Re: [PATCH v2 05/12] modules, execmem: drop module_alloc
From: Song Liu <song@kernel.org>
Date: 2023-06-16 18:56:31
Also in:
bpf, linux-arm-kernel, linux-mips, linux-mm, linux-modules, linux-riscv, linux-s390, linux-trace-kernel, lkml, loongarch, netdev, sparclinux
On Fri, Jun 16, 2023 at 1:51 AM Mike Rapoport [off-list ref] wrote:
From: "Mike Rapoport (IBM)" <rppt@kernel.org> Define default parameters for address range for code allocations using the current values in module_alloc() and make execmem_text_alloc() use these defaults when an architecure does not supply its specific parameters. With this, execmem_text_alloc() implements memory allocation in a way compatible with module_alloc() and can be used as a replacement for module_alloc(). Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Acked-by: Song Liu <song@kernel.org>
quoted hunk ↗ jump to hunk
--- include/linux/execmem.h | 8 ++++++++ include/linux/moduleloader.h | 12 ------------ kernel/module/main.c | 7 ------- mm/execmem.c | 12 ++++++++---- 4 files changed, 16 insertions(+), 23 deletions(-)diff --git a/include/linux/execmem.h b/include/linux/execmem.h index 68b2bfc79993..b9a97fcdf3c5 100644 --- a/include/linux/execmem.h +++ b/include/linux/execmem.h@@ -4,6 +4,14 @@ #include <linux/types.h> +#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \ + !defined(CONFIG_KASAN_VMALLOC) +#include <linux/kasan.h> +#define MODULE_ALIGN (PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT) +#else +#define MODULE_ALIGN PAGE_SIZE +#endif + /** * struct execmem_range - definition of a memory range suitable for code and * related data allocationsdiff --git a/include/linux/moduleloader.h b/include/linux/moduleloader.h index b3374342f7af..4321682fe849 100644 --- a/include/linux/moduleloader.h +++ b/include/linux/moduleloader.h@@ -25,10 +25,6 @@ int module_frob_arch_sections(Elf_Ehdr *hdr, /* Additional bytes needed by arch in front of individual sections */ unsigned int arch_mod_section_prepend(struct module *mod, unsigned int section); -/* Allocator used for allocating struct module, core sections and init - sections. Returns NULL on failure. */ -void *module_alloc(unsigned long size); - /* Determines if the section name is an init section (that is only used during * module loading). */@@ -113,12 +109,4 @@ void module_arch_cleanup(struct module *mod); /* Any cleanup before freeing mod->module_init */ void module_arch_freeing_init(struct module *mod); -#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \ - !defined(CONFIG_KASAN_VMALLOC) -#include <linux/kasan.h> -#define MODULE_ALIGN (PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT) -#else -#define MODULE_ALIGN PAGE_SIZE -#endif - #endifdiff --git a/kernel/module/main.c b/kernel/module/main.c index 43810a3bdb81..b445c5ad863a 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c@@ -1600,13 +1600,6 @@ static void free_modinfo(struct module *mod) } } -void * __weak module_alloc(unsigned long size) -{ - return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, - GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS, - NUMA_NO_NODE, __builtin_return_address(0)); -} - bool __weak module_init_section(const char *name) { return strstarts(name, ".init");diff --git a/mm/execmem.c b/mm/execmem.c index 2fe36dcc7bdf..a67acd75ffef 100644 --- a/mm/execmem.c +++ b/mm/execmem.c@@ -59,9 +59,6 @@ void *execmem_text_alloc(size_t size) 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, fallback_start, fallback_end, kasan); }@@ -108,8 +105,15 @@ void __init execmem_init(void) { struct execmem_params *p = execmem_arch_params(); - if (!p) + if (!p) { + p = &execmem_params; + p->modules.text.start = VMALLOC_START; + p->modules.text.end = VMALLOC_END; + p->modules.text.pgprot = PAGE_KERNEL_EXEC; + p->modules.text.alignment = 1; + return; + } if (!execmem_validate_params(p)) return; --2.35.1