71 lines
2.5 KiB
Diff
71 lines
2.5 KiB
Diff
From 3bc42412073e1c559266e2b07bc1fbce154d92dc Mon Sep 17 00:00:00 2001
|
|
From: Dave Hansen <dave.hansen@linux.intel.com>
|
|
Date: Mon, 4 Dec 2017 15:07:40 +0100
|
|
Subject: [PATCH 195/231] x86/mm/pti: Populate user PGD
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
CVE-2017-5754
|
|
|
|
In clone_pgd_range() copy the init user PGDs which cover the kernel half of
|
|
the address space, so a process has all the required kernel mappings
|
|
visible.
|
|
|
|
[ tglx: Split out from the big kaiser dump and folded Andys simplification ]
|
|
|
|
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
|
|
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
|
|
Reviewed-by: Borislav Petkov <bp@suse.de>
|
|
Cc: Andy Lutomirski <luto@kernel.org>
|
|
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
|
|
Cc: Borislav Petkov <bp@alien8.de>
|
|
Cc: Brian Gerst <brgerst@gmail.com>
|
|
Cc: David Laight <David.Laight@aculab.com>
|
|
Cc: Denys Vlasenko <dvlasenk@redhat.com>
|
|
Cc: Eduardo Valentin <eduval@amazon.com>
|
|
Cc: Greg KH <gregkh@linuxfoundation.org>
|
|
Cc: H. Peter Anvin <hpa@zytor.com>
|
|
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
|
|
Cc: Juergen Gross <jgross@suse.com>
|
|
Cc: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Cc: Peter Zijlstra <peterz@infradead.org>
|
|
Cc: Will Deacon <will.deacon@arm.com>
|
|
Cc: aliguori@amazon.com
|
|
Cc: daniel.gruss@iaik.tugraz.at
|
|
Cc: hughd@google.com
|
|
Cc: keescook@google.com
|
|
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
|
(cherry picked from commit fc2fbc8512ed08d1de7720936fd7d2e4ce02c3a2)
|
|
Signed-off-by: Andy Whitcroft <apw@canonical.com>
|
|
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
|
|
(cherry picked from commit 26c08c52162e1079cbb3e9ce8e1346a100ea7ccc)
|
|
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
|
|
---
|
|
arch/x86/include/asm/pgtable.h | 9 ++++++++-
|
|
1 file changed, 8 insertions(+), 1 deletion(-)
|
|
|
|
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
|
|
index 3ef8415b2358..25604b8a251a 100644
|
|
--- a/arch/x86/include/asm/pgtable.h
|
|
+++ b/arch/x86/include/asm/pgtable.h
|
|
@@ -1104,7 +1104,14 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
|
|
*/
|
|
static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
|
|
{
|
|
- memcpy(dst, src, count * sizeof(pgd_t));
|
|
+ memcpy(dst, src, count * sizeof(pgd_t));
|
|
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
|
|
+ if (!static_cpu_has(X86_FEATURE_PTI))
|
|
+ return;
|
|
+ /* Clone the user space pgd as well */
|
|
+ memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
|
|
+ count * sizeof(pgd_t));
|
|
+#endif
|
|
}
|
|
|
|
#define PTE_SHIFT ilog2(PTRS_PER_PTE)
|
|
--
|
|
2.14.2
|
|
|