+ uml-update-address-space-affected-by-pud_clear.patch added to -mm tree

+ uml-update-address-space-affected-by-pud_clear.patch added to -mm tree

[akpm]

The patch titled
     uml: update address space affected by pud_clear
has been added to the -mm tree.  Its filename is
     uml-update-address-space-affected-by-pud_clear.patch

*** Remember to use Documentation/SubmitChecklist when testing your code ***

See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this

------------------------------------------------------
Subject: uml: update address space affected by pud_clear
From: Jeff Dike <jdike@addtoit.com>

pud_clear wasn't setting the _PAGE_NEWPAGE bit, fooling tlb_flush into
thinking that this area of the address space was up-to-date and not unmapping
whatever was covered by the pud.

This manifested itself as ldconfig on x86_64 complaining about the first
library it looked at not being a valid ELF file.  A config file is mapped at
0x4000000, as the only thing mapped under its pud, and unmapped.  The
unmapping caused a pud_clear, which, due to this bug, didn't actually unmap
the config file data on the host.  The first library is then mapped at the
same location, but is not actually mapped on the host because accesses to it
cause no page faults.  As a result, ldconfig sees the old config file data.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/asm-um/pgtable-3level.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN include/asm-um/pgtable-3level.h~uml-update-address-space-affected-by-pud_clear include/asm-um/pgtable-3level.h
--- a/include/asm-um/pgtable-3level.h~uml-update-address-space-affected-by-pud_clear
+++ a/include/asm-um/pgtable-3level.h
@@ -71,7 +71,7 @@ static inline pmd_t *pmd_alloc_one(struc
 
 static inline void pud_clear (pud_t *pud)
 {
-        set_pud(pud, __pud(0));
+        set_pud(pud, __pud(_PAGE_NEWPAGE));
 }
 
 #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)
_

Patches currently in -mm which might be from jdike@addtoit.com are

uml-fix-symlink-loops.patch
uml-fix-recvmsg-return-value-checking.patch
uml-update-address-space-affected-by-pud_clear.patch
git-kvm.patch
uml-fix-spurious-irq-testing.patch
uml-remove-last-include-of-libc-asm-pageh.patch
uml-fix-build-for-config_tcp.patch
uml-fix-build-for-config_printk.patch
uml-implement-get_wchan.patch
uml-implement-get_wchan-fix.patch
uml-get-rid-of-asmlinkage.patch
uml-get-rid-of-asmlinkage-checkpatch-fixes.patch
uml-document-new-ubd-flag.patch
uml-further-bugsc-tidying.patch
uml-further-bugsc-tidying-checkpatch-fixes.patch
uml-smp-needs-to-depend-on-broken-for-now.patch
uml-console-driver-cleanups.patch
uml-clonec-tidying.patch
uml-borrow-consth-techniques.patch
uml-delete-some-unused-headers.patch
uml-allow-lflags-on-command-line.patch
uml-tidy-kern_utilh.patch
uml-tidy-pgtableh.patch
uml-reconst-a-parameter.patch
arch-um-remove-duplicate-includes.patch
iget-stop-hostfs-from-using-iget-and-read_inode.patch
iget-stop-hostfs-from-using-iget-and-read_inode-checkpatch-fixes.patch