elfcore.c

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

#include <asm/elf.h>


Elf32_Half elf_core_extra_phdrs(void)
{
    return vsyscall_ehdr ? (((struct elfhdr *)vsyscall_ehdr)->e_phnum) : 0;
}

int elf_core_write_extra_phdrs(struct file *file, loff_t offset, size_t *size,
                   unsigned long limit)
{
    if ( vsyscall_ehdr ) {
        const struct elfhdr *const ehdrp =
            (struct elfhdr *) vsyscall_ehdr;
        const struct elf_phdr *const phdrp =
            (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
        int i;
        Elf32_Off ofs = 0;

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

            if (phdr.p_type == PT_LOAD) {
                ofs = phdr.p_offset = offset;
                offset += phdr.p_filesz;
            } 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)
{
    if ( vsyscall_ehdr ) {
        const struct elfhdr *const ehdrp =
            (struct elfhdr *) vsyscall_ehdr;
        const struct elf_phdr *const phdrp =
            (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
        int i;

        for (i = 0; i < ehdrp->e_phnum; ++i) {
            if (phdrp[i].p_type == PT_LOAD) {
                void *addr = (void *) phdrp[i].p_vaddr;
                size_t filesz = phdrp[i].p_filesz;

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

size_t elf_core_extra_data_size(void)
{
    if ( vsyscall_ehdr ) {
        const struct elfhdr *const ehdrp =
            (struct elfhdr *)vsyscall_ehdr;
        const struct elf_phdr *const phdrp =
            (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
        int i;

        for (i = 0; i < ehdrp->e_phnum; ++i)
            if (phdrp[i].p_type == PT_LOAD)
                return (size_t) phdrp[i].p_filesz;
    }
    return 0;
}