689 строки
16 KiB
C
689 строки
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* fs/proc/kcore.c kernel ELF core dumper
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*
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* Modelled on fs/exec.c:aout_core_dump()
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* Jeremy Fitzhardinge <jeremy@sw.oz.au>
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* ELF version written by David Howells <David.Howells@nexor.co.uk>
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* Modified and incorporated into 2.3.x by Tigran Aivazian <tigran@veritas.com>
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* Support to dump vmalloc'd areas (ELF only), Tigran Aivazian <tigran@veritas.com>
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* Safe accesses to vmalloc/direct-mapped discontiguous areas, Kanoj Sarcar <kanoj@sgi.com>
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*/
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#include <linux/crash_core.h>
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#include <linux/mm.h>
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#include <linux/proc_fs.h>
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#include <linux/kcore.h>
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#include <linux/user.h>
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#include <linux/capability.h>
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#include <linux/elf.h>
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#include <linux/elfcore.h>
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#include <linux/vmalloc.h>
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#include <linux/highmem.h>
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#include <linux/printk.h>
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#include <linux/memblock.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <asm/io.h>
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#include <linux/list.h>
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#include <linux/ioport.h>
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#include <linux/memory.h>
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#include <linux/sched/task.h>
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#include <linux/security.h>
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#include <asm/sections.h>
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#include "internal.h"
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#define CORE_STR "CORE"
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#ifndef ELF_CORE_EFLAGS
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#define ELF_CORE_EFLAGS 0
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#endif
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static struct proc_dir_entry *proc_root_kcore;
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#ifndef kc_vaddr_to_offset
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#define kc_vaddr_to_offset(v) ((v) - PAGE_OFFSET)
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#endif
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#ifndef kc_offset_to_vaddr
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#define kc_offset_to_vaddr(o) ((o) + PAGE_OFFSET)
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#endif
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static LIST_HEAD(kclist_head);
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static DECLARE_RWSEM(kclist_lock);
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static int kcore_need_update = 1;
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/*
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* Returns > 0 for RAM pages, 0 for non-RAM pages, < 0 on error
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* Same as oldmem_pfn_is_ram in vmcore
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*/
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static int (*mem_pfn_is_ram)(unsigned long pfn);
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int __init register_mem_pfn_is_ram(int (*fn)(unsigned long pfn))
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{
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if (mem_pfn_is_ram)
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return -EBUSY;
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mem_pfn_is_ram = fn;
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return 0;
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}
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static int pfn_is_ram(unsigned long pfn)
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{
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if (mem_pfn_is_ram)
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return mem_pfn_is_ram(pfn);
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else
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return 1;
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}
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/* This doesn't grab kclist_lock, so it should only be used at init time. */
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void __init kclist_add(struct kcore_list *new, void *addr, size_t size,
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int type)
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{
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new->addr = (unsigned long)addr;
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new->size = size;
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new->type = type;
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list_add_tail(&new->list, &kclist_head);
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}
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static size_t get_kcore_size(int *nphdr, size_t *phdrs_len, size_t *notes_len,
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size_t *data_offset)
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{
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size_t try, size;
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struct kcore_list *m;
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*nphdr = 1; /* PT_NOTE */
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size = 0;
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list_for_each_entry(m, &kclist_head, list) {
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try = kc_vaddr_to_offset((size_t)m->addr + m->size);
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if (try > size)
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size = try;
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*nphdr = *nphdr + 1;
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}
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*phdrs_len = *nphdr * sizeof(struct elf_phdr);
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*notes_len = (4 * sizeof(struct elf_note) +
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3 * ALIGN(sizeof(CORE_STR), 4) +
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VMCOREINFO_NOTE_NAME_BYTES +
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ALIGN(sizeof(struct elf_prstatus), 4) +
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ALIGN(sizeof(struct elf_prpsinfo), 4) +
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ALIGN(arch_task_struct_size, 4) +
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ALIGN(vmcoreinfo_size, 4));
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*data_offset = PAGE_ALIGN(sizeof(struct elfhdr) + *phdrs_len +
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*notes_len);
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return *data_offset + size;
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}
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#ifdef CONFIG_HIGHMEM
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/*
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* If no highmem, we can assume [0...max_low_pfn) continuous range of memory
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* because memory hole is not as big as !HIGHMEM case.
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* (HIGHMEM is special because part of memory is _invisible_ from the kernel.)
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*/
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static int kcore_ram_list(struct list_head *head)
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{
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struct kcore_list *ent;
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ent = kmalloc(sizeof(*ent), GFP_KERNEL);
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if (!ent)
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return -ENOMEM;
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ent->addr = (unsigned long)__va(0);
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ent->size = max_low_pfn << PAGE_SHIFT;
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ent->type = KCORE_RAM;
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list_add(&ent->list, head);
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return 0;
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}
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#else /* !CONFIG_HIGHMEM */
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#ifdef CONFIG_SPARSEMEM_VMEMMAP
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/* calculate vmemmap's address from given system ram pfn and register it */
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static int
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get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head)
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{
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unsigned long pfn = __pa(ent->addr) >> PAGE_SHIFT;
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unsigned long nr_pages = ent->size >> PAGE_SHIFT;
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unsigned long start, end;
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struct kcore_list *vmm, *tmp;
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start = ((unsigned long)pfn_to_page(pfn)) & PAGE_MASK;
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end = ((unsigned long)pfn_to_page(pfn + nr_pages)) - 1;
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end = PAGE_ALIGN(end);
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/* overlap check (because we have to align page */
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list_for_each_entry(tmp, head, list) {
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if (tmp->type != KCORE_VMEMMAP)
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continue;
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if (start < tmp->addr + tmp->size)
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if (end > tmp->addr)
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end = tmp->addr;
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}
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if (start < end) {
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vmm = kmalloc(sizeof(*vmm), GFP_KERNEL);
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if (!vmm)
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return 0;
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vmm->addr = start;
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vmm->size = end - start;
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vmm->type = KCORE_VMEMMAP;
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list_add_tail(&vmm->list, head);
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}
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return 1;
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}
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#else
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static int
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get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head)
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{
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return 1;
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}
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#endif
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static int
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kclist_add_private(unsigned long pfn, unsigned long nr_pages, void *arg)
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{
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struct list_head *head = (struct list_head *)arg;
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struct kcore_list *ent;
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struct page *p;
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if (!pfn_valid(pfn))
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return 1;
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p = pfn_to_page(pfn);
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ent = kmalloc(sizeof(*ent), GFP_KERNEL);
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if (!ent)
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return -ENOMEM;
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ent->addr = (unsigned long)page_to_virt(p);
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ent->size = nr_pages << PAGE_SHIFT;
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if (!virt_addr_valid(ent->addr))
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goto free_out;
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/* cut not-mapped area. ....from ppc-32 code. */
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if (ULONG_MAX - ent->addr < ent->size)
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ent->size = ULONG_MAX - ent->addr;
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/*
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* We've already checked virt_addr_valid so we know this address
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* is a valid pointer, therefore we can check against it to determine
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* if we need to trim
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*/
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if (VMALLOC_START > ent->addr) {
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if (VMALLOC_START - ent->addr < ent->size)
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ent->size = VMALLOC_START - ent->addr;
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}
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ent->type = KCORE_RAM;
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list_add_tail(&ent->list, head);
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if (!get_sparsemem_vmemmap_info(ent, head)) {
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list_del(&ent->list);
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goto free_out;
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}
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return 0;
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free_out:
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kfree(ent);
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return 1;
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}
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static int kcore_ram_list(struct list_head *list)
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{
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int nid, ret;
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unsigned long end_pfn;
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/* Not inialized....update now */
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/* find out "max pfn" */
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end_pfn = 0;
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for_each_node_state(nid, N_MEMORY) {
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unsigned long node_end;
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node_end = node_end_pfn(nid);
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if (end_pfn < node_end)
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end_pfn = node_end;
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}
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/* scan 0 to max_pfn */
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ret = walk_system_ram_range(0, end_pfn, list, kclist_add_private);
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if (ret)
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return -ENOMEM;
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return 0;
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}
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#endif /* CONFIG_HIGHMEM */
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static int kcore_update_ram(void)
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{
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LIST_HEAD(list);
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LIST_HEAD(garbage);
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int nphdr;
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size_t phdrs_len, notes_len, data_offset;
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struct kcore_list *tmp, *pos;
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int ret = 0;
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down_write(&kclist_lock);
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if (!xchg(&kcore_need_update, 0))
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goto out;
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ret = kcore_ram_list(&list);
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if (ret) {
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/* Couldn't get the RAM list, try again next time. */
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WRITE_ONCE(kcore_need_update, 1);
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list_splice_tail(&list, &garbage);
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goto out;
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}
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list_for_each_entry_safe(pos, tmp, &kclist_head, list) {
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if (pos->type == KCORE_RAM || pos->type == KCORE_VMEMMAP)
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list_move(&pos->list, &garbage);
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}
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list_splice_tail(&list, &kclist_head);
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proc_root_kcore->size = get_kcore_size(&nphdr, &phdrs_len, ¬es_len,
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&data_offset);
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out:
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up_write(&kclist_lock);
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list_for_each_entry_safe(pos, tmp, &garbage, list) {
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list_del(&pos->list);
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kfree(pos);
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}
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return ret;
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}
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static void append_kcore_note(char *notes, size_t *i, const char *name,
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unsigned int type, const void *desc,
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size_t descsz)
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{
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struct elf_note *note = (struct elf_note *)¬es[*i];
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note->n_namesz = strlen(name) + 1;
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note->n_descsz = descsz;
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note->n_type = type;
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*i += sizeof(*note);
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memcpy(¬es[*i], name, note->n_namesz);
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*i = ALIGN(*i + note->n_namesz, 4);
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memcpy(¬es[*i], desc, descsz);
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*i = ALIGN(*i + descsz, 4);
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}
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static ssize_t
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read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
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{
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char *buf = file->private_data;
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size_t phdrs_offset, notes_offset, data_offset;
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size_t page_offline_frozen = 1;
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size_t phdrs_len, notes_len;
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struct kcore_list *m;
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size_t tsz;
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int nphdr;
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unsigned long start;
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size_t orig_buflen = buflen;
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int ret = 0;
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down_read(&kclist_lock);
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/*
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* Don't race against drivers that set PageOffline() and expect no
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* further page access.
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*/
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page_offline_freeze();
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get_kcore_size(&nphdr, &phdrs_len, ¬es_len, &data_offset);
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phdrs_offset = sizeof(struct elfhdr);
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notes_offset = phdrs_offset + phdrs_len;
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/* ELF file header. */
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if (buflen && *fpos < sizeof(struct elfhdr)) {
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struct elfhdr ehdr = {
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.e_ident = {
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[EI_MAG0] = ELFMAG0,
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[EI_MAG1] = ELFMAG1,
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[EI_MAG2] = ELFMAG2,
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[EI_MAG3] = ELFMAG3,
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[EI_CLASS] = ELF_CLASS,
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[EI_DATA] = ELF_DATA,
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[EI_VERSION] = EV_CURRENT,
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[EI_OSABI] = ELF_OSABI,
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},
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.e_type = ET_CORE,
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.e_machine = ELF_ARCH,
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.e_version = EV_CURRENT,
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.e_phoff = sizeof(struct elfhdr),
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.e_flags = ELF_CORE_EFLAGS,
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.e_ehsize = sizeof(struct elfhdr),
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.e_phentsize = sizeof(struct elf_phdr),
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.e_phnum = nphdr,
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};
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tsz = min_t(size_t, buflen, sizeof(struct elfhdr) - *fpos);
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if (copy_to_user(buffer, (char *)&ehdr + *fpos, tsz)) {
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ret = -EFAULT;
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goto out;
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}
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buffer += tsz;
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buflen -= tsz;
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*fpos += tsz;
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}
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/* ELF program headers. */
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if (buflen && *fpos < phdrs_offset + phdrs_len) {
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struct elf_phdr *phdrs, *phdr;
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phdrs = kzalloc(phdrs_len, GFP_KERNEL);
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if (!phdrs) {
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ret = -ENOMEM;
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goto out;
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}
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phdrs[0].p_type = PT_NOTE;
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phdrs[0].p_offset = notes_offset;
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phdrs[0].p_filesz = notes_len;
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phdr = &phdrs[1];
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list_for_each_entry(m, &kclist_head, list) {
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phdr->p_type = PT_LOAD;
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phdr->p_flags = PF_R | PF_W | PF_X;
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phdr->p_offset = kc_vaddr_to_offset(m->addr) + data_offset;
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phdr->p_vaddr = (size_t)m->addr;
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if (m->type == KCORE_RAM)
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phdr->p_paddr = __pa(m->addr);
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else if (m->type == KCORE_TEXT)
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phdr->p_paddr = __pa_symbol(m->addr);
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else
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phdr->p_paddr = (elf_addr_t)-1;
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phdr->p_filesz = phdr->p_memsz = m->size;
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phdr->p_align = PAGE_SIZE;
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phdr++;
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}
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tsz = min_t(size_t, buflen, phdrs_offset + phdrs_len - *fpos);
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if (copy_to_user(buffer, (char *)phdrs + *fpos - phdrs_offset,
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tsz)) {
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kfree(phdrs);
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ret = -EFAULT;
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goto out;
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}
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kfree(phdrs);
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buffer += tsz;
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buflen -= tsz;
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*fpos += tsz;
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}
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/* ELF note segment. */
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if (buflen && *fpos < notes_offset + notes_len) {
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struct elf_prstatus prstatus = {};
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struct elf_prpsinfo prpsinfo = {
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.pr_sname = 'R',
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.pr_fname = "vmlinux",
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};
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char *notes;
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size_t i = 0;
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strlcpy(prpsinfo.pr_psargs, saved_command_line,
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sizeof(prpsinfo.pr_psargs));
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notes = kzalloc(notes_len, GFP_KERNEL);
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if (!notes) {
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ret = -ENOMEM;
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goto out;
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}
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append_kcore_note(notes, &i, CORE_STR, NT_PRSTATUS, &prstatus,
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sizeof(prstatus));
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append_kcore_note(notes, &i, CORE_STR, NT_PRPSINFO, &prpsinfo,
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sizeof(prpsinfo));
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append_kcore_note(notes, &i, CORE_STR, NT_TASKSTRUCT, current,
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arch_task_struct_size);
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/*
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* vmcoreinfo_size is mostly constant after init time, but it
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* can be changed by crash_save_vmcoreinfo(). Racing here with a
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* panic on another CPU before the machine goes down is insanely
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* unlikely, but it's better to not leave potential buffer
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* overflows lying around, regardless.
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*/
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append_kcore_note(notes, &i, VMCOREINFO_NOTE_NAME, 0,
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vmcoreinfo_data,
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min(vmcoreinfo_size, notes_len - i));
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tsz = min_t(size_t, buflen, notes_offset + notes_len - *fpos);
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if (copy_to_user(buffer, notes + *fpos - notes_offset, tsz)) {
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kfree(notes);
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ret = -EFAULT;
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goto out;
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}
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kfree(notes);
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buffer += tsz;
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buflen -= tsz;
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*fpos += tsz;
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}
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/*
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* Check to see if our file offset matches with any of
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* the addresses in the elf_phdr on our list.
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*/
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start = kc_offset_to_vaddr(*fpos - data_offset);
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if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
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tsz = buflen;
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m = NULL;
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while (buflen) {
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struct page *page;
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unsigned long pfn;
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/*
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* If this is the first iteration or the address is not within
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* the previous entry, search for a matching entry.
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*/
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if (!m || start < m->addr || start >= m->addr + m->size) {
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struct kcore_list *iter;
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m = NULL;
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list_for_each_entry(iter, &kclist_head, list) {
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if (start >= iter->addr &&
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start < iter->addr + iter->size) {
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m = iter;
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break;
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}
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}
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}
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if (page_offline_frozen++ % MAX_ORDER_NR_PAGES == 0) {
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page_offline_thaw();
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cond_resched();
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page_offline_freeze();
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}
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if (!m) {
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if (clear_user(buffer, tsz)) {
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ret = -EFAULT;
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|
goto out;
|
|
}
|
|
goto skip;
|
|
}
|
|
|
|
switch (m->type) {
|
|
case KCORE_VMALLOC:
|
|
vread(buf, (char *)start, tsz);
|
|
/* we have to zero-fill user buffer even if no read */
|
|
if (copy_to_user(buffer, buf, tsz)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
break;
|
|
case KCORE_USER:
|
|
/* User page is handled prior to normal kernel page: */
|
|
if (copy_to_user(buffer, (char *)start, tsz)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
break;
|
|
case KCORE_RAM:
|
|
pfn = __pa(start) >> PAGE_SHIFT;
|
|
page = pfn_to_online_page(pfn);
|
|
|
|
/*
|
|
* Don't read offline sections, logically offline pages
|
|
* (e.g., inflated in a balloon), hwpoisoned pages,
|
|
* and explicitly excluded physical ranges.
|
|
*/
|
|
if (!page || PageOffline(page) ||
|
|
is_page_hwpoison(page) || !pfn_is_ram(pfn)) {
|
|
if (clear_user(buffer, tsz)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
break;
|
|
}
|
|
fallthrough;
|
|
case KCORE_VMEMMAP:
|
|
case KCORE_TEXT:
|
|
/*
|
|
* Using bounce buffer to bypass the
|
|
* hardened user copy kernel text checks.
|
|
*/
|
|
if (copy_from_kernel_nofault(buf, (void *)start, tsz)) {
|
|
if (clear_user(buffer, tsz)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
} else {
|
|
if (copy_to_user(buffer, buf, tsz)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
pr_warn_once("Unhandled KCORE type: %d\n", m->type);
|
|
if (clear_user(buffer, tsz)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
}
|
|
skip:
|
|
buflen -= tsz;
|
|
*fpos += tsz;
|
|
buffer += tsz;
|
|
start += tsz;
|
|
tsz = (buflen > PAGE_SIZE ? PAGE_SIZE : buflen);
|
|
}
|
|
|
|
out:
|
|
page_offline_thaw();
|
|
up_read(&kclist_lock);
|
|
if (ret)
|
|
return ret;
|
|
return orig_buflen - buflen;
|
|
}
|
|
|
|
static int open_kcore(struct inode *inode, struct file *filp)
|
|
{
|
|
int ret = security_locked_down(LOCKDOWN_KCORE);
|
|
|
|
if (!capable(CAP_SYS_RAWIO))
|
|
return -EPERM;
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
filp->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (!filp->private_data)
|
|
return -ENOMEM;
|
|
|
|
if (kcore_need_update)
|
|
kcore_update_ram();
|
|
if (i_size_read(inode) != proc_root_kcore->size) {
|
|
inode_lock(inode);
|
|
i_size_write(inode, proc_root_kcore->size);
|
|
inode_unlock(inode);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int release_kcore(struct inode *inode, struct file *file)
|
|
{
|
|
kfree(file->private_data);
|
|
return 0;
|
|
}
|
|
|
|
static const struct proc_ops kcore_proc_ops = {
|
|
.proc_read = read_kcore,
|
|
.proc_open = open_kcore,
|
|
.proc_release = release_kcore,
|
|
.proc_lseek = default_llseek,
|
|
};
|
|
|
|
/* just remember that we have to update kcore */
|
|
static int __meminit kcore_callback(struct notifier_block *self,
|
|
unsigned long action, void *arg)
|
|
{
|
|
switch (action) {
|
|
case MEM_ONLINE:
|
|
case MEM_OFFLINE:
|
|
kcore_need_update = 1;
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
|
|
static struct kcore_list kcore_vmalloc;
|
|
|
|
#ifdef CONFIG_ARCH_PROC_KCORE_TEXT
|
|
static struct kcore_list kcore_text;
|
|
/*
|
|
* If defined, special segment is used for mapping kernel text instead of
|
|
* direct-map area. We need to create special TEXT section.
|
|
*/
|
|
static void __init proc_kcore_text_init(void)
|
|
{
|
|
kclist_add(&kcore_text, _text, _end - _text, KCORE_TEXT);
|
|
}
|
|
#else
|
|
static void __init proc_kcore_text_init(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_MODULES) && defined(MODULES_VADDR)
|
|
/*
|
|
* MODULES_VADDR has no intersection with VMALLOC_ADDR.
|
|
*/
|
|
static struct kcore_list kcore_modules;
|
|
static void __init add_modules_range(void)
|
|
{
|
|
if (MODULES_VADDR != VMALLOC_START && MODULES_END != VMALLOC_END) {
|
|
kclist_add(&kcore_modules, (void *)MODULES_VADDR,
|
|
MODULES_END - MODULES_VADDR, KCORE_VMALLOC);
|
|
}
|
|
}
|
|
#else
|
|
static void __init add_modules_range(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int __init proc_kcore_init(void)
|
|
{
|
|
proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &kcore_proc_ops);
|
|
if (!proc_root_kcore) {
|
|
pr_err("couldn't create /proc/kcore\n");
|
|
return 0; /* Always returns 0. */
|
|
}
|
|
/* Store text area if it's special */
|
|
proc_kcore_text_init();
|
|
/* Store vmalloc area */
|
|
kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
|
|
VMALLOC_END - VMALLOC_START, KCORE_VMALLOC);
|
|
add_modules_range();
|
|
/* Store direct-map area from physical memory map */
|
|
kcore_update_ram();
|
|
hotplug_memory_notifier(kcore_callback, DEFAULT_CALLBACK_PRI);
|
|
|
|
return 0;
|
|
}
|
|
fs_initcall(proc_kcore_init);
|