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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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fbf6ad5efe
Currently, a build with CONFIG_EFI=n and CONFIG_KASAN=y will not complete successfully because of missing symbols. This is due to the fact that the __pi_ prefixed aliases for __memcpy/__memmove were put inside a #ifdef CONFIG_EFI block inadvertently, and are therefore missing from the build in question. These definitions should only be provided when needed, as they will otherwise clutter up the symbol table, kallsyms etc for no reason. Fortunately, instead of using CPP conditionals, we can achieve the same result by using the linker's PROVIDE() directive, which only defines a symbol if it is required to complete the link. So let's use that for all symbols alias definitions. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20220629083246.3729177-1-ardb@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
151 lines
5 KiB
C
151 lines
5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Linker script variables to be set after section resolution, as
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* ld.lld does not like variables assigned before SECTIONS is processed.
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*/
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#ifndef __ARM64_KERNEL_IMAGE_VARS_H
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#define __ARM64_KERNEL_IMAGE_VARS_H
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#ifndef LINKER_SCRIPT
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#error This file should only be included in vmlinux.lds.S
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#endif
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PROVIDE(__efistub_kernel_size = _edata - _text);
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PROVIDE(__efistub_primary_entry_offset = primary_entry - _text);
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/*
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* The EFI stub has its own symbol namespace prefixed by __efistub_, to
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* isolate it from the kernel proper. The following symbols are legally
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* accessed by the stub, so provide some aliases to make them accessible.
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* Only include data symbols here, or text symbols of functions that are
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* guaranteed to be safe when executed at another offset than they were
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* linked at. The routines below are all implemented in assembler in a
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* position independent manner
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*/
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PROVIDE(__efistub_memcmp = __pi_memcmp);
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PROVIDE(__efistub_memchr = __pi_memchr);
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PROVIDE(__efistub_memcpy = __pi_memcpy);
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PROVIDE(__efistub_memmove = __pi_memmove);
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PROVIDE(__efistub_memset = __pi_memset);
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PROVIDE(__efistub_strlen = __pi_strlen);
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PROVIDE(__efistub_strnlen = __pi_strnlen);
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PROVIDE(__efistub_strcmp = __pi_strcmp);
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PROVIDE(__efistub_strncmp = __pi_strncmp);
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PROVIDE(__efistub_strrchr = __pi_strrchr);
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PROVIDE(__efistub_dcache_clean_poc = __pi_dcache_clean_poc);
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PROVIDE(__efistub__text = _text);
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PROVIDE(__efistub__end = _end);
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PROVIDE(__efistub__edata = _edata);
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PROVIDE(__efistub_screen_info = screen_info);
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PROVIDE(__efistub__ctype = _ctype);
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/*
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* The __ prefixed memcpy/memset/memmove symbols are provided by KASAN, which
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* instruments the conventional ones. Therefore, any references from the EFI
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* stub or other position independent, low level C code should be redirected to
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* the non-instrumented versions as well.
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*/
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PROVIDE(__efistub___memcpy = __pi_memcpy);
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PROVIDE(__efistub___memmove = __pi_memmove);
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PROVIDE(__efistub___memset = __pi_memset);
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PROVIDE(__pi___memcpy = __pi_memcpy);
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PROVIDE(__pi___memmove = __pi_memmove);
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PROVIDE(__pi___memset = __pi_memset);
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#ifdef CONFIG_KVM
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/*
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* KVM nVHE code has its own symbol namespace prefixed with __kvm_nvhe_, to
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* separate it from the kernel proper. The following symbols are legally
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* accessed by it, therefore provide aliases to make them linkable.
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* Do not include symbols which may not be safely accessed under hypervisor
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* memory mappings.
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*/
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/* Alternative callbacks for init-time patching of nVHE hyp code. */
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KVM_NVHE_ALIAS(kvm_patch_vector_branch);
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KVM_NVHE_ALIAS(kvm_update_va_mask);
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KVM_NVHE_ALIAS(kvm_get_kimage_voffset);
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KVM_NVHE_ALIAS(kvm_compute_final_ctr_el0);
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KVM_NVHE_ALIAS(spectre_bhb_patch_loop_iter);
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KVM_NVHE_ALIAS(spectre_bhb_patch_loop_mitigation_enable);
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KVM_NVHE_ALIAS(spectre_bhb_patch_wa3);
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KVM_NVHE_ALIAS(spectre_bhb_patch_clearbhb);
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/* Global kernel state accessed by nVHE hyp code. */
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KVM_NVHE_ALIAS(kvm_vgic_global_state);
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/* Kernel symbols used to call panic() from nVHE hyp code (via ERET). */
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KVM_NVHE_ALIAS(nvhe_hyp_panic_handler);
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/* Vectors installed by hyp-init on reset HVC. */
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KVM_NVHE_ALIAS(__hyp_stub_vectors);
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/* Kernel symbol used by icache_is_vpipt(). */
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KVM_NVHE_ALIAS(__icache_flags);
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/* VMID bits set by the KVM VMID allocator */
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KVM_NVHE_ALIAS(kvm_arm_vmid_bits);
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/* Kernel symbols needed for cpus_have_final/const_caps checks. */
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KVM_NVHE_ALIAS(arm64_const_caps_ready);
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KVM_NVHE_ALIAS(cpu_hwcap_keys);
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/* Static keys which are set if a vGIC trap should be handled in hyp. */
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KVM_NVHE_ALIAS(vgic_v2_cpuif_trap);
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KVM_NVHE_ALIAS(vgic_v3_cpuif_trap);
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/* Static key checked in pmr_sync(). */
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#ifdef CONFIG_ARM64_PSEUDO_NMI
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KVM_NVHE_ALIAS(gic_pmr_sync);
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/* Static key checked in GIC_PRIO_IRQOFF. */
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KVM_NVHE_ALIAS(gic_nonsecure_priorities);
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#endif
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/* EL2 exception handling */
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KVM_NVHE_ALIAS(__start___kvm_ex_table);
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KVM_NVHE_ALIAS(__stop___kvm_ex_table);
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/* Array containing bases of nVHE per-CPU memory regions. */
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KVM_NVHE_ALIAS(kvm_arm_hyp_percpu_base);
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/* PMU available static key */
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#ifdef CONFIG_HW_PERF_EVENTS
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KVM_NVHE_ALIAS(kvm_arm_pmu_available);
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#endif
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/* Position-independent library routines */
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KVM_NVHE_ALIAS_HYP(clear_page, __pi_clear_page);
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KVM_NVHE_ALIAS_HYP(copy_page, __pi_copy_page);
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KVM_NVHE_ALIAS_HYP(memcpy, __pi_memcpy);
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KVM_NVHE_ALIAS_HYP(memset, __pi_memset);
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#ifdef CONFIG_KASAN
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KVM_NVHE_ALIAS_HYP(__memcpy, __pi_memcpy);
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KVM_NVHE_ALIAS_HYP(__memset, __pi_memset);
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#endif
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/* Kernel memory sections */
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KVM_NVHE_ALIAS(__start_rodata);
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KVM_NVHE_ALIAS(__end_rodata);
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KVM_NVHE_ALIAS(__bss_start);
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KVM_NVHE_ALIAS(__bss_stop);
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/* Hyp memory sections */
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KVM_NVHE_ALIAS(__hyp_idmap_text_start);
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KVM_NVHE_ALIAS(__hyp_idmap_text_end);
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KVM_NVHE_ALIAS(__hyp_text_start);
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KVM_NVHE_ALIAS(__hyp_text_end);
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KVM_NVHE_ALIAS(__hyp_bss_start);
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KVM_NVHE_ALIAS(__hyp_bss_end);
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KVM_NVHE_ALIAS(__hyp_rodata_start);
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KVM_NVHE_ALIAS(__hyp_rodata_end);
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/* pKVM static key */
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KVM_NVHE_ALIAS(kvm_protected_mode_initialized);
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#endif /* CONFIG_KVM */
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#endif /* __ARM64_KERNEL_IMAGE_VARS_H */
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