522 lines
14 KiB
C
522 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_KEXEC_H
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#define LINUX_KEXEC_H
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#define IND_DESTINATION_BIT 0
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#define IND_INDIRECTION_BIT 1
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#define IND_DONE_BIT 2
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#define IND_SOURCE_BIT 3
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#define IND_DESTINATION (1 << IND_DESTINATION_BIT)
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#define IND_INDIRECTION (1 << IND_INDIRECTION_BIT)
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#define IND_DONE (1 << IND_DONE_BIT)
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#define IND_SOURCE (1 << IND_SOURCE_BIT)
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#define IND_FLAGS (IND_DESTINATION | IND_INDIRECTION | IND_DONE | IND_SOURCE)
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#if !defined(__ASSEMBLY__)
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#include <linux/crash_core.h>
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#include <asm/io.h>
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#include <uapi/linux/kexec.h>
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#include <linux/verification.h>
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/* Location of a reserved region to hold the crash kernel.
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*/
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extern struct resource crashk_res;
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extern struct resource crashk_low_res;
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extern note_buf_t __percpu *crash_notes;
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#ifdef CONFIG_KEXEC_CORE
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#include <linux/list.h>
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#include <linux/compat.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <asm/kexec.h>
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/* Verify architecture specific macros are defined */
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#ifndef KEXEC_SOURCE_MEMORY_LIMIT
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#error KEXEC_SOURCE_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
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#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_CONTROL_MEMORY_LIMIT
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#error KEXEC_CONTROL_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_CONTROL_MEMORY_GFP
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#define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY)
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#endif
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#ifndef KEXEC_CONTROL_PAGE_SIZE
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#error KEXEC_CONTROL_PAGE_SIZE not defined
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#endif
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#ifndef KEXEC_ARCH
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#error KEXEC_ARCH not defined
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#endif
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#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
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#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
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#endif
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#ifndef KEXEC_CRASH_MEM_ALIGN
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#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
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#endif
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#define KEXEC_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME
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/*
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* This structure is used to hold the arguments that are used when loading
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* kernel binaries.
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*/
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typedef unsigned long kimage_entry_t;
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struct kexec_segment {
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/*
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* This pointer can point to user memory if kexec_load() system
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* call is used or will point to kernel memory if
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* kexec_file_load() system call is used.
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*
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* Use ->buf when expecting to deal with user memory and use ->kbuf
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* when expecting to deal with kernel memory.
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*/
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union {
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void __user *buf;
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void *kbuf;
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};
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size_t bufsz;
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unsigned long mem;
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size_t memsz;
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};
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#ifdef CONFIG_COMPAT
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struct compat_kexec_segment {
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compat_uptr_t buf;
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compat_size_t bufsz;
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compat_ulong_t mem; /* User space sees this as a (void *) ... */
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compat_size_t memsz;
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};
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#endif
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#ifdef CONFIG_KEXEC_FILE
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struct purgatory_info {
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/*
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* Pointer to elf header at the beginning of kexec_purgatory.
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* Note: kexec_purgatory is read only
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*/
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const Elf_Ehdr *ehdr;
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/*
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* Temporary, modifiable buffer for sechdrs used for relocation.
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* This memory can be freed post image load.
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*/
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Elf_Shdr *sechdrs;
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/*
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* Temporary, modifiable buffer for stripped purgatory used for
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* relocation. This memory can be freed post image load.
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*/
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void *purgatory_buf;
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};
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struct kimage;
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typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
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typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf,
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unsigned long kernel_len, char *initrd,
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unsigned long initrd_len, char *cmdline,
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unsigned long cmdline_len);
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typedef int (kexec_cleanup_t)(void *loader_data);
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#ifdef CONFIG_KEXEC_SIG
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typedef int (kexec_verify_sig_t)(const char *kernel_buf,
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unsigned long kernel_len);
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#endif
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struct kexec_file_ops {
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kexec_probe_t *probe;
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kexec_load_t *load;
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kexec_cleanup_t *cleanup;
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#ifdef CONFIG_KEXEC_SIG
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kexec_verify_sig_t *verify_sig;
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#endif
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};
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extern const struct kexec_file_ops * const kexec_file_loaders[];
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int kexec_image_probe_default(struct kimage *image, void *buf,
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unsigned long buf_len);
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int kexec_image_post_load_cleanup_default(struct kimage *image);
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/*
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* If kexec_buf.mem is set to this value, kexec_locate_mem_hole()
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* will try to allocate free memory. Arch may overwrite it.
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*/
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#ifndef KEXEC_BUF_MEM_UNKNOWN
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#define KEXEC_BUF_MEM_UNKNOWN 0
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#endif
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/**
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* struct kexec_buf - parameters for finding a place for a buffer in memory
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* @image: kexec image in which memory to search.
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* @buffer: Contents which will be copied to the allocated memory.
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* @bufsz: Size of @buffer.
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* @mem: On return will have address of the buffer in memory.
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* @memsz: Size for the buffer in memory.
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* @buf_align: Minimum alignment needed.
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* @buf_min: The buffer can't be placed below this address.
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* @buf_max: The buffer can't be placed above this address.
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* @top_down: Allocate from top of memory.
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*/
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struct kexec_buf {
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struct kimage *image;
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void *buffer;
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unsigned long bufsz;
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unsigned long mem;
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unsigned long memsz;
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unsigned long buf_align;
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unsigned long buf_min;
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unsigned long buf_max;
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bool top_down;
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};
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int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf);
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int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
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void *buf, unsigned int size,
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bool get_value);
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void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name);
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void *kexec_image_load_default(struct kimage *image);
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#ifndef arch_kexec_kernel_image_probe
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static inline int
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arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len)
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{
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return kexec_image_probe_default(image, buf, buf_len);
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}
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#endif
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#ifndef arch_kimage_file_post_load_cleanup
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static inline int arch_kimage_file_post_load_cleanup(struct kimage *image)
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{
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return kexec_image_post_load_cleanup_default(image);
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}
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#endif
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#ifndef arch_kexec_kernel_image_load
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static inline void *arch_kexec_kernel_image_load(struct kimage *image)
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{
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return kexec_image_load_default(image);
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}
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#endif
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#ifdef CONFIG_KEXEC_SIG
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#ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
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int kexec_kernel_verify_pe_sig(const char *kernel, unsigned long kernel_len);
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#endif
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#endif
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extern int kexec_add_buffer(struct kexec_buf *kbuf);
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int kexec_locate_mem_hole(struct kexec_buf *kbuf);
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#ifndef arch_kexec_locate_mem_hole
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/**
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* arch_kexec_locate_mem_hole - Find free memory to place the segments.
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* @kbuf: Parameters for the memory search.
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*
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* On success, kbuf->mem will have the start address of the memory region found.
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*
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* Return: 0 on success, negative errno on error.
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*/
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static inline int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf)
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{
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return kexec_locate_mem_hole(kbuf);
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}
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#endif
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/* Alignment required for elf header segment */
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#define ELF_CORE_HEADER_ALIGN 4096
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struct crash_mem_range {
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u64 start, end;
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};
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struct crash_mem {
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unsigned int max_nr_ranges;
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unsigned int nr_ranges;
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struct crash_mem_range ranges[];
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};
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extern int crash_exclude_mem_range(struct crash_mem *mem,
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unsigned long long mstart,
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unsigned long long mend);
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extern int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
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void **addr, unsigned long *sz);
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#ifndef arch_kexec_apply_relocations_add
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/*
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* arch_kexec_apply_relocations_add - apply relocations of type RELA
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* @pi: Purgatory to be relocated.
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* @section: Section relocations applying to.
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* @relsec: Section containing RELAs.
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* @symtab: Corresponding symtab.
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*
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* Return: 0 on success, negative errno on error.
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*/
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static inline int
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arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *section,
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const Elf_Shdr *relsec, const Elf_Shdr *symtab)
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{
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pr_err("RELA relocation unsupported.\n");
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return -ENOEXEC;
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}
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#endif
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#ifndef arch_kexec_apply_relocations
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/*
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* arch_kexec_apply_relocations - apply relocations of type REL
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* @pi: Purgatory to be relocated.
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* @section: Section relocations applying to.
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* @relsec: Section containing RELs.
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* @symtab: Corresponding symtab.
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*
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* Return: 0 on success, negative errno on error.
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*/
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static inline int
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arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section,
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const Elf_Shdr *relsec, const Elf_Shdr *symtab)
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{
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pr_err("REL relocation unsupported.\n");
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return -ENOEXEC;
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}
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#endif
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#endif /* CONFIG_KEXEC_FILE */
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#ifdef CONFIG_KEXEC_ELF
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struct kexec_elf_info {
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/*
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* Where the ELF binary contents are kept.
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* Memory managed by the user of the struct.
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*/
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const char *buffer;
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const struct elfhdr *ehdr;
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const struct elf_phdr *proghdrs;
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};
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int kexec_build_elf_info(const char *buf, size_t len, struct elfhdr *ehdr,
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struct kexec_elf_info *elf_info);
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int kexec_elf_load(struct kimage *image, struct elfhdr *ehdr,
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struct kexec_elf_info *elf_info,
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struct kexec_buf *kbuf,
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unsigned long *lowest_load_addr);
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void kexec_free_elf_info(struct kexec_elf_info *elf_info);
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int kexec_elf_probe(const char *buf, unsigned long len);
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#endif
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struct kimage {
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kimage_entry_t head;
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kimage_entry_t *entry;
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kimage_entry_t *last_entry;
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unsigned long start;
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struct page *control_code_page;
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struct page *swap_page;
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void *vmcoreinfo_data_copy; /* locates in the crash memory */
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unsigned long nr_segments;
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struct kexec_segment segment[KEXEC_SEGMENT_MAX];
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struct list_head control_pages;
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struct list_head dest_pages;
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struct list_head unusable_pages;
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/* Address of next control page to allocate for crash kernels. */
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unsigned long control_page;
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/* Flags to indicate special processing */
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unsigned int type : 1;
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#define KEXEC_TYPE_DEFAULT 0
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#define KEXEC_TYPE_CRASH 1
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unsigned int preserve_context : 1;
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/* If set, we are using file mode kexec syscall */
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unsigned int file_mode:1;
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#ifdef ARCH_HAS_KIMAGE_ARCH
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struct kimage_arch arch;
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#endif
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#ifdef CONFIG_KEXEC_FILE
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/* Additional fields for file based kexec syscall */
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void *kernel_buf;
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unsigned long kernel_buf_len;
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void *initrd_buf;
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unsigned long initrd_buf_len;
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char *cmdline_buf;
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unsigned long cmdline_buf_len;
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/* File operations provided by image loader */
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const struct kexec_file_ops *fops;
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/* Image loader handling the kernel can store a pointer here */
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void *image_loader_data;
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/* Information for loading purgatory */
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struct purgatory_info purgatory_info;
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#endif
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#ifdef CONFIG_IMA_KEXEC
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/* Virtual address of IMA measurement buffer for kexec syscall */
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void *ima_buffer;
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phys_addr_t ima_buffer_addr;
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size_t ima_buffer_size;
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#endif
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/* Core ELF header buffer */
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void *elf_headers;
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unsigned long elf_headers_sz;
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unsigned long elf_load_addr;
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};
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/* kexec interface functions */
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extern void machine_kexec(struct kimage *image);
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extern int machine_kexec_prepare(struct kimage *image);
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extern void machine_kexec_cleanup(struct kimage *image);
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extern int kernel_kexec(void);
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extern struct page *kimage_alloc_control_pages(struct kimage *image,
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unsigned int order);
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#ifndef machine_kexec_post_load
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static inline int machine_kexec_post_load(struct kimage *image) { return 0; }
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#endif
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extern void __crash_kexec(struct pt_regs *);
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extern void crash_kexec(struct pt_regs *);
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int kexec_should_crash(struct task_struct *);
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int kexec_crash_loaded(void);
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void crash_save_cpu(struct pt_regs *regs, int cpu);
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extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);
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extern struct kimage *kexec_image;
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extern struct kimage *kexec_crash_image;
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extern int kexec_load_disabled;
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#ifndef kexec_flush_icache_page
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#define kexec_flush_icache_page(page)
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#endif
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/* List of defined/legal kexec flags */
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#ifndef CONFIG_KEXEC_JUMP
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#define KEXEC_FLAGS KEXEC_ON_CRASH
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#else
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#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
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#endif
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/* List of defined/legal kexec file flags */
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#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
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KEXEC_FILE_NO_INITRAMFS)
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/* flag to track if kexec reboot is in progress */
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extern bool kexec_in_progress;
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int crash_shrink_memory(unsigned long new_size);
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ssize_t crash_get_memory_size(void);
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#ifndef arch_kexec_protect_crashkres
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/*
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* Protection mechanism for crashkernel reserved memory after
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* the kdump kernel is loaded.
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*
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* Provide an empty default implementation here -- architecture
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* code may override this
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*/
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static inline void arch_kexec_protect_crashkres(void) { }
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#endif
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#ifndef arch_kexec_unprotect_crashkres
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static inline void arch_kexec_unprotect_crashkres(void) { }
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#endif
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#ifndef page_to_boot_pfn
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static inline unsigned long page_to_boot_pfn(struct page *page)
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{
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return page_to_pfn(page);
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}
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#endif
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#ifndef boot_pfn_to_page
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static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
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{
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return pfn_to_page(boot_pfn);
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}
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#endif
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#ifndef phys_to_boot_phys
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static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
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{
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return phys;
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}
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#endif
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#ifndef boot_phys_to_phys
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static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
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{
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return boot_phys;
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}
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#endif
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#ifndef crash_free_reserved_phys_range
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static inline void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
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{
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unsigned long addr;
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for (addr = begin; addr < end; addr += PAGE_SIZE)
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free_reserved_page(boot_pfn_to_page(addr >> PAGE_SHIFT));
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}
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#endif
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static inline unsigned long virt_to_boot_phys(void *addr)
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{
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return phys_to_boot_phys(__pa((unsigned long)addr));
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}
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static inline void *boot_phys_to_virt(unsigned long entry)
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{
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return phys_to_virt(boot_phys_to_phys(entry));
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}
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#ifndef arch_kexec_post_alloc_pages
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static inline int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp) { return 0; }
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#endif
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#ifndef arch_kexec_pre_free_pages
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static inline void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) { }
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#endif
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#else /* !CONFIG_KEXEC_CORE */
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struct pt_regs;
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struct task_struct;
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static inline void __crash_kexec(struct pt_regs *regs) { }
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static inline void crash_kexec(struct pt_regs *regs) { }
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static inline int kexec_should_crash(struct task_struct *p) { return 0; }
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static inline int kexec_crash_loaded(void) { return 0; }
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#define kexec_in_progress false
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#endif /* CONFIG_KEXEC_CORE */
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#ifdef CONFIG_KEXEC_SIG
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void set_kexec_sig_enforced(void);
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#else
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static inline void set_kexec_sig_enforced(void) {}
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#endif
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#endif /* !defined(__ASSEBMLY__) */
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#endif /* LINUX_KEXEC_H */
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