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633 lines
15 KiB
633 lines
15 KiB
/*
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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/mm.h>
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#include <linux/proc_fs.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/bootmem.h>
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#include <linux/init.h>
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#include <asm/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 <asm/sections.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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/* An ELF note in memory */
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struct memelfnote
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{
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const char *name;
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int type;
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unsigned int datasz;
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void *data;
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};
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static LIST_HEAD(kclist_head);
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static DEFINE_RWLOCK(kclist_lock);
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static int kcore_need_update = 1;
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void
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kclist_add(struct kcore_list *new, void *addr, size_t size, 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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write_lock(&kclist_lock);
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list_add_tail(&new->list, &kclist_head);
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write_unlock(&kclist_lock);
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}
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static size_t get_kcore_size(int *nphdr, size_t *elf_buflen)
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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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*elf_buflen = sizeof(struct elfhdr) +
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(*nphdr + 2)*sizeof(struct elf_phdr) +
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3 * ((sizeof(struct elf_note)) +
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roundup(sizeof(CORE_STR), 4)) +
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roundup(sizeof(struct elf_prstatus), 4) +
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roundup(sizeof(struct elf_prpsinfo), 4) +
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roundup(sizeof(struct task_struct), 4);
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*elf_buflen = PAGE_ALIGN(*elf_buflen);
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return size + *elf_buflen;
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}
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static void free_kclist_ents(struct list_head *head)
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{
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struct kcore_list *tmp, *pos;
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list_for_each_entry_safe(pos, tmp, head, list) {
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list_del(&pos->list);
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kfree(pos);
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}
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}
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/*
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* Replace all KCORE_RAM/KCORE_VMEMMAP information with passed list.
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*/
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static void __kcore_update_ram(struct list_head *list)
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{
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int nphdr;
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size_t size;
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struct kcore_list *tmp, *pos;
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LIST_HEAD(garbage);
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write_lock(&kclist_lock);
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if (kcore_need_update) {
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list_for_each_entry_safe(pos, tmp, &kclist_head, list) {
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if (pos->type == KCORE_RAM
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|| 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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} else
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list_splice(list, &garbage);
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kcore_need_update = 0;
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proc_root_kcore->size = get_kcore_size(&nphdr, &size);
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write_unlock(&kclist_lock);
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free_kclist_ents(&garbage);
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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_update_ram(void)
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{
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LIST_HEAD(head);
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struct kcore_list *ent;
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int ret = 0;
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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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__kcore_update_ram(&head);
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return ret;
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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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int 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 = ALIGN(end, PAGE_SIZE);
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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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int 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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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((pfn << PAGE_SHIFT));
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ent->size = nr_pages << PAGE_SHIFT;
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/* Sanity check: Can happen in 32bit arch...maybe */
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if (ent->addr < (unsigned long) __va(0))
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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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/* cut when vmalloc() area is higher than direct-map area */
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if (VMALLOC_START > (unsigned long)__va(0)) {
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if (ent->addr > VMALLOC_START)
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goto free_out;
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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_update_ram(void)
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{
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int nid, ret;
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unsigned long end_pfn;
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LIST_HEAD(head);
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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_HIGH_MEMORY) {
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unsigned long node_end;
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node_end = NODE_DATA(nid)->node_start_pfn +
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NODE_DATA(nid)->node_spanned_pages;
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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, &head, kclist_add_private);
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if (ret) {
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free_kclist_ents(&head);
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return -ENOMEM;
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}
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__kcore_update_ram(&head);
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return ret;
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}
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#endif /* CONFIG_HIGHMEM */
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/*****************************************************************************/
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/*
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* determine size of ELF note
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*/
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static int notesize(struct memelfnote *en)
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{
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int sz;
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sz = sizeof(struct elf_note);
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sz += roundup((strlen(en->name) + 1), 4);
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sz += roundup(en->datasz, 4);
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return sz;
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} /* end notesize() */
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/*****************************************************************************/
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/*
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* store a note in the header buffer
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*/
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static char *storenote(struct memelfnote *men, char *bufp)
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{
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struct elf_note en;
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#define DUMP_WRITE(addr,nr) do { memcpy(bufp,addr,nr); bufp += nr; } while(0)
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en.n_namesz = strlen(men->name) + 1;
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en.n_descsz = men->datasz;
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en.n_type = men->type;
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DUMP_WRITE(&en, sizeof(en));
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DUMP_WRITE(men->name, en.n_namesz);
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/* XXX - cast from long long to long to avoid need for libgcc.a */
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bufp = (char*) roundup((unsigned long)bufp,4);
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DUMP_WRITE(men->data, men->datasz);
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bufp = (char*) roundup((unsigned long)bufp,4);
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#undef DUMP_WRITE
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return bufp;
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} /* end storenote() */
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/*
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* store an ELF coredump header in the supplied buffer
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* nphdr is the number of elf_phdr to insert
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*/
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static void elf_kcore_store_hdr(char *bufp, int nphdr, int dataoff)
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{
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struct elf_prstatus prstatus; /* NT_PRSTATUS */
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struct elf_prpsinfo prpsinfo; /* NT_PRPSINFO */
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struct elf_phdr *nhdr, *phdr;
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struct elfhdr *elf;
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struct memelfnote notes[3];
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off_t offset = 0;
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struct kcore_list *m;
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/* setup ELF header */
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elf = (struct elfhdr *) bufp;
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bufp += sizeof(struct elfhdr);
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offset += sizeof(struct elfhdr);
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memcpy(elf->e_ident, ELFMAG, SELFMAG);
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elf->e_ident[EI_CLASS] = ELF_CLASS;
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elf->e_ident[EI_DATA] = ELF_DATA;
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elf->e_ident[EI_VERSION]= EV_CURRENT;
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elf->e_ident[EI_OSABI] = ELF_OSABI;
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memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
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elf->e_type = ET_CORE;
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elf->e_machine = ELF_ARCH;
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elf->e_version = EV_CURRENT;
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elf->e_entry = 0;
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elf->e_phoff = sizeof(struct elfhdr);
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elf->e_shoff = 0;
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elf->e_flags = ELF_CORE_EFLAGS;
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elf->e_ehsize = sizeof(struct elfhdr);
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elf->e_phentsize= sizeof(struct elf_phdr);
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elf->e_phnum = nphdr;
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elf->e_shentsize= 0;
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elf->e_shnum = 0;
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elf->e_shstrndx = 0;
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/* setup ELF PT_NOTE program header */
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nhdr = (struct elf_phdr *) bufp;
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bufp += sizeof(struct elf_phdr);
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offset += sizeof(struct elf_phdr);
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nhdr->p_type = PT_NOTE;
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nhdr->p_offset = 0;
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nhdr->p_vaddr = 0;
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nhdr->p_paddr = 0;
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nhdr->p_filesz = 0;
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nhdr->p_memsz = 0;
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nhdr->p_flags = 0;
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nhdr->p_align = 0;
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/* setup ELF PT_LOAD program header for every area */
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list_for_each_entry(m, &kclist_head, list) {
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phdr = (struct elf_phdr *) bufp;
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bufp += sizeof(struct elf_phdr);
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offset += sizeof(struct elf_phdr);
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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) + dataoff;
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phdr->p_vaddr = (size_t)m->addr;
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phdr->p_paddr = 0;
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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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}
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/*
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* Set up the notes in similar form to SVR4 core dumps made
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* with info from their /proc.
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*/
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nhdr->p_offset = offset;
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/* set up the process status */
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notes[0].name = CORE_STR;
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notes[0].type = NT_PRSTATUS;
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notes[0].datasz = sizeof(struct elf_prstatus);
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notes[0].data = &prstatus;
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memset(&prstatus, 0, sizeof(struct elf_prstatus));
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nhdr->p_filesz = notesize(¬es[0]);
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bufp = storenote(¬es[0], bufp);
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/* set up the process info */
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notes[1].name = CORE_STR;
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notes[1].type = NT_PRPSINFO;
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notes[1].datasz = sizeof(struct elf_prpsinfo);
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notes[1].data = &prpsinfo;
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memset(&prpsinfo, 0, sizeof(struct elf_prpsinfo));
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prpsinfo.pr_state = 0;
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prpsinfo.pr_sname = 'R';
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prpsinfo.pr_zomb = 0;
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strcpy(prpsinfo.pr_fname, "vmlinux");
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strncpy(prpsinfo.pr_psargs, saved_command_line, ELF_PRARGSZ);
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nhdr->p_filesz += notesize(¬es[1]);
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bufp = storenote(¬es[1], bufp);
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/* set up the task structure */
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notes[2].name = CORE_STR;
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notes[2].type = NT_TASKSTRUCT;
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notes[2].datasz = sizeof(struct task_struct);
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notes[2].data = current;
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nhdr->p_filesz += notesize(¬es[2]);
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bufp = storenote(¬es[2], bufp);
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} /* end elf_kcore_store_hdr() */
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/*****************************************************************************/
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/*
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* read from the ELF header and then kernel memory
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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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ssize_t acc = 0;
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size_t size, tsz;
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size_t elf_buflen;
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int nphdr;
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unsigned long start;
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read_lock(&kclist_lock);
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size = get_kcore_size(&nphdr, &elf_buflen);
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if (buflen == 0 || *fpos >= size) {
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read_unlock(&kclist_lock);
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return 0;
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}
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/* trim buflen to not go beyond EOF */
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if (buflen > size - *fpos)
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buflen = size - *fpos;
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/* construct an ELF core header if we'll need some of it */
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if (*fpos < elf_buflen) {
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char * elf_buf;
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tsz = elf_buflen - *fpos;
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if (buflen < tsz)
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tsz = buflen;
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elf_buf = kzalloc(elf_buflen, GFP_ATOMIC);
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if (!elf_buf) {
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read_unlock(&kclist_lock);
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return -ENOMEM;
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}
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elf_kcore_store_hdr(elf_buf, nphdr, elf_buflen);
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read_unlock(&kclist_lock);
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if (copy_to_user(buffer, elf_buf + *fpos, tsz)) {
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kfree(elf_buf);
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return -EFAULT;
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}
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kfree(elf_buf);
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buflen -= tsz;
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*fpos += tsz;
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buffer += tsz;
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acc += tsz;
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/* leave now if filled buffer already */
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if (buflen == 0)
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return acc;
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} else
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read_unlock(&kclist_lock);
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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 - elf_buflen);
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if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
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tsz = buflen;
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while (buflen) {
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struct kcore_list *m;
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read_lock(&kclist_lock);
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list_for_each_entry(m, &kclist_head, list) {
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if (start >= m->addr && start < (m->addr+m->size))
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break;
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}
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read_unlock(&kclist_lock);
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if (m == NULL) {
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if (clear_user(buffer, tsz))
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return -EFAULT;
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} else if (is_vmalloc_or_module_addr((void *)start)) {
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char * elf_buf;
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elf_buf = kzalloc(tsz, GFP_KERNEL);
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if (!elf_buf)
|
|
return -ENOMEM;
|
|
vread(elf_buf, (char *)start, tsz);
|
|
/* we have to zero-fill user buffer even if no read */
|
|
if (copy_to_user(buffer, elf_buf, tsz)) {
|
|
kfree(elf_buf);
|
|
return -EFAULT;
|
|
}
|
|
kfree(elf_buf);
|
|
} else {
|
|
if (kern_addr_valid(start)) {
|
|
unsigned long n;
|
|
|
|
n = copy_to_user(buffer, (char *)start, tsz);
|
|
/*
|
|
* We cannot distingush between fault on source
|
|
* and fault on destination. When this happens
|
|
* we clear too and hope it will trigger the
|
|
* EFAULT again.
|
|
*/
|
|
if (n) {
|
|
if (clear_user(buffer + tsz - n,
|
|
n))
|
|
return -EFAULT;
|
|
}
|
|
} else {
|
|
if (clear_user(buffer, tsz))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
buflen -= tsz;
|
|
*fpos += tsz;
|
|
buffer += tsz;
|
|
acc += tsz;
|
|
start += tsz;
|
|
tsz = (buflen > PAGE_SIZE ? PAGE_SIZE : buflen);
|
|
}
|
|
|
|
return acc;
|
|
}
|
|
|
|
|
|
static int open_kcore(struct inode *inode, struct file *filp)
|
|
{
|
|
if (!capable(CAP_SYS_RAWIO))
|
|
return -EPERM;
|
|
if (kcore_need_update)
|
|
kcore_update_ram();
|
|
if (i_size_read(inode) != proc_root_kcore->size) {
|
|
mutex_lock(&inode->i_mutex);
|
|
i_size_write(inode, proc_root_kcore->size);
|
|
mutex_unlock(&inode->i_mutex);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static const struct file_operations proc_kcore_operations = {
|
|
.read = read_kcore,
|
|
.open = open_kcore,
|
|
};
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
/* 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:
|
|
write_lock(&kclist_lock);
|
|
kcore_need_update = 1;
|
|
write_unlock(&kclist_lock);
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
#endif
|
|
|
|
|
|
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, _stext, _end - _stext, 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.
|
|
*/
|
|
struct kcore_list kcore_modules;
|
|
static void __init add_modules_range(void)
|
|
{
|
|
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,
|
|
&proc_kcore_operations);
|
|
if (!proc_root_kcore) {
|
|
printk(KERN_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, 0);
|
|
|
|
return 0;
|
|
}
|
|
module_init(proc_kcore_init);
|
|
|