1 files changed, 528 insertions, 0 deletions

diff --git a/arch/x86/ia32/ia32_aout.c b/arch/x86/ia32/ia32_aout.c
new file mode 100644
index 000000000000..08781370256d
--- /dev/null
+++ b/arch/x86/ia32/ia32_aout.c
@@ -0,0 +1,528 @@
+/*
+ *  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(&current->mm->mmap_sem);
+        do_brk(start, end - start);
+        up_write(&current->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(&current->mm->mmap_sem);
+                error = do_brk(text_addr & PAGE_MASK, map_size);
+                up_write(&current->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(&current->mm->mmap_sem);
+                        do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
+                        up_write(&current->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(&current->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(&current->mm->mmap_sem);
+
+                if (error != N_TXTADDR(ex)) {
+                        send_sig(SIGKILL, current, 0);
+                        return error;
+                }
+
+                down_write(&current->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(&current->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(&current->mm->mmap_sem);
+                do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
+                up_write(&current->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(&current->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(&current->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(&current->mm->mmap_sem);
+                error = do_brk(start_addr + len, bss - len);
+                up_write(&current->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");