[PATCH] x86_64: access of some bad address
authorHugh Dickins <hugh@veritas.com>
Tue, 2 Aug 2005 04:11:42 +0000 (21:11 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Tue, 2 Aug 2005 04:38:00 +0000 (21:38 -0700)
x86_64 has a large sparse gate area between VSYSCALL_START and
VSYSCALL_END, not all of it presently backed by pmds.  Alexander Nyberg has
found that in some circumstances gdb may try to ptrace here, and hit
get_user_pages BUG_ON.  It seems odd that gdb should be accessing here, but
it certainly shouldn't crash in this way: relax BUG_ON to -EFAULT.  Fixes
kernel bugzilla #4801.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
mm/memory.c

index 4e1c673..2405289 100644 (file)
@@ -910,9 +910,13 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
                        pud = pud_offset(pgd, pg);
                        BUG_ON(pud_none(*pud));
                        pmd = pmd_offset(pud, pg);
-                       BUG_ON(pmd_none(*pmd));
+                       if (pmd_none(*pmd))
+                               return i ? : -EFAULT;
                        pte = pte_offset_map(pmd, pg);
-                       BUG_ON(pte_none(*pte));
+                       if (pte_none(*pte)) {
+                               pte_unmap(pte);
+                               return i ? : -EFAULT;
+                       }
                        if (pages) {
                                pages[i] = pte_page(*pte);
                                get_page(pages[i]);