleloader.h @@ -29,9 +29,6 @@ unsigned int arch_mod_section_prepend(struct module *mod, unsigned int section); sections. Returns NULL on failure. */ void *module_alloc(unsigned long size); -/* Free memory returned from module_alloc. */ -void module_memfree(void *module_region); - /* Determines if the section name is an init section (that is only used during * module loading). */ diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index 696bc55de8e8..75a54024e2f4 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -22,7 +22,6 @@ #include #include #include -#include #include #include #include @@ -37,6 +36,7 @@ #include #include #include +#include #include #include @@ -1050,12 +1050,12 @@ void bpf_jit_uncharge_modmem(u32 size) void *__weak bpf_jit_alloc_exec(unsigned long size) { - return module_alloc(size); + return execmem_alloc(EXECMEM_BPF, size); } void __weak bpf_jit_free_exec(void *addr) { - module_memfree(addr); + execmem_free(addr); } struct bpf_binary_header * diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 65adc815fc6e..ddd7cdc16edf 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -26,7 +26,6 @@ #include #include #include -#include #include #include #include @@ -39,6 +38,7 @@ #include #include #include +#include #include #include @@ -113,17 +113,17 @@ enum kprobe_slot_state { void __weak *alloc_insn_page(void) { /* - * Use module_alloc() so this page is within +/- 2GB of where the + * Use execmem_alloc() so this page is within +/- 2GB of where the * kernel image and loaded module images reside. This is required * for most of the architectures. * (e.g. x86-64 needs this to handle the %rip-relative fixups.) */ - return module_alloc(PAGE_SIZE); + return execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE); } static void free_insn_page(void *page) { - module_memfree(page); + execmem_free(page); } struct kprobe_insn_cache kprobe_insn_slots = { diff --git a/kernel/module/Kconfig b/kernel/module/Kconfig index f3e0329337f6..744383c1eed1 100644 --- a/kernel/module/Kconfig +++ b/kernel/module/Kconfig @@ -2,6 +2,7 @@ menuconfig MODULES bool "Enable loadable module support" modules + select EXECMEM help Kernel modules are small pieces of compiled code which can be inserted in the running kernel, rather than being diff --git a/kernel/module/main.c b/kernel/module/main.c index 5b82b069e0d3..d56b7df0cbb6 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -57,6 +57,7 @@ #include #include #include +#include #include #include "internal.h" @@ -1179,16 +1180,6 @@ resolve_symbol_wait(struct module *mod, return ksym; } -void __weak module_memfree(void *module_region) -{ - /* - * This memory may be RO, and freeing RO memory in an interrupt is not - * supported by vmalloc. - */ - WARN_ON(in_interrupt()); - vfree(module_region); -} - void __weak module_arch_cleanup(struct module *mod) { } @@ -1213,7 +1204,7 @@ static int module_memory_alloc(struct module *mod, enum mod_mem_type type) if (mod_mem_use_vmalloc(type)) ptr = vmalloc(size); else - ptr = module_alloc(size); + ptr = execmem_alloc(EXECMEM_MODULE_TEXT, size); if (!ptr) return -ENOMEM; @@ -1244,7 +1235,7 @@ static void module_memory_free(struct module *mod, enum mod_mem_type type) if (mod_mem_use_vmalloc(type)) vfree(ptr); else - module_memfree(ptr); + execmem_free(ptr); } static void free_mod_mem(struct module *mod) @@ -2496,9 +2487,9 @@ static void do_free_init(struct work_struct *w) llist_for_each_safe(pos, n, list) { initfree = container_of(pos, struct mod_initfree, node); - module_memfree(initfree->init_text); - module_memfree(initfree->init_data); - module_memfree(initfree->init_rodata); + execmem_free(initfree->init_text); + execmem_free(initfree->init_data); + execmem_free(initfree->init_rodata); kfree(initfree); } } @@ -2608,10 +2599,10 @@ static noinline int do_init_module(struct module *mod) * We want to free module_init, but be aware that kallsyms may be * walking this with preempt disabled. In all the failure paths, we * call synchronize_rcu(), but we don't want to slow down the success - * path. module_memfree() cannot be called in an interrupt, so do the + * path. execmem_free() cannot be called in an interrupt, so do the * work and call synchronize_rcu() in a work queue. * - * Note that module_alloc() on most architectures creates W+X page + * Note that execmem_alloc() on most architectures creates W+X page * mappings which won't be cleaned up until do_free_init() runs. Any * code such as mark_rodata_ro() which depends on those mappings to * be cleaned up needs to sync with the queued work by invoking diff --git a/mm/Kconfig b/mm/Kconfig index b1448aa81e15..f08a216d4793 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1241,6 +1241,9 @@ config LOCK_MM_AND_FIND_VMA config IOMMU_MM_DATA bool +config EXECMEM + bool + source "mm/damon/Kconfig" endmenu diff --git a/mm/Makefile b/mm/Makefile index 4abb40b911ec..001336c91864 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -133,3 +133,4 @@ obj-$(CONFIG_IO_MAPPING) += io-mapping.o obj-$(CONFIG_HAVE_BOOTMEM_INFO_NODE) += bootmem_info.o obj-$(CONFIG_GENERIC_IOREMAP) += ioremap.o obj-$(CONFIG_SHRINKER_DEBUG) += shrinker_debug.o +obj-$(CONFIG_EXECMEM) += execmem.o diff --git a/mm/execmem.c b/mm/execmem.c new file mode 100644 index 000000000000..480adc69b20d --- /dev/null +++ b/mm/execmem.c @@ -0,0 +1,32 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2002 Richard Henderson + * Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. + * Copyright (C) 2023 Luis Chamberlain + * Copyright (C) 2024 Mike Rapoport IBM. + */ + +#include +#include +#include +#include + +static void *__execmem_alloc(size_t size) +{ + return module_alloc(size); +} + +void *execmem_alloc(enum execmem_type type, size_t size) +{ + return __execmem_alloc(size); +} + +void execmem_free(void *ptr) +{ + /* + * This memory may be RO, and freeing RO memory in an interrupt is not + * supported by vmalloc. + */ + WARN_ON(in_interrupt()); + vfree(ptr); +}