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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 v3 03/13] mm/execmem, arch: convert simple overrides of module_alloc to execmem Date: Mon, 18 Sep 2023 10:29:45 +0300 Message-Id: <20230918072955.2507221-4-rppt@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230918072955.2507221-1-rppt@kernel.org> References: <20230918072955.2507221-1-rppt@kernel.org> MIME-Version: 1.0 X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 3F85720013 X-Stat-Signature: 3owzgx8k3jybjp6boghiaaixnf7amgbm X-Rspam-User: X-HE-Tag: 1695022249-601090 X-HE-Meta: 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 vua5Zpyy ocn5R4hmKN1AHdsFJIGs5JdbUFh+mZODVcH3pKf6zQByeYlhahZdFDqDPzBbDDRrCZFmX79Wif7lXql06eb61ngxpgQPQVHqzwly2TBy/ZSt37X57JevrkuxxER6tcC3GMT63tenjsgBdCW/S0Hd6vt1C1/3HddzMfCzFUKlkr3pOsFxSF9MAZx5zaTL+l6U6Svlj8rSDAPI0ZNjqiGOMMpi/bUUG1WTrkwU+aWyZpGta7SN42biQcMleOLh4sl4ui6bg9XsJMqOPxuIJT25EFIvpCJKaz21jUk8WHhwW+uUcXCT6DQ3SV9VeC1al/m5LehNWQBuA12hbDIrzkTa+ZhoV/x3yIJ2+nPuZ0VJHVID01kAsANoeNj7ajrftXsJs0na/G0/CLw/zJBMbJNnbwM3WUtY01TbYhn8DbwWld3eJJcc7QYk2P6wwqJvUPOi/ldZSA1+libH/nHs= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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_params structure and implement execmem_arch_params() 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 initialization of the core memory management. The execmem provides execmem_text_alloc() API that wraps __vmalloc_node_range() with the parameters defined by the architectures. If an architecture does not implement execmem_arch_params(), execmem_text_alloc() will fall back to module_alloc(). The name execmem_text_alloc() emphasizes that the allocated memory is for executable code, the allocations of the associated data, like data sections of a module will use execmem_data_alloc() interface that will be added later. Signed-off-by: Mike Rapoport (IBM) --- arch/loongarch/kernel/module.c | 18 ++++++++-- arch/mips/kernel/module.c | 19 +++++++--- arch/nios2/kernel/module.c | 19 +++++++--- arch/parisc/kernel/module.c | 23 +++++++----- arch/riscv/kernel/module.c | 20 ++++++++--- arch/sparc/kernel/module.c | 44 +++++++++++------------ include/linux/execmem.h | 44 +++++++++++++++++++++++ mm/execmem.c | 66 ++++++++++++++++++++++++++++++++-- mm/mm_init.c | 2 ++ 9 files changed, 203 insertions(+), 52 deletions(-) diff --git a/arch/loongarch/kernel/module.c b/arch/loongarch/kernel/module.c index b8b86088b2dd..a1d8fe9796fa 100644 --- a/arch/loongarch/kernel/module.c +++ b/arch/loongarch/kernel/module.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -469,10 +470,21 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, return 0; } -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params __ro_after_init = { + .ranges = { + [EXECMEM_DEFAULT] = { + .pgprot = PAGE_KERNEL, + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, - GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE, __builtin_return_address(0)); + execmem_params.ranges[EXECMEM_DEFAULT].start = MODULES_VADDR; + execmem_params.ranges[EXECMEM_DEFAULT].end = MODULES_END; + + return &execmem_params; } 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 0c936cbf20c5..1c959074b35f 100644 --- a/arch/mips/kernel/module.c +++ b/arch/mips/kernel/module.c @@ -20,6 +20,7 @@ #include #include #include +#include extern void jump_label_apply_nops(struct module *mod); @@ -33,11 +34,21 @@ static LIST_HEAD(dbe_list); static DEFINE_SPINLOCK(dbe_lock); #ifdef MODULE_START -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params __ro_after_init = { + .ranges = { + [EXECMEM_DEFAULT] = { + .start = MODULE_START, + .end = MODULE_END, + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - return __vmalloc_node_range(size, 1, MODULE_START, MODULE_END, - GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE, - __builtin_return_address(0)); + execmem_params.ranges[EXECMEM_DEFAULT].pgprot = PAGE_KERNEL; + + return &execmem_params; } #endif diff --git a/arch/nios2/kernel/module.c b/arch/nios2/kernel/module.c index 9c97b7513853..5a8df4f9c04e 100644 --- a/arch/nios2/kernel/module.c +++ b/arch/nios2/kernel/module.c @@ -18,15 +18,24 @@ #include #include #include +#include #include -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params __ro_after_init = { + .ranges = { + [EXECMEM_DEFAULT] = { + .start = MODULES_VADDR, + .end = MODULES_END, + .pgprot = PAGE_KERNEL_EXEC, + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(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)); + return &execmem_params; } 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..0c6dfd1daef3 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 +174,21 @@ static inline int reassemble_22(int as22) ((as22 & 0x0003ff) << 3)); } -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params __ro_after_init = { + .ranges = { + [EXECMEM_DEFAULT] = { + .pgprot = PAGE_KERNEL_RWX, + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(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_params.ranges[EXECMEM_DEFAULT].start = VMALLOC_START; + execmem_params.ranges[EXECMEM_DEFAULT].end = VMALLOC_END; + + return &execmem_params; } #ifndef CONFIG_64BIT diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c index 7c651d55fcbd..343a0edfb6dd 100644 --- a/arch/riscv/kernel/module.c +++ b/arch/riscv/kernel/module.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -436,12 +437,21 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, } #if defined(CONFIG_MMU) && defined(CONFIG_64BIT) -void *module_alloc(unsigned long size) +static struct execmem_params execmem_params __ro_after_init = { + .ranges = { + [EXECMEM_DEFAULT] = { + .pgprot = PAGE_KERNEL, + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - return __vmalloc_node_range(size, 1, MODULES_VADDR, - MODULES_END, GFP_KERNEL, - PAGE_KERNEL, 0, NUMA_NO_NODE, - __builtin_return_address(0)); + execmem_params.ranges[EXECMEM_DEFAULT].start = MODULES_VADDR; + execmem_params.ranges[EXECMEM_DEFAULT].end = MODULES_END; + + return &execmem_params; } #endif diff --git a/arch/sparc/kernel/module.c b/arch/sparc/kernel/module.c index 66c45a2764bc..1d8d1fba95b9 100644 --- a/arch/sparc/kernel/module.c +++ b/arch/sparc/kernel/module.c @@ -14,6 +14,10 @@ #include #include #include +#include +#ifdef CONFIG_SPARC64 +#include +#endif #include #include @@ -21,34 +25,26 @@ #include "entry.h" +static struct execmem_params execmem_params __ro_after_init = { + .ranges = { + [EXECMEM_DEFAULT] = { #ifdef CONFIG_SPARC64 - -#include - -static void *module_map(unsigned long size) -{ - if (PAGE_ALIGN(size) > MODULES_LEN) - return NULL; - return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, - GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE, - __builtin_return_address(0)); -} + .start = MODULES_VADDR, + .end = MODULES_END, #else -static void *module_map(unsigned long size) -{ - return vmalloc(size); -} -#endif /* CONFIG_SPARC64 */ - -void *module_alloc(unsigned long size) + .start = VMALLOC_START, + .end = VMALLOC_END, +#endif + .alignment = 1, + }, + }, +}; + +struct execmem_params __init *execmem_arch_params(void) { - void *ret; - - ret = module_map(size); - if (ret) - memset(ret, 0, size); + execmem_params.ranges[EXECMEM_DEFAULT].pgprot = PAGE_KERNEL; - return ret; + return &execmem_params; } /* Make generic code ignore STT_REGISTER dummy undefined symbols. */ diff --git a/include/linux/execmem.h b/include/linux/execmem.h index 3491bf7e9714..44e213625053 100644 --- a/include/linux/execmem.h +++ b/include/linux/execmem.h @@ -32,6 +32,44 @@ enum execmem_type { EXECMEM_TYPE_MAX, }; +/** + * struct execmem_range - definition of a memory range 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_params - architecture parameters for code allocations + * @ranges: array of ranges defining architecture specific parameters for + * each type of executable memory allocations + */ +struct execmem_params { + struct execmem_range ranges[EXECMEM_TYPE_MAX]; +}; + +/** + * execmem_arch_params - supply parameters for allocations of executable memory + * + * A hook for architectures to define parameters for allocations of + * executable memory described by struct execmem_params + * + * 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_params *execmem_arch_params(void); + /** * execmem_text_alloc - allocate executable memory * @type: type of the allocation @@ -53,4 +91,10 @@ void *execmem_text_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 638dc2b26a81..f25a5e064886 100644 --- a/mm/execmem.c +++ b/mm/execmem.c @@ -5,14 +5,26 @@ #include #include -static void *execmem_alloc(size_t size) +static struct execmem_params execmem_params; + +static void *execmem_alloc(size_t size, struct execmem_range *range) { - 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_text_alloc(enum execmem_type type, size_t size) { - return execmem_alloc(size); + if (!execmem_params.ranges[type].start) + return module_alloc(size); + + return execmem_alloc(size, &execmem_params.ranges[type]); } void execmem_free(void *ptr) @@ -24,3 +36,51 @@ void execmem_free(void *ptr) WARN_ON(in_interrupt()); vfree(ptr); } + +struct execmem_params * __weak execmem_arch_params(void) +{ + return NULL; +} + +static bool execmem_validate_params(struct execmem_params *p) +{ + struct execmem_range *r = &p->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_params *p) +{ + struct execmem_range *default_range = &p->ranges[EXECMEM_DEFAULT]; + + for (int i = EXECMEM_DEFAULT + 1; i < EXECMEM_TYPE_MAX; i++) { + struct execmem_range *r = &p->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; + } + } +} + +void __init execmem_init(void) +{ + struct execmem_params *p = execmem_arch_params(); + + if (!p) + return; + + if (!execmem_validate_params(p)) + return; + + execmem_init_missing(p); + + execmem_params = *p; +} diff --git a/mm/mm_init.c b/mm/mm_init.c index 50f2f34745af..7c002b36da21 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -26,6 +26,7 @@ #include #include #include +#include #include "internal.h" #include "slab.h" #include "shuffle.h" @@ -2797,4 +2798,5 @@ void __init mm_core_init(void) pti_init(); kmsan_init_runtime(); mm_cache_init(); + execmem_init(); }