Fix CVE-2017-1000364 by backporting the patches for rpi3

Backport of patches from upstream for 4.4
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=v4.4.74&id=4b359430674caa2c98d0049a6941f157d2a33741
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=v4.4.74&id=f41512c6acb71c63cf4e3bd50934365ae2a23891
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=v4.4.74&id=1f2284fac2180d7a9442c796d9755e3ce7ab0bd9

Bug-AGL: SPEC-705 SPEC-706

Change-Id: I66fa6e271095c2319791480089a9e6f3392c51d3
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/9875
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Leon Anavi <leon.anavi@konsulko.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi-4.4/0002-Allow-stack-to-grow-up-to-address-space-limit.patch b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi-4.4/0002-Allow-stack-to-grow-up-to-address-space-limit.patch
new file mode 100644
index 000000000..093c2e98a
--- /dev/null
+++ b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux/linux-raspberrypi-4.4/0002-Allow-stack-to-grow-up-to-address-space-limit.patch
@@ -0,0 +1,64 @@
+From a5294b0a0ebd761773d692ce862629af8a7a9eed Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Jan-Simon=20M=C3=B6ller?= <jsmoeller@linuxfoundation.org>
+Date: Wed, 28 Jun 2017 02:46:40 +0200
+Subject: [PATCH 2/3] Allow stack to grow up to address space limit
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+From cd20f002742028366c33b38b3ca613eaee4582c9 Mon Sep 17 00:00:00 2001
+From: Helge Deller <deller@gmx.de>
+Date: Mon, 19 Jun 2017 17:34:05 +0200
+Subject: [PATCH 2/3] Allow stack to grow up to address space limit
+
+commit bd726c90b6b8ce87602208701b208a208e6d5600 upstream.
+
+Fix expand_upwards() on architectures with an upward-growing stack (parisc,
+metag and partly IA-64) to allow the stack to reliably grow exactly up to
+the address space limit given by TASK_SIZE.
+
+Signed-off-by: Helge Deller <deller@gmx.de>
+Acked-by: Hugh Dickins <hughd@google.com>
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ mm/mmap.c | 13 ++++++++-----
+ 1 file changed, 8 insertions(+), 5 deletions(-)
+
+Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
+---
+ mm/mmap.c | 13 ++++++++-----
+ 1 file changed, 8 insertions(+), 5 deletions(-)
+
+diff --git a/mm/mmap.c b/mm/mmap.c
+index 5e043dd..fcf4c88 100644
+--- a/mm/mmap.c
++++ b/mm/mmap.c
+@@ -2172,16 +2172,19 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
+ 	if (!(vma->vm_flags & VM_GROWSUP))
+ 		return -EFAULT;
+ 
+-	/* Guard against wrapping around to address 0. */
++	/* Guard against exceeding limits of the address space. */
+ 	address &= PAGE_MASK;
+-	address += PAGE_SIZE;
+-	if (!address)
++	if (address >= TASK_SIZE)
+ 		return -ENOMEM;
++	address += PAGE_SIZE;
+ 
+ 	/* Enforce stack_guard_gap */
+ 	gap_addr = address + stack_guard_gap;
+-	if (gap_addr < address)
+-		return -ENOMEM;
++
++	/* Guard against overflow */
++	if (gap_addr < address || gap_addr > TASK_SIZE)
++		gap_addr = TASK_SIZE;
++
+ 	next = vma->vm_next;
+ 	if (next && next->vm_start < gap_addr) {
+ 		if (!(next->vm_flags & VM_GROWSUP))
+-- 
+2.1.4
+