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elfcore.c

#include <linux/elf.h>
#include <linux/coredump.h>
#include <linux/fs.h>
#include <linux/mm.h>

#include <asm/elf.h>


Elf64_Half elf_core_extra_phdrs(void)
{
      return GATE_EHDR->e_phnum;
}

int elf_core_write_extra_phdrs(struct file *file, loff_t offset, size_t *size,
                         unsigned long limit)
{
      const struct elf_phdr *const gate_phdrs =
            (const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
      int i;
      Elf64_Off ofs = 0;

      for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
            struct elf_phdr phdr = gate_phdrs[i];

            if (phdr.p_type == PT_LOAD) {
                  phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz);
                  phdr.p_filesz = phdr.p_memsz;
                  if (ofs == 0) {
                        ofs = phdr.p_offset = offset;
                        offset += phdr.p_filesz;
                  } else {
                        phdr.p_offset = ofs;
                  }
            } else {
                  phdr.p_offset += ofs;
            }
            phdr.p_paddr = 0; /* match other core phdrs */
            *size += sizeof(phdr);
            if (*size > limit || !dump_write(file, &phdr, sizeof(phdr)))
                  return 0;
      }
      return 1;
}

int elf_core_write_extra_data(struct file *file, size_t *size,
                        unsigned long limit)
{
      const struct elf_phdr *const gate_phdrs =
            (const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
      int i;

      for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
            if (gate_phdrs[i].p_type == PT_LOAD) {
                  void *addr = (void *)gate_phdrs[i].p_vaddr;
                  size_t memsz = PAGE_ALIGN(gate_phdrs[i].p_memsz);

                  *size += memsz;
                  if (*size > limit || !dump_write(file, addr, memsz))
                        return 0;
                  break;
            }
      }
      return 1;
}

size_t elf_core_extra_data_size(void)
{
      const struct elf_phdr *const gate_phdrs =
            (const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
      int i;
      size_t size = 0;

      for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
            if (gate_phdrs[i].p_type == PT_LOAD) {
                  size += PAGE_ALIGN(gate_phdrs[i].p_memsz);
                  break;
            }
      }
      return size;
}

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