/* These are the functions used to load ELF style executables and shared
* libraries. There is no binary dependent code anywhere else.
*/
static int load_irix_binary(struct linux_binprm * bprm, struct pt_regs * regs)
{
struct elfhdr elf_ex, interp_elf_ex;
struct file *interpreter;
struct elf_phdr *elf_phdata, *elf_ihdr, *elf_ephdr;
unsigned int load_addr, elf_bss, elf_brk;
unsigned int elf_entry, interp_load_addr = 0;
unsigned int start_code, end_code, end_data, elf_stack;
int retval, has_interp, has_ephdr, size, i;
char *elf_interpreter;
mm_segment_t old_fs;
load_addr = 0;
has_interp = has_ephdr = 0;
elf_ihdr = elf_ephdr = NULL;
elf_ex = *((struct elfhdr *) bprm->buf);
retval = -ENOEXEC;
if (verify_binary(&elf_ex, bprm))
goto out;
/*
* Telling -o32 static binaries from Linux and Irix apart from each
* other is difficult. There are 2 differences to be noted for static
* binaries from the 2 operating systems:
*
* 1) Irix binaries have their .text section before their .init
* section. Linux binaries are just the opposite.
*
* 2) Irix binaries usually have <= 12 sections and Linux
* binaries have > 20.
*
* We will use Method #2 since Method #1 would require us to read in
* the section headers which is way too much overhead. This appears
* to work for everything we have ran into so far. If anyone has a
* better method to tell the binaries apart, I'm listening.
*/
if (elf_ex.e_shnum > 20)
goto out;
print_elfhdr(&elf_ex);
/* Now read in all of the header information */
size = elf_ex.e_phentsize * elf_ex.e_phnum;
if (size > 65536)
goto out;
elf_phdata = kmalloc(size, GFP_KERNEL);
if (elf_phdata == NULL) {
retval = -ENOMEM;
goto out;
}
retval = kernel_read(bprm->file, elf_ex.e_phoff, (char *)elf_phdata, size);
if (retval < 0)
goto out_free_ph;
dump_phdrs(elf_phdata, elf_ex.e_phnum);
/* Set some things for later. */
for (i = 0; i < elf_ex.e_phnum; i++) {
switch (elf_phdata[i].p_type) {
case PT_INTERP:
has_interp = 1;
elf_ihdr = &elf_phdata[i];
break;
case PT_PHDR:
has_ephdr = 1;
elf_ephdr = &elf_phdata[i];
break;
};
}
pr_debug("\n");
elf_bss = 0;
elf_brk = 0;
elf_stack = 0xffffffff;
elf_interpreter = NULL;
start_code = 0xffffffff;
end_code = 0;
end_data = 0;
/*
* If we get a return value, we change the value to be ENOEXEC
* so that we can exit gracefully and the main binary format
* search loop in 'fs/exec.c' will move onto the next handler
* which should be the normal ELF binary handler.
*/
retval = look_for_irix_interpreter(&elf_interpreter, &interpreter,
&interp_elf_ex, elf_phdata, bprm,
elf_ex.e_phnum);
if (retval) {
retval = -ENOEXEC;
goto out_free_file;
}
if (elf_interpreter) {
retval = verify_irix_interpreter(&interp_elf_ex);
if (retval)
goto out_free_interp;
}
/* OK, we are done with that, now set up the arg stuff,
* and then start this sucker up.
*/
retval = -E2BIG;
if (!bprm->sh_bang && !bprm->p)
goto out_free_interp;
/* Flush all traces of the currently running executable */
retval = flush_old_exec(bprm);
if (retval)
goto out_free_dentry;
/* OK, This is the point of no return */
current->mm->end_data = 0;
current->mm->end_code = 0;
current->mm->mmap = NULL;
current->flags &= ~PF_FORKNOEXEC;
elf_entry = (unsigned int) elf_ex.e_entry;
/* Do this so that we can load the interpreter, if need be. We will
* change some of these later.
*/
setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
current->mm->start_stack = bprm->p;
/* At this point, we assume that the image should be loaded at
* fixed address, not at a variable address.
*/
old_fs = get_fs();
set_fs(get_ds());
map_executable(bprm->file, elf_phdata, elf_ex.e_phnum, &elf_stack,
&load_addr, &start_code, &elf_bss, &end_code,
&end_data, &elf_brk);
if (elf_interpreter) {
retval = map_interpreter(elf_phdata, &interp_elf_ex,
interpreter, &interp_load_addr,
elf_ex.e_phnum, old_fs, &elf_entry);
kfree(elf_interpreter);
if (retval) {
set_fs(old_fs);
printk("Unable to load IRIX ELF interpreter\n");
send_sig(SIGSEGV, current, 0);
retval = 0;
goto out_free_file;
}
}
set_fs(old_fs);
kfree(elf_phdata);
set_personality(PER_IRIX32);
set_binfmt(&irix_format);
compute_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
bprm->p = (unsigned long)
create_irix_tables((char *)bprm->p, bprm->argc, bprm->envc,
(elf_interpreter ? &elf_ex : NULL),
load_addr, interp_load_addr, regs, elf_ephdr);
current->mm->start_brk = current->mm->brk = elf_brk;
current->mm->end_code = end_code;
current->mm->start_code = start_code;
current->mm->end_data = end_data;
current->mm->start_stack = bprm->p;
/* Calling set_brk effectively mmaps the pages that we need for the
* bss and break sections.
*/
set_brk(elf_bss, elf_brk);
/*
* IRIX maps a page at 0x200000 which holds some system
* information. Programs depend on this.
*/
irix_map_prda_page();
padzero(elf_bss);
pr_debug("(start_brk) %lx\n" , (long) current->mm->start_brk);
pr_debug("(end_code) %lx\n" , (long) current->mm->end_code);
pr_debug("(start_code) %lx\n" , (long) current->mm->start_code);
pr_debug("(end_data) %lx\n" , (long) current->mm->end_data);
pr_debug("(start_stack) %lx\n" , (long) current->mm->start_stack);
pr_debug("(brk) %lx\n" , (long) current->mm->brk);
#if 0 /* XXX No f*****g way dude... */
/* Why this, you ask??? Well SVr4 maps page 0 as read-only,
* and some applications "depend" upon this behavior.
* Since we do not have the power to recompile these, we
* emulate the SVr4 behavior. Sigh.
*/
down_write(¤t->mm->mmap_sem);
(void) do_mmap(NULL, 0, 4096, PROT_READ | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE, 0);
up_write(¤t->mm->mmap_sem);
#endif
start_thread(regs, elf_entry, bprm->p);
if (current->ptrace & PT_PTRACED)
send_sig(SIGTRAP, current, 0);
return 0;
out:
return retval;
out_free_dentry:
allow_write_access(interpreter);
fput(interpreter);
out_free_interp:
kfree(elf_interpreter);
out_free_file:
out_free_ph:
kfree(elf_phdata);
goto out;
}
/* These are the functions used to load ELF style executables and shared
* libraries. There is no binary dependent code anywhere else.
*/
static int load_irix_binary(struct linux_binprm * bprm, struct pt_regs * regs)
{
struct elfhdr elf_ex, interp_elf_ex;
struct file *interpreter;
struct elf_phdr *elf_phdata, *elf_ihdr, *elf_ephdr;
unsigned int load_addr, elf_bss, elf_brk;
unsigned int elf_entry, interp_load_addr = 0;
unsigned int start_code, end_code, end_data, elf_stack;
int retval, has_interp, has_ephdr, size, i;
char *elf_interpreter;
mm_segment_t old_fs;
load_addr = 0;
has_interp = has_ephdr = 0;
elf_ihdr = elf_ephdr = 0;
elf_ex = *((struct elfhdr *) bprm->buf);
retval = -ENOEXEC;
if (verify_binary(&elf_ex, bprm))
goto out;
#ifdef DEBUG_ELF
print_elfhdr(&elf_ex);
#endif
/* Now read in all of the header information */
size = elf_ex.e_phentsize * elf_ex.e_phnum;
if (size > 65536)
goto out;
elf_phdata = (struct elf_phdr *) kmalloc(size, GFP_KERNEL);
if (elf_phdata == NULL) {
retval = -ENOMEM;
goto out;
}
retval = kernel_read(bprm->file, elf_ex.e_phoff, (char *)elf_phdata, size);
if (retval < 0)
goto out_free_ph;
#ifdef DEBUG_ELF
dump_phdrs(elf_phdata, elf_ex.e_phnum);
#endif
/* Set some things for later. */
for(i = 0; i < elf_ex.e_phnum; i++) {
switch(elf_phdata[i].p_type) {
case PT_INTERP:
has_interp = 1;
elf_ihdr = &elf_phdata[i];
break;
case PT_PHDR:
has_ephdr = 1;
elf_ephdr = &elf_phdata[i];
break;
};
}
#ifdef DEBUG_ELF
printk("\n");
#endif
elf_bss = 0;
elf_brk = 0;
elf_stack = 0xffffffff;
elf_interpreter = NULL;
start_code = 0xffffffff;
end_code = 0;
end_data = 0;
retval = look_for_irix_interpreter(&elf_interpreter,
&interpreter,
&interp_elf_ex, elf_phdata, bprm,
elf_ex.e_phnum);
if (retval)
goto out_free_file;
if (elf_interpreter) {
retval = verify_irix_interpreter(&interp_elf_ex);
if(retval)
goto out_free_interp;
}
/* OK, we are done with that, now set up the arg stuff,
* and then start this sucker up.
*/
retval = -E2BIG;
if (!bprm->sh_bang && !bprm->p)
goto out_free_interp;
/* Flush all traces of the currently running executable */
retval = flush_old_exec(bprm);
if (retval)
goto out_free_dentry;
/* OK, This is the point of no return */
current->mm->end_data = 0;
current->mm->end_code = 0;
current->mm->mmap = NULL;
current->flags &= ~PF_FORKNOEXEC;
elf_entry = (unsigned int) elf_ex.e_entry;
/* Do this so that we can load the interpreter, if need be. We will
* change some of these later.
*/
current->mm->rss = 0;
setup_arg_pages(bprm);
current->mm->start_stack = bprm->p;
/* At this point, we assume that the image should be loaded at
* fixed address, not at a variable address.
*/
old_fs = get_fs();
set_fs(get_ds());
map_executable(bprm->file, elf_phdata, elf_ex.e_phnum, &elf_stack,
&load_addr, &start_code, &elf_bss, &end_code,
&end_data, &elf_brk);
if(elf_interpreter) {
retval = map_interpreter(elf_phdata, &interp_elf_ex,
interpreter, &interp_load_addr,
elf_ex.e_phnum, old_fs, &elf_entry);
kfree(elf_interpreter);
if(retval) {
set_fs(old_fs);
printk("Unable to load IRIX ELF interpreter\n");
send_sig(SIGSEGV, current, 0);
retval = 0;
goto out_free_file;
}
}
set_fs(old_fs);
kfree(elf_phdata);
set_personality(PER_IRIX32);
set_binfmt(&irix_format);
compute_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
bprm->p = (unsigned long)
create_irix_tables((char *)bprm->p, bprm->argc, bprm->envc,
(elf_interpreter ? &elf_ex : NULL),
load_addr, interp_load_addr, regs, elf_ephdr);
current->mm->start_brk = current->mm->brk = elf_brk;
current->mm->end_code = end_code;
current->mm->start_code = start_code;
current->mm->end_data = end_data;
current->mm->start_stack = bprm->p;
/* Calling set_brk effectively mmaps the pages that we need for the
* bss and break sections.
*/
set_brk(elf_bss, elf_brk);
/*
* IRIX maps a page at 0x200000 which holds some system
* information. Programs depend on this.
*/
irix_map_prda_page ();
padzero(elf_bss);
#ifdef DEBUG_ELF
printk("(start_brk) %lx\n" , (long) current->mm->start_brk);
printk("(end_code) %lx\n" , (long) current->mm->end_code);
printk("(start_code) %lx\n" , (long) current->mm->start_code);
printk("(end_data) %lx\n" , (long) current->mm->end_data);
printk("(start_stack) %lx\n" , (long) current->mm->start_stack);
printk("(brk) %lx\n" , (long) current->mm->brk);
#endif
#if 0 /* XXX No f*****g way dude... */
/* Why this, you ask??? Well SVr4 maps page 0 as read-only,
* and some applications "depend" upon this behavior.
* Since we do not have the power to recompile these, we
* emulate the SVr4 behavior. Sigh.
*/
down_write(¤t->mm->mmap_sem);
(void) do_mmap(NULL, 0, 4096, PROT_READ | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE, 0);
up_write(¤t->mm->mmap_sem);
#endif
start_thread(regs, elf_entry, bprm->p);
if (current->ptrace & PT_PTRACED)
send_sig(SIGTRAP, current, 0);
return 0;
out:
return retval;
out_free_dentry:
allow_write_access(interpreter);
fput(interpreter);
out_free_interp:
if (elf_interpreter)
kfree(elf_interpreter);
out_free_file:
out_free_ph:
kfree (elf_phdata);
goto out;
}