int pr_fpvalid; /* True if math co-processor being used. */
};
-/*
- * 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, unsigned long mm_flags)
-{
- int dump_ok;
-
- /* Do not dump I/O mapped devices or special mappings */
- if (vma->vm_flags & VM_IO) {
- 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;
- }
-
- /* support for DAX */
- if (vma_is_dax(vma)) {
- if (vma->vm_flags & VM_SHARED) {
- dump_ok = test_bit(MMF_DUMP_DAX_SHARED, &mm_flags);
- kdcore("%08lx: %08lx: %s (DAX shared)", vma->vm_start,
- vma->vm_flags, dump_ok ? "yes" : "no");
- } else {
- dump_ok = test_bit(MMF_DUMP_DAX_PRIVATE, &mm_flags);
- kdcore("%08lx: %08lx: %s (DAX private)", vma->vm_start,
- vma->vm_flags, dump_ok ? "yes" : "no");
- }
- return dump_ok;
- }
-
- /* By default, dump shared memory if mapped from an anonymous file. */
- if (vma->vm_flags & VM_SHARED) {
- if (file_inode(vma->vm_file)->i_nlink == 0) {
- dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags);
- kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
- vma->vm_flags, dump_ok ? "yes" : "no");
- return dump_ok;
- }
-
- dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags);
- kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
- vma->vm_flags, dump_ok ? "yes" : "no");
- return dump_ok;
- }
-
-#ifdef CONFIG_MMU
- /* By default, if it hasn't been written to, don't write it out */
- if (!vma->anon_vma) {
- dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags);
- kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start,
- vma->vm_flags, dump_ok ? "yes" : "no");
- return dump_ok;
- }
-#endif
-
- dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags);
- kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags,
- dump_ok ? "yes" : "no");
- return dump_ok;
-}
-
/* An ELF note in memory */
struct memelfnote
{
/*
* dump the segments for an MMU process
*/
-static bool elf_fdpic_dump_segments(struct coredump_params *cprm)
+static bool elf_fdpic_dump_segments(struct coredump_params *cprm,
+ struct core_vma_metadata *vma_meta,
+ int vma_count)
{
- struct vm_area_struct *vma;
+ int i;
- for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
-#ifdef CONFIG_MMU
- unsigned long addr;
-#endif
+ for (i = 0; i < vma_count; i++) {
+ struct core_vma_metadata *meta = vma_meta + i;
- if (!maydump(vma, cprm->mm_flags))
- continue;
-
-#ifdef CONFIG_MMU
- for (addr = vma->vm_start; addr < vma->vm_end;
- addr += PAGE_SIZE) {
- bool res;
- struct page *page = get_dump_page(addr);
- if (page) {
- void *kaddr = kmap(page);
- res = dump_emit(cprm, kaddr, PAGE_SIZE);
- kunmap(page);
- put_page(page);
- } else {
- res = dump_skip(cprm, PAGE_SIZE);
- }
- if (!res)
- return false;
- }
-#else
- if (!dump_emit(cprm, (void *) vma->vm_start,
- vma->vm_end - vma->vm_start))
+ if (!dump_user_range(cprm, meta->start, meta->dump_size))
return false;
-#endif
}
return true;
}
-static size_t elf_core_vma_data_size(unsigned long mm_flags)
-{
- struct vm_area_struct *vma;
- size_t size = 0;
-
- for (vma = current->mm->mmap; vma; vma = vma->vm_next)
- if (maydump(vma, mm_flags))
- size += vma->vm_end - vma->vm_start;
- return size;
-}
-
/*
* Actual dumper
*
static int elf_fdpic_core_dump(struct coredump_params *cprm)
{
int has_dumped = 0;
- int segs;
+ int vma_count, segs;
int i;
- struct vm_area_struct *vma;
struct elfhdr *elf = NULL;
loff_t offset = 0, dataoff;
struct memelfnote psinfo_note, auxv_note;
elf_addr_t e_shoff;
struct core_thread *ct;
struct elf_thread_status *tmp;
-
- /*
- * 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.
- */
+ struct core_vma_metadata *vma_meta = NULL;
+ size_t vma_data_size;
/* alloc memory for large data structures: too large to be on stack */
elf = kmalloc(sizeof(*elf), GFP_KERNEL);
if (!psinfo)
goto end_coredump;
+ if (dump_vma_snapshot(cprm, &vma_count, &vma_meta, &vma_data_size))
+ goto end_coredump;
+
for (ct = current->mm->core_state->dumper.next;
ct; ct = ct->next) {
tmp = elf_dump_thread_status(cprm->siginfo->si_signo,
tmp->next = thread_list;
thread_list = tmp;
- segs = current->mm->map_count;
- segs += elf_core_extra_phdrs();
+ segs = vma_count + elf_core_extra_phdrs();
/* for notes section */
segs++;
/* Page-align dumped data */
dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
- offset += elf_core_vma_data_size(cprm->mm_flags);
+ offset += vma_data_size;
offset += elf_core_extra_data_size();
e_shoff = offset;
goto end_coredump;
/* write program headers for segments dump */
- for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
+ for (i = 0; i < vma_count; i++) {
+ struct core_vma_metadata *meta = vma_meta + i;
struct elf_phdr phdr;
size_t sz;
- sz = vma->vm_end - vma->vm_start;
+ sz = meta->end - meta->start;
phdr.p_type = PT_LOAD;
phdr.p_offset = offset;
- phdr.p_vaddr = vma->vm_start;
+ phdr.p_vaddr = meta->start;
phdr.p_paddr = 0;
- phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0;
+ phdr.p_filesz = meta->dump_size;
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 = 0;
+ if (meta->flags & VM_READ)
+ phdr.p_flags |= PF_R;
+ if (meta->flags & VM_WRITE)
phdr.p_flags |= PF_W;
- if (vma->vm_flags & VM_EXEC)
+ if (meta->flags & VM_EXEC)
phdr.p_flags |= PF_X;
phdr.p_align = ELF_EXEC_PAGESIZE;
if (!dump_skip(cprm, dataoff - cprm->pos))
goto end_coredump;
- if (!elf_fdpic_dump_segments(cprm))
+ if (!elf_fdpic_dump_segments(cprm, vma_meta, vma_count))
goto end_coredump;
if (!elf_core_write_extra_data(cprm))
thread_list = thread_list->next;
kfree(tmp);
}
+ kvfree(vma_meta);
kfree(phdr4note);
kfree(elf);
kfree(psinfo);
projects / linux-2.6-microblaze.git / blobdiff