422 lines
12 KiB
C
422 lines
12 KiB
C
/*
|
|
* linux/fs/binfmt_aout.c
|
|
*
|
|
* Copyright (C) 1991, 1992, 1996 Linus Torvalds
|
|
*
|
|
* Hacked a bit by DaveM to make it work with 32-bit SunOS
|
|
* binaries on the sparc64 port.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/a.out.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/string.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/file.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/user.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/binfmts.h>
|
|
#include <linux/personality.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/pgalloc.h>
|
|
|
|
static int load_aout32_binary(struct linux_binprm *, struct pt_regs * regs);
|
|
static int load_aout32_library(struct file*);
|
|
static int aout32_core_dump(long signr, struct pt_regs * regs, struct file *file);
|
|
|
|
static struct linux_binfmt aout32_format = {
|
|
NULL, THIS_MODULE, load_aout32_binary, load_aout32_library, aout32_core_dump,
|
|
PAGE_SIZE
|
|
};
|
|
|
|
static void set_brk(unsigned long start, unsigned long end)
|
|
{
|
|
start = PAGE_ALIGN(start);
|
|
end = PAGE_ALIGN(end);
|
|
if (end <= start)
|
|
return;
|
|
down_write(¤t->mm->mmap_sem);
|
|
do_brk(start, end - start);
|
|
up_write(¤t->mm->mmap_sem);
|
|
}
|
|
|
|
/*
|
|
* These are the only things you should do on a core-file: use only these
|
|
* macros to write out all the necessary info.
|
|
*/
|
|
|
|
static int dump_write(struct file *file, const void *addr, int nr)
|
|
{
|
|
return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
|
|
}
|
|
|
|
#define DUMP_WRITE(addr, nr) \
|
|
if (!dump_write(file, (void *)(addr), (nr))) \
|
|
goto end_coredump;
|
|
|
|
#define DUMP_SEEK(offset) \
|
|
if (file->f_op->llseek) { \
|
|
if (file->f_op->llseek(file,(offset),0) != (offset)) \
|
|
goto end_coredump; \
|
|
} else file->f_pos = (offset)
|
|
|
|
/*
|
|
* Routine writes a core dump image in the current directory.
|
|
* Currently only a stub-function.
|
|
*
|
|
* Note that setuid/setgid files won't make a core-dump if the uid/gid
|
|
* changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
|
|
* field, which also makes sure the core-dumps won't be recursive if the
|
|
* dumping of the process results in another error..
|
|
*/
|
|
|
|
static int aout32_core_dump(long signr, struct pt_regs *regs, struct file *file)
|
|
{
|
|
mm_segment_t fs;
|
|
int has_dumped = 0;
|
|
unsigned long dump_start, dump_size;
|
|
struct user dump;
|
|
# define START_DATA(u) (u.u_tsize)
|
|
# define START_STACK(u) ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))
|
|
|
|
fs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
has_dumped = 1;
|
|
current->flags |= PF_DUMPCORE;
|
|
strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
|
|
dump.signal = signr;
|
|
dump_thread(regs, &dump);
|
|
|
|
/* If the size of the dump file exceeds the rlimit, then see what would happen
|
|
if we wrote the stack, but not the data area. */
|
|
if ((dump.u_dsize+dump.u_ssize) >
|
|
current->signal->rlim[RLIMIT_CORE].rlim_cur)
|
|
dump.u_dsize = 0;
|
|
|
|
/* Make sure we have enough room to write the stack and data areas. */
|
|
if ((dump.u_ssize) >
|
|
current->signal->rlim[RLIMIT_CORE].rlim_cur)
|
|
dump.u_ssize = 0;
|
|
|
|
/* make sure we actually have a data and stack area to dump */
|
|
set_fs(USER_DS);
|
|
if (!access_ok(VERIFY_READ, (void __user *) START_DATA(dump), dump.u_dsize))
|
|
dump.u_dsize = 0;
|
|
if (!access_ok(VERIFY_READ, (void __user *) START_STACK(dump), dump.u_ssize))
|
|
dump.u_ssize = 0;
|
|
|
|
set_fs(KERNEL_DS);
|
|
/* struct user */
|
|
DUMP_WRITE(&dump,sizeof(dump));
|
|
/* now we start writing out the user space info */
|
|
set_fs(USER_DS);
|
|
/* Dump the data area */
|
|
if (dump.u_dsize != 0) {
|
|
dump_start = START_DATA(dump);
|
|
dump_size = dump.u_dsize;
|
|
DUMP_WRITE(dump_start,dump_size);
|
|
}
|
|
/* Now prepare to dump the stack area */
|
|
if (dump.u_ssize != 0) {
|
|
dump_start = START_STACK(dump);
|
|
dump_size = dump.u_ssize;
|
|
DUMP_WRITE(dump_start,dump_size);
|
|
}
|
|
/* Finally dump the task struct. Not be used by gdb, but could be useful */
|
|
set_fs(KERNEL_DS);
|
|
DUMP_WRITE(current,sizeof(*current));
|
|
end_coredump:
|
|
set_fs(fs);
|
|
return has_dumped;
|
|
}
|
|
|
|
/*
|
|
* create_aout32_tables() parses the env- and arg-strings in new user
|
|
* memory and creates the pointer tables from them, and puts their
|
|
* addresses on the "stack", returning the new stack pointer value.
|
|
*/
|
|
|
|
static u32 __user *create_aout32_tables(char __user *p, struct linux_binprm *bprm)
|
|
{
|
|
u32 __user *argv;
|
|
u32 __user *envp;
|
|
u32 __user *sp;
|
|
int argc = bprm->argc;
|
|
int envc = bprm->envc;
|
|
|
|
sp = (u32 __user *)((-(unsigned long)sizeof(char *))&(unsigned long)p);
|
|
|
|
/* This imposes the proper stack alignment for a new process. */
|
|
sp = (u32 __user *) (((unsigned long) sp) & ~7);
|
|
if ((envc+argc+3)&1)
|
|
--sp;
|
|
|
|
sp -= envc+1;
|
|
envp = sp;
|
|
sp -= argc+1;
|
|
argv = sp;
|
|
put_user(argc,--sp);
|
|
current->mm->arg_start = (unsigned long) p;
|
|
while (argc-->0) {
|
|
char c;
|
|
put_user(((u32)(unsigned long)(p)),argv++);
|
|
do {
|
|
get_user(c,p++);
|
|
} while (c);
|
|
}
|
|
put_user(NULL,argv);
|
|
current->mm->arg_end = current->mm->env_start = (unsigned long) p;
|
|
while (envc-->0) {
|
|
char c;
|
|
put_user(((u32)(unsigned long)(p)),envp++);
|
|
do {
|
|
get_user(c,p++);
|
|
} while (c);
|
|
}
|
|
put_user(NULL,envp);
|
|
current->mm->env_end = (unsigned long) p;
|
|
return sp;
|
|
}
|
|
|
|
/*
|
|
* These are the functions used to load a.out style executables and shared
|
|
* libraries. There is no binary dependent code anywhere else.
|
|
*/
|
|
|
|
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_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->mmap = NULL;
|
|
compute_creds(bprm);
|
|
current->flags &= ~PF_FORKNOEXEC;
|
|
if (N_MAGIC(ex) == NMAGIC) {
|
|
loff_t pos = fd_offset;
|
|
/* Fuck 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);
|
|
if (!(orig_thr_flags & _TIF_32BIT)) {
|
|
unsigned long pgd_cache = get_pgd_cache(current->mm->pgd);
|
|
|
|
__asm__ __volatile__("stxa\t%0, [%1] %2\n\t"
|
|
"membar #Sync"
|
|
: /* no outputs */
|
|
: "r" (pgd_cache),
|
|
"r" (TSB_REG), "i" (ASI_DMMU));
|
|
}
|
|
start_thread32(regs, ex.a_entry, current->mm->start_stack);
|
|
if (current->ptrace & PT_PTRACED)
|
|
send_sig(SIGTRAP, current, 0);
|
|
return 0;
|
|
}
|
|
|
|
/* N.B. Move to .h file and use code in fs/binfmt_aout.c? */
|
|
static int load_aout32_library(struct file *file)
|
|
{
|
|
struct inode * inode;
|
|
unsigned long bss, start_addr, len;
|
|
unsigned long error;
|
|
int retval;
|
|
struct exec ex;
|
|
|
|
inode = file->f_dentry->d_inode;
|
|
|
|
retval = -ENOEXEC;
|
|
error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
|
|
if (error != sizeof(ex))
|
|
goto out;
|
|
|
|
/* We come in here for the regular a.out style of shared libraries */
|
|
if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
|
|
N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
|
|
inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
|
|
goto out;
|
|
}
|
|
|
|
if (N_MAGIC(ex) == ZMAGIC && N_TXTOFF(ex) &&
|
|
(N_TXTOFF(ex) < inode->i_sb->s_blocksize)) {
|
|
printk("N_TXTOFF < BLOCK_SIZE. Please convert library\n");
|
|
goto out;
|
|
}
|
|
|
|
if (N_FLAGS(ex))
|
|
goto out;
|
|
|
|
/* For QMAGIC, the starting address is 0x20 into the page. We mask
|
|
this off to get the starting address for the page */
|
|
|
|
start_addr = ex.a_entry & 0xfffff000;
|
|
|
|
/* Now use mmap to map the library into memory. */
|
|
down_write(¤t->mm->mmap_sem);
|
|
error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
|
|
PROT_READ | PROT_WRITE | PROT_EXEC,
|
|
MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
|
|
N_TXTOFF(ex));
|
|
up_write(¤t->mm->mmap_sem);
|
|
retval = error;
|
|
if (error != start_addr)
|
|
goto out;
|
|
|
|
len = PAGE_ALIGN(ex.a_text + ex.a_data);
|
|
bss = ex.a_text + ex.a_data + ex.a_bss;
|
|
if (bss > len) {
|
|
down_write(¤t->mm->mmap_sem);
|
|
error = do_brk(start_addr + len, bss - len);
|
|
up_write(¤t->mm->mmap_sem);
|
|
retval = error;
|
|
if (error != start_addr + len)
|
|
goto out;
|
|
}
|
|
retval = 0;
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static int __init init_aout32_binfmt(void)
|
|
{
|
|
return register_binfmt(&aout32_format);
|
|
}
|
|
|
|
static void __exit exit_aout32_binfmt(void)
|
|
{
|
|
unregister_binfmt(&aout32_format);
|
|
}
|
|
|
|
module_init(init_aout32_binfmt);
|
|
module_exit(exit_aout32_binfmt);
|