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Date:	Mon, 26 Oct 2009 11:11:43 +0100
From:	Jiri Slaby <>
Cc:,,,, Jiri Slaby <>,
	Vivek Goyal <>,
	"Eric W. Biederman" <>,
	Simon Horman <>,
	Paul Mundt <>, Ingo Molnar <>
Subject: [PATCH v2 1/1] crash_dump: fix non-pae kdump kernel memory accesses

Non-PAE 32-bit dump kernels may wrap an address around 4G and
poke unwanted space. ptes there are 32-bit long, and since
pfn << PAGE_SIZE may exceed this limit, high pfn bits are cropped
and wrong address mapped by kmap_atomic_pfn in copy_oldmem_page.

Don't allow this behavior in non-PAE kdump kernels by checking
pfns passed into copy_oldmem_page. In the case of failure,
userspace process gets EFAULT.

- fix comments
- move ifdefs inside the function

Signed-off-by: Jiri Slaby <>
Cc: Vivek Goyal <>
Cc: "Eric W. Biederman" <>
Cc: Simon Horman <>
Cc: Paul Mundt <>
Cc: Ingo Molnar <>
 arch/x86/kernel/crash_dump_32.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/crash_dump_32.c b/arch/x86/kernel/crash_dump_32.c
index f7cdb3b..cd97ce1 100644
--- a/arch/x86/kernel/crash_dump_32.c
+++ b/arch/x86/kernel/crash_dump_32.c
@@ -16,6 +16,22 @@ static void *kdump_buf_page;
 /* Stores the physical address of elf header of crash image. */
 unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
+static inline bool is_crashed_pfn_valid(unsigned long pfn)
+#ifndef CONFIG_X86_PAE
+	/*
+	 * non-PAE kdump kernel executed from a PAE one will crop high pte
+	 * bits and poke unwanted space counting again from address 0, we
+	 * don't want that. pte must fit into unsigned long. In fact the
+	 * test checks high 12 bits for being zero (pfn will be shifted left
+	 * by PAGE_SHIFT).
+	 */
+	return pte_pfn(pfn_pte(pfn, __pgprot(0))) == pfn;
+	return true;
  * copy_oldmem_page - copy one page from "oldmem"
  * @pfn: page frame number to be copied
@@ -41,6 +57,9 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 	if (!csize)
 		return 0;
+	if (!is_crashed_pfn_valid(pfn))
+		return -EFAULT;
 	vaddr = kmap_atomic_pfn(pfn, KM_PTE0);
 	if (!userbuf) {

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