elfcore.c

Go to the documentation of this file.

#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;
}