Linux内核中ELF加载解析（五）

for (i = 0; i < loc->elf_ex.e_phnum; i++) {
    if (elf_ppnt->p_type == PT_INTERP) {
        /* This is the program interpreter used for
         * shared libraries - for now assume that this
         * is an a.out format binary
         */
        retval = -ENOEXEC;
        if (elf_ppnt->p_filesz > PATH_MAX || 
            elf_ppnt->p_filesz < 2)
            goto out_free_ph;

        retval = -ENOMEM;
        elf_interpreter = kmalloc(elf_ppnt->p_filesz,
                                          GFP_KERNEL);
        if (!elf_interpreter)
            goto out_free_ph;

        retval = kernel_read(bprm->file, elf_ppnt->p_offset,
                                         elf_interpreter,
                                         elf_ppnt->p_filesz);
        if (retval != elf_ppnt->p_filesz) {
            if (retval >= 0)
                retval = -EIO;
                goto out_free_interp;
        }
        /* make sure path is NULL terminated */
        retval = -ENOEXEC;
        if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
            goto out_free_interp;

        interpreter = open_exec(elf_interpreter);
        retval = PTR_ERR(interpreter);
        if (IS_ERR(interpreter))
            goto out_free_interp;

        /*
         * If the binary is not readable then enforce
         * mm->dumpable = 0 regardless of the interpreter's
         * permissions.
         */
        would_dump(bprm, interpreter);

        retval = kernel_read(interpreter, 0, bprm->buf,
                             BINPRM_BUF_SIZE);
        if (retval != BINPRM_BUF_SIZE) {
            if (retval >= 0)
                retval = -EIO;
                goto out_free_dentry;
            }

            /* Get the exec headers */
            loc->interp_elf_ex = *((struct elfhdr *)bprm->buf);
            break;
       }
       elf_ppnt++;
}

/lib64/ld-linux-x86-64.so.2

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