mm: task dirty accounting fix

[safe/jmp/linux-2.6] / fs / exec.c

diff --git a/fs/exec.c b/fs/exec.c
index 6ca4e3d..929b580 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -99,7 +99,7 @@ static inline void put_binfmt(struct linux_binfmt * fmt)
  *
  * Also note that we take the address to load from from the file itself.
  */
-asmlinkage long sys_uselib(const char __user * library)
+SYSCALL_DEFINE1(uselib, const char __user *, library)
 {
        struct file *file;
        struct nameidata nd;
@@ -1049,16 +1049,32 @@ EXPORT_SYMBOL(install_exec_creds);
  * - the caller must hold current->cred_exec_mutex to protect against
  *   PTRACE_ATTACH
  */
-void check_unsafe_exec(struct linux_binprm *bprm)
+void check_unsafe_exec(struct linux_binprm *bprm, struct files_struct *files)
 {
-       struct task_struct *p = current;
+       struct task_struct *p = current, *t;
+       unsigned long flags;
+       unsigned n_fs, n_files, n_sighand;
 
        bprm->unsafe = tracehook_unsafe_exec(p);
 
-       if (atomic_read(&p->fs->count) > 1 ||
-           atomic_read(&p->files->count) > 1 ||
-           atomic_read(&p->sighand->count) > 1)
+       n_fs = 1;
+       n_files = 1;
+       n_sighand = 1;
+       lock_task_sighand(p, &flags);
+       for (t = next_thread(p); t != p; t = next_thread(t)) {
+               if (t->fs == p->fs)
+                       n_fs++;
+               if (t->files == files)
+                       n_files++;
+               n_sighand++;
+       }
+
+       if (atomic_read(&p->fs->count) > n_fs ||
+           atomic_read(&p->files->count) > n_files ||
+           atomic_read(&p->sighand->count) > n_sighand)
                bprm->unsafe |= LSM_UNSAFE_SHARE;
+
+       unlock_task_sighand(p, &flags);
 }
 
 /* 
@@ -1273,7 +1289,7 @@ int do_execve(char * filename,
        bprm->cred = prepare_exec_creds();
        if (!bprm->cred)
                goto out_unlock;
-       check_unsafe_exec(bprm);
+       check_unsafe_exec(bprm, displaced);
 
        file = open_exec(filename);
        retval = PTR_ERR(file);
@@ -1686,7 +1702,7 @@ int get_dumpable(struct mm_struct *mm)
        return (ret >= 2) ? 2 : ret;
 }
 
-int do_coredump(long signr, int exit_code, struct pt_regs * regs)
+void do_coredump(long signr, int exit_code, struct pt_regs *regs)
 {
        struct core_state core_state;
        char corename[CORENAME_MAX_SIZE + 1];
@@ -1770,6 +1786,11 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
 
        if (ispipe) {
                helper_argv = argv_split(GFP_KERNEL, corename+1, &helper_argc);
+               if (!helper_argv) {
+                       printk(KERN_WARNING "%s failed to allocate memory\n",
+                              __func__);
+                       goto fail_unlock;
+               }
                /* Terminate the string before the first option */
                delimit = strchr(corename, ' ');
                if (delimit)
@@ -1837,5 +1858,5 @@ fail_unlock:
        put_cred(cred);
        coredump_finish(mm);
 fail:
-       return retval;
+       return;
 }