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223b5e57d0
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, EXECMEM_MODULE_DATA type required by powerpc, support for allocation of KASAN shadow required by s390 and x86 and support for late initialization of execmem required by arm64. 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) <rppt@kernel.org> Acked-by: Will Deacon <will@kernel.org> Acked-by: Song Liu <song@kernel.org> Tested-by: Liviu Dudau <liviu@dudau.co.uk> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Kernel module help for powerpc.
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Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
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Copyright (C) 2008 Freescale Semiconductor, Inc.
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*/
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#include <linux/elf.h>
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#include <linux/moduleloader.h>
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#include <linux/err.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/bug.h>
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#include <linux/execmem.h>
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#include <asm/module.h>
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#include <linux/uaccess.h>
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#include <asm/firmware.h>
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#include <linux/sort.h>
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#include <asm/setup.h>
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#include <asm/sections.h>
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static LIST_HEAD(module_bug_list);
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static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
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const Elf_Shdr *sechdrs,
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const char *name)
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{
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char *secstrings;
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unsigned int i;
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secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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for (i = 1; i < hdr->e_shnum; i++)
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if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
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return &sechdrs[i];
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return NULL;
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}
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int module_finalize(const Elf_Ehdr *hdr,
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const Elf_Shdr *sechdrs, struct module *me)
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{
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const Elf_Shdr *sect;
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int rc;
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rc = module_finalize_ftrace(me, sechdrs);
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if (rc)
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return rc;
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/* Apply feature fixups */
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sect = find_section(hdr, sechdrs, "__ftr_fixup");
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if (sect != NULL)
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do_feature_fixups(cur_cpu_spec->cpu_features,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup");
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if (sect != NULL)
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do_feature_fixups(cur_cpu_spec->mmu_features,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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#ifdef CONFIG_PPC64
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sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
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if (sect != NULL)
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do_feature_fixups(powerpc_firmware_features,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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#endif /* CONFIG_PPC64 */
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#ifdef CONFIG_PPC64_ELF_ABI_V1
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sect = find_section(hdr, sechdrs, ".opd");
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if (sect != NULL) {
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me->arch.start_opd = sect->sh_addr;
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me->arch.end_opd = sect->sh_addr + sect->sh_size;
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}
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#endif /* CONFIG_PPC64_ELF_ABI_V1 */
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#ifdef CONFIG_PPC_BARRIER_NOSPEC
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sect = find_section(hdr, sechdrs, "__spec_barrier_fixup");
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if (sect != NULL)
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do_barrier_nospec_fixups_range(barrier_nospec_enabled,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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#endif /* CONFIG_PPC_BARRIER_NOSPEC */
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sect = find_section(hdr, sechdrs, "__lwsync_fixup");
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if (sect != NULL)
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do_lwsync_fixups(cur_cpu_spec->cpu_features,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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return 0;
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}
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static struct execmem_info execmem_info __ro_after_init;
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struct execmem_info __init *execmem_arch_setup(void)
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{
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pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC;
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unsigned long fallback_start = 0, fallback_end = 0;
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unsigned long start, end;
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/*
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* BOOK3S_32 and 8xx define MODULES_VADDR for text allocations and
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* allow allocating data in the entire vmalloc space
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*/
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#ifdef MODULES_VADDR
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unsigned long limit = (unsigned long)_etext - SZ_32M;
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BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
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/* First try within 32M limit from _etext to avoid branch trampolines */
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if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) {
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start = limit;
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fallback_start = MODULES_VADDR;
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fallback_end = MODULES_END;
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} else {
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start = MODULES_VADDR;
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}
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end = MODULES_END;
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#else
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start = VMALLOC_START;
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end = VMALLOC_END;
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#endif
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execmem_info = (struct execmem_info){
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.ranges = {
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[EXECMEM_DEFAULT] = {
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.start = start,
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.end = end,
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.pgprot = prot,
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.alignment = 1,
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.fallback_start = fallback_start,
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.fallback_end = fallback_end,
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},
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[EXECMEM_MODULE_DATA] = {
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.start = VMALLOC_START,
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.end = VMALLOC_END,
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.pgprot = PAGE_KERNEL,
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.alignment = 1,
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},
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},
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};
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return &execmem_info;
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}
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