Fix CVE-2017-1000364 by backporting the patches from 3.10.107chinook_3.0.5chinook_3.0.4chinook/3.0.5chinook/3.0.43.0.53.0.4chinook

Backport of patches from upstream:
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/patch/?id=1ad9a25dd06fda9bdc27875e1cedb8277accb212
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/patch/?id=28ebf89579a055259280252f68f6c26d986e3ce3
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/patch/?id=0fcba8f954460c56217897bdffbf62060815329a

Bug-AGL: SPEC-706 SPEC-705

Change-Id: I3d8749e3c2e8c6e1f178d8b09fe5b717132408f0
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>

3 files changed, 911 insertions, 0 deletions

diff --git a/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0001-SEC-Backport-mm-larger-stack-guard-gap-between-vmas.patch b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0001-SEC-Backport-mm-larger-stack-guard-gap-between-vmas.patch
new file mode 100644
index 0000000..002e9f1
--- /dev/null
+++ b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0001-SEC-Backport-mm-larger-stack-guard-gap-between-vmas.patch
@@ -0,0 +1,797 @@
+From 0558b5c626426017848d9f3b7af380494c3deece Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Jan-Simon=20M=C3=B6ller?= <jsmoeller@linuxfoundation.org>
+Date: Tue, 27 Jun 2017 22:46:11 +0200
+Subject: [PATCH 1/3] [SEC][Backport] mm: larger stack guard gap, between vmas
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This change backports
+https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/patch/?id=1ad9a25dd06fda9bdc27875e1cedb8277accb212
+
+Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
+---
+ Documentation/kernel-parameters.txt |   7 ++
+ arch/arc/mm/mmap.c                  |   2 +-
+ arch/arm/mm/mmap.c                  |   4 +-
+ arch/frv/mm/elf-fdpic.c             |   2 +-
+ arch/mips/mm/mmap.c                 |   2 +-
+ arch/powerpc/mm/slice.c             |   2 +-
+ arch/sh/mm/mmap.c                   |   4 +-
+ arch/sparc/kernel/sys_sparc_64.c    |   4 +-
+ arch/sparc/mm/hugetlbpage.c         |   2 +-
+ arch/tile/mm/hugetlbpage.c          |   2 +-
+ arch/x86/kernel/sys_x86_64.c        |   4 +-
+ arch/x86/mm/hugetlbpage.c           |   2 +-
+ arch/xtensa/kernel/syscall.c        |   2 +-
+ fs/hugetlbfs/inode.c                |   2 +-
+ fs/proc/task_mmu.c                  |   4 -
+ include/linux/mm.h                  |  53 ++++++------
+ mm/memory.c                         |  49 -----------
+ mm/mmap.c                           | 168 ++++++++++++++++++++----------------
+ 18 files changed, 144 insertions(+), 171 deletions(-)
+
+diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
+index 9859ddf..09924a9 100644
+--- a/Documentation/kernel-parameters.txt
++++ b/Documentation/kernel-parameters.txt
+@@ -2884,6 +2884,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
+ 	spia_pedr=
+ 	spia_peddr=
+ 
++	stack_guard_gap=	[MM]
++			override the default stack gap protection. The value
++			is in page units and it defines how many pages prior
++			to (for stacks growing down) resp. after (for stacks
++			growing up) the main stack are reserved for no other
++			mapping. Default value is 256 pages.
++
+ 	stacktrace	[FTRACE]
+ 			Enabled the stack tracer on boot up.
+ 
+diff --git a/arch/arc/mm/mmap.c b/arch/arc/mm/mmap.c
+index 2e06d56..cf4ae69 100644
+--- a/arch/arc/mm/mmap.c
++++ b/arch/arc/mm/mmap.c
+@@ -64,7 +64,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
+ 
+ 		vma = find_vma(mm, addr);
+ 		if (TASK_SIZE - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 
+diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
+index 5ef506c..984509e 100644
+--- a/arch/arm/mm/mmap.c
++++ b/arch/arm/mm/mmap.c
+@@ -89,7 +89,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
+ 
+ 		vma = find_vma(mm, addr);
+ 		if (TASK_SIZE - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 
+@@ -140,7 +140,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
+ 			addr = PAGE_ALIGN(addr);
+ 		vma = find_vma(mm, addr);
+ 		if (TASK_SIZE - len >= addr &&
+-				(!vma || addr + len <= vma->vm_start))
++				(!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 
+diff --git a/arch/frv/mm/elf-fdpic.c b/arch/frv/mm/elf-fdpic.c
+index 836f147..efa59f1 100644
+--- a/arch/frv/mm/elf-fdpic.c
++++ b/arch/frv/mm/elf-fdpic.c
+@@ -74,7 +74,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
+ 		addr = PAGE_ALIGN(addr);
+ 		vma = find_vma(current->mm, addr);
+ 		if (TASK_SIZE - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			goto success;
+ 	}
+ 
+diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c
+index 7e5fe27..0bb4295 100644
+--- a/arch/mips/mm/mmap.c
++++ b/arch/mips/mm/mmap.c
+@@ -92,7 +92,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
+ 
+ 		vma = find_vma(mm, addr);
+ 		if (TASK_SIZE - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 
+diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
+index 7ce9cf3..887365a 100644
+--- a/arch/powerpc/mm/slice.c
++++ b/arch/powerpc/mm/slice.c
+@@ -103,7 +103,7 @@ static int slice_area_is_free(struct mm_struct *mm, unsigned long addr,
+ 	if ((mm->task_size - len) < addr)
+ 		return 0;
+ 	vma = find_vma(mm, addr);
+-	return (!vma || (addr + len) <= vma->vm_start);
++	return (!vma || (addr + len) <= vm_start_gap(vma));
+ }
+ 
+ static int slice_low_has_vma(struct mm_struct *mm, unsigned long slice)
+diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c
+index 6777177..7df7d59 100644
+--- a/arch/sh/mm/mmap.c
++++ b/arch/sh/mm/mmap.c
+@@ -63,7 +63,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
+ 
+ 		vma = find_vma(mm, addr);
+ 		if (TASK_SIZE - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 
+@@ -113,7 +113,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
+ 
+ 		vma = find_vma(mm, addr);
+ 		if (TASK_SIZE - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 
+diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
+index 2daaaa6..79b981e 100644
+--- a/arch/sparc/kernel/sys_sparc_64.c
++++ b/arch/sparc/kernel/sys_sparc_64.c
+@@ -119,7 +119,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
+ 
+ 		vma = find_vma(mm, addr);
+ 		if (task_size - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 
+@@ -182,7 +182,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
+ 
+ 		vma = find_vma(mm, addr);
+ 		if (task_size - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 
+diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
+index d2b5944..ce49370 100644
+--- a/arch/sparc/mm/hugetlbpage.c
++++ b/arch/sparc/mm/hugetlbpage.c
+@@ -118,7 +118,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
+ 		addr = ALIGN(addr, HPAGE_SIZE);
+ 		vma = find_vma(mm, addr);
+ 		if (task_size - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 	if (mm->get_unmapped_area == arch_get_unmapped_area)
+diff --git a/arch/tile/mm/hugetlbpage.c b/arch/tile/mm/hugetlbpage.c
+index 650ccff..c75eac7 100644
+--- a/arch/tile/mm/hugetlbpage.c
++++ b/arch/tile/mm/hugetlbpage.c
+@@ -297,7 +297,7 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
+ 		addr = ALIGN(addr, huge_page_size(h));
+ 		vma = find_vma(mm, addr);
+ 		if (TASK_SIZE - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 	if (current->mm->get_unmapped_area == arch_get_unmapped_area)
+diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c
+index 30277e2..d050393 100644
+--- a/arch/x86/kernel/sys_x86_64.c
++++ b/arch/x86/kernel/sys_x86_64.c
+@@ -127,7 +127,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
+ 		addr = PAGE_ALIGN(addr);
+ 		vma = find_vma(mm, addr);
+ 		if (end - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 
+@@ -166,7 +166,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
+ 		addr = PAGE_ALIGN(addr);
+ 		vma = find_vma(mm, addr);
+ 		if (TASK_SIZE - len >= addr &&
+-				(!vma || addr + len <= vma->vm_start))
++				(!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 
+diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
+index ae1aa71..6adf3d9 100644
+--- a/arch/x86/mm/hugetlbpage.c
++++ b/arch/x86/mm/hugetlbpage.c
+@@ -341,7 +341,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
+ 		addr = ALIGN(addr, huge_page_size(h));
+ 		vma = find_vma(mm, addr);
+ 		if (TASK_SIZE - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 	if (mm->get_unmapped_area == arch_get_unmapped_area)
+diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c
+index 5d3f7a1..1ff0b92 100644
+--- a/arch/xtensa/kernel/syscall.c
++++ b/arch/xtensa/kernel/syscall.c
+@@ -86,7 +86,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
+ 		/* At this point:  (!vmm || addr < vmm->vm_end). */
+ 		if (TASK_SIZE - len < addr)
+ 			return -ENOMEM;
+-		if (!vmm || addr + len <= vmm->vm_start)
++		if (!vmm || addr + len <= vm_start_gap(vmm))
+ 			return addr;
+ 		addr = vmm->vm_end;
+ 		if (flags & MAP_SHARED)
+diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
+index 4e5f332..db7d89c 100644
+--- a/fs/hugetlbfs/inode.c
++++ b/fs/hugetlbfs/inode.c
+@@ -169,7 +169,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
+ 		addr = ALIGN(addr, huge_page_size(h));
+ 		vma = find_vma(mm, addr);
+ 		if (TASK_SIZE - len >= addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)))
+ 			return addr;
+ 	}
+ 
+diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
+index 65fc60a..a5884ed 100644
+--- a/fs/proc/task_mmu.c
++++ b/fs/proc/task_mmu.c
+@@ -279,11 +279,7 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
+ 
+ 	/* We don't show the stack guard page in /proc/maps */
+ 	start = vma->vm_start;
+-	if (stack_guard_page_start(vma, start))
+-		start += PAGE_SIZE;
+ 	end = vma->vm_end;
+-	if (stack_guard_page_end(vma, end))
+-		end -= PAGE_SIZE;
+ 
+ 	seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
+ 			start,
+diff --git a/include/linux/mm.h b/include/linux/mm.h
+index 263b405..294a6b1 100644
+--- a/include/linux/mm.h
++++ b/include/linux/mm.h
+@@ -1056,34 +1056,6 @@ int set_page_dirty(struct page *page);
+ int set_page_dirty_lock(struct page *page);
+ int clear_page_dirty_for_io(struct page *page);
+ 
+-/* Is the vma a continuation of the stack vma above it? */
+-static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)
+-{
+-	return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
+-}
+-
+-static inline int stack_guard_page_start(struct vm_area_struct *vma,
+-					     unsigned long addr)
+-{
+-	return (vma->vm_flags & VM_GROWSDOWN) &&
+-		(vma->vm_start == addr) &&
+-		!vma_growsdown(vma->vm_prev, addr);
+-}
+-
+-/* Is the vma a continuation of the stack vma below it? */
+-static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr)
+-{
+-	return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP);
+-}
+-
+-static inline int stack_guard_page_end(struct vm_area_struct *vma,
+-					   unsigned long addr)
+-{
+-	return (vma->vm_flags & VM_GROWSUP) &&
+-		(vma->vm_end == addr) &&
+-		!vma_growsup(vma->vm_next, addr);
+-}
+-
+ extern pid_t
+ vm_is_stack(struct task_struct *task, struct vm_area_struct *vma, int in_group);
+ 
+@@ -1609,6 +1581,7 @@ unsigned long ra_submit(struct file_ra_state *ra,
+ 			struct address_space *mapping,
+ 			struct file *filp);
+ 
++extern unsigned long stack_guard_gap;
+ /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
+ extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
+ 
+@@ -1637,6 +1610,30 @@ static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * m
+ 	return vma;
+ }
+ 
++static inline unsigned long vm_start_gap(struct vm_area_struct *vma)
++{
++	unsigned long vm_start = vma->vm_start;
++
++	if (vma->vm_flags & VM_GROWSDOWN) {
++		vm_start -= stack_guard_gap;
++		if (vm_start > vma->vm_start)
++			vm_start = 0;
++	}
++	return vm_start;
++}
++
++static inline unsigned long vm_end_gap(struct vm_area_struct *vma)
++{
++	unsigned long vm_end = vma->vm_end;
++
++	if (vma->vm_flags & VM_GROWSUP) {
++		vm_end += stack_guard_gap;
++		if (vm_end < vma->vm_end)
++			vm_end = -PAGE_SIZE;
++	}
++	return vm_end;
++}
++
+ static inline unsigned long vma_pages(struct vm_area_struct *vma)
+ {
+ 	return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+diff --git a/mm/memory.c b/mm/memory.c
+index 3a3f316..06bbba9 100644
+--- a/mm/memory.c
++++ b/mm/memory.c
+@@ -1654,12 +1654,6 @@ no_page_table:
+ 	return page;
+ }
+ 
+-static inline int stack_guard_page(struct vm_area_struct *vma, unsigned long addr)
+-{
+-	return stack_guard_page_start(vma, addr) ||
+-	       stack_guard_page_end(vma, addr+PAGE_SIZE);
+-}
+-
+ /**
+  * __get_user_pages() - pin user pages in memory
+  * @tsk:	task_struct of target task
+@@ -1827,11 +1821,6 @@ long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
+ 				int ret;
+ 				unsigned int fault_flags = 0;
+ 
+-				/* For mlock, just skip the stack guard page. */
+-				if (foll_flags & FOLL_MLOCK) {
+-					if (stack_guard_page(vma, start))
+-						goto next_page;
+-				}
+ 				if (foll_flags & FOLL_WRITE)
+ 					fault_flags |= FAULT_FLAG_WRITE;
+ 				if (nonblocking)
+@@ -3186,40 +3175,6 @@ out_release:
+ }
+ 
+ /*
+- * This is like a special single-page "expand_{down|up}wards()",
+- * except we must first make sure that 'address{-|+}PAGE_SIZE'
+- * doesn't hit another vma.
+- */
+-static inline int check_stack_guard_page(struct vm_area_struct *vma, unsigned long address)
+-{
+-	address &= PAGE_MASK;
+-	if ((vma->vm_flags & VM_GROWSDOWN) && address == vma->vm_start) {
+-		struct vm_area_struct *prev = vma->vm_prev;
+-
+-		/*
+-		 * Is there a mapping abutting this one below?
+-		 *
+-		 * That's only ok if it's the same stack mapping
+-		 * that has gotten split..
+-		 */
+-		if (prev && prev->vm_end == address)
+-			return prev->vm_flags & VM_GROWSDOWN ? 0 : -ENOMEM;
+-
+-		expand_downwards(vma, address - PAGE_SIZE);
+-	}
+-	if ((vma->vm_flags & VM_GROWSUP) && address + PAGE_SIZE == vma->vm_end) {
+-		struct vm_area_struct *next = vma->vm_next;
+-
+-		/* As VM_GROWSDOWN but s/below/above/ */
+-		if (next && next->vm_start == address + PAGE_SIZE)
+-			return next->vm_flags & VM_GROWSUP ? 0 : -ENOMEM;
+-
+-		expand_upwards(vma, address + PAGE_SIZE);
+-	}
+-	return 0;
+-}
+-
+-/*
+  * We enter with non-exclusive mmap_sem (to exclude vma changes,
+  * but allow concurrent faults), and pte mapped but not yet locked.
+  * We return with mmap_sem still held, but pte unmapped and unlocked.
+@@ -3234,10 +3189,6 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
+ 
+ 	pte_unmap(page_table);
+ 
+-	/* Check if we need to add a guard page to the stack */
+-	if (check_stack_guard_page(vma, address) < 0)
+-		return VM_FAULT_SIGBUS;
+-
+ 	/* Use the zero-page for reads */
+ 	if (!(flags & FAULT_FLAG_WRITE)) {
+ 		entry = pte_mkspecial(pfn_pte(my_zero_pfn(address),
+diff --git a/mm/mmap.c b/mm/mmap.c
+index 8f87b14..cbdac38 100644
+--- a/mm/mmap.c
++++ b/mm/mmap.c
+@@ -263,6 +263,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
+ 	unsigned long rlim, retval;
+ 	unsigned long newbrk, oldbrk;
+ 	struct mm_struct *mm = current->mm;
++	struct vm_area_struct *next;
+ 	unsigned long min_brk;
+ 	bool populate;
+ 
+@@ -308,7 +309,8 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
+ 	}
+ 
+ 	/* Check against existing mmap mappings. */
+-	if (find_vma_intersection(mm, oldbrk, newbrk+PAGE_SIZE))
++	next = find_vma(mm, oldbrk);
++	if (next && newbrk + PAGE_SIZE > vm_start_gap(next))
+ 		goto out;
+ 
+ 	/* Ok, looks good - let it rip. */
+@@ -331,10 +333,22 @@ out:
+ 
+ static long vma_compute_subtree_gap(struct vm_area_struct *vma)
+ {
+-	unsigned long max, subtree_gap;
+-	max = vma->vm_start;
+-	if (vma->vm_prev)
+-		max -= vma->vm_prev->vm_end;
++	unsigned long max, prev_end, subtree_gap;
++
++	/*
++	 * Note: in the rare case of a VM_GROWSDOWN above a VM_GROWSUP, we
++	 * allow two stack_guard_gaps between them here, and when choosing
++	 * an unmapped area; whereas when expanding we only require one.
++	 * That's a little inconsistent, but keeps the code here simpler.
++	 */
++	max = vm_start_gap(vma);
++	if (vma->vm_prev) {
++		prev_end = vm_end_gap(vma->vm_prev);
++		if (max > prev_end)
++			max -= prev_end;
++		else
++			max = 0;
++	}
+ 	if (vma->vm_rb.rb_left) {
+ 		subtree_gap = rb_entry(vma->vm_rb.rb_left,
+ 				struct vm_area_struct, vm_rb)->rb_subtree_gap;
+@@ -418,7 +432,7 @@ void validate_mm(struct mm_struct *mm)
+ 		list_for_each_entry(avc, &vma->anon_vma_chain, same_vma)
+ 			anon_vma_interval_tree_verify(avc);
+ 		vma_unlock_anon_vma(vma);
+-		highest_address = vma->vm_end;
++		highest_address = vm_end_gap(vma);
+ 		vma = vma->vm_next;
+ 		i++;
+ 	}
+@@ -586,7 +600,7 @@ void __vma_link_rb(struct mm_struct *mm, struct vm_area_struct *vma,
+ 	if (vma->vm_next)
+ 		vma_gap_update(vma->vm_next);
+ 	else
+-		mm->highest_vm_end = vma->vm_end;
++		mm->highest_vm_end = vm_end_gap(vma);
+ 
+ 	/*
+ 	 * vma->vm_prev wasn't known when we followed the rbtree to find the
+@@ -835,7 +849,7 @@ again:			remove_next = 1 + (end > next->vm_end);
+ 			vma_gap_update(vma);
+ 		if (end_changed) {
+ 			if (!next)
+-				mm->highest_vm_end = end;
++				mm->highest_vm_end = vm_end_gap(vma);
+ 			else if (!adjust_next)
+ 				vma_gap_update(next);
+ 		}
+@@ -878,7 +892,7 @@ again:			remove_next = 1 + (end > next->vm_end);
+ 		else if (next)
+ 			vma_gap_update(next);
+ 		else
+-			mm->highest_vm_end = end;
++			WARN_ON(mm->highest_vm_end != vm_end_gap(vma));
+ 	}
+ 	if (insert && file)
+ 		uprobe_mmap(insert);
+@@ -1670,7 +1684,7 @@ unsigned long unmapped_area(struct vm_unmapped_area_info *info)
+ 
+ 	while (true) {
+ 		/* Visit left subtree if it looks promising */
+-		gap_end = vma->vm_start;
++		gap_end = vm_start_gap(vma);
+ 		if (gap_end >= low_limit && vma->vm_rb.rb_left) {
+ 			struct vm_area_struct *left =
+ 				rb_entry(vma->vm_rb.rb_left,
+@@ -1681,7 +1695,7 @@ unsigned long unmapped_area(struct vm_unmapped_area_info *info)
+ 			}
+ 		}
+ 
+-		gap_start = vma->vm_prev ? vma->vm_prev->vm_end : 0;
++		gap_start = vma->vm_prev ? vm_end_gap(vma->vm_prev) : 0;
+ check_current:
+ 		/* Check if current node has a suitable gap */
+ 		if (gap_start > high_limit)
+@@ -1708,8 +1722,8 @@ check_current:
+ 			vma = rb_entry(rb_parent(prev),
+ 				       struct vm_area_struct, vm_rb);
+ 			if (prev == vma->vm_rb.rb_left) {
+-				gap_start = vma->vm_prev->vm_end;
+-				gap_end = vma->vm_start;
++				gap_start = vm_end_gap(vma->vm_prev);
++				gap_end = vm_start_gap(vma);
+ 				goto check_current;
+ 			}
+ 		}
+@@ -1773,7 +1787,7 @@ unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info)
+ 
+ 	while (true) {
+ 		/* Visit right subtree if it looks promising */
+-		gap_start = vma->vm_prev ? vma->vm_prev->vm_end : 0;
++		gap_start = vma->vm_prev ? vm_end_gap(vma->vm_prev) : 0;
+ 		if (gap_start <= high_limit && vma->vm_rb.rb_right) {
+ 			struct vm_area_struct *right =
+ 				rb_entry(vma->vm_rb.rb_right,
+@@ -1786,7 +1800,7 @@ unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info)
+ 
+ check_current:
+ 		/* Check if current node has a suitable gap */
+-		gap_end = vma->vm_start;
++		gap_end = vm_start_gap(vma);
+ 		if (gap_end < low_limit)
+ 			return -ENOMEM;
+ 		if (gap_start <= high_limit && gap_end - gap_start >= length)
+@@ -1812,7 +1826,7 @@ check_current:
+ 				       struct vm_area_struct, vm_rb);
+ 			if (prev == vma->vm_rb.rb_right) {
+ 				gap_start = vma->vm_prev ?
+-					vma->vm_prev->vm_end : 0;
++					vm_end_gap(vma->vm_prev) : 0;
+ 				goto check_current;
+ 			}
+ 		}
+@@ -1850,7 +1864,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
+ 		unsigned long len, unsigned long pgoff, unsigned long flags)
+ {
+ 	struct mm_struct *mm = current->mm;
+-	struct vm_area_struct *vma;
++	struct vm_area_struct *vma, *prev;
+ 	struct vm_unmapped_area_info info;
+ 
+ 	if (len > TASK_SIZE - mmap_min_addr)
+@@ -1861,9 +1875,10 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
+ 
+ 	if (addr) {
+ 		addr = PAGE_ALIGN(addr);
+-		vma = find_vma(mm, addr);
++		vma = find_vma_prev(mm, addr, &prev);
+ 		if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
+-		    (!vma || addr + len <= vma->vm_start))
++		    (!vma || addr + len <= vm_start_gap(vma)) &&
++		    (!prev || addr >= vm_end_gap(prev)))
+ 			return addr;
+ 	}
+ 
+@@ -1895,7 +1910,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
+ 			  const unsigned long len, const unsigned long pgoff,
+ 			  const unsigned long flags)
+ {
+-	struct vm_area_struct *vma;
++	struct vm_area_struct *vma, *prev;
+ 	struct mm_struct *mm = current->mm;
+ 	unsigned long addr = addr0;
+ 	struct vm_unmapped_area_info info;
+@@ -1910,9 +1925,10 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
+ 	/* requesting a specific address */
+ 	if (addr) {
+ 		addr = PAGE_ALIGN(addr);
+-		vma = find_vma(mm, addr);
++		vma = find_vma_prev(mm, addr, &prev);
+ 		if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
+-				(!vma || addr + len <= vma->vm_start))
++				(!vma || addr + len <= vm_start_gap(vma)) &&
++				(!prev || addr >= vm_end_gap(prev)))
+ 			return addr;
+ 	}
+ 
+@@ -2104,32 +2120,40 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns
+  */
+ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
+ {
+-	int error;
++	struct vm_area_struct *next;
++	unsigned long gap_addr;
++	int error = 0;
+ 
+ 	if (!(vma->vm_flags & VM_GROWSUP))
+ 		return -EFAULT;
+ 
+-	/*
+-	 * We must make sure the anon_vma is allocated
+-	 * so that the anon_vma locking is not a noop.
+-	 */
++	/* Guard against wrapping around to address 0. */
++	address &= PAGE_MASK;
++	address += PAGE_SIZE;
++	if (!address)
++		return -ENOMEM;
++
++	/* Enforce stack_guard_gap */
++	gap_addr = address + stack_guard_gap;
++	if (gap_addr < address)
++		return -ENOMEM;
++	next = vma->vm_next;
++	if (next && next->vm_start < gap_addr) {
++		if (!(next->vm_flags & VM_GROWSUP))
++			return -ENOMEM;
++		/* Check that both stack segments have the same anon_vma? */
++	}
++
++	/* We must make sure the anon_vma is allocated. */
+ 	if (unlikely(anon_vma_prepare(vma)))
+ 		return -ENOMEM;
+-	vma_lock_anon_vma(vma);
+ 
+ 	/*
+ 	 * vma->vm_start/vm_end cannot change under us because the caller
+ 	 * is required to hold the mmap_sem in read mode.  We need the
+ 	 * anon_vma lock to serialize against concurrent expand_stacks.
+-	 * Also guard against wrapping around to address 0.
+ 	 */
+-	if (address < PAGE_ALIGN(address+4))
+-		address = PAGE_ALIGN(address+4);
+-	else {
+-		vma_unlock_anon_vma(vma);
+-		return -ENOMEM;
+-	}
+-	error = 0;
++	vma_lock_anon_vma(vma);
+ 
+ 	/* Somebody else might have raced and expanded it already */
+ 	if (address > vma->vm_end) {
+@@ -2160,7 +2184,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
+ 				if (vma->vm_next)
+ 					vma_gap_update(vma->vm_next);
+ 				else
+-					vma->vm_mm->highest_vm_end = address;
++					vma->vm_mm->highest_vm_end = vm_end_gap(vma);
+ 				spin_unlock(&vma->vm_mm->page_table_lock);
+ 
+ 				perf_event_mmap(vma);
+@@ -2180,27 +2204,36 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
+ int expand_downwards(struct vm_area_struct *vma,
+ 				   unsigned long address)
+ {
++	struct vm_area_struct *prev;
++	unsigned long gap_addr;
+ 	int error;
+ 
+-	/*
+-	 * We must make sure the anon_vma is allocated
+-	 * so that the anon_vma locking is not a noop.
+-	 */
+-	if (unlikely(anon_vma_prepare(vma)))
+-		return -ENOMEM;
+-
+ 	address &= PAGE_MASK;
+ 	error = security_mmap_addr(address);
+ 	if (error)
+ 		return error;
+ 
+-	vma_lock_anon_vma(vma);
++	/* Enforce stack_guard_gap */
++	gap_addr = address - stack_guard_gap;
++	if (gap_addr > address)
++		return -ENOMEM;
++	prev = vma->vm_prev;
++	if (prev && prev->vm_end > gap_addr) {
++		if (!(prev->vm_flags & VM_GROWSDOWN))
++			return -ENOMEM;
++		/* Check that both stack segments have the same anon_vma? */
++	}
++
++	/* We must make sure the anon_vma is allocated. */
++	if (unlikely(anon_vma_prepare(vma)))
++		return -ENOMEM;
+ 
+ 	/*
+ 	 * vma->vm_start/vm_end cannot change under us because the caller
+ 	 * is required to hold the mmap_sem in read mode.  We need the
+ 	 * anon_vma lock to serialize against concurrent expand_stacks.
+ 	 */
++	vma_lock_anon_vma(vma);
+ 
+ 	/* Somebody else might have raced and expanded it already */
+ 	if (address < vma->vm_start) {
+@@ -2242,28 +2275,25 @@ int expand_downwards(struct vm_area_struct *vma,
+ 	return error;
+ }
+ 
+-/*
+- * Note how expand_stack() refuses to expand the stack all the way to
+- * abut the next virtual mapping, *unless* that mapping itself is also
+- * a stack mapping. We want to leave room for a guard page, after all
+- * (the guard page itself is not added here, that is done by the
+- * actual page faulting logic)
+- *
+- * This matches the behavior of the guard page logic (see mm/memory.c:
+- * check_stack_guard_page()), which only allows the guard page to be
+- * removed under these circumstances.
+- */
++/* enforced gap between the expanding stack and other mappings. */
++unsigned long stack_guard_gap = 256UL<<PAGE_SHIFT;
++
++static int __init cmdline_parse_stack_guard_gap(char *p)
++{
++	unsigned long val;
++	char *endptr;
++
++	val = simple_strtoul(p, &endptr, 10);
++	if (!*endptr)
++		stack_guard_gap = val << PAGE_SHIFT;
++
++	return 0;
++}
++__setup("stack_guard_gap=", cmdline_parse_stack_guard_gap);
++
+ #ifdef CONFIG_STACK_GROWSUP
+ int expand_stack(struct vm_area_struct *vma, unsigned long address)
+ {
+-	struct vm_area_struct *next;
+-
+-	address &= PAGE_MASK;
+-	next = vma->vm_next;
+-	if (next && next->vm_start == address + PAGE_SIZE) {
+-		if (!(next->vm_flags & VM_GROWSUP))
+-			return -ENOMEM;
+-	}
+ 	return expand_upwards(vma, address);
+ }
+ 
+@@ -2285,14 +2315,6 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
+ #else
+ int expand_stack(struct vm_area_struct *vma, unsigned long address)
+ {
+-	struct vm_area_struct *prev;
+-
+-	address &= PAGE_MASK;
+-	prev = vma->vm_prev;
+-	if (prev && prev->vm_end == address) {
+-		if (!(prev->vm_flags & VM_GROWSDOWN))
+-			return -ENOMEM;
+-	}
+ 	return expand_downwards(vma, address);
+ }
+ 
+@@ -2389,7 +2411,7 @@ detach_vmas_to_be_unmapped(struct mm_struct *mm, struct vm_area_struct *vma,
+ 		vma->vm_prev = prev;
+ 		vma_gap_update(vma);
+ 	} else
+-		mm->highest_vm_end = prev ? prev->vm_end : 0;
++		mm->highest_vm_end = prev ? vm_end_gap(prev) : 0;
+ 	tail_vma->vm_next = NULL;
+ 	if (mm->unmap_area == arch_unmap_area)
+ 		addr = prev ? prev->vm_end : mm->mmap_base;
+-- 
+2.1.4
+
diff --git a/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0002-SEC-Backport-mm-fix-new-crash-in-unmapped_area_topdo.patch b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0002-SEC-Backport-mm-fix-new-crash-in-unmapped_area_topdo.patch
new file mode 100644
index 0000000..8ad1dc3
--- /dev/null
+++ b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0002-SEC-Backport-mm-fix-new-crash-in-unmapped_area_topdo.patch
@@ -0,0 +1,58 @@
+From 880bd724f76f26f712968fdf4917174b16540a4d Mon Sep 17 00:00:00 2001
+From: Hugh Dickins <hughd@google.com>
+Date: Tue, 20 Jun 2017 02:10:44 -0700
+Subject: [PATCH 2/3] [SEC][Backport] mm: fix new crash in
+ unmapped_area_topdown()
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+commit f4cb767d76cf7ee72f97dd76f6cfa6c76a5edc89 upstream.
+
+Trinity gets kernel BUG at mm/mmap.c:1963! in about 3 minutes of
+mmap testing.  That's the VM_BUG_ON(gap_end < gap_start) at the
+end of unmapped_area_topdown().  Linus points out how MAP_FIXED
+(which does not have to respect our stack guard gap intentions)
+could result in gap_end below gap_start there.  Fix that, and
+the similar case in its alternative, unmapped_area().
+
+Cc: stable@vger.kernel.org
+Fixes: 1be7107fbe18 ("mm: larger stack guard gap, between vmas")
+Reported-by: Dave Jones <davej@codemonkey.org.uk>
+Debugged-by: Linus Torvalds <torvalds@linux-foundation.org>
+Signed-off-by: Hugh Dickins <hughd@google.com>
+Acked-by: Michal Hocko <mhocko@suse.com>
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+Signed-off-by: Willy Tarreau <w@1wt.eu>
+Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
+---
+ mm/mmap.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/mm/mmap.c b/mm/mmap.c
+index cbdac38..4a113e3 100644
+--- a/mm/mmap.c
++++ b/mm/mmap.c
+@@ -1700,7 +1700,8 @@ check_current:
+ 		/* Check if current node has a suitable gap */
+ 		if (gap_start > high_limit)
+ 			return -ENOMEM;
+-		if (gap_end >= low_limit && gap_end - gap_start >= length)
++		if (gap_end >= low_limit &&
++		    gap_end > gap_start && gap_end - gap_start >= length)
+ 			goto found;
+ 
+ 		/* Visit right subtree if it looks promising */
+@@ -1803,7 +1804,8 @@ check_current:
+ 		gap_end = vm_start_gap(vma);
+ 		if (gap_end < low_limit)
+ 			return -ENOMEM;
+-		if (gap_start <= high_limit && gap_end - gap_start >= length)
++		if (gap_start <= high_limit &&
++		    gap_end > gap_start && gap_end - gap_start >= length)
+ 			goto found;
+ 
+ 		/* Visit left subtree if it looks promising */
+-- 
+2.1.4
+
diff --git a/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0003-SEC-Backport-Allow-stack-to-grow-up-to-address-space.patch b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0003-SEC-Backport-Allow-stack-to-grow-up-to-address-space.patch
new file mode 100644
index 0000000..588cd8c
--- /dev/null
+++ b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0003-SEC-Backport-Allow-stack-to-grow-up-to-address-space.patch
@@ -0,0 +1,56 @@
+From 68785afca6b04411df86323dca372f136e225639 Mon Sep 17 00:00:00 2001
+From: Helge Deller <deller@gmx.de>
+Date: Mon, 19 Jun 2017 17:34:05 +0200
+Subject: [PATCH 3/3] [SEC][Backport] Allow stack to grow up to address space
+ limit
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+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: Willy Tarreau <w@1wt.eu>
+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 4a113e3..16aeffc 100644
+--- a/mm/mmap.c
++++ b/mm/mmap.c
+@@ -2129,16 +2129,19 @@ 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
+