-}
-
-/*****************************************************************************/
-/*
- * ELF-FDPIC core dumper
- *
- * Modelled on fs/exec.c:aout_core_dump()
- * Jeremy Fitzhardinge <jeremy@sw.oz.au>
- *
- * Modelled on fs/binfmt_elf.c core dumper
- */
-#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
-
-/*
- * These are the only things you should do on a core-file: use only these
- * functions to write out all the necessary info.
- */
-static int dump_write(struct file *file, const void *addr, int nr)
-{
- return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
-}
-
-static int dump_seek(struct file *file, loff_t off)
-{
- if (file->f_op->llseek) {
- if (file->f_op->llseek(file, off, SEEK_SET) != off)
- return 0;
- } else {
- file->f_pos = off;
- }
- return 1;
-}
-
-/*
- * Decide whether a segment is worth dumping; default is yes to be
- * sure (missing info is worse than too much; etc).
- * Personally I'd include everything, and use the coredump limit...
- *
- * I think we should skip something. But I am not sure how. H.J.
- */
-static int maydump(struct vm_area_struct *vma)
-{
- /* Do not dump I/O mapped devices or special mappings */
- if (vma->vm_flags & (VM_IO | VM_RESERVED)) {
- kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags);
- return 0;
- }
-
- /* If we may not read the contents, don't allow us to dump
- * them either. "dump_write()" can't handle it anyway.
- */
- if (!(vma->vm_flags & VM_READ)) {
- kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags);
- return 0;
- }
-
- /* Dump shared memory only if mapped from an anonymous file. */
- if (vma->vm_flags & VM_SHARED) {
- if (vma->vm_file->f_dentry->d_inode->i_nlink == 0) {
- kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags);
- return 1;
- }
-
- kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags);
- return 0;
- }
-
-#ifdef CONFIG_MMU
- /* If it hasn't been written to, don't write it out */
- if (!vma->anon_vma) {
- kdcore("%08lx: %08lx: no (!anon)", vma->vm_start, vma->vm_flags);
- return 0;
- }
-#endif
-
- kdcore("%08lx: %08lx: yes", vma->vm_start, vma->vm_flags);
- return 1;
-}
-
-/* An ELF note in memory */
-struct memelfnote
-{
- const char *name;
- int type;
- unsigned int datasz;
- void *data;
-};
-
-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;
-}
-
-/* #define DEBUG */
-
-#define DUMP_WRITE(addr, nr) \
- do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
-#define DUMP_SEEK(off) \
- do { if (!dump_seek(file, (off))) return 0; } while(0)
-
-static int writenote(struct memelfnote *men, struct file *file)
-{
- struct elf_note en;
-
- 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 */
- DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
- DUMP_WRITE(men->data, men->datasz);
- DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
-
- return 1;
-}
-#undef DUMP_WRITE
-#undef DUMP_SEEK
-
-#define DUMP_WRITE(addr, nr) \
- if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
- goto end_coredump;
-#define DUMP_SEEK(off) \
- if (!dump_seek(file, (off))) \
- goto end_coredump;
-
-static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
-{
- 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_FDPIC_CORE_EFLAGS;
- elf->e_ehsize = sizeof(struct elfhdr);
- elf->e_phentsize = sizeof(struct elf_phdr);
- elf->e_phnum = segs;
- elf->e_shentsize = 0;
- elf->e_shnum = 0;
- elf->e_shstrndx = 0;
- return;
-}
-
-static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
-{
- phdr->p_type = PT_NOTE;
- phdr->p_offset = offset;
- phdr->p_vaddr = 0;
- phdr->p_paddr = 0;
- phdr->p_filesz = sz;
- phdr->p_memsz = 0;
- phdr->p_flags = 0;
- phdr->p_align = 0;
- return;
-}
-
-static inline void fill_note(struct memelfnote *note, const char *name, int type,
- unsigned int sz, void *data)
-{
- note->name = name;
- note->type = type;
- note->datasz = sz;
- note->data = data;
- return;
-}
-
-/*
- * fill up all the fields in prstatus from the given task struct, except
- * registers which need to be filled up seperately.
- */
-static void fill_prstatus(struct elf_prstatus *prstatus,
- struct task_struct *p, long signr)
-{
- prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
- prstatus->pr_sigpend = p->pending.signal.sig[0];
- prstatus->pr_sighold = p->blocked.sig[0];
- prstatus->pr_pid = p->pid;
- prstatus->pr_ppid = p->parent->pid;
- prstatus->pr_pgrp = process_group(p);
- prstatus->pr_sid = p->signal->session;
- if (thread_group_leader(p)) {
- /*
- * This is the record for the group leader. Add in the
- * cumulative times of previous dead threads. This total
- * won't include the time of each live thread whose state
- * is included in the core dump. The final total reported
- * to our parent process when it calls wait4 will include
- * those sums as well as the little bit more time it takes
- * this and each other thread to finish dying after the
- * core dump synchronization phase.
- */
- cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
- &prstatus->pr_utime);
- cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
- &prstatus->pr_stime);
- } else {
- cputime_to_timeval(p->utime, &prstatus->pr_utime);
- cputime_to_timeval(p->stime, &prstatus->pr_stime);
- }
- cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
- cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
-
- prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
- prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
-}
-
-static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
- struct mm_struct *mm)
-{
- unsigned int i, len;
-
- /* first copy the parameters from user space */
- memset(psinfo, 0, sizeof(struct elf_prpsinfo));
-
- len = mm->arg_end - mm->arg_start;
- if (len >= ELF_PRARGSZ)
- len = ELF_PRARGSZ - 1;
- if (copy_from_user(&psinfo->pr_psargs,
- (const char __user *) mm->arg_start, len))
- return -EFAULT;
- for (i = 0; i < len; i++)
- if (psinfo->pr_psargs[i] == 0)
- psinfo->pr_psargs[i] = ' ';
- psinfo->pr_psargs[len] = 0;
-
- psinfo->pr_pid = p->pid;
- psinfo->pr_ppid = p->parent->pid;
- psinfo->pr_pgrp = process_group(p);
- psinfo->pr_sid = p->signal->session;
-
- i = p->state ? ffz(~p->state) + 1 : 0;
- psinfo->pr_state = i;
- psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
- psinfo->pr_zomb = psinfo->pr_sname == 'Z';
- psinfo->pr_nice = task_nice(p);
- psinfo->pr_flag = p->flags;
- SET_UID(psinfo->pr_uid, p->uid);
- SET_GID(psinfo->pr_gid, p->gid);
- strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
-
- return 0;
-}
-
-/* Here is the structure in which status of each thread is captured. */
-struct elf_thread_status
-{
- struct list_head list;
- struct elf_prstatus prstatus; /* NT_PRSTATUS */
- elf_fpregset_t fpu; /* NT_PRFPREG */
- struct task_struct *thread;
-#ifdef ELF_CORE_COPY_XFPREGS
- elf_fpxregset_t xfpu; /* NT_PRXFPREG */
-#endif
- struct memelfnote notes[3];
- int num_notes;
-};
-
-/*
- * In order to add the specific thread information for the elf file format,
- * we need to keep a linked list of every thread's pr_status and then create
- * a single section for them in the final core file.
- */
-static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
-{
- struct task_struct *p = t->thread;
- int sz = 0;
-
- t->num_notes = 0;
-
- fill_prstatus(&t->prstatus, p, signr);
- elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
-
- fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
- &t->prstatus);
- t->num_notes++;
- sz += notesize(&t->notes[0]);
-
- t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
- if (t->prstatus.pr_fpvalid) {
- fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
- &t->fpu);
- t->num_notes++;
- sz += notesize(&t->notes[1]);
- }
-
-#ifdef ELF_CORE_COPY_XFPREGS
- if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
- fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu),
- &t->xfpu);
- t->num_notes++;
- sz += notesize(&t->notes[2]);
- }
-#endif
- return sz;
-}
-
-/*
- * dump the segments for an MMU process
- */
-#ifdef CONFIG_MMU
-static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm,
- size_t *size, unsigned long *limit)
-{
- struct vm_area_struct *vma;
-
- for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
- unsigned long addr;
-
- if (!maydump(vma))
- continue;
-
- for (addr = vma->vm_start;
- addr < vma->vm_end;
- addr += PAGE_SIZE
- ) {
- struct vm_area_struct *vma;
- struct page *page;
-
- if (get_user_pages(current, current->mm, addr, 1, 0, 1,
- &page, &vma) <= 0) {
- DUMP_SEEK(file->f_pos + PAGE_SIZE);
- }
- else if (page == ZERO_PAGE(addr)) {
- DUMP_SEEK(file->f_pos + PAGE_SIZE);
- page_cache_release(page);
- }
- else {
- void *kaddr;
-
- flush_cache_page(vma, addr, page_to_pfn(page));
- kaddr = kmap(page);
- if ((*size += PAGE_SIZE) > *limit ||
- !dump_write(file, kaddr, PAGE_SIZE)
- ) {
- kunmap(page);
- page_cache_release(page);
- return -EIO;
- }
- kunmap(page);
- page_cache_release(page);
- }
- }
- }
-
- return 0;
-
-end_coredump:
- return -EFBIG;
-}
-#endif
-
-/*
- * dump the segments for a NOMMU process
- */
-#ifndef CONFIG_MMU
-static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm,
- size_t *size, unsigned long *limit)
-{
- struct vm_list_struct *vml;
-
- for (vml = current->mm->context.vmlist; vml; vml = vml->next) {
- struct vm_area_struct *vma = vml->vma;
-
- if (!maydump(vma))
- continue;
-
- if ((*size += PAGE_SIZE) > *limit)
- return -EFBIG;
-
- if (!dump_write(file, (void *) vma->vm_start,
- vma->vm_end - vma->vm_start))
- return -EIO;
- }
-
- return 0;
-}
-#endif
-
-/*
- * Actual dumper
- *
- * This is a two-pass process; first we find the offsets of the bits,
- * and then they are actually written out. If we run out of core limit
- * we just truncate.
- */
-static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
- struct file *file)
-{
-#define NUM_NOTES 6
- int has_dumped = 0;
- mm_segment_t fs;
- int segs;
- size_t size = 0;
- int i;
- struct vm_area_struct *vma;
- struct elfhdr *elf = NULL;
- loff_t offset = 0, dataoff;
- unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
- int numnote;
- struct memelfnote *notes = NULL;
- struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
- struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
- struct task_struct *g, *p;
- LIST_HEAD(thread_list);
- struct list_head *t;
- elf_fpregset_t *fpu = NULL;
-#ifdef ELF_CORE_COPY_XFPREGS
- elf_fpxregset_t *xfpu = NULL;
-#endif
- int thread_status_size = 0;
-#ifndef CONFIG_MMU
- struct vm_list_struct *vml;
-#endif
- elf_addr_t *auxv;
-
- /*
- * We no longer stop all VM operations.
- *
- * This is because those proceses that could possibly change map_count
- * or the mmap / vma pages are now blocked in do_exit on current
- * finishing this core dump.
- *
- * Only ptrace can touch these memory addresses, but it doesn't change
- * the map_count or the pages allocated. So no possibility of crashing
- * exists while dumping the mm->vm_next areas to the core file.
- */
-
- /* alloc memory for large data structures: too large to be on stack */
- elf = kmalloc(sizeof(*elf), GFP_KERNEL);
- if (!elf)
- goto cleanup;
- prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
- if (!prstatus)
- goto cleanup;
- psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
- if (!psinfo)
- goto cleanup;
- notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
- if (!notes)
- goto cleanup;
- fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
- if (!fpu)
- goto cleanup;
-#ifdef ELF_CORE_COPY_XFPREGS
- xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
- if (!xfpu)
- goto cleanup;
-#endif
-
- if (signr) {
- struct elf_thread_status *tmp;
- read_lock(&tasklist_lock);
- do_each_thread(g,p)
- if (current->mm == p->mm && current != p) {
- tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
- if (!tmp) {
- read_unlock(&tasklist_lock);
- goto cleanup;
- }
- INIT_LIST_HEAD(&tmp->list);
- tmp->thread = p;
- list_add(&tmp->list, &thread_list);
- }
- while_each_thread(g,p);
- read_unlock(&tasklist_lock);
- list_for_each(t, &thread_list) {
- struct elf_thread_status *tmp;
- int sz;
-
- tmp = list_entry(t, struct elf_thread_status, list);
- sz = elf_dump_thread_status(signr, tmp);
- thread_status_size += sz;
- }
- }
-
- /* now collect the dump for the current */
- fill_prstatus(prstatus, current, signr);
- elf_core_copy_regs(&prstatus->pr_reg, regs);
-
-#ifdef CONFIG_MMU
- segs = current->mm->map_count;
-#else
- segs = 0;
- for (vml = current->mm->context.vmlist; vml; vml = vml->next)
- segs++;
-#endif
-#ifdef ELF_CORE_EXTRA_PHDRS
- segs += ELF_CORE_EXTRA_PHDRS;
-#endif
-
- /* Set up header */
- fill_elf_fdpic_header(elf, segs + 1); /* including notes section */
-
- has_dumped = 1;
- current->flags |= PF_DUMPCORE;
-
- /*
- * Set up the notes in similar form to SVR4 core dumps made
- * with info from their /proc.
- */
-
- fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
- fill_psinfo(psinfo, current->group_leader, current->mm);
- fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
-
- numnote = 2;
-
- auxv = (elf_addr_t *) current->mm->saved_auxv;
-
- i = 0;
- do
- i += 2;
- while (auxv[i - 2] != AT_NULL);
- fill_note(¬es[numnote++], "CORE", NT_AUXV,
- i * sizeof(elf_addr_t), auxv);
-
- /* Try to dump the FPU. */
- if ((prstatus->pr_fpvalid =
- elf_core_copy_task_fpregs(current, regs, fpu)))
- fill_note(notes + numnote++,
- "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
-#ifdef ELF_CORE_COPY_XFPREGS
- if (elf_core_copy_task_xfpregs(current, xfpu))
- fill_note(notes + numnote++,
- "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu);
-#endif
-
- fs = get_fs();
- set_fs(KERNEL_DS);
-
- DUMP_WRITE(elf, sizeof(*elf));
- offset += sizeof(*elf); /* Elf header */
- offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */
-
- /* Write notes phdr entry */
- {
- struct elf_phdr phdr;
- int sz = 0;
-
- for (i = 0; i < numnote; i++)
- sz += notesize(notes + i);
-
- sz += thread_status_size;
-
- fill_elf_note_phdr(&phdr, sz, offset);
- offset += sz;
- DUMP_WRITE(&phdr, sizeof(phdr));
- }
-
- /* Page-align dumped data */
- dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
-
- /* write program headers for segments dump */
- for (
-#ifdef CONFIG_MMU
- vma = current->mm->mmap; vma; vma = vma->vm_next
-#else
- vml = current->mm->context.vmlist; vml; vml = vml->next
-#endif
- ) {
- struct elf_phdr phdr;
- size_t sz;
-
-#ifndef CONFIG_MMU
- vma = vml->vma;
-#endif
-
- sz = vma->vm_end - vma->vm_start;
-
- phdr.p_type = PT_LOAD;
- phdr.p_offset = offset;
- phdr.p_vaddr = vma->vm_start;
- phdr.p_paddr = 0;
- phdr.p_filesz = maydump(vma) ? sz : 0;
- phdr.p_memsz = sz;
- offset += phdr.p_filesz;
- phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
- if (vma->vm_flags & VM_WRITE)
- phdr.p_flags |= PF_W;
- if (vma->vm_flags & VM_EXEC)
- phdr.p_flags |= PF_X;
- phdr.p_align = ELF_EXEC_PAGESIZE;
-
- DUMP_WRITE(&phdr, sizeof(phdr));
- }
-
-#ifdef ELF_CORE_WRITE_EXTRA_PHDRS
- ELF_CORE_WRITE_EXTRA_PHDRS;
-#endif
-
- /* write out the notes section */
- for (i = 0; i < numnote; i++)
- if (!writenote(notes + i, file))
- goto end_coredump;
-
- /* write out the thread status notes section */
- list_for_each(t, &thread_list) {
- struct elf_thread_status *tmp =
- list_entry(t, struct elf_thread_status, list);
-
- for (i = 0; i < tmp->num_notes; i++)
- if (!writenote(&tmp->notes[i], file))
- goto end_coredump;
- }
-
- DUMP_SEEK(dataoff);
-
- if (elf_fdpic_dump_segments(file, current->mm, &size, &limit) < 0)
- goto end_coredump;
-
-#ifdef ELF_CORE_WRITE_EXTRA_DATA
- ELF_CORE_WRITE_EXTRA_DATA;
-#endif
-
- if (file->f_pos != offset) {
- /* Sanity check */
- printk(KERN_WARNING
- "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
- file->f_pos, offset);
- }
-
-end_coredump:
- set_fs(fs);
-
-cleanup:
- while (!list_empty(&thread_list)) {
- struct list_head *tmp = thread_list.next;
- list_del(tmp);
- kfree(list_entry(tmp, struct elf_thread_status, list));
- }
-
- kfree(elf);
- kfree(prstatus);
- kfree(psinfo);
- kfree(notes);
- kfree(fpu);
-#ifdef ELF_CORE_COPY_XFPREGS
- kfree(xfpu);
-#endif
- return has_dumped;
-#undef NUM_NOTES
-}
-
-#endif /* USE_ELF_CORE_DUMP */