static inline int
is_properly_aligned (COFF_SCNHDR *sect)
{
long scnptr = COFF_LONG (sect->s_scnptr);
long vaddr = COFF_LONG (sect->s_vaddr);
/*
* Print the section information if needed
*/
#ifdef COFF_DEBUG
printk ("%s, scnptr = %d, vaddr = %d\n",
sect->s_name,
scnptr, vaddr);
#endif
/*
* Return the error code if the section is not properly aligned.
*/
#ifdef COFF_DEBUG
if (((vaddr - scnptr) & ~PAGE_MASK) != 0)
printk ("bad alignment in %s\n", sect->s_name);
#endif
return ((((vaddr - scnptr) & ~PAGE_MASK) != 0) ? -ENOEXEC : 0);
}
/*
* Small procedure to test for the proper file alignment.
* Return the error code if the section is not properly aligned.
*/
static __inline__ int
coff_isaligned(COFF_SCNHDR *sectp)
{
long scnptr = COFF_LONG(sectp->s_scnptr);
long vaddr = COFF_LONG(sectp->s_vaddr);
if ((vaddr - scnptr) & ~PAGE_MASK)
return -ENOEXEC;
return 0;
}
/*
* Find all library sections and preload the shared libraries.
*
* This will eventually recurse to our code and load the shared
* library with our own procedures.
*/
static int
coff_preload_shlibs(struct linux_binprm *bpp, COFF_SCNHDR *sp, int sections)
{
long flags;
int err = 0, i;
for (i = 0; i < sections; i++) {
flags = COFF_LONG(sp->s_flags);
if (flags == COFF_STYP_LIB) {
if ((err = coff_preload_shlib(bpp, sp)))
break;
}
sp = (COFF_SCNHDR *)&((char *)sp)[COFF_SCNHSZ];
}
return (err);
}
/*
* This procedure is called to load a library section. The various
* libraries are loaded from the list given in the section data.
*/
static int
coff_preload_shlib(struct linux_binprm *exe_bprm, COFF_SCNHDR *sect)
{
COFF_SLIBHD *phdr;
char *buffer;
long nbytes;
int err = 0;
/*
* Fetch the size of the section. There must be
* enough room for at least one entry.
*/
nbytes = (long)COFF_LONG(sect->s_size);
if (nbytes < (long)COFF_SLIBSZ)
return -ENOEXEC;
if (!(buffer = kmalloc(nbytes, GFP_KERNEL))) {
printk(KERN_WARNING "coff: unable to allocate shlib buffer\n");
return -ENOMEM;
}
err = kernel_read(exe_bprm->file,
COFF_LONG(sect->s_scnptr), buffer, nbytes);
if (err < 0)
goto out;
if (err != nbytes)
goto enoexec;
/*
* Go through the list of libraries in the data area.
*/
phdr = (COFF_SLIBHD *)buffer;
while (nbytes > (long)COFF_SLIBSZ) {
int entry_size, header_size;
mm_segment_t old_fs = get_fs();
entry_size = COFF_LONG(phdr->sl_entsz) * sizeof(long);
header_size = COFF_LONG(phdr->sl_pathndx) * sizeof(long);
/*
* Validate the sizes of the various items.
* I don't trust the linker!!
*/
if ((u_int)header_size >= (u_int)nbytes)
goto enoexec;
if ((u_int)entry_size <= (u_int)header_size)
goto enoexec;
if (entry_size <= 0)
goto enoexec;
set_fs(get_ds());
err = sys_uselib(&((char *)phdr)[header_size]);
set_fs(old_fs);
if (err < 0)
goto out;
/*
* Point to the next library in the section data.
*/
nbytes -= entry_size;
phdr = (COFF_SLIBHD *) & ((char *) phdr)[entry_size];
}
out:
kfree(buffer);
return (err);
enoexec:
err = -ENOEXEC;
goto out;
}
/*
* 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);
}
/*
* Parse a comments section looking for clues as to the system this
* was compiled on so we can get the system call interface right.
*/
static int
coff_parse_comments(struct file *fp, COFF_SCNHDR *sect, long *personality)
{
u_long offset, nbytes;
int hits = 0, err;
char *buffer;
if (!(buffer = (char *)__get_free_page(GFP_KERNEL)))
return 0;
/*
* Fetch the size of the section. There must be something in there
* or the section wouldn't exist at all. We only bother with the
* first 8192 characters though. There isn't any point getting too
* carried away!
*/
if ((nbytes = COFF_LONG(sect->s_size)) > 8192)
nbytes = 8192;
offset = COFF_LONG(sect->s_scnptr);
while (nbytes > 0) {
u_long count, start = 0;
char *p;
err = kernel_read(fp, offset, buffer,
nbytes > PAGE_SIZE ? PAGE_SIZE : nbytes);
if (err <= 0) {
free_page((u_long) buffer);
return 0;
}
p = buffer;
for (count = 0; count < err; count++) {
coff_clue *clue;
char c;
c = *(buffer + PAGE_SIZE - 1);
*(buffer + PAGE_SIZE - 1) = '\0';
for (clue = coff_clues; clue->len; clue++) {
if ((clue->len < 0 && strstr(p, clue->text)) ||
(clue->len > 0 && !strncmp(p, clue->text, clue->len))) {
*personality &= clue->mask_and;
*personality |= clue->mask_or;
if (clue->terminal) {
free_page((u_long)buffer);
return 1;
}
hits++;
}
}
*(buffer + PAGE_SIZE - 1) = c;
while (*p && count < err)
p++, count++;
if (count < err) {
p++;
count++;
start = count;
}
}
/*
* If we didn't find an end ofstring at all this page
* probably isn't useful string data.
*/
if (start == 0)
start = err;
nbytes -= start;
offset += start;
}
free_page((u_long)buffer);
return (hits);
}
static int
preload_library (struct linux_binprm *exe_bprm,
COFF_SCNHDR * sect, struct file *fp)
{
int status = 0; /* Completion status */
long nbytes; /* Count of bytes in the header area */
/*
* Fetch the size of the section. There must be enough room for at least
* one entry.
*/
nbytes = COFF_LONG (sect->s_size);
if (nbytes < COFF_SLIBSZ) {
status = -ENOEXEC;
#ifdef COFF_DEBUG
printk ("library section too small\n");
#endif
}
/*
* Allocate a buffer to hold the section data
*/
else {
COFF_SLIBHD *phdr;
char *buffer = (char *) kmalloc (nbytes, GFP_KERNEL);
if (0 == buffer) {
status = -ENOEXEC;
#ifdef COFF_DEBUG
printk ("kmalloc failed\n");
#endif
}
else {
int old_fs = get_fs ();
/*
* Read the section data from the disk file.
*/
set_fs (get_ds ()); /* Make it point to the proper location */
status = read_exec (exe_bprm->inode, /* INODE for file */
COFF_LONG (sect->s_scnptr), /* Disk location */
buffer, /* Buffer for read */
nbytes); /* Byte count reqd. */
set_fs (old_fs); /* Restore the selector */
/*
* Check the result. The value returned is the byte count actually read.
*/
if (status >= 0 && status != nbytes) {
#ifdef COFF_DEBUG
printk ("read of lib section was short\n");
#endif
status = -ENOEXEC;
}
}
/*
* At this point, go through the list of libraries in the data area.
*/
phdr = (COFF_SLIBHD *) buffer;
while (status >= 0 && nbytes > COFF_SLIBSZ) {
int entry_size = COFF_LONG (phdr->sl_entsz) * sizeof (long);
int header_size = COFF_LONG (phdr->sl_pathndx) * sizeof (long);
/*
* Validate the sizes of the various items. I don't trust the linker!!
*/
if ((unsigned) header_size >= (unsigned) nbytes ||
entry_size <= 0 ||
(unsigned) entry_size <= (unsigned) header_size) {
status = -ENOEXEC;
#ifdef COFF_DEBUG
printk ("header count is invalid\n");
#endif
}
/*
* Load the library. Stop the load process on the first error.
*/
else {
status = preload_this_library (exe_bprm,
&((char *) phdr)[header_size]);
#ifdef COFF_DEBUG
printk ("preload_this_library result = %d\n", status);
#endif
}
/*
* Point to the next library in the section data.
*/
nbytes -= entry_size;
phdr = (COFF_SLIBHD *) &((char *) phdr)[entry_size];
}
/*
* Release the space for the library list.
*/
if (buffer != NULL)
kfree (buffer);
}
/*
* Return the resulting status to the caller.
*/
return (status);
}
static int
load_object (struct linux_binprm * bprm, struct pt_regs *regs, int lib_ok)
{
COFF_FILHDR *coff_hdr = (COFF_FILHDR *) bprm->buf; /* COFF Header */
COFF_SCNHDR *sect_bufr; /* Pointer to section table */
COFF_SCNHDR *text_sect; /* Pointer to the text section */
COFF_SCNHDR *data_sect; /* Pointer to the data section */
COFF_SCNHDR *bss_sect; /* Pointer to the bss section */
int text_count; /* Number of text sections */
int data_count; /* Number of data sections */
int bss_count; /* Number of bss sections */
int lib_count; /* Number of lib sections */
unsigned int start_addr = 0;/* Starting location for program */
int status = 0; /* Result status register */
int fd = -1; /* Open file descriptor */
struct file *fp = NULL; /* Pointer to the file at "fd" */
short int sections = 0; /* Number of sections in the file */
short int aout_size = 0; /* Size of the a.out header area */
short int flags; /* Flag bits from the COFF header */
#ifdef COFF_DEBUG
printk ("binfmt_coff entry: %s\n", bprm->filename);
#endif
/*
* Validate the magic value for the object file.
*/
do {
if (COFF_I386BADMAG (*coff_hdr)) {
#ifdef COFF_DEBUG
printk ("bad filehdr magic\n");
#endif
status = -ENOEXEC;
break;
}
/*
* 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.
*/
flags = COFF_SHORT (coff_hdr->f_flags);
if ((flags & (COFF_F_AR32WR | COFF_F_AR16WR)) != COFF_F_AR32WR) {
#ifdef COFF_DEBUG
printk ("invalid f_flags bits\n");
#endif
status = -ENOEXEC;
break;
}
/*
* 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 */
/*
* 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) {
#ifdef COFF_DEBUG
printk ("not executable bit\n");
#endif
status = -ENOEXEC;
break;
}
/*
* There must be at least one section.
*/
if (sections == 0) {
#ifdef COFF_DEBUG
printk ("no sections\n");
#endif
status = -ENOEXEC;
break;
}
/*
* Do some additional consistency checks.
* The system requires mapping for this loader. If you try
* to use a file system with no mapping, the format is not valid.
*/
if (!bprm->inode->i_op ||
!bprm->inode->i_op->default_file_ops->mmap) {
#ifdef COFF_DEBUG
printk ("no mmap in fs\n");
#endif
status = -ENOEXEC;
}
}
while (0);
/*
* Allocate a buffer to hold the entire coff section list.
*/
if (status >= 0) {
int nbytes = sections * COFF_SCNHSZ;
sect_bufr = (COFF_SCNHDR *) kmalloc (nbytes, GFP_KERNEL);
if (0 == sect_bufr) {
#ifdef COFF_DEBUG
printk ("kmalloc failed\n");
#endif
status = -ENOEXEC;
}
/*
* Read the section list from the disk file.
*/
else {
int old_fs = get_fs ();
set_fs (get_ds ()); /* Make it point to the proper location */
status = read_exec (bprm->inode, /* INODE for file */
aout_size + COFF_FILHSZ, /* Offset in the file */
(char *) sect_bufr, /* Buffer for read */
nbytes); /* Byte count reqd. */
set_fs (old_fs); /* Restore the selector */
#ifdef COFF_DEBUG
if (status < 0)
printk ("read aout hdr, status = %d\n", status);
#endif
}
}
else
sect_bufr = NULL; /* Errors do not have a section buffer */
/*
* Count the number of sections for the required types and store the location
* of the last section for the three primary types.
*/
text_count = 0;
data_count = 0;
bss_count = 0;
lib_count = 0;
text_sect = NULL;
data_sect = NULL;
bss_sect = NULL;
/*
* Loop through the sections and find the various types
*/
if (status >= 0) {
int nIndex;
COFF_SCNHDR *sect_ptr = sect_bufr;
for (nIndex = 0; nIndex < sections; ++nIndex) {
long int sect_flags = COFF_LONG (sect_ptr->s_flags);
switch (sect_flags) {
case COFF_STYP_TEXT:
text_sect = sect_ptr;
++text_count;
status = is_properly_aligned (sect_ptr);
break;
case COFF_STYP_DATA:
data_sect = sect_ptr;
++data_count;
status = is_properly_aligned (sect_ptr);
break;
case COFF_STYP_BSS:
bss_sect = sect_ptr;
++bss_count;
break;
case COFF_STYP_LIB:
#ifdef COFF_DEBUG
printk (".lib section found\n");
#endif
++lib_count;
break;
default:
break;
}
sect_ptr = (COFF_SCNHDR *) & ((char *) sect_ptr)[COFF_SCNHSZ];
}
/*
* 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;
#ifdef COFF_DEBUG
printk ("no text sections\n");
#endif
}
else {
if (lib_ok) {
if (data_count != 1 || bss_count != 1) {
status = -ENOEXEC;
#ifdef COFF_DEBUG
printk ("no .data nor .bss sections\n");
#endif
}
}
}
}
/*
* 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 (status >= 0) {
if (aout_size == 0) {
if (!lib_ok) {
status = -ENOEXEC;
#ifdef COFF_DEBUG
printk ("no header in library\n");
#endif
}
start_addr = COFF_LONG (text_sect->s_vaddr);
}
/*
* There is some header. Ensure that it is sufficient.
*/
else {
if (aout_size < COFF_AOUTSZ) {
status = -ENOEXEC;
#ifdef COFF_DEBUG
printk ("header too small\n");
#endif
}
else {
COFF_AOUTHDR *aout_hdr = /* Pointer to a.out header */
(COFF_AOUTHDR *) & ((char *) coff_hdr)[COFF_FILHSZ];
short int aout_magic = COFF_SHORT (aout_hdr->magic); /* id */
/*
* 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 (!lib_ok) {
status = -ENOEXEC;
#ifdef COFF_DEBUG
printk ("wrong a.out header magic\n");
#endif
}
start_addr = (unsigned 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 (lib_ok) {
#ifdef COFF_DEBUG
printk ("wrong a.out header magic\n");
#endif
status = -ENOEXEC;
}
break;
default:
#ifdef COFF_DEBUG
printk ("wrong a.out header magic\n");
#endif
status = -ENOEXEC;
break;
}
}
}
}
/*
* Fetch a file pointer to the executable.
*/
if (status >= 0) {
fd = open_inode (bprm->inode, O_RDONLY);
if (fd < 0) {
#ifdef COFF_DEBUG
printk ("can not open inode, result = %d\n", fd);
#endif
status = fd;
}
else
fp = current->files->fd[fd];
}
else
fd = -1; /* Invalidate the open file descriptor */
/*
* 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.
*/
if (status >= 0) {
long text_scnptr = COFF_LONG (text_sect->s_scnptr);
long text_size = COFF_LONG (text_sect->s_size);
long text_vaddr = COFF_LONG (text_sect->s_vaddr);
long data_scnptr;
long data_size;
long data_vaddr;
long bss_size;
long bss_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 (lib_ok) {
#ifdef COFF_DEBUG
printk ("flushing executable\n");
#endif
flush_old_exec (bprm);
/*
* Define the initial locations for the various items in the new process
*/
current->mm->mmap = NULL;
current->mm->rss = 0;
/*
* Construct the parameter and environment string table entries.
*/
bprm->p += change_ldt (0, bprm->page);
bprm->p -= MAX_ARG_PAGES*PAGE_SIZE;
bprm->p = (unsigned long) create_tables ((char *) bprm->p,
bprm->argc,
bprm->envc,
1);
/*
* Do the end processing once the stack has been constructed
*/
current->mm->start_code = text_vaddr & PAGE_MASK;
current->mm->end_code = text_vaddr + text_size;
current->mm->end_data = data_vaddr + data_size;
current->mm->start_brk =
current->mm->brk = bss_vaddr + bss_size;
current->suid =
current->euid = bprm->e_uid;
current->sgid =
current->egid = bprm->e_gid;
current->executable = bprm->inode; /* Store inode for file */
++bprm->inode->i_count; /* Count the open inode */
regs->eip = start_addr; /* Current EIP register */
regs->esp =
current->mm->start_stack = bprm->p;
}
/*
* Map the text pages
*/
#ifdef COFF_DEBUG
printk (".text: vaddr = %d, size = %d, scnptr = %d\n",
text_vaddr,
text_size,
text_scnptr);
#endif
status = do_mmap (fp,
text_vaddr & PAGE_MASK,
text_size + (text_vaddr & ~PAGE_MASK),
PROT_READ | PROT_EXEC,
MAP_FIXED | MAP_SHARED,
text_scnptr & PAGE_MASK);
status = (status == (text_vaddr & PAGE_MASK)) ? 0 : -ENOEXEC;
/*
* Map the data pages
*/
if (status >= 0 && data_size != 0) {
#ifdef COFF_DEBUG
printk (".data: vaddr = %d, size = %d, scnptr = %d\n",
data_vaddr,
data_size,
data_scnptr);
#endif
status = do_mmap (fp,
data_vaddr & PAGE_MASK,
data_size + (data_vaddr & ~PAGE_MASK),
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_FIXED | MAP_PRIVATE,
data_scnptr & PAGE_MASK);
status = (status == (data_vaddr & PAGE_MASK)) ? 0 : -ENOEXEC;
}
/*
* 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 (status >= 0 && bss_size != 0) {
#ifdef COFF_DEBUG
printk (".bss: vaddr = %d, size = %d\n",
bss_vaddr,
bss_size);
#endif
zeromap_page_range (PAGE_ALIGN (bss_vaddr),
PAGE_ALIGN (bss_size),
PAGE_COPY);
status = clear_memory (bss_vaddr, bss_size);
}
/*
* Load any shared library for the executable.
*/
if (status >= 0 && lib_ok && lib_count != 0) {
int nIndex;
COFF_SCNHDR *sect_ptr = sect_bufr;
/*
* Find the library sections. (There should be at least one. It was counted
* earlier.) This will eventually recurse to our code and load the shared
* library with our own procedures.
*/
for (nIndex = 0; nIndex < sections; ++nIndex) {
long int sect_flags = COFF_LONG (sect_ptr->s_flags);
if (sect_flags == COFF_STYP_LIB) {
status = preload_library (bprm, sect_ptr, fp);
if (status != 0)
break;
}
sect_ptr = (COFF_SCNHDR *) &((char *) sect_ptr) [COFF_SCNHSZ];
}
}
/*
* Generate any needed trap for this process. If an error occurred 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 (lib_ok) {
if (status < 0)
send_sig (SIGSEGV, current, 0); /* Generate the error trap */
else {
if (current->flags & PF_PTRACED)
send_sig (SIGTRAP, current, 0);
}
status = 0; /* We are committed. It can't fail */
}
}
/*
* Do any cleanup processing
*/
if (fd >= 0)
sys_close (fd); /* Close unused code file */
if (sect_bufr != NULL)
kfree (sect_bufr); /* Release section list buffer */
/*
* Return the completion status.
*/
#ifdef COFF_DEBUG
printk ("binfmt_coff: result = %d\n", status);
#endif
return (status);
}
