block: export 'ro' sysfs attribute for partitions

[pandora-kernel.git] / fs / exec.c

diff --git a/fs/exec.c b/fs/exec.c
index 2d94552..6d2b6f9 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -376,6 +376,9 @@ static int count(const char __user * const __user * argv, int max)
                        argv++;
                        if (i++ >= max)
                                return -E2BIG;
+
+                       if (fatal_signal_pending(current))
+                               return -ERESTARTNOHAND;
                        cond_resched();
                }
        }
@@ -419,6 +422,12 @@ static int copy_strings(int argc, const char __user *const __user *argv,
                while (len > 0) {
                        int offset, bytes_to_copy;
 
+                       if (fatal_signal_pending(current)) {
+                               ret = -ERESTARTNOHAND;
+                               goto out;
+                       }
+                       cond_resched();
+
                        offset = pos % PAGE_SIZE;
                        if (offset == 0)
                                offset = PAGE_SIZE;
@@ -594,6 +603,11 @@ int setup_arg_pages(struct linux_binprm *bprm,
 #else
        stack_top = arch_align_stack(stack_top);
        stack_top = PAGE_ALIGN(stack_top);
+
+       if (unlikely(stack_top < mmap_min_addr) ||
+           unlikely(vma->vm_end - vma->vm_start >= stack_top - mmap_min_addr))
+               return -ENOMEM;
+
        stack_shift = vma->vm_end - stack_top;
 
        bprm->p -= stack_shift;
@@ -2000,3 +2014,43 @@ fail_creds:
 fail:
        return;
 }
+
+/*
+ * Core dumping helper functions.  These are the only things you should
+ * do on a core-file: use only these functions to write out all the
+ * necessary info.
+ */
+int dump_write(struct file *file, const void *addr, int nr)
+{
+       return access_ok(VERIFY_READ, addr, nr) && file->f_op->write(file, addr, nr, &file->f_pos) == nr;
+}
+EXPORT_SYMBOL(dump_write);
+
+int dump_seek(struct file *file, loff_t off)
+{
+       int ret = 1;
+
+       if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
+               if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
+                       return 0;
+       } else {
+               char *buf = (char *)get_zeroed_page(GFP_KERNEL);
+
+               if (!buf)
+                       return 0;
+               while (off > 0) {
+                       unsigned long n = off;
+
+                       if (n > PAGE_SIZE)
+                               n = PAGE_SIZE;
+                       if (!dump_write(file, buf, n)) {
+                               ret = 0;
+                               break;
+                       }
+                       off -= n;
+               }
+               free_page((unsigned long)buf);
+       }
+       return ret;
+}
+EXPORT_SYMBOL(dump_seek);