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Update.
[pintos-anon]
/
src
/
userprog
/
process.c
diff --git
a/src/userprog/process.c
b/src/userprog/process.c
index 78b3122b1b6e1dcb1db9ce12d804e46383785a71..88c9d8dcae20995bb5e7dc3b4b2d5a42ca5b8e6e 100644
(file)
--- a/
src/userprog/process.c
+++ b/
src/userprog/process.c
@@
-54,6
+54,8
@@
execute_thread (void *filename_)
/* Initialize interrupt frame and load executable. */
memset (&if_, 0, sizeof if_);
/* 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;
if_.es = SEL_UDSEG;
if_.ds = SEL_UDSEG;
if_.cs = SEL_UCSEG;
@@
-71,14
+73,11
@@
execute_thread (void *filename_)
/* Start the user process by simulating a return from an
interrupt, implemented by intr_exit (in
/* Start the user process by simulating a return from an
interrupt, implemented by intr_exit (in
- threads/intr-stubs.
pl
). Because intr_exit takes all of its
+ threads/intr-stubs.
S
). Because intr_exit takes all of its
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. */
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 ();
}
NOT_REACHED ();
}
@@
-240,7
+239,10
@@
load (const char *filename, void (**eip) (void), void **esp)
{
struct Elf32_Phdr phdr;
{
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);
file_seek (file, file_ofs);
+
if (file_read (file, &phdr, sizeof phdr) != sizeof phdr)
LOAD_ERROR (("error reading program header"));
file_ofs += sizeof phdr;
if (file_read (file, &phdr, sizeof phdr) != sizeof phdr)
LOAD_ERROR (("error reading program header"));
file_ofs += sizeof phdr;
@@
-316,6
+318,13
@@
load_segment (struct file *file, const struct Elf32_Phdr *phdr)
return false;
}
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)
/* [ELF1] 2-3 says that p_memsz must be at least as big as
p_filesz. */
if (phdr->p_memsz < phdr->p_filesz)