static int load_fn_binary(struct linux_binprm * bprm, struct pt_regs * regs)
{
unsigned long p = bprm->p;
unsigned long stack_len;
unsigned long start_addr;
unsigned long *sp;
unsigned long i;
int res;
/*
* We have to add the size of our arguments to our stack size
* otherwise it's too easy for users to create stack overflows
* by passing in a huge argument list. And yes, we have to be
* pedantic and include space for the argv/envp array as it may have
* a lot of entries.
*/
#define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *))
stack_len = TOP_OF_ARGS - bprm->p; /* the strings */
stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */
stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */
res = load_fn_file(bprm, &stack_len);
if (res > (unsigned long)-4096)
return res;
compute_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
set_binfmt(&fn_format);
p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
/* copy the arg pages onto the stack, this could be more efficient :-) */
for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--)
* (char *) --p =
((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE];
sp = (unsigned long *) create_fn_tables(p, bprm);
start_addr = (unsigned long)bprm->filename;
/* Stash our initial stack pointer into the mm structure */
current->mm->start_stack = (unsigned long )sp;
regs->r6=start_addr;
start_thread(regs, (unsigned long)&userapp_start, current->mm->start_stack);
if (current->ptrace & PT_PTRACED)
send_sig(SIGTRAP, current, 0);
return 0;
}
static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
{
struct file *interpreter = NULL; /* to shut gcc up */
unsigned long load_addr = 0, load_bias = 0;
int load_addr_set = 0;
char * elf_interpreter = NULL;
unsigned int interpreter_type = INTERPRETER_NONE;
unsigned char ibcs2_interpreter = 0;
unsigned long error;
struct elf_phdr * elf_ppnt, *elf_phdata;
unsigned long elf_bss, k, elf_brk;
int elf_exec_fileno;
int retval, i;
unsigned int size;
unsigned long elf_entry, interp_load_addr = 0;
unsigned long start_code, end_code, start_data, end_data;
unsigned long reloc_func_desc = 0;
struct elfhdr elf_ex;
struct elfhdr interp_elf_ex;
struct exec interp_ex;
char passed_fileno[6];
struct files_struct *files;
/* Get the exec-header */
elf_ex = *((struct elfhdr *) bprm->buf);
retval = -ENOEXEC;
/* First of all, some simple consistency checks */
if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
goto out;
if (elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN)
goto out;
if (!elf_check_arch(&elf_ex))
goto out;
if (!bprm->file->f_op||!bprm->file->f_op->mmap)
goto out;
/* Now read in all of the header information */
if (elf_ex.e_phentsize != sizeof(struct elf_phdr))
goto out;
if (elf_ex.e_phnum < 1 ||
elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr))
goto out;
size = elf_ex.e_phnum * sizeof(struct elf_phdr);
retval = -ENOMEM;
elf_phdata = (struct elf_phdr *) kmalloc(size, GFP_KERNEL);
if (!elf_phdata)
goto out;
retval = kernel_read(bprm->file, elf_ex.e_phoff, (char *) elf_phdata, size);
if (retval != size) {
if (retval >= 0)
retval = -EIO;
goto out_free_ph;
}
files = current->files; /* Refcounted so ok */
retval = unshare_files();
if (retval < 0)
goto out_free_ph;
if (files == current->files) {
put_files_struct(files);
files = NULL;
}
/* exec will make our files private anyway, but for the a.out
loader stuff we need to do it earlier */
retval = get_unused_fd();
if (retval < 0)
goto out_free_fh;
get_file(bprm->file);
fd_install(elf_exec_fileno = retval, bprm->file);
elf_ppnt = elf_phdata;
elf_bss = 0;
elf_brk = 0;
start_code = ~0UL;
end_code = 0;
start_data = 0;
end_data = 0;
for (i = 0; i < 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_file;
retval = -ENOMEM;
elf_interpreter = (char *) kmalloc(elf_ppnt->p_filesz,
GFP_KERNEL);
if (!elf_interpreter)
goto out_free_file;
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;
/* If the program interpreter is one of these two,
* then assume an iBCS2 image. Otherwise assume
* a native linux image.
*/
if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0)
ibcs2_interpreter = 1;
#if 0
printk("Using ELF interpreter %s\n", elf_interpreter);
#endif
SET_PERSONALITY(elf_ex, ibcs2_interpreter);
interpreter = open_exec(elf_interpreter);
retval = PTR_ERR(interpreter);
if (IS_ERR(interpreter))
goto out_free_interp;
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 */
interp_ex = *((struct exec *) bprm->buf);
interp_elf_ex = *((struct elfhdr *) bprm->buf);
break;
}
elf_ppnt++;
}
/* Some simple consistency checks for the interpreter */
if (elf_interpreter) {
interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
/* Now figure out which format our binary is */
if ((N_MAGIC(interp_ex) != OMAGIC) &&
(N_MAGIC(interp_ex) != ZMAGIC) &&
(N_MAGIC(interp_ex) != QMAGIC))
interpreter_type = INTERPRETER_ELF;
if (memcmp(interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
interpreter_type &= ~INTERPRETER_ELF;
retval = -ELIBBAD;
if (!interpreter_type)
goto out_free_dentry;
/* Make sure only one type was selected */
if ((interpreter_type & INTERPRETER_ELF) &&
interpreter_type != INTERPRETER_ELF) {
// FIXME - ratelimit this before re-enabling
// printk(KERN_WARNING "ELF: Ambiguous type, using ELF\n");
interpreter_type = INTERPRETER_ELF;
}
/* Verify the interpreter has a valid arch */
if ((interpreter_type == INTERPRETER_ELF) &&
!elf_check_arch(&interp_elf_ex))
goto out_free_dentry;
} else {
/* Executables without an interpreter also need a personality */
SET_PERSONALITY(elf_ex, ibcs2_interpreter);
}
/* OK, we are done with that, now set up the arg stuff,
and then start this sucker up */
if (!bprm->sh_bang) {
char * passed_p;
if (interpreter_type == INTERPRETER_AOUT) {
sprintf(passed_fileno, "%d", elf_exec_fileno);
passed_p = passed_fileno;
if (elf_interpreter) {
retval = copy_strings_kernel(1,&passed_p,bprm);
if (retval)
goto out_free_dentry;
bprm->argc++;
}
}
} else {
/* Executables without an interpreter also need a personality */
SET_PERSONALITY(elf_ex, ibcs2_interpreter);
}
/* Flush all traces of the currently running executable */
retval = flush_old_exec(bprm);
if (retval)
goto out_free_dentry;
/* Discard our unneeded old files struct */
if (files) {
steal_locks(files);
put_files_struct(files);
files = NULL;
}
/* OK, This is the point of no return */
current->mm->start_data = 0;
current->mm->end_data = 0;
current->mm->end_code = 0;
current->mm->mmap = NULL;
current->flags &= ~PF_FORKNOEXEC;
elf_entry = (unsigned long) 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;
retval = setup_arg_pages(bprm);
if (retval < 0) {
send_sig(SIGKILL, current, 0);
return retval;
}
current->mm->start_stack = bprm->p;
/* Now we do a little grungy work by mmaping the ELF image into
the correct location in memory. At this point, we assume that
the image should be loaded at fixed address, not at a variable
address. */
for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) {
int elf_prot = 0, elf_flags;
unsigned long vaddr;
if (elf_ppnt->p_type != PT_LOAD)
continue;
if (unlikely (elf_brk > elf_bss)) {
unsigned long nbyte;
/* There was a PT_LOAD segment with p_memsz > p_filesz
before this one. Map anonymous pages, if needed,
and clear the area. */
retval = set_brk (elf_bss + load_bias,
elf_brk + load_bias);
if (retval) {
send_sig(SIGKILL, current, 0);
goto out_free_dentry;
}
nbyte = ELF_PAGEOFFSET(elf_bss);
if (nbyte) {
nbyte = ELF_MIN_ALIGN - nbyte;
if (nbyte > elf_brk - elf_bss)
nbyte = elf_brk - elf_bss;
clear_user((void *) elf_bss + load_bias, nbyte);
}
}
if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
elf_flags = MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
vaddr = elf_ppnt->p_vaddr;
if (elf_ex.e_type == ET_EXEC || load_addr_set) {
elf_flags |= MAP_FIXED;
} else if (elf_ex.e_type == ET_DYN) {
/* Try and get dynamic programs out of the way of the default mmap
base, as well as whatever program they might try to exec. This
is because the brk will follow the loader, and is not movable. */
load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
}
error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, elf_prot, elf_flags);
if (BAD_ADDR(error)) {
send_sig(SIGKILL, current, 0);
goto out_free_dentry;
}
if (!load_addr_set) {
load_addr_set = 1;
load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
if (elf_ex.e_type == ET_DYN) {
load_bias += error -
ELF_PAGESTART(load_bias + vaddr);
load_addr += load_bias;
reloc_func_desc = load_addr;
}
}
k = elf_ppnt->p_vaddr;
if (k < start_code) start_code = k;
if (start_data < k) start_data = k;
/*
* Check to see if the section's size will overflow the
* allowed task size. Note that p_filesz must always be
* <= p_memsz so it is only necessary to check p_memsz.
*/
if (k > TASK_SIZE || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
elf_ppnt->p_memsz > TASK_SIZE ||
TASK_SIZE - elf_ppnt->p_memsz < k) {
/* set_brk can never work. Avoid overflows. */
send_sig(SIGKILL, current, 0);
goto out_free_dentry;
}
k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
if (k > elf_bss)
elf_bss = k;
if ((elf_ppnt->p_flags & PF_X) && end_code < k)
end_code = k;
if (end_data < k)
end_data = k;
k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
if (k > elf_brk)
elf_brk = k;
}
elf_entry += load_bias;
elf_bss += load_bias;
elf_brk += load_bias;
start_code += load_bias;
end_code += load_bias;
start_data += load_bias;
end_data += load_bias;
/* Calling set_brk effectively mmaps the pages that we need
* for the bss and break sections. We must do this before
* mapping in the interpreter, to make sure it doesn't wind
* up getting placed where the bss needs to go.
*/
retval = set_brk(elf_bss, elf_brk);
if (retval) {
send_sig(SIGKILL, current, 0);
goto out_free_dentry;
}
padzero(elf_bss);
if (elf_interpreter) {
if (interpreter_type == INTERPRETER_AOUT)
elf_entry = load_aout_interp(&interp_ex,
interpreter);
else
elf_entry = load_elf_interp(&interp_elf_ex,
interpreter,
&interp_load_addr);
if (BAD_ADDR(elf_entry)) {
printk(KERN_ERR "Unable to load interpreter %.128s\n",
elf_interpreter);
force_sig(SIGSEGV, current);
retval = -ENOEXEC; /* Nobody gets to see this, but.. */
goto out_free_dentry;
}
reloc_func_desc = interp_load_addr;
allow_write_access(interpreter);
fput(interpreter);
kfree(elf_interpreter);
}
kfree(elf_phdata);
if (interpreter_type != INTERPRETER_AOUT)
sys_close(elf_exec_fileno);
set_binfmt(&elf_format);
compute_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
bprm->p = (unsigned long)
create_elf_tables((char *)bprm->p,
bprm->argc,
bprm->envc,
&elf_ex,
load_addr, load_bias,
interp_load_addr,
(interpreter_type == INTERPRETER_AOUT ? 0 : 1));
/* N.B. passed_fileno might not be initialized? */
if (interpreter_type == INTERPRETER_AOUT)
current->mm->arg_start += strlen(passed_fileno) + 1;
current->mm->start_brk = current->mm->brk = elf_brk;
current->mm->end_code = end_code;
current->mm->start_code = start_code;
current->mm->start_data = start_data;
current->mm->end_data = end_data;
current->mm->start_stack = bprm->p;
#if 0
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("(start_data) %lx\n" , (long) current->mm->start_data);
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 (current->personality & MMAP_PAGE_ZERO) {
/* 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. */
/* N.B. Shouldn't the size here be PAGE_SIZE?? */
down_write(¤t->mm->mmap_sem);
error = do_mmap(NULL, 0, 4096, PROT_READ | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE, 0);
up_write(¤t->mm->mmap_sem);
}
#ifdef ELF_PLAT_INIT
/*
* The ABI may specify that certain registers be set up in special
* ways (on i386 %edx is the address of a DT_FINI function, for
* example. In addition, it may also specify (eg, PowerPC64 ELF)
* that the e_entry field is the address of the function descriptor
* for the startup routine, rather than the address of the startup
* routine itself. This macro performs whatever initialization to
* the regs structure is required as well as any relocations to the
* function descriptor entries when executing dynamically linked apps.
*/
ELF_PLAT_INIT(regs, reloc_func_desc);
#endif
start_thread(regs, elf_entry, bprm->p);
if (current->ptrace & PT_PTRACED)
send_sig(SIGTRAP, current, 0);
retval = 0;
out:
return retval;
/* error cleanup */
out_free_dentry:
allow_write_access(interpreter);
if (interpreter)
fput(interpreter);
out_free_interp:
if (elf_interpreter)
kfree(elf_interpreter);
out_free_file:
sys_close(elf_exec_fileno);
out_free_fh:
if (files) {
put_files_struct(current->files);
current->files = files;
}
out_free_ph:
kfree(elf_phdata);
goto out;
}
static int load_aout32_binary(struct linux_binprm * bprm, struct pt_regs * regs)
{
struct exec ex;
unsigned long error;
unsigned long fd_offset;
unsigned long rlim;
unsigned long orig_thr_flags;
int retval;
ex = *((struct exec *) bprm->buf); /* exec-header */
if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
N_TRSIZE(ex) || N_DRSIZE(ex) ||
bprm->file->f_path.dentry->d_inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
return -ENOEXEC;
}
fd_offset = N_TXTOFF(ex);
/* Check initial limits. This avoids letting people circumvent
* size limits imposed on them by creating programs with large
* arrays in the data or bss.
*/
rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
if (rlim >= RLIM_INFINITY)
rlim = ~0;
if (ex.a_data + ex.a_bss > rlim)
return -ENOMEM;
/* Flush all traces of the currently running executable */
retval = flush_old_exec(bprm);
if (retval)
return retval;
/* OK, This is the point of no return */
set_personality(PER_SUNOS);
current->mm->end_code = ex.a_text +
(current->mm->start_code = N_TXTADDR(ex));
current->mm->end_data = ex.a_data +
(current->mm->start_data = N_DATADDR(ex));
current->mm->brk = ex.a_bss +
(current->mm->start_brk = N_BSSADDR(ex));
current->mm->free_area_cache = current->mm->mmap_base;
current->mm->cached_hole_size = 0;
current->mm->mmap = NULL;
compute_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
if (N_MAGIC(ex) == NMAGIC) {
loff_t pos = fd_offset;
/* F**k me plenty... */
down_write(¤t->mm->mmap_sem);
error = do_brk(N_TXTADDR(ex), ex.a_text);
up_write(¤t->mm->mmap_sem);
bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
ex.a_text, &pos);
down_write(¤t->mm->mmap_sem);
error = do_brk(N_DATADDR(ex), ex.a_data);
up_write(¤t->mm->mmap_sem);
bprm->file->f_op->read(bprm->file, (char __user *)N_DATADDR(ex),
ex.a_data, &pos);
goto beyond_if;
}
if (N_MAGIC(ex) == OMAGIC) {
loff_t pos = fd_offset;
down_write(¤t->mm->mmap_sem);
do_brk(N_TXTADDR(ex) & PAGE_MASK,
ex.a_text+ex.a_data + PAGE_SIZE - 1);
up_write(¤t->mm->mmap_sem);
bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
ex.a_text+ex.a_data, &pos);
} else {
static unsigned long error_time;
if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
(N_MAGIC(ex) != NMAGIC) && (jiffies-error_time) > 5*HZ)
{
printk(KERN_NOTICE "executable not page aligned\n");
error_time = jiffies;
}
if (!bprm->file->f_op->mmap) {
loff_t pos = fd_offset;
down_write(¤t->mm->mmap_sem);
do_brk(0, ex.a_text+ex.a_data);
up_write(¤t->mm->mmap_sem);
bprm->file->f_op->read(bprm->file,
(char __user *)N_TXTADDR(ex),
ex.a_text+ex.a_data, &pos);
goto beyond_if;
}
down_write(¤t->mm->mmap_sem);
error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
PROT_READ | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
fd_offset);
up_write(¤t->mm->mmap_sem);
if (error != N_TXTADDR(ex)) {
send_sig(SIGKILL, current, 0);
return error;
}
down_write(¤t->mm->mmap_sem);
error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
fd_offset + ex.a_text);
up_write(¤t->mm->mmap_sem);
if (error != N_DATADDR(ex)) {
send_sig(SIGKILL, current, 0);
return error;
}
}
beyond_if:
set_binfmt(&aout32_format);
set_brk(current->mm->start_brk, current->mm->brk);
/* Make sure STACK_TOP returns the right thing. */
orig_thr_flags = current_thread_info()->flags;
current_thread_info()->flags |= _TIF_32BIT;
retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
if (retval < 0) {
current_thread_info()->flags = orig_thr_flags;
/* Someone check-me: is this error path enough? */
send_sig(SIGKILL, current, 0);
return retval;
}
current->mm->start_stack =
(unsigned long) create_aout32_tables((char __user *)bprm->p, bprm);
tsb_context_switch(current->mm);
start_thread32(regs, ex.a_entry, current->mm->start_stack);
if (current->ptrace & PT_PTRACED)
send_sig(SIGTRAP, current, 0);
return 0;
}
/*
* Helper function to process the load operation.
*/
static int
xout_load_object(struct linux_binprm * bpp, struct pt_regs *rp, int executable)
{
struct xexec *xexec = (struct xexec *)bpp->buf;
struct xext *xext = (struct xext *)(xexec + 1);
struct xseg *seglist;
struct file *fp = NULL;
u_long addr, lPers;
int nsegs, ntext, ndata;
int pageable = 1, err = 0, i;
#ifdef CONFIG_BINFMT_XOUT_X286
struct file *file;
#endif
lPers = abi_personality((char *)_BX(rp));
if (lPers == 0) lPers = PER_XENIX;
if (xexec->x_magic != X_MAGIC) {
return -ENOEXEC;
}
switch (xexec->x_cpu & XC_CPU) {
case XC_386:
break;
#if defined(CONFIG_BINFMT_XOUT_X286)
case XC_8086:
case XC_286:
case XC_286V:
case XC_186:
if (!Emulx286) return -ENOEXEC;
file = open_exec(Emulx286);
if (file) {
fput(bpp->file);
bpp->file = file;
kernel_read(bpp->file, 0L, bpp->buf, sizeof(bpp->buf));
}
return -ENOEXEC;
#endif
default:
dprintk(KERN_DEBUG "xout: unsupported CPU type (%02x)\n",
xexec->x_cpu);
return -ENOEXEC;
}
/*
* We can't handle byte or word swapped headers. Well, we
* *could* but they should never happen surely?
*/
if ((xexec->x_cpu & (XC_BSWAP | XC_WSWAP)) != XC_WSWAP) {
dprintk(KERN_DEBUG "xout: wrong byte or word sex (%02x)\n",
xexec->x_cpu);
return -ENOEXEC;
}
/* Check it's an executable. */
if (!(xexec->x_renv & XE_EXEC)) {
dprintk(KERN_DEBUG "xout: not executable\n");
return -ENOEXEC;
}
/*
* There should be an extended header and there should be
* some segments. At this stage we don't handle non-segmented
* binaries. I'm not sure you can get them under Xenix anyway.
*/
if (xexec->x_ext != sizeof(struct xext)) {
dprintk(KERN_DEBUG "xout: bad extended header\n");
return -ENOEXEC;
}
if (!(xexec->x_renv & XE_SEG) || !xext->xe_segsize) {
dprintk(KERN_DEBUG "xout: not segmented\n");
return -ENOEXEC;
}
if (!(seglist = kmalloc(xext->xe_segsize, GFP_KERNEL))) {
printk(KERN_WARNING "xout: allocating segment list failed\n");
return -ENOMEM;
}
err = kernel_read(bpp->file, xext->xe_segpos,
(char *)seglist, xext->xe_segsize);
if (err < 0) {
dprintk(KERN_DEBUG "xout: problem reading segment table\n");
goto out;
}
if (!bpp->file->f_op->mmap)
pageable = 0;
nsegs = xext->xe_segsize / sizeof(struct xseg);
ntext = ndata = 0;
for (i = 0; i < nsegs; i++) {
switch (seglist[i].xs_type) {
case XS_TTEXT:
if (isnotaligned(seglist+i))
pageable = 0;
ntext++;
break;
case XS_TDATA:
if (isnotaligned(seglist+i))
pageable = 0;
ndata++;
break;
}
}
if (!ndata)
goto out;
/*
* Generate the proper values for the text fields
*
* THIS IS THE POINT OF NO RETURN. THE NEW PROCESS WILL TRAP OUT SHOULD
* SOMETHING FAIL IN THE LOAD SEQUENCE FROM THIS POINT ONWARD.
*/
/*
* Flush the executable from memory. At this point the executable is
* committed to being defined or a segmentation violation will occur.
*/
if (executable) {
dprintk(KERN_DEBUG "xout: flushing executable\n");
flush_old_exec(bpp);
if ( (lPers & 0xFF) == (current->personality & 0xFF) ) set_personality(0);
set_personality(lPers);
#if defined(CONFIG_ABI_TRACE)
abi_trace(ABI_TRACE_UNIMPL, "Personality %08X assigned\n",
(unsigned int)current->personality);
#endif
#ifdef CONFIG_64BIT
set_thread_flag(TIF_IA32);
clear_thread_flag(TIF_ABI_PENDING);
#endif
current->mm->mmap = NULL;
#ifdef set_mm_counter
#if _KSL > 14
set_mm_counter(current->mm, file_rss, 0);
#else
set_mm_counter(current->mm, rss, 0);
#endif
#else
current->mm->rss = 0;
#endif
#if _KSL > 10
if ((err = setup_arg_pages(bpp, STACK_TOP, EXSTACK_DEFAULT)) < 0)
#else
if ((err = setup_arg_pages(bpp, EXSTACK_DEFAULT)) < 0)
#endif
{
send_sig(SIGSEGV, current, 1);
return (err);
}
bpp->p = (u_long)xout_create_tables((char *)bpp->p, bpp,
(xexec->x_cpu & XC_CPU) == XC_386 ? 1 : 0);
current->mm->start_code = 0;
current->mm->end_code = xexec->x_text;
current->mm->end_data = xexec->x_text + xexec->x_data;
current->mm->start_brk =
current->mm->brk = xexec->x_text + xexec->x_data + xexec->x_bss;
#if _KSL > 28
install_exec_creds(bpp);
#else
compute_creds(bpp);
#endif
current->flags &= ~PF_FORKNOEXEC;
#if _KSL < 15
#ifdef CONFIG_64BIT
__asm__ volatile (
"movl %0,%%fs; movl %0,%%es; movl %0,%%ds"
: :"r" (0));
__asm__ volatile (
"pushf; cli; swapgs; movl %0,%%gs; mfence; swapgs; popf"
: :"r" (0));
write_pda(oldrsp,bpp->p);
_FLG(rp) = 0x200;
#else
__asm__ volatile (
"movl %0,%%fs ; movl %0,%%gs"
: :"r" (0));
_DS(rp) = _ES(rp) = __USER_DS;
#endif
_SS(rp) = __USER_DS;
_SP(rp) = bpp->p;
_CS(rp) = __USER_CS;
_IP(rp) = xexec->x_entry;
set_fs(USER_DS);
#else
start_thread(rp, xexec->x_entry, bpp->p);
#endif
#ifdef CONFIG_64BIT
__asm__ volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS));
_SS(rp) = __USER32_DS;
_CS(rp) = __USER32_CS;
#endif
dprintk(KERN_DEBUG "xout: entry point = 0x%x:0x%08lx\n",
xext->xe_eseg, xexec->x_entry);
}
/*
* Scan the segments and map them into the process space. If this
* executable is pageable (unlikely since Xenix aligns to 1k
* boundaries and we want it aligned to 4k boundaries) this is
* all we need to do. If it isn't pageable we go round again
* afterwards and load the data. We have to do this in two steps
* because if segments overlap within a 4K page we'll lose the
* first instance when we remap the page. Hope that's clear...
*/
for (i = 0; err >= 0 && i < nsegs; i++) {
struct xseg *sp = seglist+i;
if (sp->xs_attr & XS_AMEM) {
err = xout_amen(fp, sp, pageable, &addr,
xexec, rp, (!ntext && ndata == 1));
}
}
/*
* We better fix start_data because sys_brk looks there to
* calculate data size.
* Kernel 2.2 did look at end_code so this is reasonable.
*/
if (current->mm->start_data == current->mm->start_code)
current->mm->start_data = current->mm->end_code;
dprintk(KERN_DEBUG "xout: start code 0x%08lx, end code 0x%08lx,"
" start data 0x%08lx, end data 0x%08lx, brk 0x%08lx\n",
current->mm->start_code, current->mm->end_code,
current->mm->start_data, current->mm->end_data,
current->mm->brk);
if (pageable)
goto trap;
if (err < 0)
goto trap;
for (i = 0; (err >= 0) && (i < nsegs); i++) {
struct xseg *sp = seglist + i;
u_long psize;
if (sp->xs_type == XS_TTEXT || sp->xs_type == XS_TDATA) {
dprintk(KERN_DEBUG "xout: read to 0x%08lx from 0x%08lx,"
" length 0x%8lx\n", sp->xs_rbase,
sp->xs_filpos, sp->xs_psize);
if (sp->xs_psize < 0)
continue;
/*
* Do we still get the size ? Yes! [joerg]
*/
psize = kernel_read(bpp->file, sp->xs_filpos,
(char *)((long)sp->xs_rbase), sp->xs_psize);
if (psize != sp->xs_psize) {
dprintk(KERN_DEBUG "xout: short read 0x%8lx\n",psize);
err = -1;
break;
}
}
}
/*
* Generate any needed trap for this process. If an error occured then
* generate a segmentation violation. If the process is being debugged
* then generate the load trap. (Note: If this is a library load then
* do not generate the trap here. Pass the error to the caller who
* will do it for the process in the outer lay of this procedure call.)
*/
trap:
if (executable) {
if (err < 0) {
dprintk(KERN_DEBUG "xout: loader forces seg fault "
"(err = %d)\n", err);
send_sig(SIGSEGV, current, 0);
}
#ifdef CONFIG_PTRACE
/* --- Red Hat specific handling --- */
#else
else if (current->ptrace & PT_PTRACED)
send_sig(SIGTRAP, current, 0);
#endif
err = 0;
}
out:
kfree(seglist);
dprintk(KERN_DEBUG "xout: binfmt_xout: result = %d\n", err);
/*
* If we are using the [2]86 emulation overlay we enter this
* rather than the real program and give it the information
* it needs to start the ball rolling.
*/
/*
* Xenix 386 programs expect the initial brk value to be in eax
* on start up. Hence if we succeeded we need to pass back
* the brk value rather than the status. Ultimately the
* ret_from_sys_call assembly will place this in eax before
* resuming (starting) the process.
*/
return (err < 0 ? err : current->mm->brk);
}
/* 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;
}
static int CVE_2010_0307_linux2_6_27_31_load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
{
struct file *interpreter = NULL; /* to shut gcc up */
unsigned long load_addr = 0, load_bias = 0;
int load_addr_set = 0;
char * elf_interpreter = NULL;
unsigned long error;
struct elf_phdr *elf_ppnt, *elf_phdata;
unsigned long elf_bss, elf_brk;
int elf_exec_fileno;
int retval, i;
unsigned int size;
unsigned long elf_entry;
unsigned long interp_load_addr = 0;
unsigned long start_code, end_code, start_data, end_data;
unsigned long reloc_func_desc = 0;
int executable_stack = EXSTACK_DEFAULT;
unsigned long def_flags = 0;
struct {
struct elfhdr elf_ex;
struct elfhdr interp_elf_ex;
} *loc;
loc = kmalloc(sizeof(*loc), GFP_KERNEL);
if (!loc) {
retval = -ENOMEM;
goto out_ret;
}
/* Get the exec-header */
loc->elf_ex = *((struct elfhdr *)bprm->buf);
retval = -ENOEXEC;
/* First of all, some simple consistency checks */
if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
goto out;
if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
goto out;
if (!elf_check_arch(&loc->elf_ex))
goto out;
if (!bprm->file->f_op||!bprm->file->f_op->mmap)
goto out;
/* Now read in all of the header information */
if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr))
goto out;
if (loc->elf_ex.e_phnum < 1 ||
loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr))
goto out;
size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr);
retval = -ENOMEM;
elf_phdata = kmalloc(size, GFP_KERNEL);
if (!elf_phdata)
goto out;
retval = kernel_read(bprm->file, loc->elf_ex.e_phoff,
(char *)elf_phdata, size);
if (retval != size) {
if (retval >= 0)
retval = -EIO;
goto out_free_ph;
}
retval = get_unused_fd();
if (retval < 0)
goto out_free_ph;
get_file(bprm->file);
fd_install(elf_exec_fileno = retval, bprm->file);
elf_ppnt = elf_phdata;
elf_bss = 0;
elf_brk = 0;
start_code = ~0UL;
end_code = 0;
start_data = 0;
end_data = 0;
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_file;
retval = -ENOMEM;
elf_interpreter = kmalloc(elf_ppnt->p_filesz,
GFP_KERNEL);
if (!elf_interpreter)
goto out_free_file;
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;
/*
* The early SET_PERSONALITY here is so that the lookup
* for the interpreter happens in the namespace of the
* to-be-execed image. SET_PERSONALITY can select an
* alternate root.
*
* However, SET_PERSONALITY is NOT allowed to switch
* this task into the new images's memory mapping
* policy - that is, TASK_SIZE must still evaluate to
* that which is appropriate to the execing application.
* This is because exit_mmap() needs to have TASK_SIZE
* evaluate to the size of the old image.
*
* So if (say) a 64-bit application is execing a 32-bit
* application it is the architecture's responsibility
* to defer changing the value of TASK_SIZE until the
* switch really is going to happen - do this in
* flush_thread(). - akpm
*/
SET_PERSONALITY(loc->elf_ex, 0);
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.
*/
if (file_permission(interpreter, MAY_READ) < 0)
bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
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++;
}
elf_ppnt = elf_phdata;
for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
if (elf_ppnt->p_type == PT_GNU_STACK) {
if (elf_ppnt->p_flags & PF_X)
executable_stack = EXSTACK_ENABLE_X;
else
executable_stack = EXSTACK_DISABLE_X;
break;
}
/* Some simple consistency checks for the interpreter */
if (elf_interpreter) {
retval = -ELIBBAD;
/* Not an ELF interpreter */
if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
goto out_free_dentry;
/* Verify the interpreter has a valid arch */
if (!elf_check_arch(&loc->interp_elf_ex))
goto out_free_dentry;
} else {
/* Executables without an interpreter also need a personality */
SET_PERSONALITY(loc->elf_ex, 0);
}
/* 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->flags &= ~PF_FORKNOEXEC;
current->mm->def_flags = def_flags;
/* Do this immediately, since STACK_TOP as used in setup_arg_pages
may depend on the personality. */
SET_PERSONALITY(loc->elf_ex, 0);
if (elf_read_implies_exec(loc->elf_ex, executable_stack))
current->personality |= READ_IMPLIES_EXEC;
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
current->flags |= PF_RANDOMIZE;
arch_pick_mmap_layout(current->mm);
/* Do this so that we can load the interpreter, if need be. We will
change some of these later */
current->mm->free_area_cache = current->mm->mmap_base;
current->mm->cached_hole_size = 0;
retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
executable_stack);
if (retval < 0) {
send_sig(SIGKILL, current, 0);
goto out_free_dentry;
}
current->mm->start_stack = bprm->p;
/* Now we do a little grungy work by mmaping the ELF image into
the correct location in memory. */
for(i = 0, elf_ppnt = elf_phdata;
i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
int elf_prot = 0, elf_flags;
unsigned long k, vaddr;
if (elf_ppnt->p_type != PT_LOAD)
continue;
if (unlikely (elf_brk > elf_bss)) {
unsigned long nbyte;
/* There was a PT_LOAD segment with p_memsz > p_filesz
before this one. Map anonymous pages, if needed,
and clear the area. */
retval = set_brk (elf_bss + load_bias,
elf_brk + load_bias);
if (retval) {
send_sig(SIGKILL, current, 0);
goto out_free_dentry;
}
nbyte = ELF_PAGEOFFSET(elf_bss);
if (nbyte) {
nbyte = ELF_MIN_ALIGN - nbyte;
if (nbyte > elf_brk - elf_bss)
nbyte = elf_brk - elf_bss;
if (clear_user((void __user *)elf_bss +
load_bias, nbyte)) {
/*
* This bss-zeroing can fail if the ELF
* file specifies odd protections. So
* we don't check the return value
*/
}
}
}
if (elf_ppnt->p_flags & PF_R)
elf_prot |= PROT_READ;
if (elf_ppnt->p_flags & PF_W)
elf_prot |= PROT_WRITE;
if (elf_ppnt->p_flags & PF_X)
elf_prot |= PROT_EXEC;
elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
vaddr = elf_ppnt->p_vaddr;
if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
elf_flags |= MAP_FIXED;
} else if (loc->elf_ex.e_type == ET_DYN) {
/* Try and get dynamic programs out of the way of the
* default mmap base, as well as whatever program they
* might try to exec. This is because the brk will
* follow the loader, and is not movable. */
#ifdef CONFIG_X86
load_bias = 0;
#else
load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
#endif
}
error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
elf_prot, elf_flags, 0);
if (BAD_ADDR(error)) {
send_sig(SIGKILL, current, 0);
retval = IS_ERR((void *)error) ?
PTR_ERR((void*)error) : -EINVAL;
goto out_free_dentry;
}
if (!load_addr_set) {
load_addr_set = 1;
load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
if (loc->elf_ex.e_type == ET_DYN) {
load_bias += error -
ELF_PAGESTART(load_bias + vaddr);
load_addr += load_bias;
reloc_func_desc = load_bias;
}
}
k = elf_ppnt->p_vaddr;
if (k < start_code)
start_code = k;
if (start_data < k)
start_data = k;
/*
* Check to see if the section's size will overflow the
* allowed task size. Note that p_filesz must always be
* <= p_memsz so it is only necessary to check p_memsz.
*/
if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
elf_ppnt->p_memsz > TASK_SIZE ||
TASK_SIZE - elf_ppnt->p_memsz < k) {
/* set_brk can never work. Avoid overflows. */
send_sig(SIGKILL, current, 0);
retval = -EINVAL;
goto out_free_dentry;
}
k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
if (k > elf_bss)
elf_bss = k;
if ((elf_ppnt->p_flags & PF_X) && end_code < k)
end_code = k;
if (end_data < k)
end_data = k;
k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
if (k > elf_brk)
elf_brk = k;
}
loc->elf_ex.e_entry += load_bias;
elf_bss += load_bias;
elf_brk += load_bias;
start_code += load_bias;
end_code += load_bias;
start_data += load_bias;
end_data += load_bias;
/* Calling set_brk effectively mmaps the pages that we need
* for the bss and break sections. We must do this before
* mapping in the interpreter, to make sure it doesn't wind
* up getting placed where the bss needs to go.
*/
retval = set_brk(elf_bss, elf_brk);
if (retval) {
send_sig(SIGKILL, current, 0);
goto out_free_dentry;
}
if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
send_sig(SIGSEGV, current, 0);
retval = -EFAULT; /* Nobody gets to see this, but.. */
goto out_free_dentry;
}
if (elf_interpreter) {
unsigned long uninitialized_var(interp_map_addr);
elf_entry = load_elf_interp(&loc->interp_elf_ex,
interpreter,
&interp_map_addr,
load_bias);
if (!IS_ERR((void *)elf_entry)) {
/*
* load_elf_interp() returns relocation
* adjustment
*/
interp_load_addr = elf_entry;
elf_entry += loc->interp_elf_ex.e_entry;
}
if (BAD_ADDR(elf_entry)) {
force_sig(SIGSEGV, current);
retval = IS_ERR((void *)elf_entry) ?
(int)elf_entry : -EINVAL;
goto out_free_dentry;
}
reloc_func_desc = interp_load_addr;
allow_write_access(interpreter);
fput(interpreter);
kfree(elf_interpreter);
} else {
elf_entry = loc->elf_ex.e_entry;
if (BAD_ADDR(elf_entry)) {
force_sig(SIGSEGV, current);
retval = -EINVAL;
goto out_free_dentry;
}
}
kfree(elf_phdata);
sys_close(elf_exec_fileno);
set_binfmt(&elf_format);
#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
retval = arch_setup_additional_pages(bprm, executable_stack);
if (retval < 0) {
send_sig(SIGKILL, current, 0);
goto out;
}
#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
compute_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
retval = create_elf_tables(bprm, &loc->elf_ex,
load_addr, interp_load_addr);
if (retval < 0) {
send_sig(SIGKILL, current, 0);
goto out;
}
/* N.B. passed_fileno might not be initialized? */
current->mm->end_code = end_code;
current->mm->start_code = start_code;
current->mm->start_data = start_data;
current->mm->end_data = end_data;
current->mm->start_stack = bprm->p;
#ifdef arch_randomize_brk
if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1))
current->mm->brk = current->mm->start_brk =
arch_randomize_brk(current->mm);
#endif
if (current->personality & MMAP_PAGE_ZERO) {
/* 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);
error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE, 0);
up_write(¤t->mm->mmap_sem);
}
#ifdef ELF_PLAT_INIT
/*
* The ABI may specify that certain registers be set up in special
* ways (on i386 %edx is the address of a DT_FINI function, for
* example. In addition, it may also specify (eg, PowerPC64 ELF)
* that the e_entry field is the address of the function descriptor
* for the startup routine, rather than the address of the startup
* routine itself. This macro performs whatever initialization to
* the regs structure is required as well as any relocations to the
* function descriptor entries when executing dynamically links apps.
*/
ELF_PLAT_INIT(regs, reloc_func_desc);
#endif
start_thread(regs, elf_entry, bprm->p);
retval = 0;
out:
kfree(loc);
out_ret:
return retval;
/* error cleanup */
out_free_dentry:
allow_write_access(interpreter);
if (interpreter)
fput(interpreter);
out_free_interp:
kfree(elf_interpreter);
out_free_file:
sys_close(elf_exec_fileno);
out_free_ph:
kfree(elf_phdata);
goto out;
}
static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
{
struct exec ex;
unsigned long error;
unsigned long fd_offset;
unsigned long rlim;
int retval;
ex = *((struct exec *) bprm->buf); /* exec-header */
if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
N_TRSIZE(ex) || N_DRSIZE(ex) ||
bprm->file->f_dentry->d_inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
return -ENOEXEC;
}
fd_offset = N_TXTOFF(ex);
/* Check initial limits. This avoids letting people circumvent
* size limits imposed on them by creating programs with large
* arrays in the data or bss.
*/
rlim = current->rlim[RLIMIT_DATA].rlim_cur;
if (rlim >= RLIM_INFINITY)
rlim = ~0;
if (ex.a_data + ex.a_bss > rlim)
return -ENOMEM;
/* Flush all traces of the currently running executable */
retval = flush_old_exec(bprm);
if (retval)
return retval;
/* OK, This is the point of no return */
#if defined(__alpha__)
SET_AOUT_PERSONALITY(bprm, ex);
#elif defined(__sparc__)
set_personality(PER_SUNOS);
#if !defined(__sparc_v9__)
memcpy(¤t->thread.core_exec, &ex, sizeof(struct exec));
#endif
#else
set_personality(PER_LINUX);
#endif
current->mm->end_code = ex.a_text +
(current->mm->start_code = N_TXTADDR(ex));
current->mm->end_data = ex.a_data +
(current->mm->start_data = N_DATADDR(ex));
current->mm->brk = ex.a_bss +
(current->mm->start_brk = N_BSSADDR(ex));
current->mm->rss = 0;
current->mm->mmap = NULL;
#ifdef CONFIG_ARM_FASS
arch_new_mm(current, current->mm);
#endif
compute_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
#ifdef __sparc__
if (N_MAGIC(ex) == NMAGIC) {
loff_t pos = fd_offset;
/* F**k me plenty... */
/* <AOL></AOL> */
error = do_brk(N_TXTADDR(ex), ex.a_text);
bprm->file->f_op->read(bprm->file, (char *) N_TXTADDR(ex),
ex.a_text, &pos);
error = do_brk(N_DATADDR(ex), ex.a_data);
bprm->file->f_op->read(bprm->file, (char *) N_DATADDR(ex),
ex.a_data, &pos);
goto beyond_if;
}
#endif
if (N_MAGIC(ex) == OMAGIC) {
unsigned long text_addr, map_size;
loff_t pos;
text_addr = N_TXTADDR(ex);
#if defined(__alpha__) || defined(__sparc__)
pos = fd_offset;
map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1;
#else
pos = 32;
map_size = ex.a_text+ex.a_data;
#endif
error = do_brk(text_addr & PAGE_MASK, map_size);
if (error != (text_addr & PAGE_MASK)) {
send_sig(SIGKILL, current, 0);
return error;
}
error = bprm->file->f_op->read(bprm->file, (char *)text_addr,
ex.a_text+ex.a_data, &pos);
if ((signed long)error < 0) {
send_sig(SIGKILL, current, 0);
return error;
}
flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
} else {
static unsigned long error_time, error_time2;
if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
(N_MAGIC(ex) != NMAGIC) && (jiffies-error_time2) > 5*HZ)
{
printk(KERN_NOTICE "executable not page aligned\n");
error_time2 = jiffies;
}
if ((fd_offset & ~PAGE_MASK) != 0 &&
(jiffies-error_time) > 5*HZ)
{
printk(KERN_WARNING
"fd_offset is not page aligned. Please convert program: %s\n",
bprm->file->f_dentry->d_name.name);
error_time = jiffies;
}
if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
loff_t pos = fd_offset;
do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
bprm->file->f_op->read(bprm->file,(char *)N_TXTADDR(ex),
ex.a_text+ex.a_data, &pos);
flush_icache_range((unsigned long) N_TXTADDR(ex),
(unsigned long) N_TXTADDR(ex) +
ex.a_text+ex.a_data);
goto beyond_if;
}
down_write(¤t->mm->mmap_sem);
error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
PROT_READ | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
fd_offset);
up_write(¤t->mm->mmap_sem);
if (error != N_TXTADDR(ex)) {
send_sig(SIGKILL, current, 0);
return error;
}
down_write(¤t->mm->mmap_sem);
error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
fd_offset + ex.a_text);
up_write(¤t->mm->mmap_sem);
if (error != N_DATADDR(ex)) {
send_sig(SIGKILL, current, 0);
return error;
}
}
beyond_if:
set_binfmt(&aout_format);
set_brk(current->mm->start_brk, current->mm->brk);
retval = setup_arg_pages(bprm);
if (retval < 0) {
/* Someone check-me: is this error path enough? */
send_sig(SIGKILL, current, 0);
return retval;
}
current->mm->start_stack =
(unsigned long) create_aout_tables((char *) bprm->p, bprm);
#ifdef __alpha__
regs->gp = ex.a_gpvalue;
#endif
start_thread(regs, ex.a_entry, current->mm->start_stack);
if (current->ptrace & PT_PTRACED)
send_sig(SIGTRAP, current, 0);
#ifndef __arm__
return 0;
#else
return regs->ARM_r0;
#endif
}
static int
load_som_binary(struct linux_binprm * bprm, struct pt_regs * regs)
{
int som_exec_fileno;
int retval;
unsigned int size;
unsigned long som_entry;
struct som_hdr *som_ex;
struct som_exec_auxhdr *hpuxhdr;
/* Get the exec-header */
som_ex = (struct som_hdr *) bprm->buf;
retval = check_som_header(som_ex);
if (retval != 0)
goto out;
/* Now read in the auxiliary header information */
retval = -ENOMEM;
size = som_ex->aux_header_size;
if (size > SOM_PAGESIZE)
goto out;
hpuxhdr = (struct som_exec_auxhdr *) kmalloc(size, GFP_KERNEL);
if (!hpuxhdr)
goto out;
retval = kernel_read(bprm->file, som_ex->aux_header_location,
(char *) hpuxhdr, size);
if (retval < 0)
goto out_free;
#error "Fix security hole before enabling me"
retval = get_unused_fd();
if (retval < 0)
goto out_free;
get_file(bprm->file);
fd_install(som_exec_fileno = retval, bprm->file);
/* Flush all traces of the currently running executable */
retval = flush_old_exec(bprm);
if (retval)
goto out_free;
/* OK, This is the point of no return */
current->flags &= ~PF_FORKNOEXEC;
current->personality = PER_HPUX;
/* Set the task size for HP-UX processes such that
* the gateway page is outside the address space.
* This can be fixed later, but for now, this is much
* easier.
*/
current->thread.task_size = 0xc0000000;
/* Set map base to allow enough room for hp-ux heap growth */
current->thread.map_base = 0x80000000;
retval = map_som_binary(bprm->file, hpuxhdr);
if (retval < 0)
goto out_free;
som_entry = hpuxhdr->exec_entry;
kfree(hpuxhdr);
set_binfmt(&som_format);
compute_creds(bprm);
setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
create_som_tables(bprm);
current->mm->start_stack = bprm->p;
current->mm->rss = 0;
#if 0
printk("(start_brk) %08lx\n" , (unsigned long) current->mm->start_brk);
printk("(end_code) %08lx\n" , (unsigned long) current->mm->end_code);
printk("(start_code) %08lx\n" , (unsigned long) current->mm->start_code);
printk("(end_data) %08lx\n" , (unsigned long) current->mm->end_data);
printk("(start_stack) %08lx\n" , (unsigned long) current->mm->start_stack);
printk("(brk) %08lx\n" , (unsigned long) current->mm->brk);
#endif
map_hpux_gateway_page(current,current->mm);
start_thread_som(regs, som_entry, bprm->p);
if (current->ptrace & PT_PTRACED)
send_sig(SIGTRAP, current, 0);
return 0;
/* error cleanup */
out_free:
kfree(hpuxhdr);
out:
return retval;
}
/*
* Helper function to process the load operation.
*/
static int
coff_load_object(struct linux_binprm *bprm, struct pt_regs *regs, int binary)
{
COFF_FILHDR *coff_hdr = NULL;
COFF_SCNHDR *text_sect = NULL, *data_sect = NULL,
*bss_sect = NULL, *sect_bufr = NULL,
*sect_ptr = NULL;
int text_count = 0, data_count = 0,
bss_count = 0, lib_count = 0;
coff_section text, data, bss;
u_long start_addr = 0, p = bprm->p;
short flags, aout_size = 0;
int pageable = 1, sections = 0, status = 0, i;
int coff_exec_fileno;
mm_segment_t old_fs;
coff_hdr = (COFF_FILHDR *)bprm->buf;
/*
* Validate the magic value for the object file.
*/
if (COFF_I386BADMAG(*coff_hdr))
return -ENOEXEC;
flags = COFF_SHORT(coff_hdr->f_flags);
/*
* The object file should have 32 BIT little endian format. Do not allow
* it to have the 16 bit object file flag set as Linux is not able to run
* on the 80286/80186/8086.
*/
if ((flags & (COFF_F_AR32WR | COFF_F_AR16WR)) != COFF_F_AR32WR)
return -ENOEXEC;
/*
* If the file is not executable then reject the execution. This means
* that there must not be external references.
*/
if ((flags & COFF_F_EXEC) == 0)
return -ENOEXEC;
/*
* Extract the header information which we need.
*/
sections = COFF_SHORT(coff_hdr->f_nscns); /* Number of sections */
aout_size = COFF_SHORT(coff_hdr->f_opthdr); /* Size of opt. headr */
/*
* There must be at least one section.
*/
if (!sections)
return -ENOEXEC;
if (!bprm->file->f_op->mmap)
pageable = 0;
if (!(sect_bufr = kmalloc(sections * COFF_SCNHSZ, GFP_KERNEL))) {
printk(KERN_WARNING "coff: kmalloc failed\n");
return -ENOMEM;
}
status = kernel_read(bprm->file, aout_size + COFF_FILHSZ,
(char *)sect_bufr, sections * COFF_SCNHSZ);
if (status < 0) {
printk(KERN_WARNING "coff: unable to read\n");
goto out_free_buf;
}
status = get_unused_fd();
if (status < 0) {
printk(KERN_WARNING "coff: unable to get free fs\n");
goto out_free_buf;
}
get_file(bprm->file);
fd_install(coff_exec_fileno = status, bprm->file);
/*
* Loop through the sections and find the various types
*/
sect_ptr = sect_bufr;
for (i = 0; i < sections; i++) {
long int sect_flags = COFF_LONG(sect_ptr->s_flags);
switch (sect_flags) {
case COFF_STYP_TEXT:
status |= coff_isaligned(sect_ptr);
text_sect = sect_ptr;
text_count++;
break;
case COFF_STYP_DATA:
status |= coff_isaligned(sect_ptr);
data_sect = sect_ptr;
data_count++;
break;
case COFF_STYP_BSS:
bss_sect = sect_ptr;
bss_count++;
break;
case COFF_STYP_LIB:
lib_count++;
break;
default:
break;
}
sect_ptr = (COFF_SCNHDR *) & ((char *) sect_ptr)[COFF_SCNHSZ];
}
/*
* If any of the sections weren't properly aligned we aren't
* going to be able to demand page this executable. Note that
* at this stage the *only* excuse for having status <= 0 is if
* the alignment test failed.
*/
if (status < 0)
pageable = 0;
/*
* Ensure that there are the required sections. There must be one
* text sections and one each of the data and bss sections for an
* executable. A library may or may not have a data / bss section.
*/
if (text_count != 1) {
status = -ENOEXEC;
goto out_free_file;
}
if (binary && (data_count != 1 || bss_count != 1)) {
status = -ENOEXEC;
goto out_free_file;
}
/*
* If there is no additional header then assume the file starts
* at the first byte of the text section. This may not be the
* proper place, so the best solution is to include the optional
* header. A shared library __MUST__ have an optional header to
* indicate that it is a shared library.
*/
if (aout_size == 0) {
if (!binary) {
status = -ENOEXEC;
goto out_free_file;
}
start_addr = COFF_LONG(text_sect->s_vaddr);
} else if (aout_size < (short) COFF_AOUTSZ) {
status = -ENOEXEC;
goto out_free_file;
} else {
COFF_AOUTHDR *aout_hdr;
short aout_magic;
aout_hdr = (COFF_AOUTHDR *) &((char *)coff_hdr)[COFF_FILHSZ];
aout_magic = COFF_SHORT(aout_hdr->magic);
/*
* Validate the magic number in the a.out header. If it is valid then
* update the starting symbol location. Do not accept these file formats
* when loading a shared library.
*/
switch (aout_magic) {
case COFF_OMAGIC:
case COFF_ZMAGIC:
case COFF_STMAGIC:
if (!binary) {
status = -ENOEXEC;
goto out_free_file;
}
start_addr = (u_int)COFF_LONG(aout_hdr->entry);
break;
/*
* Magic value for a shared library. This is valid only when
* loading a shared library.
*
* (There is no need for a start_addr. It won't be used.)
*/
case COFF_SHMAGIC:
if (!binary)
break;
/* FALLTHROUGH */
default:
status = -ENOEXEC;
goto out_free_file;
}
}
/*
* Generate the proper values for the text fields
*
* THIS IS THE POINT OF NO RETURN. THE NEW PROCESS WILL TRAP OUT SHOULD
* SOMETHING FAIL IN THE LOAD SEQUENCE FROM THIS POINT ONWARD.
*/
text.scnptr = COFF_LONG(text_sect->s_scnptr);
text.size = COFF_LONG(text_sect->s_size);
text.vaddr = COFF_LONG(text_sect->s_vaddr);
/*
* Generate the proper values for the data fields
*/
if (data_sect != NULL) {
data.scnptr = COFF_LONG(data_sect->s_scnptr);
data.size = COFF_LONG(data_sect->s_size);
data.vaddr = COFF_LONG(data_sect->s_vaddr);
} else {
data.scnptr = 0;
data.size = 0;
data.vaddr = 0;
}
/*
* Generate the proper values for the bss fields
*/
if (bss_sect != NULL) {
bss.size = COFF_LONG(bss_sect->s_size);
bss.vaddr = COFF_LONG(bss_sect->s_vaddr);
} else {
bss.size = 0;
bss.vaddr = 0;
}
/*
* Flush the executable from memory. At this point the executable is
* committed to being defined or a segmentation violation will occur.
*/
if (binary) {
COFF_SCNHDR *sect_ptr2 = sect_bufr;
u_long personality = PER_SVR3;
int i;
if ((status = flush_old_exec(bprm)))
goto out_free_file;
/*
* Look for clues as to the system this binary was compiled
* on in the comments section(s).
*
* Only look at the main binary, not the shared libraries
* (or would it be better to prefer shared libraries over
* binaries? Or could they be different???)
*/
for (i = 0; i < sections; i++) {
long sect_flags = COFF_LONG(sect_ptr2->s_flags);
if (sect_flags == COFF_STYP_INFO &&
(status = coff_parse_comments(bprm->file,
sect_ptr2, &personality)) > 0)
goto found;
sect_ptr2 = (COFF_SCNHDR *) &((char *)sect_ptr2)[COFF_SCNHSZ];
}
/*
* If no .comments section was found there is no way to
* figure out the personality. Odds on it is SCO though...
*/
personality = abi_defhandler_coff;
found:
set_personality(personality);
current->mm->start_data = 0;
current->mm->end_data = 0;
current->mm->end_code = 0;
current->mm->mmap = NULL;
current->flags &= ~PF_FORKNOEXEC;
current->mm->_rss = 0;
/*
* Construct the parameter and environment
* string table entries.
*/
if ((status = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT)) < 0)
goto sigsegv;
p = (u_long)coff_mktables((char *)bprm->p,
bprm->argc, bprm->envc);
current->mm->end_code = text.size +
(current->mm->start_code = text.vaddr);
current->mm->end_data = data.size +
(current->mm->start_data = data.vaddr);
current->mm->brk = bss.size +
(current->mm->start_brk = bss.vaddr);
current->mm->start_stack = p;
compute_creds(bprm);
start_thread(regs, start_addr, p);
}
old_fs = get_fs();
set_fs(get_ds());
if (!pageable) {
/*
* Read the file from disk...
*
* XXX: untested.
*/
loff_t pos = data.scnptr;
status = do_brk(text.vaddr, text.size);
bprm->file->f_op->read(bprm->file,
(char *)data.vaddr, data.scnptr, &pos);
status = do_brk(data.vaddr, data.size);
bprm->file->f_op->read(bprm->file,
(char *)text.vaddr, text.scnptr, &pos);
status = 0;
} else {
/* map the text pages...*/
status = map_coff(bprm->file, &text, PROT_READ | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
text.scnptr & PAGE_MASK);
if (status != (text.vaddr & PAGE_MASK)) {
status = -ENOEXEC;
goto out_free_file;
}
/* map the data pages */
if (data.size != 0) {
status = map_coff(bprm->file, &data,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
data.scnptr & PAGE_MASK);
if (status != (data.vaddr & PAGE_MASK)) {
status = -ENOEXEC;
goto out_free_file;
}
}
status = 0;
}
/*
* Construct the bss data for the process. The bss ranges from the
* end of the data (which may not be on a page boundary) to the end
* of the bss section. Allocate any necessary pages for the data.
*/
if (bss.size != 0) {
down_write(¤t->mm->mmap_sem);
do_mmap(NULL, PAGE_ALIGN(bss.vaddr),
bss.size + bss.vaddr -
PAGE_ALIGN(bss.vaddr),
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE, 0);
up_write(¤t->mm->mmap_sem);
if ((status = coff_clear_memory(bss.vaddr, bss.size)) < 0)
goto out_free_file;
}
set_fs(old_fs);
if (!binary)
goto out_free_file;
/*
* Load any shared library for the executable.
*/
if (lib_count)
status = coff_preload_shlibs(bprm, sect_bufr, sections);
set_binfmt(&coff_format);
/*
* Generate any needed trap for this process. If an error occured then
* generate a segmentation violation. If the process is being debugged
* then generate the load trap. (Note: If this is a library load then
* do not generate the trap here. Pass the error to the caller who
* will do it for the process in the outer lay of this procedure call.)
*/
if (status < 0) {
sigsegv:
printk(KERN_WARNING "coff: trapping process with SEGV\n");
send_sig(SIGSEGV, current, 0); /* Generate the error trap */
} else if (current->ptrace & PT_PTRACED)
send_sig(SIGTRAP, current, 0);
/* We are committed. It can't fail */
status = 0;
out_free_file:
sys_close(coff_exec_fileno);
out_free_buf:
kfree(sect_bufr);
return (status);
}
static inline int
do_load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
{
struct file * file;
struct dentry *interpreter_dentry = NULL; /* to shut gcc up */
unsigned long load_addr = 0, load_bias;
int load_addr_set = 0;
char * elf_interpreter = NULL;
unsigned int interpreter_type = INTERPRETER_NONE;
unsigned char ibcs2_interpreter = 0;
mm_segment_t old_fs;
unsigned long error;
struct elf_phdr * elf_ppnt, *elf_phdata;
unsigned long elf_bss, k, elf_brk;
int elf_exec_fileno;
int retval, size, i;
unsigned long elf_entry, interp_load_addr = 0;
unsigned long start_code, end_code, end_data;
struct elfhdr elf_ex;
struct elfhdr interp_elf_ex;
struct exec interp_ex;
char passed_fileno[6];
/* Get the exec-header */
elf_ex = *((struct elfhdr *) bprm->buf);
retval = -ENOEXEC;
/* First of all, some simple consistency checks */
if (elf_ex.e_ident[0] != 0x7f ||
strncmp(&elf_ex.e_ident[1], "ELF", 3) != 0)
goto out;
if (elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN)
goto out;
if (!elf_check_arch(elf_ex.e_machine))
goto out;
#ifdef __mips__
/* allow only mips1 if exec is MIPSEB elf,
because IRIX binaries handled elsewhere. */
/* borrowed from binutils/include/elf/common.h*/
#define EI_DATA 5 /* Data encoding */
#define ELFDATA2MSB 2 /* 2's complement, big endian */
if ((elf_ex.e_ident[EI_DATA] == ELFDATA2MSB ) &&
(elf_ex.e_flags & EF_MIPS_ARCH) ) {
retval = -ENOEXEC;
goto out;
}
#endif
if (!bprm->dentry->d_inode->i_op ||
!bprm->dentry->d_inode->i_op->default_file_ops ||
!bprm->dentry->d_inode->i_op->default_file_ops->mmap)
goto out;
/* Now read in all of the header information */
retval = -ENOMEM;
size = elf_ex.e_phentsize * elf_ex.e_phnum;
elf_phdata = (struct elf_phdr *) kmalloc(size, GFP_KERNEL);
if (!elf_phdata)
goto out;
retval = read_exec(bprm->dentry, elf_ex.e_phoff,
(char *) elf_phdata, size, 1);
if (retval < 0)
goto out_free_ph;
retval = open_dentry(bprm->dentry, O_RDONLY);
if (retval < 0)
goto out_free_ph;
elf_exec_fileno = retval;
file = fget(elf_exec_fileno);
elf_ppnt = elf_phdata;
elf_bss = 0;
elf_brk = 0;
start_code = ~0UL;
end_code = 0;
end_data = 0;
for (i = 0; i < elf_ex.e_phnum; i++) {
if (elf_ppnt->p_type == PT_INTERP) {
retval = -EINVAL;
if (elf_interpreter)
goto out_free_interp;
/* This is the program interpreter used for
* shared libraries - for now assume that this
* is an a.out format binary
*/
retval = -ENOMEM;
elf_interpreter = (char *) kmalloc(elf_ppnt->p_filesz,
GFP_KERNEL);
if (!elf_interpreter)
goto out_free_file;
retval = read_exec(bprm->dentry, elf_ppnt->p_offset,
elf_interpreter,
elf_ppnt->p_filesz, 1);
if (retval < 0)
goto out_free_interp;
/* If the program interpreter is one of these two,
* then assume an iBCS2 image. Otherwise assume
* a native linux image.
*/
if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0)
ibcs2_interpreter = 1;
#if 0
printk("Using ELF interpreter %s\n", elf_interpreter);
#endif
old_fs = get_fs(); /* This could probably be optimized */
set_fs(get_ds());
#ifdef __sparc__
if (ibcs2_interpreter) {
unsigned long old_pers = current->personality;
current->personality = PER_SVR4;
interpreter_dentry = open_namei(elf_interpreter,
0, 0);
current->personality = old_pers;
} else
#endif
interpreter_dentry = open_namei(elf_interpreter,
0, 0);
set_fs(old_fs);
retval = PTR_ERR(interpreter_dentry);
if (IS_ERR(interpreter_dentry))
goto out_free_interp;
retval = permission(interpreter_dentry->d_inode, MAY_EXEC);
if (retval < 0)
goto out_free_dentry;
retval = read_exec(interpreter_dentry, 0, bprm->buf, 128, 1);
if (retval < 0)
goto out_free_dentry;
/* Get the exec headers */
interp_ex = *((struct exec *) bprm->buf);
interp_elf_ex = *((struct elfhdr *) bprm->buf);
}
elf_ppnt++;
}
/* Some simple consistency checks for the interpreter */
if (elf_interpreter) {
interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
/* Now figure out which format our binary is */
if ((N_MAGIC(interp_ex) != OMAGIC) &&
(N_MAGIC(interp_ex) != ZMAGIC) &&
(N_MAGIC(interp_ex) != QMAGIC))
interpreter_type = INTERPRETER_ELF;
if (interp_elf_ex.e_ident[0] != 0x7f ||
strncmp(&interp_elf_ex.e_ident[1], "ELF", 3) != 0)
interpreter_type &= ~INTERPRETER_ELF;
retval = -ELIBBAD;
if (!interpreter_type)
goto out_free_dentry;
/* Make sure only one type was selected */
if ((interpreter_type & INTERPRETER_ELF) &&
interpreter_type != INTERPRETER_ELF) {
printk(KERN_WARNING "ELF: Ambiguous type, using ELF\n");
interpreter_type = INTERPRETER_ELF;
}
}
/* OK, we are done with that, now set up the arg stuff,
and then start this sucker up */
if (!bprm->sh_bang) {
char * passed_p;
if (interpreter_type == INTERPRETER_AOUT) {
sprintf(passed_fileno, "%d", elf_exec_fileno);
passed_p = passed_fileno;
if (elf_interpreter) {
bprm->p = copy_strings(1,&passed_p,bprm->page,bprm->p,2);
bprm->argc++;
}
}
retval = -E2BIG;
if (!bprm->p)
goto out_free_dentry;
}
/* 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 long) elf_ex.e_entry;
/* Do this immediately, since STACK_TOP as used in setup_arg_pages
may depend on the personality. */
SET_PERSONALITY(elf_ex, ibcs2_interpreter);
/* Do this so that we can load the interpreter, if need be. We will
change some of these later */
current->mm->rss = 0;
bprm->p = setup_arg_pages(bprm->p, bprm);
current->mm->start_stack = bprm->p;
/* Try and get dynamic programs out of the way of the default mmap
base, as well as whatever program they might try to exec. This
is because the brk will follow the loader, and is not movable. */
load_bias = ELF_PAGESTART(elf_ex.e_type==ET_DYN ? ELF_ET_DYN_BASE : 0);
/* Now we do a little grungy work by mmaping the ELF image into
the correct location in memory. 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());
for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) {
int elf_prot = 0, elf_flags;
unsigned long vaddr;
if (elf_ppnt->p_type != PT_LOAD)
continue;
if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
elf_flags = MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
vaddr = elf_ppnt->p_vaddr;
if (elf_ex.e_type == ET_EXEC || load_addr_set) {
elf_flags |= MAP_FIXED;
}
error = do_mmap(file, ELF_PAGESTART(load_bias + vaddr),
(elf_ppnt->p_filesz +
ELF_PAGEOFFSET(elf_ppnt->p_vaddr)),
elf_prot, elf_flags, (elf_ppnt->p_offset -
ELF_PAGEOFFSET(elf_ppnt->p_vaddr)));
if (!load_addr_set) {
load_addr_set = 1;
load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
if (elf_ex.e_type == ET_DYN) {
load_bias += error -
ELF_PAGESTART(load_bias + vaddr);
load_addr += error;
}
}
k = elf_ppnt->p_vaddr;
if (k < start_code) start_code = k;
k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
if (k > elf_bss)
elf_bss = k;
if ((elf_ppnt->p_flags & PF_X) && end_code < k)
end_code = k;
if (end_data < k)
end_data = k;
k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
if (k > elf_brk)
elf_brk = k;
}
set_fs(old_fs);
fput(file); /* all done with the file */
elf_entry += load_bias;
elf_bss += load_bias;
elf_brk += load_bias;
start_code += load_bias;
end_code += load_bias;
end_data += load_bias;
if (elf_interpreter) {
if (interpreter_type == INTERPRETER_AOUT)
elf_entry = load_aout_interp(&interp_ex,
interpreter_dentry);
else
elf_entry = load_elf_interp(&interp_elf_ex,
interpreter_dentry,
&interp_load_addr);
dput(interpreter_dentry);
kfree(elf_interpreter);
if (elf_entry == ~0UL) {
printk(KERN_ERR "Unable to load interpreter\n");
kfree(elf_phdata);
send_sig(SIGSEGV, current, 0);
return 0;
}
}
kfree(elf_phdata);
if (interpreter_type != INTERPRETER_AOUT)
sys_close(elf_exec_fileno);
if (current->exec_domain && current->exec_domain->module)
__MOD_DEC_USE_COUNT(current->exec_domain->module);
if (current->binfmt && current->binfmt->module)
__MOD_DEC_USE_COUNT(current->binfmt->module);
current->exec_domain = lookup_exec_domain(current->personality);
current->binfmt = &elf_format;
if (current->exec_domain && current->exec_domain->module)
__MOD_INC_USE_COUNT(current->exec_domain->module);
if (current->binfmt && current->binfmt->module)
__MOD_INC_USE_COUNT(current->binfmt->module);
#ifndef VM_STACK_FLAGS
current->executable = dget(bprm->dentry);
#endif
compute_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
bprm->p = (unsigned long)
create_elf_tables((char *)bprm->p,
bprm->argc,
bprm->envc,
(interpreter_type == INTERPRETER_ELF ? &elf_ex : NULL),
load_addr, load_bias,
interp_load_addr,
(interpreter_type == INTERPRETER_AOUT ? 0 : 1));
/* N.B. passed_fileno might not be initialized? */
if (interpreter_type == INTERPRETER_AOUT)
current->mm->arg_start += strlen(passed_fileno) + 1;
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);
padzero(elf_bss);
#if 0
printk("(start_brk) %x\n" , current->mm->start_brk);
printk("(end_code) %x\n" , current->mm->end_code);
printk("(start_code) %x\n" , current->mm->start_code);
printk("(end_data) %x\n" , current->mm->end_data);
printk("(start_stack) %x\n" , current->mm->start_stack);
printk("(brk) %x\n" , current->mm->brk);
#endif
if ( current->personality == PER_SVR4 )
{
/* 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. */
/* N.B. Shouldn't the size here be PAGE_SIZE?? */
error = do_mmap(NULL, 0, 4096, PROT_READ | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE, 0);
}
#ifdef ELF_PLAT_INIT
/*
* The ABI may specify that certain registers be set up in special
* ways (on i386 %edx is the address of a DT_FINI function, for
* example. This macro performs whatever initialization to
* the regs structure is required.
*/
ELF_PLAT_INIT(regs);
#endif
start_thread(regs, elf_entry, bprm->p);
if (current->flags & PF_PTRACED)
send_sig(SIGTRAP, current, 0);
retval = 0;
out:
return retval;
/* error cleanup */
out_free_dentry:
dput(interpreter_dentry);
out_free_interp:
if (elf_interpreter)
kfree(elf_interpreter);
out_free_file:
fput(file);
sys_close(elf_exec_fileno);
out_free_ph:
kfree(elf_phdata);
goto out;
}
/*
* load an fdpic binary into various bits of memory
*/
static int load_elf_fdpic_binary(struct linux_binprm *bprm, struct pt_regs *regs)
{
struct elf_fdpic_params exec_params, interp_params;
struct elf_phdr *phdr;
unsigned long stack_size;
struct file *interpreter = NULL; /* to shut gcc up */
char *interpreter_name = NULL;
int executable_stack;
int retval, i;
memset(&exec_params, 0, sizeof(exec_params));
memset(&interp_params, 0, sizeof(interp_params));
exec_params.hdr = *(struct elfhdr *) bprm->buf;
exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE;
/* check that this is a binary we know how to deal with */
retval = -ENOEXEC;
if (!is_elf_fdpic(&exec_params.hdr, bprm->file))
goto error;
/* read the program header table */
retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file);
if (retval < 0)
goto error;
/* scan for a program header that specifies an interpreter */
phdr = exec_params.phdrs;
for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) {
switch (phdr->p_type) {
case PT_INTERP:
retval = -ENOMEM;
if (phdr->p_filesz > PATH_MAX)
goto error;
retval = -ENOENT;
if (phdr->p_filesz < 2)
goto error;
/* read the name of the interpreter into memory */
interpreter_name = (char *) kmalloc(phdr->p_filesz, GFP_KERNEL);
if (!interpreter_name)
goto error;
retval = kernel_read(bprm->file,
phdr->p_offset,
interpreter_name,
phdr->p_filesz);
if (retval < 0)
goto error;
retval = -ENOENT;
if (interpreter_name[phdr->p_filesz - 1] != '\0')
goto error;
kdebug("Using ELF interpreter %s", interpreter_name);
/* replace the program with the interpreter */
interpreter = open_exec(interpreter_name);
retval = PTR_ERR(interpreter);
if (IS_ERR(interpreter)) {
interpreter = NULL;
goto error;
}
retval = kernel_read(interpreter, 0, bprm->buf, BINPRM_BUF_SIZE);
if (retval < 0)
goto error;
interp_params.hdr = *((struct elfhdr *) bprm->buf);
break;
case PT_LOAD:
#ifdef CONFIG_MMU
if (exec_params.load_addr == 0)
exec_params.load_addr = phdr->p_vaddr;
#endif
break;
}
}
if (elf_check_const_displacement(&exec_params.hdr))
exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
/* perform insanity checks on the interpreter */
if (interpreter_name) {
retval = -ELIBBAD;
if (!is_elf_fdpic(&interp_params.hdr, interpreter))
goto error;
interp_params.flags = ELF_FDPIC_FLAG_PRESENT;
/* read the interpreter's program header table */
retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter);
if (retval < 0)
goto error;
}
stack_size = exec_params.stack_size;
if (stack_size < interp_params.stack_size)
stack_size = interp_params.stack_size;
if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
executable_stack = EXSTACK_ENABLE_X;
else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
executable_stack = EXSTACK_DISABLE_X;
else if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
executable_stack = EXSTACK_ENABLE_X;
else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
executable_stack = EXSTACK_DISABLE_X;
else
executable_stack = EXSTACK_DEFAULT;
retval = -ENOEXEC;
if (stack_size == 0)
goto error;
if (elf_check_const_displacement(&interp_params.hdr))
interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
/* flush all traces of the currently running executable */
retval = flush_old_exec(bprm);
if (retval)
goto error;
/* there's now no turning back... the old userspace image is dead,
* defunct, deceased, etc. after this point we have to exit via
* error_kill */
set_personality(PER_LINUX_FDPIC);
set_binfmt(&elf_fdpic_format);
current->mm->start_code = 0;
current->mm->end_code = 0;
current->mm->start_stack = 0;
current->mm->start_data = 0;
current->mm->end_data = 0;
current->mm->context.exec_fdpic_loadmap = 0;
current->mm->context.interp_fdpic_loadmap = 0;
current->flags &= ~PF_FORKNOEXEC;
#ifdef CONFIG_MMU
elf_fdpic_arch_lay_out_mm(&exec_params,
&interp_params,
¤t->mm->start_stack,
¤t->mm->start_brk);
#endif
/* do this so that we can load the interpreter, if need be
* - we will change some of these later
*/
set_mm_counter(current->mm, rss, 0);
#ifdef CONFIG_MMU
retval = setup_arg_pages(bprm, current->mm->start_stack, executable_stack);
if (retval < 0) {
send_sig(SIGKILL, current, 0);
goto error_kill;
}
#endif
/* load the executable and interpreter into memory */
retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, "executable");
if (retval < 0)
goto error_kill;
if (interpreter_name) {
retval = elf_fdpic_map_file(&interp_params, interpreter,
current->mm, "interpreter");
if (retval < 0) {
printk(KERN_ERR "Unable to load interpreter\n");
goto error_kill;
}
allow_write_access(interpreter);
fput(interpreter);
interpreter = NULL;
}
#ifdef CONFIG_MMU
if (!current->mm->start_brk)
current->mm->start_brk = current->mm->end_data;
current->mm->brk = current->mm->start_brk = PAGE_ALIGN(current->mm->start_brk);
#else
/* create a stack and brk area big enough for everyone
* - the brk heap starts at the bottom and works up
* - the stack starts at the top and works down
*/
stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
if (stack_size < PAGE_SIZE * 2)
stack_size = PAGE_SIZE * 2;
down_write(¤t->mm->mmap_sem);
current->mm->start_brk = do_mmap(NULL,
0,
stack_size,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANON | MAP_GROWSDOWN,
0);
if (IS_ERR((void *) current->mm->start_brk)) {
up_write(¤t->mm->mmap_sem);
retval = current->mm->start_brk;
current->mm->start_brk = 0;
goto error_kill;
}
if (do_mremap(current->mm->start_brk,
stack_size,
ksize((char *) current->mm->start_brk),
0, 0
) == current->mm->start_brk
)
stack_size = ksize((char *) current->mm->start_brk);
up_write(¤t->mm->mmap_sem);
current->mm->brk = current->mm->start_brk;
current->mm->context.end_brk = current->mm->start_brk;
current->mm->context.end_brk += (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0;
current->mm->start_stack = current->mm->start_brk + stack_size;
#endif
compute_creds(bprm);
current->flags &= ~PF_FORKNOEXEC;
if (create_elf_fdpic_tables(bprm, current->mm, &exec_params, &interp_params) < 0)
goto error_kill;
kdebug("- start_code %lx", (long) current->mm->start_code);
kdebug("- end_code %lx", (long) current->mm->end_code);
kdebug("- start_data %lx", (long) current->mm->start_data);
kdebug("- end_data %lx", (long) current->mm->end_data);
kdebug("- start_brk %lx", (long) current->mm->start_brk);
kdebug("- brk %lx", (long) current->mm->brk);
kdebug("- start_stack %lx", (long) current->mm->start_stack);
#ifdef ELF_FDPIC_PLAT_INIT
/*
* The ABI may specify that certain registers be set up in special
* ways (on i386 %edx is the address of a DT_FINI function, for
* example. This macro performs whatever initialization to
* the regs structure is required.
*/
ELF_FDPIC_PLAT_INIT(regs,
exec_params.map_addr,
interp_params.map_addr,
interp_params.dynamic_addr ?: exec_params.dynamic_addr
);
#endif
/* everything is now ready... get the userspace context ready to roll */
start_thread(regs,
interp_params.entry_addr ?: exec_params.entry_addr,
current->mm->start_stack);
if (unlikely(current->ptrace & PT_PTRACED)) {
if (current->ptrace & PT_TRACE_EXEC)
ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
else
send_sig(SIGTRAP, current, 0);
}
retval = 0;
error:
if (interpreter) {
allow_write_access(interpreter);
fput(interpreter);
}
if (interpreter_name)
kfree(interpreter_name);
if (exec_params.phdrs)
kfree(exec_params.phdrs);
if (exec_params.loadmap)
kfree(exec_params.loadmap);
if (interp_params.phdrs)
kfree(interp_params.phdrs);
if (interp_params.loadmap)
kfree(interp_params.loadmap);
return retval;
/* unrecoverable error - kill the process */
error_kill:
send_sig(SIGSEGV, current, 0);
goto error;
} /* end load_elf_fdpic_binary() */
/* 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;
}
