+++ /dev/null
-/*
- * a.out loader for x86-64
- *
- * Copyright (C) 1991, 1992, 1996 Linus Torvalds
- * Hacked together by Andi Kleen
- */
-
-#include <linux/module.h>
-
-#include <linux/time.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>
-#include <asm/cacheflush.h>
-#include <asm/user32.h>
-#include <asm/ia32.h>
-
-#undef WARN_OLD
-#undef CORE_DUMP /* probably broken */
-
-static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
-static int load_aout_library(struct file*);
-
-#ifdef CORE_DUMP
-static int aout_core_dump(long signr, struct pt_regs * regs, struct file *file);
-
-/*
- * fill in the user structure for a core dump..
- */
-static void dump_thread32(struct pt_regs * regs, struct user32 * dump)
-{
- u32 fs,gs;
-
-/* changed the size calculations - should hopefully work better. lbt */
- dump->magic = CMAGIC;
- dump->start_code = 0;
- dump->start_stack = regs->rsp & ~(PAGE_SIZE - 1);
- dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
- dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
- dump->u_dsize -= dump->u_tsize;
- dump->u_ssize = 0;
- dump->u_debugreg[0] = current->thread.debugreg0;
- dump->u_debugreg[1] = current->thread.debugreg1;
- dump->u_debugreg[2] = current->thread.debugreg2;
- dump->u_debugreg[3] = current->thread.debugreg3;
- dump->u_debugreg[4] = 0;
- dump->u_debugreg[5] = 0;
- dump->u_debugreg[6] = current->thread.debugreg6;
- dump->u_debugreg[7] = current->thread.debugreg7;
-
- if (dump->start_stack < 0xc0000000)
- dump->u_ssize = ((unsigned long) (0xc0000000 - dump->start_stack)) >> PAGE_SHIFT;
-
- dump->regs.ebx = regs->rbx;
- dump->regs.ecx = regs->rcx;
- dump->regs.edx = regs->rdx;
- dump->regs.esi = regs->rsi;
- dump->regs.edi = regs->rdi;
- dump->regs.ebp = regs->rbp;
- dump->regs.eax = regs->rax;
- dump->regs.ds = current->thread.ds;
- dump->regs.es = current->thread.es;
- asm("movl %%fs,%0" : "=r" (fs)); dump->regs.fs = fs;
- asm("movl %%gs,%0" : "=r" (gs)); dump->regs.gs = gs;
- dump->regs.orig_eax = regs->orig_rax;
- dump->regs.eip = regs->rip;
- dump->regs.cs = regs->cs;
- dump->regs.eflags = regs->eflags;
- dump->regs.esp = regs->rsp;
- dump->regs.ss = regs->ss;
-
-#if 1 /* FIXME */
- dump->u_fpvalid = 0;
-#else
- dump->u_fpvalid = dump_fpu (regs, &dump->i387);
-#endif
-}
-
-#endif
-
-static struct linux_binfmt aout_format = {
- .module = THIS_MODULE,
- .load_binary = load_aout_binary,
- .load_shlib = load_aout_library,
-#ifdef CORE_DUMP
- .core_dump = aout_core_dump,
-#endif
- .min_coredump = 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);
-}
-
-#ifdef CORE_DUMP
-/*
- * 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 aout_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 user32 dump;
-# define START_DATA(u) (u.u_tsize << PAGE_SHIFT)
-# define START_STACK(u) (u.start_stack)
-
- fs = get_fs();
- set_fs(KERNEL_DS);
- has_dumped = 1;
- current->flags |= PF_DUMPCORE;
- strncpy(dump.u_comm, current->comm, sizeof(current->comm));
- dump.u_ar0 = (u32)(((unsigned long)(&dump.regs)) - ((unsigned long)(&dump)));
- dump.signal = signr;
- dump_thread32(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+1) * PAGE_SIZE >
- 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+1) * PAGE_SIZE >
- 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 *) (unsigned long)START_DATA(dump), dump.u_dsize << PAGE_SHIFT))
- dump.u_dsize = 0;
- if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump), dump.u_ssize << PAGE_SHIFT))
- dump.u_ssize = 0;
-
- set_fs(KERNEL_DS);
-/* struct user */
- DUMP_WRITE(&dump,sizeof(dump));
-/* Now dump all of the user data. Include malloced stuff as well */
- DUMP_SEEK(PAGE_SIZE);
-/* 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 << PAGE_SHIFT;
- 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 << PAGE_SHIFT;
- 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;
-}
-#endif
-
-/*
- * create_aout_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_aout_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(u32)) & (unsigned long) p);
- sp -= envc+1;
- envp = sp;
- sp -= argc+1;
- argv = sp;
- put_user((unsigned long) envp,--sp);
- put_user((unsigned long) 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(0, 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(0, 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_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) ||
- i_size_read(bprm->file->f_path.dentry->d_inode) < 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;
-
- regs->cs = __USER32_CS;
- regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
- regs->r13 = regs->r14 = regs->r15 = 0;
-
- /* OK, This is the point of no return */
- set_personality(PER_LINUX);
- set_thread_flag(TIF_IA32);
- clear_thread_flag(TIF_ABI_PENDING);
-
- 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 = TASK_UNMAPPED_BASE;
- current->mm->cached_hole_size = 0;
-
- current->mm->mmap = NULL;
- compute_creds(bprm);
- current->flags &= ~PF_FORKNOEXEC;
-
- if (N_MAGIC(ex) == OMAGIC) {
- unsigned long text_addr, map_size;
- loff_t pos;
-
- text_addr = N_TXTADDR(ex);
-
- pos = 32;
- map_size = ex.a_text+ex.a_data;
-
- down_write(¤t->mm->mmap_sem);
- error = do_brk(text_addr & PAGE_MASK, map_size);
- up_write(¤t->mm->mmap_sem);
-
- if (error != (text_addr & PAGE_MASK)) {
- send_sig(SIGKILL, current, 0);
- return error;
- }
-
- error = bprm->file->f_op->read(bprm->file,
- (char __user *)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 {
-#ifdef WARN_OLD
- 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_path.dentry->d_name.name);
- error_time = jiffies;
- }
-#endif
-
- if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
- loff_t pos = fd_offset;
- down_write(¤t->mm->mmap_sem);
- do_brk(N_TXTADDR(ex), 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);
- 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 | MAP_32BIT,
- 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 | MAP_32BIT,
- 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, IA32_STACK_TOP, EXSTACK_DEFAULT);
- 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 __user *)bprm->p, bprm);
- /* start thread */
- asm volatile("movl %0,%%fs" :: "r" (0)); \
- asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS));
- load_gs_index(0);
- (regs)->rip = ex.a_entry;
- (regs)->rsp = current->mm->start_stack;
- (regs)->eflags = 0x200;
- (regs)->cs = __USER32_CS;
- (regs)->ss = __USER32_DS;
- set_fs(USER_DS);
- 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);
- }
- return 0;
-}
-
-static int load_aout_library(struct file *file)
-{
- struct inode * inode;
- unsigned long bss, start_addr, len;
- unsigned long error;
- int retval;
- struct exec ex;
-
- inode = file->f_path.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) ||
- i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
- 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;
-
- if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
- loff_t pos = N_TXTOFF(ex);
-
-#ifdef WARN_OLD
- static unsigned long error_time;
- if ((jiffies-error_time) > 5*HZ)
- {
- printk(KERN_WARNING
- "N_TXTOFF is not page aligned. Please convert library: %s\n",
- file->f_path.dentry->d_name.name);
- error_time = jiffies;
- }
-#endif
- down_write(¤t->mm->mmap_sem);
- do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
- up_write(¤t->mm->mmap_sem);
-
- file->f_op->read(file, (char __user *)start_addr,
- ex.a_text + ex.a_data, &pos);
- flush_icache_range((unsigned long) start_addr,
- (unsigned long) start_addr + ex.a_text + ex.a_data);
-
- retval = 0;
- goto out;
- }
- /* 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 | MAP_32BIT,
- 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_aout_binfmt(void)
-{
- return register_binfmt(&aout_format);
-}
-
-static void __exit exit_aout_binfmt(void)
-{
- unregister_binfmt(&aout_format);
-}
-
-module_init(init_aout_binfmt);
-module_exit(exit_aout_binfmt);
-MODULE_LICENSE("GPL");
git.openpandora.org / pandora-kernel.git / blobdiff