ext2: change the default behaviour on error

[linux-2.6-omap-h63xx.git] / fs / exec.c

diff --git a/fs/exec.c b/fs/exec.c
index aa470a93540a727f127c6a474e65f63b438461f7..be923e4bc38972954325aee09363cb38bff60884 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -64,7 +64,6 @@ int core_uses_pid;
 char core_pattern[CORENAME_MAX_SIZE] = "core";
 int suid_dumpable = 0;
 
-EXPORT_SYMBOL(suid_dumpable);
 /* The maximal length of core_pattern is also specified in sysctl.c */
 
 static LIST_HEAD(formats);
@@ -235,7 +234,7 @@ static int __bprm_mm_init(struct linux_binprm *bprm)
        vma->vm_start = vma->vm_end - PAGE_SIZE;
 
        vma->vm_flags = VM_STACK_FLAGS;
-       vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
+       vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
        err = insert_vm_struct(mm, vma);
        if (err) {
                up_write(&mm->mmap_sem);
@@ -761,7 +760,7 @@ static int de_thread(struct task_struct *tsk)
         */
        read_lock(&tasklist_lock);
        spin_lock_irq(lock);
-       if (sig->flags & SIGNAL_GROUP_EXIT) {
+       if (signal_group_exit(sig)) {
                /*
                 * Another group action in progress, just
                 * return so that the signal is processed.
@@ -776,9 +775,10 @@ static int de_thread(struct task_struct *tsk)
         * Reparenting needs write_lock on tasklist_lock,
         * so it is safe to do it under read_lock.
         */
-       if (unlikely(tsk->group_leader == child_reaper(tsk)))
-               tsk->nsproxy->pid_ns->child_reaper = tsk;
+       if (unlikely(tsk->group_leader == task_child_reaper(tsk)))
+               task_active_pid_ns(tsk)->child_reaper = tsk;
 
+       sig->group_exit_task = tsk;
        zap_other_threads(tsk);
        read_unlock(&tasklist_lock);
 
@@ -803,7 +803,6 @@ static int de_thread(struct task_struct *tsk)
        }
 
        sig->notify_count = count;
-       sig->group_exit_task = tsk;
        while (atomic_read(&sig->count) > count) {
                __set_current_state(TASK_UNINTERRUPTIBLE);
                spin_unlock_irq(lock);
@@ -842,8 +841,8 @@ static int de_thread(struct task_struct *tsk)
                 */
                tsk->start_time = leader->start_time;
 
-               BUG_ON(leader->tgid != tsk->tgid);
-               BUG_ON(tsk->pid == tsk->tgid);
+               BUG_ON(!same_thread_group(leader, tsk));
+               BUG_ON(has_group_leader_pid(tsk));
                /*
                 * An exec() starts a new thread group with the
                 * TGID of the previous thread group. Rehash the
@@ -858,7 +857,7 @@ static int de_thread(struct task_struct *tsk)
                 */
                detach_pid(tsk, PIDTYPE_PID);
                tsk->pid = leader->pid;
-               attach_pid(tsk, PIDTYPE_PID,  find_pid(tsk->pid));
+               attach_pid(tsk, PIDTYPE_PID,  task_pid(leader));
                transfer_pid(leader, tsk, PIDTYPE_PGID);
                transfer_pid(leader, tsk, PIDTYPE_SID);
                list_replace_rcu(&leader->tasks, &tsk->tasks);
@@ -872,15 +871,10 @@ static int de_thread(struct task_struct *tsk)
                leader->exit_state = EXIT_DEAD;
 
                write_unlock_irq(&tasklist_lock);
-        }
+       }
 
        sig->group_exit_task = NULL;
        sig->notify_count = 0;
-       /*
-        * There may be one thread left which is just exiting,
-        * but it's safe to stop telling the group to kill themselves.
-        */
-       sig->flags = 0;
 
 no_thread_group:
        exit_itimers(sig);
@@ -948,12 +942,13 @@ static void flush_old_files(struct files_struct * files)
        spin_unlock(&files->file_lock);
 }
 
-void get_task_comm(char *buf, struct task_struct *tsk)
+char *get_task_comm(char *buf, struct task_struct *tsk)
 {
        /* buf must be at least sizeof(tsk->comm) in size */
        task_lock(tsk);
        strncpy(buf, tsk->comm, sizeof(tsk->comm));
        task_unlock(tsk);
+       return buf;
 }
 
 void set_task_comm(struct task_struct *tsk, char *buf)
@@ -1434,7 +1429,7 @@ static int format_corename(char *corename, const char *pattern, long signr)
                        case 'p':
                                pid_in_pattern = 1;
                                rc = snprintf(out_ptr, out_end - out_ptr,
-                                             "%d", current->tgid);
+                                             "%d", task_tgid_vnr(current));
                                if (rc > out_end - out_ptr)
                                        goto out;
                                out_ptr += rc;
@@ -1514,7 +1509,7 @@ static int format_corename(char *corename, const char *pattern, long signr)
        if (!ispipe && !pid_in_pattern
             && (core_uses_pid || atomic_read(&current->mm->mm_users) != 1)) {
                rc = snprintf(out_ptr, out_end - out_ptr,
-                             ".%d", current->tgid);
+                             ".%d", task_tgid_vnr(current));
                if (rc > out_end - out_ptr)
                        goto out;
                out_ptr += rc;
@@ -1549,7 +1544,7 @@ static inline int zap_threads(struct task_struct *tsk, struct mm_struct *mm,
        int err = -EAGAIN;
 
        spin_lock_irq(&tsk->sighand->siglock);
-       if (!(tsk->signal->flags & SIGNAL_GROUP_EXIT)) {
+       if (!signal_group_exit(tsk->signal)) {
                tsk->signal->group_exit_code = exit_code;
                zap_process(tsk);
                err = 0;
@@ -1662,7 +1657,6 @@ void set_dumpable(struct mm_struct *mm, int value)
                break;
        }
 }
-EXPORT_SYMBOL_GPL(set_dumpable);
 
 int get_dumpable(struct mm_struct *mm)
 {
@@ -1694,7 +1688,10 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
        if (!binfmt || !binfmt->core_dump)
                goto fail;
        down_write(&mm->mmap_sem);
-       if (!get_dumpable(mm)) {
+       /*
+        * If another thread got here first, or we are not dumpable, bail out.
+        */
+       if (mm->core_waiters || !get_dumpable(mm)) {
                up_write(&mm->mmap_sem);
                goto fail;
        }
@@ -1708,7 +1705,6 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
                flag = O_EXCL;          /* Stop rewrite attacks */
                current->fsuid = 0;     /* Dump root private */
        }
-       set_dumpable(mm, 0);
 
        retval = coredump_wait(exit_code);
        if (retval < 0)
@@ -1780,6 +1776,12 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
           but keep the previous behaviour for now. */
        if (!ispipe && !S_ISREG(inode->i_mode))
                goto close_fail;
+       /*
+        * Dont allow local users get cute and trick others to coredump
+        * into their pre-created files:
+        */
+       if (inode->i_uid != current->fsuid)
+               goto close_fail;
        if (!file->f_op)
                goto close_fail;
        if (!file->f_op->write)