rename thread_info to stack

[powerpc.git] / fs / exec.c

diff --git a/fs/exec.c b/fs/exec.c
index 3155e91..1ba85c7 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -100,6 +100,7 @@ int unregister_binfmt(struct linux_binfmt * fmt)
        while (*tmp) {
                if (fmt == *tmp) {
                        *tmp = fmt->next;
+                       fmt->next = NULL;
                        write_unlock(&binfmt_lock);
                        return 0;
                }
@@ -982,33 +983,51 @@ void compute_creds(struct linux_binprm *bprm)
        task_unlock(current);
        security_bprm_post_apply_creds(bprm);
 }
-
 EXPORT_SYMBOL(compute_creds);
 
+/*
+ * Arguments are '\0' separated strings found at the location bprm->p
+ * points to; chop off the first by relocating brpm->p to right after
+ * the first '\0' encountered.
+ */
 void remove_arg_zero(struct linux_binprm *bprm)
 {
        if (bprm->argc) {
-               unsigned long offset;
-               char * kaddr;
-               struct page *page;
+               char ch;
 
-               offset = bprm->p % PAGE_SIZE;
-               goto inside;
+               do {
+                       unsigned long offset;
+                       unsigned long index;
+                       char *kaddr;
+                       struct page *page;
 
-               while (bprm->p++, *(kaddr+offset++)) {
-                       if (offset != PAGE_SIZE)
-                               continue;
-                       offset = 0;
-                       kunmap_atomic(kaddr, KM_USER0);
-inside:
-                       page = bprm->page[bprm->p/PAGE_SIZE];
+                       offset = bprm->p & ~PAGE_MASK;
+                       index = bprm->p >> PAGE_SHIFT;
+
+                       page = bprm->page[index];
                        kaddr = kmap_atomic(page, KM_USER0);
-               }
-               kunmap_atomic(kaddr, KM_USER0);
+
+                       /* run through page until we reach end or find NUL */
+                       do {
+                               ch = *(kaddr + offset);
+
+                               /* discard that character... */
+                               bprm->p++;
+                               offset++;
+                       } while (offset < PAGE_SIZE && ch != '\0');
+
+                       kunmap_atomic(kaddr, KM_USER0);
+
+                       /* free the old page */
+                       if (offset == PAGE_SIZE) {
+                               __free_page(page);
+                               bprm->page[index] = NULL;
+                       }
+               } while (ch != '\0');
+
                bprm->argc--;
        }
 }
-
 EXPORT_SYMBOL(remove_arg_zero);
 
 /*