/* * fs/proc/kcore.c kernel ELF core dumper * * Modelled on fs/exec.c:aout_core_dump() * Jeremy Fitzhardinge <jeremy@sw.oz.au> * ELF version written by David Howells <David.Howells@nexor.co.uk> * Modified and incorporated into 2.3.x by Tigran Aivazian <tigran@veritas.com> * Support to dump vmalloc'd areas (ELF only), Tigran Aivazian <tigran@veritas.com> * Safe accesses to vmalloc/direct-mapped discontiguous areas, Kanoj Sarcar <kanoj@sgi.com> */ #include <linux/mm.h>#include <linux/proc_fs.h>#include <linux/user.h>#include <linux/capability.h>#include <linux/elf.h>#include <linux/elfcore.h>#include <linux/vmalloc.h>#include <linux/highmem.h>#include <linux/bootmem.h>#include <linux/init.h>#include <linux/slab.h>#include <asm/uaccess.h>#include <asm/io.h>#include <linux/list.h>#include <linux/ioport.h>#include <linux/memory.h>#include <asm/sections.h> #define CORE_STR "CORE" #ifndef ELF_CORE_EFLAGS#define ELF_CORE_EFLAGS 0#endif static struct proc_dir_entry *proc_root_kcore; #ifndef kc_vaddr_to_offset#define kc_vaddr_to_offset(v) ((v) - PAGE_OFFSET)#endif#ifndef kc_offset_to_vaddr#define kc_offset_to_vaddr(o) ((o) + PAGE_OFFSET)#endif /* An ELF note in memory */struct memelfnote{ const char *name; int type; unsigned int datasz; void *data;}; static LIST_HEAD(kclist_head);static DEFINE_RWLOCK(kclist_lock);static int kcore_need_update = 1; voidkclist_add(struct kcore_list *new, void *addr, size_t size, int type){ new->addr = (unsigned long)addr; new->size = size; new->type = type; write_lock(&kclist_lock); list_add_tail(&new->list, &kclist_head); write_unlock(&kclist_lock);} static size_t get_kcore_size(int *nphdr, size_t *elf_buflen){ size_t try, size; struct kcore_list *m; *nphdr = 1; /* PT_NOTE */ size = 0; list_for_each_entry(m, &kclist_head, list) { try = kc_vaddr_to_offset((size_t)m->addr + m->size); if (try > size) size = try; *nphdr = *nphdr + 1; } *elf_buflen = sizeof(struct elfhdr) + (*nphdr + 2)*sizeof(struct elf_phdr) + 3 * ((sizeof(struct elf_note)) + roundup(sizeof(CORE_STR), 4)) + roundup(sizeof(struct elf_prstatus), 4) + roundup(sizeof(struct elf_prpsinfo), 4) + roundup(sizeof(struct task_struct), 4); *elf_buflen = PAGE_ALIGN(*elf_buflen); return size + *elf_buflen;} static void free_kclist_ents(struct list_head *head){ struct kcore_list *tmp, *pos; list_for_each_entry_safe(pos, tmp, head, list) { list_del(&pos->list); kfree(pos); }}/* * Replace all KCORE_RAM/KCORE_VMEMMAP information with passed list. */static void __kcore_update_ram(struct list_head *list){ int nphdr; size_t size; struct kcore_list *tmp, *pos; LIST_HEAD(garbage); write_lock(&kclist_lock); if (kcore_need_update) { list_for_each_entry_safe(pos, tmp, &kclist_head, list) { if (pos->type == KCORE_RAM || pos->type == KCORE_VMEMMAP) list_move(&pos->list, &garbage); } list_splice_tail(list, &kclist_head); } else list_splice(list, &garbage); kcore_need_update = 0; proc_root_kcore->size = get_kcore_size(&nphdr, &size); write_unlock(&kclist_lock); free_kclist_ents(&garbage);} #ifdef CONFIG_HIGHMEM/* * If no highmem, we can assume [0...max_low_pfn) continuous range of memory * because memory hole is not as big as !HIGHMEM case. * (HIGHMEM is special because part of memory is _invisible_ from the kernel.) */static int kcore_update_ram(void){ LIST_HEAD(head); struct kcore_list *ent; int ret = 0; ent = kmalloc(sizeof(*ent), GFP_KERNEL); if (!ent) return -ENOMEM; ent->addr = (unsigned long)__va(0); ent->size = max_low_pfn << PAGE_SHIFT; ent->type = KCORE_RAM; list_add(&ent->list, &head); __kcore_update_ram(&head); return ret;} #else /* !CONFIG_HIGHMEM */ #ifdef CONFIG_SPARSEMEM_VMEMMAP/* calculate vmemmap's address from given system ram pfn and register it */static intget_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head){ unsigned long pfn = __pa(ent->addr) >> PAGE_SHIFT; unsigned long nr_pages = ent->size >> PAGE_SHIFT; unsigned long start, end; struct kcore_list *vmm, *tmp; start = ((unsigned long)pfn_to_page(pfn)) & PAGE_MASK; end = ((unsigned long)pfn_to_page(pfn + nr_pages)) - 1; end = ALIGN(end, PAGE_SIZE); /* overlap check (because we have to align page */ list_for_each_entry(tmp, head, list) { if (tmp->type != KCORE_VMEMMAP) continue; if (start < tmp->addr + tmp->size) if (end > tmp->addr) end = tmp->addr; } if (start < end) { vmm = kmalloc(sizeof(*vmm), GFP_KERNEL); if (!vmm) return 0; vmm->addr = start; vmm->size = end - start; vmm->type = KCORE_VMEMMAP; list_add_tail(&vmm->list, head); } return 1; }#elsestatic intget_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head){ return 1;} #endif static intkclist_add_private(unsigned long pfn, unsigned long nr_pages, void *arg){ struct list_head *head = (struct list_head *)arg; struct kcore_list *ent; ent = kmalloc(sizeof(*ent), GFP_KERNEL); if (!ent) return -ENOMEM; ent->addr = (unsigned long)__va((pfn << PAGE_SHIFT)); ent->size = nr_pages << PAGE_SHIFT; /* Sanity check: Can happen in 32bit arch...maybe */ if (ent->addr < (unsigned long) __va(0)) goto free_out; /* cut not-mapped area. ....from ppc-32 code. */ if (ULONG_MAX - ent->addr < ent->size) ent->size = ULONG_MAX - ent->addr; /* cut when vmalloc() area is higher than direct-map area */ if (VMALLOC_START > (unsigned long)__va(0)) { if (ent->addr > VMALLOC_START) goto free_out; if (VMALLOC_START - ent->addr < ent->size) ent->size = VMALLOC_START - ent->addr; } ent->type = KCORE_RAM; list_add_tail(&ent->list, head); if (!get_sparsemem_vmemmap_info(ent, head)) { list_del(&ent->list); goto free_out; } return 0;free_out: kfree(ent); return 1;} static int kcore_update_ram(void){ int nid, ret; unsigned long end_pfn; LIST_HEAD(head); /* Not inialized....update now */ /* find out "max pfn" */ end_pfn = 0; for_each_node_state(nid, N_HIGH_MEMORY) { unsigned long node_end; node_end = NODE_DATA(nid)->node_start_pfn + NODE_DATA(nid)->node_spanned_pages; if (end_pfn < node_end) end_pfn = node_end; } /* scan 0 to max_pfn */ ret = walk_system_ram_range(0, end_pfn, &head, kclist_add_private); if (ret) { free_kclist_ents(&head); return -ENOMEM; } __kcore_update_ram(&head); return ret;}#endif /* CONFIG_HIGHMEM */ /*****************************************************************************//* * determine size of ELF note */static int notesize(struct memelfnote *en){ int sz; sz = sizeof(struct elf_note); sz += roundup((strlen(en->name) + 1), 4); sz += roundup(en->datasz, 4); return sz;} /* end notesize() */ /*****************************************************************************//* * store a note in the header buffer */static char *storenote(struct memelfnote *men, char *bufp){ struct elf_note en; #define DUMP_WRITE(addr,nr) do { memcpy(bufp,addr,nr); bufp += nr; } while(0) en.n_namesz = strlen(men->name) + 1; en.n_descsz = men->datasz; en.n_type = men->type; DUMP_WRITE(&en, sizeof(en)); DUMP_WRITE(men->name, en.n_namesz); /* XXX - cast from long long to long to avoid need for libgcc.a */ bufp = (char*) roundup((unsigned long)bufp,4); DUMP_WRITE(men->data, men->datasz); bufp = (char*) roundup((unsigned long)bufp,4); #undef DUMP_WRITE return bufp;} /* end storenote() */ /* * store an ELF coredump header in the supplied buffer * nphdr is the number of elf_phdr to insert */static void elf_kcore_store_hdr(char *bufp, int nphdr, int dataoff){ struct elf_prstatus prstatus; /* NT_PRSTATUS */ struct elf_prpsinfo prpsinfo; /* NT_PRPSINFO */ struct elf_phdr *nhdr, *phdr; struct elfhdr *elf; struct memelfnote notes[3]; off_t offset = 0; struct kcore_list *m; /* setup ELF header */ elf = (struct elfhdr *) bufp; bufp += sizeof(struct elfhdr); offset += sizeof(struct elfhdr); memcpy(elf->e_ident, ELFMAG, SELFMAG); elf->e_ident[EI_CLASS] = ELF_CLASS; elf->e_ident[EI_DATA] = ELF_DATA; elf->e_ident[EI_VERSION]= EV_CURRENT; elf->e_ident[EI_OSABI] = ELF_OSABI; memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); elf->e_type = ET_CORE; elf->e_machine = ELF_ARCH; elf->e_version = EV_CURRENT; elf->e_entry = 0; elf->e_phoff = sizeof(struct elfhdr); elf->e_shoff = 0; elf->e_flags = ELF_CORE_EFLAGS; elf->e_ehsize = sizeof(struct elfhdr); elf->e_phentsize= sizeof(struct elf_phdr); elf->e_phnum = nphdr; elf->e_shentsize= 0; elf->e_shnum = 0; elf->e_shstrndx = 0; /* setup ELF PT_NOTE program header */ nhdr = (struct elf_phdr *) bufp; bufp += sizeof(struct elf_phdr); offset += sizeof(struct elf_phdr); nhdr->p_type = PT_NOTE; nhdr->p_offset = 0; nhdr->p_vaddr = 0; nhdr->p_paddr = 0; nhdr->p_filesz = 0; nhdr->p_memsz = 0; nhdr->p_flags = 0; nhdr->p_align = 0; /* setup ELF PT_LOAD program header for every area */ list_for_each_entry(m, &kclist_head, list) { phdr = (struct elf_phdr *) bufp; bufp += sizeof(struct elf_phdr); offset += sizeof(struct elf_phdr); phdr->p_type = PT_LOAD; phdr->p_flags = PF_R|PF_W|PF_X; phdr->p_offset = kc_vaddr_to_offset(m->addr) + dataoff; phdr->p_vaddr = (size_t)m->addr; phdr->p_paddr = 0; phdr->p_filesz = phdr->p_memsz = m->size; phdr->p_align = PAGE_SIZE; } /* * Set up the notes in similar form to SVR4 core dumps made * with info from their /proc. */ nhdr->p_offset = offset; /* set up the process status */ notes[0].name = CORE_STR; notes[0].type = NT_PRSTATUS; notes[0].datasz = sizeof(struct elf_prstatus); notes[0].data = &prstatus; memset(&prstatus, 0, sizeof(struct elf_prstatus)); nhdr->p_filesz = notesize(¬es[0]); bufp = storenote(¬es[0], bufp); /* set up the process info */ notes[1].name = CORE_STR; notes[1].type = NT_PRPSINFO; notes[1].datasz = sizeof(struct elf_prpsinfo); notes[1].data = &prpsinfo; memset(&prpsinfo, 0, sizeof(struct elf_prpsinfo)); prpsinfo.pr_state = 0; prpsinfo.pr_sname = 'R'; prpsinfo.pr_zomb = 0; strcpy(prpsinfo.pr_fname, "vmlinux"); strncpy(prpsinfo.pr_psargs, saved_command_line, ELF_PRARGSZ); nhdr->p_filesz += notesize(¬es[1]); bufp = storenote(¬es[1], bufp); /* set up the task structure */ notes[2].name = CORE_STR; notes[2].type = NT_TASKSTRUCT; notes[2].datasz = sizeof(struct task_struct); notes[2].data = current; nhdr->p_filesz += notesize(¬es[2]); bufp = storenote(¬es[2], bufp); } /* end elf_kcore_store_hdr() */ /*****************************************************************************//* * read from the ELF header and then kernel memory */static ssize_tread_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos){ ssize_t acc = 0; size_t size, tsz; size_t elf_buflen; int nphdr; unsigned long start; read_lock(&kclist_lock); size = get_kcore_size(&nphdr, &elf_buflen); if (buflen == 0 || *fpos >= size) { read_unlock(&kclist_lock); return 0; } /* trim buflen to not go beyond EOF */ if (buflen > size - *fpos) buflen = size - *fpos; /* construct an ELF core header if we'll need some of it */ if (*fpos < elf_buflen) { char * elf_buf; tsz = elf_buflen - *fpos; if (buflen < tsz) tsz = buflen; elf_buf = kzalloc(elf_buflen, GFP_ATOMIC); if (!elf_buf) { read_unlock(&kclist_lock); return -ENOMEM; } elf_kcore_store_hdr(elf_buf, nphdr, elf_buflen); read_unlock(&kclist_lock); if (copy_to_user(buffer, elf_buf + *fpos, tsz)) { kfree(elf_buf); return -EFAULT; } kfree(elf_buf); buflen -= tsz; *fpos += tsz; buffer += tsz; acc += tsz; /* leave now if filled buffer already */ if (buflen == 0) return acc; } else read_unlock(&kclist_lock); /* * Check to see if our file offset matches with any of * the addresses in the elf_phdr on our list. */ start = kc_offset_to_vaddr(*fpos - elf_buflen); if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen) tsz = buflen; while (buflen) { struct kcore_list *m; read_lock(&kclist_lock); list_for_each_entry(m, &kclist_head, list) { if (start >= m->addr && start < (m->addr+m->size)) break; } read_unlock(&kclist_lock); if (&m->list == &kclist_head) { if (clear_user(buffer, tsz)) return -EFAULT; } else if (is_vmalloc_or_module_addr((void *)start)) { char * elf_buf;Lines 1–500 of 637. 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/* * fs/proc/kcore.c kernel ELF core dumper * * Modelled on fs/exec.c:aout_core_dump() * Jeremy Fitzhardinge <jeremy@sw.oz.au> * ELF version written by David Howells <David.Howells@nexor.co.uk> * Modified and incorporated into 2.3.x by Tigran Aivazian <tigran@veritas.com> * Support to dump vmalloc'd areas (ELF only), Tigran Aivazian <tigran@veritas.com> * Safe accesses to vmalloc/direct-mapped discontiguous areas, Kanoj Sarcar <kanoj@sgi.com> */ #include <linux/mm.h> #include <linux/proc_fs.h> #include <linux/user.h> #include <linux/capability.h> #include <linux/elf.h> #include <linux/elfcore.h> #include <linux/vmalloc.h> #include <linux/highmem.h> #include <linux/bootmem.h> #include <linux/init.h> #include <linux/slab.h> #include <asm/uaccess.h> #include <asm/io.h> #include <linux/list.h> #include <linux/ioport.h> #include <linux/memory.h> #include <asm/sections.h> #define CORE_STR "CORE" #ifndef ELF_CORE_EFLAGS #define ELF_CORE_EFLAGS 0 #endif static struct proc_dir_entry *proc_root_kcore; #ifndef kc_vaddr_to_offset #define kc_vaddr_to_offset(v) ((v) - PAGE_OFFSET) #endif #ifndef kc_offset_to_vaddr #define kc_offset_to_vaddr(o) ((o) + PAGE_OFFSET) #endif /* An ELF note in memory */ struct memelfnote { const char *name; int type; unsigned int datasz; void *data; }; static LIST_HEAD(kclist_head); static DEFINE_RWLOCK(kclist_lock); static int kcore_need_update = 1; void kclist_add(struct kcore_list *new, void *addr, size_t size, int type) { new->addr = (unsigned long)addr; new->size = size; new->type = type; write_lock(&kclist_lock); list_add_tail(&new->list, &kclist_head); write_unlock(&kclist_lock); } static size_t get_kcore_size(int *nphdr, size_t *elf_buflen) { size_t try, size; struct kcore_list *m; *nphdr = 1; /* PT_NOTE */ size = 0; list_for_each_entry(m, &kclist_head, list) { try = kc_vaddr_to_offset((size_t)m->addr + m->size); if (try > size) size = try; *nphdr = *nphdr + 1; } *elf_buflen = sizeof(struct elfhdr) + (*nphdr + 2)*sizeof(struct elf_phdr) + 3 * ((sizeof(struct elf_note)) + roundup(sizeof(CORE_STR), 4)) + roundup(sizeof(struct elf_prstatus), 4) + roundup(sizeof(struct elf_prpsinfo), 4) + roundup(sizeof(struct task_struct), 4); *elf_buflen = PAGE_ALIGN(*elf_buflen); return size + *elf_buflen; } static void free_kclist_ents(struct list_head *head) { struct kcore_list *tmp, *pos; list_for_each_entry_safe(pos, tmp, head, list) { list_del(&pos->list); kfree(pos); } } /* * Replace all KCORE_RAM/KCORE_VMEMMAP information with passed list. */ static void __kcore_update_ram(struct list_head *list) { int nphdr; size_t size; struct kcore_list *tmp, *pos; LIST_HEAD(garbage); write_lock(&kclist_lock); if (kcore_need_update) { list_for_each_entry_safe(pos, tmp, &kclist_head, list) { if (pos->type == KCORE_RAM || pos->type == KCORE_VMEMMAP) list_move(&pos->list, &garbage); } list_splice_tail(list, &kclist_head); } else list_splice(list, &garbage); kcore_need_update = 0; proc_root_kcore->size = get_kcore_size(&nphdr, &size); write_unlock(&kclist_lock); free_kclist_ents(&garbage); } #ifdef CONFIG_HIGHMEM /* * If no highmem, we can assume [0...max_low_pfn) continuous range of memory * because memory hole is not as big as !HIGHMEM case. * (HIGHMEM is special because part of memory is _invisible_ from the kernel.) */ static int kcore_update_ram(void) { LIST_HEAD(head); struct kcore_list *ent; int ret = 0; ent = kmalloc(sizeof(*ent), GFP_KERNEL); if (!ent) return -ENOMEM; ent->addr = (unsigned long)__va(0); ent->size = max_low_pfn << PAGE_SHIFT; ent->type = KCORE_RAM; list_add(&ent->list, &head); __kcore_update_ram(&head); return ret; } #else /* !CONFIG_HIGHMEM */ #ifdef CONFIG_SPARSEMEM_VMEMMAP /* calculate vmemmap's address from given system ram pfn and register it */ static int get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head) { unsigned long pfn = __pa(ent->addr) >> PAGE_SHIFT; unsigned long nr_pages = ent->size >> PAGE_SHIFT; unsigned long start, end; struct kcore_list *vmm, *tmp; start = ((unsigned long)pfn_to_page(pfn)) & PAGE_MASK; end = ((unsigned long)pfn_to_page(pfn + nr_pages)) - 1; end = ALIGN(end, PAGE_SIZE); /* overlap check (because we have to align page */ list_for_each_entry(tmp, head, list) { if (tmp->type != KCORE_VMEMMAP) continue; if (start < tmp->addr + tmp->size) if (end > tmp->addr) end = tmp->addr; } if (start < end) { vmm = kmalloc(sizeof(*vmm), GFP_KERNEL); if (!vmm) return 0; vmm->addr = start; vmm->size = end - start; vmm->type = KCORE_VMEMMAP; list_add_tail(&vmm->list, head); } return 1; } #else static int get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head) { return 1; } #endif static int kclist_add_private(unsigned long pfn, unsigned long nr_pages, void *arg) { struct list_head *head = (struct list_head *)arg; struct kcore_list *ent; ent = kmalloc(sizeof(*ent), GFP_KERNEL); if (!ent) return -ENOMEM; ent->addr = (unsigned long)__va((pfn << PAGE_SHIFT)); ent->size = nr_pages << PAGE_SHIFT; /* Sanity check: Can happen in 32bit arch...maybe */ if (ent->addr < (unsigned long) __va(0)) goto free_out; /* cut not-mapped area. ....from ppc-32 code. */ if (ULONG_MAX - ent->addr < ent->size) ent->size = ULONG_MAX - ent->addr; /* cut when vmalloc() area is higher than direct-map area */ if (VMALLOC_START > (unsigned long)__va(0)) { if (ent->addr > VMALLOC_START) goto free_out; if (VMALLOC_START - ent->addr < ent->size) ent->size = VMALLOC_START - ent->addr; } ent->type = KCORE_RAM; list_add_tail(&ent->list, head); if (!get_sparsemem_vmemmap_info(ent, head)) { list_del(&ent->list); goto free_out; } return 0; free_out: kfree(ent); return 1; } static int kcore_update_ram(void) { int nid, ret; unsigned long end_pfn; LIST_HEAD(head); /* Not inialized....update now */ /* find out "max pfn" */ end_pfn = 0; for_each_node_state(nid, N_HIGH_MEMORY) { unsigned long node_end; node_end = NODE_DATA(nid)->node_start_pfn + NODE_DATA(nid)->node_spanned_pages; if (end_pfn < node_end) end_pfn = node_end; } /* scan 0 to max_pfn */ ret = walk_system_ram_range(0, end_pfn, &head, kclist_add_private); if (ret) { free_kclist_ents(&head); return -ENOMEM; } __kcore_update_ram(&head); return ret; } #endif /* CONFIG_HIGHMEM */ /*****************************************************************************/ /* * determine size of ELF note */ static int notesize(struct memelfnote *en) { int sz; sz = sizeof(struct elf_note); sz += roundup((strlen(en->name) + 1), 4); sz += roundup(en->datasz, 4); return sz; } /* end notesize() */ /*****************************************************************************/ /* * store a note in the header buffer */ static char *storenote(struct memelfnote *men, char *bufp) { struct elf_note en; #define DUMP_WRITE(addr,nr) do { memcpy(bufp,addr,nr); bufp += nr; } while(0) en.n_namesz = strlen(men->name) + 1; en.n_descsz = men->datasz; en.n_type = men->type; DUMP_WRITE(&en, sizeof(en)); DUMP_WRITE(men->name, en.n_namesz); /* XXX - cast from long long to long to avoid need for libgcc.a */ bufp = (char*) roundup((unsigned long)bufp,4); DUMP_WRITE(men->data, men->datasz); bufp = (char*) roundup((unsigned long)bufp,4); #undef DUMP_WRITE return bufp; } /* end storenote() */ /* * store an ELF coredump header in the supplied buffer * nphdr is the number of elf_phdr to insert */ static void elf_kcore_store_hdr(char *bufp, int nphdr, int dataoff) { struct elf_prstatus prstatus; /* NT_PRSTATUS */ struct elf_prpsinfo prpsinfo; /* NT_PRPSINFO */ struct elf_phdr *nhdr, *phdr; struct elfhdr *elf; struct memelfnote notes[3]; off_t offset = 0; struct kcore_list *m; /* setup ELF header */ elf = (struct elfhdr *) bufp; bufp += sizeof(struct elfhdr); offset += sizeof(struct elfhdr); memcpy(elf->e_ident, ELFMAG, SELFMAG); elf->e_ident[EI_CLASS] = ELF_CLASS; elf->e_ident[EI_DATA] = ELF_DATA; elf->e_ident[EI_VERSION]= EV_CURRENT; elf->e_ident[EI_OSABI] = ELF_OSABI; memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); elf->e_type = ET_CORE; elf->e_machine = ELF_ARCH; elf->e_version = EV_CURRENT; elf->e_entry = 0; elf->e_phoff = sizeof(struct elfhdr); elf->e_shoff = 0; elf->e_flags = ELF_CORE_EFLAGS; elf->e_ehsize = sizeof(struct elfhdr); elf->e_phentsize= sizeof(struct elf_phdr); elf->e_phnum = nphdr; elf->e_shentsize= 0; elf->e_shnum = 0; elf->e_shstrndx = 0; /* setup ELF PT_NOTE program header */ nhdr = (struct elf_phdr *) bufp; bufp += sizeof(struct elf_phdr); offset += sizeof(struct elf_phdr); nhdr->p_type = PT_NOTE; nhdr->p_offset = 0; nhdr->p_vaddr = 0; nhdr->p_paddr = 0; nhdr->p_filesz = 0; nhdr->p_memsz = 0; nhdr->p_flags = 0; nhdr->p_align = 0; /* setup ELF PT_LOAD program header for every area */ list_for_each_entry(m, &kclist_head, list) { phdr = (struct elf_phdr *) bufp; bufp += sizeof(struct elf_phdr); offset += sizeof(struct elf_phdr); phdr->p_type = PT_LOAD; phdr->p_flags = PF_R|PF_W|PF_X; phdr->p_offset = kc_vaddr_to_offset(m->addr) + dataoff; phdr->p_vaddr = (size_t)m->addr; phdr->p_paddr = 0; phdr->p_filesz = phdr->p_memsz = m->size; phdr->p_align = PAGE_SIZE; } /* * Set up the notes in similar form to SVR4 core dumps made * with info from their /proc. */ nhdr->p_offset = offset; /* set up the process status */ notes[0].name = CORE_STR; notes[0].type = NT_PRSTATUS; notes[0].datasz = sizeof(struct elf_prstatus); notes[0].data = &prstatus; memset(&prstatus, 0, sizeof(struct elf_prstatus)); nhdr->p_filesz = notesize(¬es[0]); bufp = storenote(¬es[0], bufp); /* set up the process info */ notes[1].name = CORE_STR; notes[1].type = NT_PRPSINFO; notes[1].datasz = sizeof(struct elf_prpsinfo); notes[1].data = &prpsinfo; memset(&prpsinfo, 0, sizeof(struct elf_prpsinfo)); prpsinfo.pr_state = 0; prpsinfo.pr_sname = 'R'; prpsinfo.pr_zomb = 0; strcpy(prpsinfo.pr_fname, "vmlinux"); strncpy(prpsinfo.pr_psargs, saved_command_line, ELF_PRARGSZ); nhdr->p_filesz += notesize(¬es[1]); bufp = storenote(¬es[1], bufp); /* set up the task structure */ notes[2].name = CORE_STR; notes[2].type = NT_TASKSTRUCT; notes[2].datasz = sizeof(struct task_struct); notes[2].data = current; nhdr->p_filesz += notesize(¬es[2]); bufp = storenote(¬es[2], bufp); } /* end elf_kcore_store_hdr() */ /*****************************************************************************/ /* * read from the ELF header and then kernel memory */ static ssize_t read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos) { ssize_t acc = 0; size_t size, tsz; size_t elf_buflen; int nphdr; unsigned long start; read_lock(&kclist_lock); size = get_kcore_size(&nphdr, &elf_buflen); if (buflen == 0 || *fpos >= size) { read_unlock(&kclist_lock); return 0; } /* trim buflen to not go beyond EOF */ if (buflen > size - *fpos) buflen = size - *fpos; /* construct an ELF core header if we'll need some of it */ if (*fpos < elf_buflen) { char * elf_buf; tsz = elf_buflen - *fpos; if (buflen < tsz) tsz = buflen; elf_buf = kzalloc(elf_buflen, GFP_ATOMIC); if (!elf_buf) { read_unlock(&kclist_lock); return -ENOMEM; } elf_kcore_store_hdr(elf_buf, nphdr, elf_buflen); read_unlock(&kclist_lock); if (copy_to_user(buffer, elf_buf + *fpos, tsz)) { kfree(elf_buf); return -EFAULT; } kfree(elf_buf); buflen -= tsz; *fpos += tsz; buffer += tsz; acc += tsz; /* leave now if filled buffer already */ if (buflen == 0) return acc; } else read_unlock(&kclist_lock); /* * Check to see if our file offset matches with any of * the addresses in the elf_phdr on our list. */ start = kc_offset_to_vaddr(*fpos - elf_buflen); if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen) tsz = buflen; while (buflen) { struct kcore_list *m; read_lock(&kclist_lock); list_for_each_entry(m, &kclist_head, list) { if (start >= m->addr && start < (m->addr+m->size)) break; } read_unlock(&kclist_lock); if (&m->list == &kclist_head) { if (clear_user(buffer, tsz)) return -EFAULT; } else if (is_vmalloc_or_module_addr((void *)start)) { char * elf_buf;