[RFC][PATCH 10/10] x86/pti: clear _PAGE_GLOBAL for kernel image

Dave Hansen
2018-02-22T20:37:18Z

From: Dave Hansen <dave.hansen@linux.intel.com>

The kernel page tables are inherited from head_64.S which rudely marks
them as _PAGE_GLOBAL. For PTI, we have been relying on the grace of
$DEITY and some insane behavior in pageattr.c. Now we do it properly.

First, stop filtering out "unsupported" bits from being cleared in the
pageattr code. It's fine to filter out *setting* these bits but it
is insane to keep us from clearing them.

Then, *explicitly* go clear _PAGE_GLOBAL from the kernel identity map.
Do not rely on pageattr to do it magically.

After this patch, we can see that "GLB" shows up in each copy of the
page tables, that we have the same number of global entries in each
and that they are the *same* entries.

# grep -c GLB /sys/kernel/debug/page_tables/*
/sys/kernel/debug/page_tables/current_kernel:11
/sys/kernel/debug/page_tables/current_user:11
/sys/kernel/debug/page_tables/kernel:11

# for f in `ls /sys/kernel/debug/page_tables/`; do grep GLB /sys/kernel/debug/page_tables/$f > $f.GLB; done
# md5sum *.GLB
9caae8ad6a1fb53aca2407ec037f612d current_kernel.GLB
9caae8ad6a1fb53aca2407ec037f612d current_user.GLB
9caae8ad6a1fb53aca2407ec037f612d kernel.GLB

A quick visual audit also shows that all the entries make sense.
0xfffffe0000000000 is the cpu_entry_area and 0xffffffff81c00000
is the entry/exit text:

# grep -c GLB /sys/kernel/debug/page_tables/current_user
0xfffffe0000000000-0xfffffe0000002000 8K ro GLB NX pte
0xfffffe0000002000-0xfffffe0000003000 4K RW GLB NX pte
0xfffffe0000003000-0xfffffe0000006000 12K ro GLB NX pte
0xfffffe0000006000-0xfffffe0000007000 4K ro GLB x pte
0xfffffe0000007000-0xfffffe000000d000 24K RW GLB NX pte
0xfffffe000002d000-0xfffffe000002e000 4K ro GLB NX pte
0xfffffe000002e000-0xfffffe000002f000 4K RW GLB NX pte
0xfffffe000002f000-0xfffffe0000032000 12K ro GLB NX pte
0xfffffe0000032000-0xfffffe0000033000 4K ro GLB x pte
0xfffffe0000033000-0xfffffe0000039000 24K RW GLB NX pte
0xffffffff81c00000-0xffffffff81e00000 2M ro PSE GLB x pmd

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Kees Cook <keescook@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: x86@kernel.org
Cc: Nadav Amit <namit@vmware.com>
---

b/arch/x86/mm/init.c | 8 +-------
b/arch/x86/mm/pageattr.c | 12 +++++++++---
b/arch/x86/mm/pti.c | 26 ++++++++++++++++++++++++++
3 files changed, 36 insertions(+), 10 deletions(-)

diff -puN arch/x86/mm/init.c~clear-global-for-pti arch/x86/mm/init.c
--- a/arch/x86/mm/init.c~clear-global-for-pti 2018-02-22 12:36:22.627036544 -0800
+++ b/arch/x86/mm/init.c 2018-02-22 12:36:22.634036544 -0800
@@ -161,12 +161,6 @@ struct map_range {

static int page_size_mask;

-static void enable_global_pages(void)
-{
- if (!static_cpu_has(X86_FEATURE_PTI))
- __supported_pte_mask |= _PAGE_GLOBAL;
-}
-
static void __init probe_page_size_mask(void)
{
/*
@@ -187,7 +181,7 @@ static void __init probe_page_size_mask(
__supported_pte_mask &= ~_PAGE_GLOBAL;
if (boot_cpu_has(X86_FEATURE_PGE)) {
cr4_set_bits_and_update_boot(X86_CR4_PGE);
- enable_global_pages();
+ __supported_pte_mask |= _PAGE_GLOBAL;
}

/* By the default is everything supported: */
diff -puN arch/x86/mm/pageattr.c~clear-global-for-pti arch/x86/mm/pageattr.c
--- a/arch/x86/mm/pageattr.c~clear-global-for-pti 2018-02-22 12:36:22.629036544 -0800
+++ b/arch/x86/mm/pageattr.c 2018-02-22 12:36:22.635036544 -0800
@@ -1411,11 +1411,11 @@ static int change_page_attr_set_clr(unsi
memset(&cpa, 0, sizeof(cpa));

/*
- * Check, if we are requested to change a not supported
- * feature:
+ * Check, if we are requested to set a not supported
+ * feature. Clearing non-supported features is OK.
*/
mask_set = canon_pgprot(mask_set);
- mask_clr = canon_pgprot(mask_clr);
+
if (!pgprot_val(mask_set) && !pgprot_val(mask_clr) && !force_split)
return 0;

@@ -1758,6 +1758,12 @@ int set_memory_4k(unsigned long addr, in
__pgprot(0), 1, 0, NULL);
}

+int set_memory_nonglobal(unsigned long addr, int numpages)
+{
+ return change_page_attr_clear(&addr, numpages,
+ __pgprot(_PAGE_GLOBAL), 0);
+}
+
static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
{
struct cpa_data cpa;
diff -puN arch/x86/mm/pti.c~clear-global-for-pti arch/x86/mm/pti.c
--- a/arch/x86/mm/pti.c~clear-global-for-pti 2018-02-22 12:36:22.631036544 -0800
+++ b/arch/x86/mm/pti.c 2018-02-22 12:36:22.635036544 -0800
@@ -359,6 +359,28 @@ static void __init pti_clone_entry_text(
}

/*
+ * This is the only user for it and it is not arch-generic like
+ * the other set_memory.h functions. Just extern it.
+ */
+extern int set_memory_nonglobal(unsigned long addr, int numpages);
+void pti_set_kernel_image_nonglobal(void)
+{
+ /*
+ * The identity map is created with PMDs, regardless of the
+ * actual length of the kernel. We need to clear
+ * _PAGE_GLOBAL up to a PMD boundary, not just to the end
+ * of the image.
+ */
+ unsigned long start = PFN_ALIGN(_text);
+ unsigned long end = ALIGN((unsigned long)_end, PMD_PAGE_SIZE);
+
+ pr_debug("x86/pti: Set kernel image: %lx - %lx non-global\n",
+ start, end);
+
+ set_memory_nonglobal(start, (end - start) >> PAGE_SHIFT);
+}
+
+/*
* Initialize kernel page table isolation
*/
void __init pti_init(void)
@@ -369,6 +391,10 @@ void __init pti_init(void)
pr_info("enabled\n");

pti_clone_user_shared();
+
+ /* Undo all global bits from the init pagetables in head_64.S: */
+ pti_set_kernel_image_nonglobal();
+ /* Replace some of the global bits just for shared entry text: */
pti_clone_entry_text();
pti_setup_espfix64();
pti_setup_vsyscall();
_