patch-2.3.36 linux/fs/exec.c

• Lines: 42
• Date: Wed Dec 29 11:42:07 1999
• Orig file: v2.3.35/linux/fs/exec.c
• Orig date: Mon Dec 20 18:48:22 1999

diff -u --recursive --new-file v2.3.35/linux/fs/exec.c linux/fs/exec.c
@@ -261,6 +261,41 @@
 	return r; 
 }
 
+/*
+ * This routine is used to map in a page into an address space: needed by
+ * execve() for the initial stack and environment pages.
+ */
+static void put_dirty_page(struct task_struct * tsk, struct page *page, unsigned long address)
+{
+	pgd_t * pgd;
+	pmd_t * pmd;
+	pte_t * pte;
+
+	if (page_count(page) != 1)
+		printk("mem_map disagrees with %p at %08lx\n", page, address);
+	pgd = pgd_offset(tsk->mm, address);
+	pmd = pmd_alloc(pgd, address);
+	if (!pmd) {
+		__free_page(page);
+		oom(tsk);
+		return;
+	}
+	pte = pte_alloc(pmd, address);
+	if (!pte) {
+		__free_page(page);
+		oom(tsk);
+		return;
+	}
+	if (!pte_none(*pte)) {
+		pte_ERROR(*pte);
+		__free_page(page);
+		return;
+	}
+	flush_page_to_ram(page);
+	set_pte(pte, pte_mkdirty(pte_mkwrite(mk_pte(page, PAGE_COPY))));
+/* no need for flush_tlb */
+}
+
 int setup_arg_pages(struct linux_binprm *bprm)
 {
 	unsigned long stack_base;