Hi Linus :)
This is a correction for a patch I sent you that you included in
the 2.5.x tree. The patch I sent you fixed a corner case for the
mmap() syscall, where the requested size was too big (namely, bigger
than SIZE_MAX-PAGE_SIZE). Unfortunately, the patch did a wrong
assumption that is not true in some archs where TASK_SIZE is the full
address space available, as sparc64. So, the patch didn't fix
anything on those archs :((
David S. Miller <davem@redhat.com> pointed this and made this new
patch that fixes the spot. Now it should work in all archs.
If you have any doubt, just tell.
Raśl
--6zdv2QT/q3FMhpsV
Content-Type: text/plain; charset=iso-8859-1
Content-Description: mmap.c.diff
Content-Disposition: attachment; filename="mmap.c.2.5.51.diff"
--- linux/mm/mmap.c.orig 2002-12-11 14:27:04.000000000 +0100
+++ linux/mm/mmap.c 2002-12-11 14:28:09.000000000 +0100
@@ -421,14 +421,14 @@
if (file && (!file->f_op || !file->f_op->mmap))
return -ENODEV;
- if (!len)
+ if (len == 0)
return addr;
- if (len > TASK_SIZE)
- return -EINVAL;
-
len = PAGE_ALIGN(len);
+ if (len > TASK_SIZE || len == 0)
+ return -EINVAL;
+
/* offset overflow? */
if ((pgoff + (len >> PAGE_SHIFT)) < pgoff)
return -EINVAL;
--6zdv2QT/q3FMhpsV--
-
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