/* Initialize interrupt frame and load executable. */
memset (&if_, 0, sizeof if_);
+ if_.gs = SEL_UDSEG;
+ if_.fs = SEL_UDSEG;
if_.es = SEL_UDSEG;
if_.ds = SEL_UDSEG;
if_.cs = SEL_UCSEG;
arguments on the stack in the form of a `struct intr_frame',
we just point the stack pointer (%esp) to our stack frame
and jump to it. */
- asm ("mov %0, %%esp\n"
- "jmp intr_exit\n"
- : /* no outputs */
- : "g" (&if_));
+ asm ("mov %%esp, %0; jmp intr_exit" :: "g" (&if_));
NOT_REACHED ();
}
{
struct Elf32_Phdr phdr;
+ if (file_ofs < 0 || file_ofs > file_length (file))
+ LOAD_ERROR (("bad file offset %ld", (long) file_ofs));
file_seek (file, file_ofs);
+
if (file_read (file, &phdr, sizeof phdr) != sizeof phdr)
LOAD_ERROR (("error reading program header"));
file_ofs += sizeof phdr;
return false;
}
+ /* p_offset must point within file. */
+ if (phdr->p_offset > (Elf32_Off) file_length (file))
+ {
+ printf ("bad p_offset %"PE32Ox, phdr->p_offset);
+ return false;
+ }
+
/* [ELF1] 2-3 says that p_memsz must be at least as big as
p_filesz. */
if (phdr->p_memsz < phdr->p_filesz)