[uml-devel] Patch for arch/um/kernel/trap_kern.c to fix bad panic

[azu <azu@sysgo.de>]

Hi,

I triggered the following panic from userspace in skas mode
by mapping pages above 0xa0000000 ...

The check is useless in skas-mode (kernel faults get filtered
in segv() before handle_page_fault() is called),
so I added an ifdef for tt mode.


-Alex


--- orig/arch/um/kernel/trap_kern.c     2004-06-28 13:08:41.000000000 +0200
+++ u4/arch/um/kernel/trap_kern.c       2004-06-28 13:08:52.000000000 +0200
@@ -52,8 +52,10 @@
         if(is_write && !(vma->vm_flags & VM_WRITE))
                 goto out;
         page = address & PAGE_MASK;
+#ifdef CONFIG_MODE_TT
         if(page == (unsigned long) current + PAGE_SIZE)
                 panic("Kernel stack overflow");
+#endif
         pgd = pgd_offset(mm, page);
         pmd = pmd_offset(pgd, page);
         do {




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