[linux] 01/01: Update to 3.2.90

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Mon Jul 3 16:37:46 UTC 2017


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benh pushed a commit to branch wheezy-security
in repository linux.

commit d0a6ec66efc273b2fac8af72e89ce4de2fa91ff0
Author: Ben Hutchings <ben at decadent.org.uk>
Date:   Mon Jul 3 17:34:26 2017 +0100

    Update to 3.2.90
---
 debian/changelog                                   |   12 +
 ...row-the-stack-vma-just-because-of-an-over.patch |   74 -
 .../mm-larger-stack-guard-gap-between-vmas.patch   | 1512 --------------------
 debian/patches/series                              |    2 -
 4 files changed, 12 insertions(+), 1588 deletions(-)

diff --git a/debian/changelog b/debian/changelog
index 67d0639..749bd11 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,15 @@
+linux (3.2.90-1) UNRELEASED; urgency=medium
+
+  * New upstream stable update:
+    https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.90
+    - Allow stack to grow up to address space limit
+    - rxrpc: Fix several cases where a padded len isn't checked in ticket decode
+      (CVE-2017-7482)
+    - mm: simplify find_vma_prev()
+    - mm: fix find_vma_prev
+
+ -- Ben Hutchings <ben at decadent.org.uk>  Mon, 03 Jul 2017 17:17:55 +0100
+
 linux (3.2.89-2) wheezy-security; urgency=high
 
   * Revert previous fixes for CVE-2017-1000364 (Closes: #865303)
diff --git a/debian/patches/bugfix/all/mm-do-not-grow-the-stack-vma-just-because-of-an-over.patch b/debian/patches/bugfix/all/mm-do-not-grow-the-stack-vma-just-because-of-an-over.patch
deleted file mode 100644
index 44990aa..0000000
--- a/debian/patches/bugfix/all/mm-do-not-grow-the-stack-vma-just-because-of-an-over.patch
+++ /dev/null
@@ -1,74 +0,0 @@
-From: Linus Torvalds <torvalds at linux-foundation.org>
-Date: Wed, 27 Feb 2013 08:36:04 -0800
-Subject: mm: do not grow the stack vma just because of an overrun on preceding vma
-Origin: https://git.kernel.org/linus/09884964335e85e897876d17783c2ad33cf8a2e0
-
-The stack vma is designed to grow automatically (marked with VM_GROWSUP
-or VM_GROWSDOWN depending on architecture) when an access is made beyond
-the existing boundary.  However, particularly if you have not limited
-your stack at all ("ulimit -s unlimited"), this can cause the stack to
-grow even if the access was really just one past *another* segment.
-
-And that's wrong, especially since we first grow the segment, but then
-immediately later enforce the stack guard page on the last page of the
-segment.  So _despite_ first growing the stack segment as a result of
-the access, the kernel will then make the access cause a SIGSEGV anyway!
-
-So do the same logic as the guard page check does, and consider an
-access to within one page of the next segment to be a bad access, rather
-than growing the stack to abut the next segment.
-
-Reported-and-tested-by: Heiko Carstens <heiko.carstens at de.ibm.com>
-Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
----
- mm/mmap.c | 27 +++++++++++++++++++++++++++
- 1 file changed, 27 insertions(+)
-
-diff --git a/mm/mmap.c b/mm/mmap.c
-index 94f4e3444ae5..e949a2026a72 100644
---- a/mm/mmap.c
-+++ b/mm/mmap.c
-@@ -1802,9 +1802,28 @@ 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.
-+ */
- #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);
- }
- 
-@@ -1827,6 +1846,14 @@ 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);
- }
- 
diff --git a/debian/patches/bugfix/all/mm-larger-stack-guard-gap-between-vmas.patch b/debian/patches/bugfix/all/mm-larger-stack-guard-gap-between-vmas.patch
deleted file mode 100644
index f663826..0000000
--- a/debian/patches/bugfix/all/mm-larger-stack-guard-gap-between-vmas.patch
+++ /dev/null
@@ -1,1512 +0,0 @@
-From: Hugh Dickins <hughd at google.com>
-Date: Mon, 19 Jun 2017 20:32:47 +0200
-Subject: mm: larger stack guard gap, between vmas
-Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2017-1000364
-
-commit 1be7107fbe18eed3e319a6c3e83c78254b693acb upstream.
-
-Stack guard page is a useful feature to reduce a risk of stack smashing
-into a different mapping. We have been using a single page gap which
-is sufficient to prevent having stack adjacent to a different mapping.
-But this seems to be insufficient in the light of the stack usage in
-userspace. E.g. glibc uses as large as 64kB alloca() in many commonly
-used functions. Others use constructs liks gid_t buffer[NGROUPS_MAX]
-which is 256kB or stack strings with MAX_ARG_STRLEN.
-
-This will become especially dangerous for suid binaries and the default
-no limit for the stack size limit because those applications can be
-tricked to consume a large portion of the stack and a single glibc call
-could jump over the guard page. These attacks are not theoretical,
-unfortunatelly.
-
-Make those attacks less probable by increasing the stack guard gap
-to 1MB (on systems with 4k pages; but make it depend on the page size
-because systems with larger base pages might cap stack allocations in
-the PAGE_SIZE units) which should cover larger alloca() and VLA stack
-allocations. It is obviously not a full fix because the problem is
-somehow inherent, but it should reduce attack space a lot.
-
-One could argue that the gap size should be configurable from userspace,
-but that can be done later when somebody finds that the new 1MB is wrong
-for some special case applications.  For now, add a kernel command line
-option (stack_guard_gap) to specify the stack gap size (in page units).
-
-Implementation wise, first delete all the old code for stack guard page:
-because although we could get away with accounting one extra page in a
-stack vma, accounting a larger gap can break userspace - case in point,
-a program run with "ulimit -S -v 20000" failed when the 1MB gap was
-counted for RLIMIT_AS; similar problems could come with RLIMIT_MLOCK
-and strict non-overcommit mode.
-
-Instead of keeping gap inside the stack vma, maintain the stack guard
-gap as a gap between vmas: using vm_start_gap() in place of vm_start
-(or vm_end_gap() in place of vm_end if VM_GROWSUP) in just those few
-places which need to respect the gap - mainly arch_get_unmapped_area(),
-and and the vma tree's subtree_gap support for that.
-
-Original-patch-by: Oleg Nesterov <oleg at redhat.com>
-Original-patch-by: Michal Hocko <mhocko at suse.com>
-Signed-off-by: Hugh Dickins <hughd at google.com>
----
-And here's my attempt at a backport to 3.2.89, at last.
-I know it builds and boots and runs on x86 64 and 32,
-but that's about all that I've tried.
-
-If you diff against yours (I preferred not to send that diff,
-because of the couple of rejects in yours against 3.2.89),
-you'll find most of the difference is just noise from where
-I used a variable, but you had not yet done so in yours.
-
-But there are those three missing files, and there are a few
-places where I have a little "if (prev) {" block at the head of
-the loop after find_vma_prev(): I think those loops start off
-wrongly without that.
-
-I notice now that you don't use find_vma_prev() in your generic
-(mm/mmap.c) arch_get_unmapped_area() and _topdown(): and now
-that I reflect on it, I think you're perfectly correct to keep
-those simple (especially given the inefficient implementation
-of find_vma_prev() in 3.2 - only later was it changed to make
-use of vm_prev), since both ia64 and parisc provide their own
-arch_get_unmapped_area() in this release, and neither use the
-_topdown().
-
-Whereas I spent much too much time on adapting those generics
-to vm_end_gap(), and pretty much gave up on the _topdown() -
-it grieved me to end up calling find_vma_prev() each time
-around the loop (where before it called find_vma() each time
-around the loop), there is definitely better use to be made
-of vm_prev there, but too hard to get right as I grew tired.
-
-So please at least take a look through the diff from yours, I
-think you'll find a few things to bring in, but a lot to ignore.
-
-Hugh
-
-[bwh: Fix more instances of vma->vm_start in sparc64 impl. of
- arch_get_unmapped_area_topdown() and generic impl. of
- hugetlb_get_unmapped_area()]
-
---- a/Documentation/kernel-parameters.txt
-+++ b/Documentation/kernel-parameters.txt
-@@ -2463,6 +2463,13 @@ bytes respectively. Such letter suffixes
- 	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.
- 
---- a/arch/alpha/kernel/osf_sys.c
-+++ b/arch/alpha/kernel/osf_sys.c
-@@ -1147,7 +1147,7 @@ arch_get_unmapped_area_1(unsigned long a
- 		/* At this point:  (!vma || addr < vma->vm_end). */
- 		if (limit - len < addr)
- 			return -ENOMEM;
--		if (!vma || addr + len <= vma->vm_start)
-+		if (!vma || addr + len <= vm_start_vma(vma))
- 			return addr;
- 		addr = vma->vm_end;
- 		vma = vma->vm_next;
---- a/arch/arm/mm/mmap.c
-+++ b/arch/arm/mm/mmap.c
-@@ -69,7 +69,7 @@ arch_get_unmapped_area(struct file *filp
- {
- 	struct mm_struct *mm = current->mm;
- 	struct vm_area_struct *vma;
--	unsigned long start_addr;
-+	unsigned long start_addr, vm_start;
- 	int do_align = 0;
- 	int aliasing = cache_is_vipt_aliasing();
- 
-@@ -101,7 +101,7 @@ arch_get_unmapped_area(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;
- 	}
- 	if (len > mm->cached_hole_size) {
-@@ -131,15 +131,17 @@ full_search:
- 			}
- 			return -ENOMEM;
- 		}
--		if (!vma || addr + len <= vma->vm_start) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (!vma || addr + len <= vm_start) {
- 			/*
- 			 * Remember the place where we stopped the search:
- 			 */
- 			mm->free_area_cache = addr + len;
- 			return addr;
- 		}
--		if (addr + mm->cached_hole_size < vma->vm_start)
--		        mm->cached_hole_size = vma->vm_start - addr;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 		addr = vma->vm_end;
- 		if (do_align)
- 			addr = COLOUR_ALIGN(addr, pgoff);
---- a/arch/frv/mm/elf-fdpic.c
-+++ b/arch/frv/mm/elf-fdpic.c
-@@ -74,7 +74,7 @@ unsigned long arch_get_unmapped_area(str
- 		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;
- 	}
- 
-@@ -89,7 +89,7 @@ unsigned long arch_get_unmapped_area(str
- 			for (; vma; vma = vma->vm_next) {
- 				if (addr > limit)
- 					break;
--				if (addr + len <= vma->vm_start)
-+				if (addr + len <= vm_start_gap(vma))
- 					goto success;
- 				addr = vma->vm_end;
- 			}
-@@ -104,7 +104,7 @@ unsigned long arch_get_unmapped_area(str
- 		for (; vma; vma = vma->vm_next) {
- 			if (addr > limit)
- 				break;
--			if (addr + len <= vma->vm_start)
-+			if (addr + len <= vm_start_gap(vma))
- 				goto success;
- 			addr = vma->vm_end;
- 		}
---- a/arch/ia64/kernel/sys_ia64.c
-+++ b/arch/ia64/kernel/sys_ia64.c
-@@ -27,7 +27,8 @@ arch_get_unmapped_area (struct file *fil
- 	long map_shared = (flags & MAP_SHARED);
- 	unsigned long start_addr, align_mask = PAGE_SIZE - 1;
- 	struct mm_struct *mm = current->mm;
--	struct vm_area_struct *vma;
-+	struct vm_area_struct *vma, *prev;
-+	unsigned long prev_end;
- 
- 	if (len > RGN_MAP_LIMIT)
- 		return -ENOMEM;
-@@ -58,7 +59,17 @@ arch_get_unmapped_area (struct file *fil
-   full_search:
- 	start_addr = addr = (addr + align_mask) & ~align_mask;
- 
--	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
-+	for (vma = find_vma_prev(mm, addr, &prev); ; prev = vma,
-+						vma = vma->vm_next) {
-+		if (prev) {
-+			prev_end = vm_end_gap(prev);
-+			if (addr < prev_end) {
-+				addr = (prev_end + align_mask) & ~align_mask;
-+				/* If vma already violates gap, forget it */
-+				if (vma && addr > vma->vm_start)
-+					addr = vma->vm_start;
-+			}
-+		}
- 		/* At this point:  (!vma || addr < vma->vm_end). */
- 		if (TASK_SIZE - len < addr || RGN_MAP_LIMIT - len < REGION_OFFSET(addr)) {
- 			if (start_addr != TASK_UNMAPPED_BASE) {
-@@ -68,12 +79,11 @@ arch_get_unmapped_area (struct file *fil
- 			}
- 			return -ENOMEM;
- 		}
--		if (!vma || addr + len <= vma->vm_start) {
-+		if (!vma || addr + len <= vm_start_gap(vma)) {
- 			/* Remember the address where we stopped this search:  */
- 			mm->free_area_cache = addr + len;
- 			return addr;
- 		}
--		addr = (vma->vm_end + align_mask) & ~align_mask;
- 	}
- }
- 
---- a/arch/ia64/mm/hugetlbpage.c
-+++ b/arch/ia64/mm/hugetlbpage.c
-@@ -171,9 +171,9 @@ unsigned long hugetlb_get_unmapped_area(
- 		/* At this point:  (!vmm || addr < vmm->vm_end). */
- 		if (REGION_OFFSET(addr) + len > RGN_MAP_LIMIT)
- 			return -ENOMEM;
--		if (!vmm || (addr + len) <= vmm->vm_start)
-+		if (!vmm || (addr + len) <= vm_start_gap(vmm))
- 			return addr;
--		addr = ALIGN(vmm->vm_end, HPAGE_SIZE);
-+		addr = ALIGN(vm_end_gap(vmm), HPAGE_SIZE);
- 	}
- }
- 
---- a/arch/mips/mm/mmap.c
-+++ b/arch/mips/mm/mmap.c
-@@ -70,6 +70,7 @@ static unsigned long arch_get_unmapped_a
- 	struct mm_struct *mm = current->mm;
- 	struct vm_area_struct *vma;
- 	unsigned long addr = addr0;
-+	unsigned long vm_start;
- 	int do_color_align;
- 
- 	if (unlikely(len > TASK_SIZE))
-@@ -103,7 +104,7 @@ static unsigned long arch_get_unmapped_a
- 
- 		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;
- 	}
- 
-@@ -118,7 +119,7 @@ static unsigned long arch_get_unmapped_a
- 			/* At this point:  (!vma || addr < vma->vm_end). */
- 			if (TASK_SIZE - len < addr)
- 				return -ENOMEM;
--			if (!vma || addr + len <= vma->vm_start)
-+			if (!vma || addr + len <= vm_start_gap(vma))
- 				return addr;
- 			addr = vma->vm_end;
- 			if (do_color_align)
-@@ -145,7 +146,7 @@ static unsigned long arch_get_unmapped_a
- 		/* make sure it can fit in the remaining address space */
- 		if (likely(addr > len)) {
- 			vma = find_vma(mm, addr - len);
--			if (!vma || addr <= vma->vm_start) {
-+			if (!vma || addr <= vm_start_gap(vma)) {
- 				/* cache the address as a hint for next time */
- 				return mm->free_area_cache = addr - len;
- 			}
-@@ -165,20 +166,22 @@ static unsigned long arch_get_unmapped_a
- 			 * return with success:
- 			 */
- 			vma = find_vma(mm, addr);
--			if (likely(!vma || addr + len <= vma->vm_start)) {
-+			if (vma)
-+				vm_start = vm_start_gap(vma);
-+			if (likely(!vma || addr + len <= vm_start)) {
- 				/* cache the address as a hint for next time */
- 				return mm->free_area_cache = addr;
- 			}
- 
- 			/* remember the largest hole we saw so far */
--			if (addr + mm->cached_hole_size < vma->vm_start)
--				mm->cached_hole_size = vma->vm_start - addr;
-+			if (addr + mm->cached_hole_size < vm_start)
-+				mm->cached_hole_size = vm_start - addr;
- 
- 			/* try just below the current vma->vm_start */
--			addr = vma->vm_start - len;
-+			addr = vm_start - len;
- 			if (do_color_align)
- 				addr = COLOUR_ALIGN_DOWN(addr, pgoff);
--		} while (likely(len < vma->vm_start));
-+		} while (likely(len < vm_start));
- 
- bottomup:
- 		/*
---- a/arch/parisc/kernel/sys_parisc.c
-+++ b/arch/parisc/kernel/sys_parisc.c
-@@ -35,17 +35,27 @@
- 
- static unsigned long get_unshared_area(unsigned long addr, unsigned long len)
- {
--	struct vm_area_struct *vma;
-+	struct vm_area_struct *vma, *prev;
-+	unsigned long prev_end;
- 
- 	addr = PAGE_ALIGN(addr);
- 
--	for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
-+	for (vma = find_vma_prev(current->mm, addr, &prev); ; prev = vma,
-+							vma = vma->vm_next) {
-+		if (prev) {
-+			prev_end = vm_end_gap(prev);
-+			if (addr < prev_end) {
-+				addr = prev_end;
-+				/* If vma already violates gap, forget it */
-+				if (vma && addr > vma->vm_start)
-+					addr = vma->vm_start;
-+			}
-+		}
- 		/* At this point:  (!vma || addr < vma->vm_end). */
- 		if (TASK_SIZE - len < addr)
- 			return -ENOMEM;
--		if (!vma || addr + len <= vma->vm_start)
-+		if (!vma || addr + len <= vm_start_gap(vma))
- 			return addr;
--		addr = vma->vm_end;
- 	}
- }
- 
-@@ -70,22 +80,32 @@ static int get_offset(struct address_spa
- static unsigned long get_shared_area(struct address_space *mapping,
- 		unsigned long addr, unsigned long len, unsigned long pgoff)
- {
--	struct vm_area_struct *vma;
-+	struct vm_area_struct *vma, *prev;
-+	unsigned long prev_end;
- 	int offset = mapping ? get_offset(mapping) : 0;
- 
- 	offset = (offset + (pgoff << PAGE_SHIFT)) & 0x3FF000;
- 
- 	addr = DCACHE_ALIGN(addr - offset) + offset;
- 
--	for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
-+	for (vma = find_vma_prev(current->mm, addr, &prev); ; prev = vma,
-+							vma = vma->vm_next) {
-+		if (prev) {
-+			prev_end = vm_end_gap(prev);
-+			if (addr < prev_end) {
-+				addr = DCACHE_ALIGN(prev_end - offset) + offset;
-+				if (addr < prev_end)	/* handle wraparound */
-+					return -ENOMEM;
-+				/* If vma already violates gap, forget it */
-+				if (vma && addr > vma->vm_start)
-+					addr = vma->vm_start;
-+			}
-+		}
- 		/* At this point:  (!vma || addr < vma->vm_end). */
- 		if (TASK_SIZE - len < addr)
- 			return -ENOMEM;
--		if (!vma || addr + len <= vma->vm_start)
-+		if (!vma || addr + len <= vm_start_gap(vma))
- 			return addr;
--		addr = DCACHE_ALIGN(vma->vm_end - offset) + offset;
--		if (addr < vma->vm_end) /* handle wraparound */
--			return -ENOMEM;
- 	}
- }
- 
---- a/arch/powerpc/mm/slice.c
-+++ b/arch/powerpc/mm/slice.c
-@@ -98,7 +98,7 @@ static int slice_area_is_free(struct mm_
- 	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)
-@@ -227,7 +227,7 @@ static unsigned long slice_find_area_bot
- 					      int psize, int use_cache)
- {
- 	struct vm_area_struct *vma;
--	unsigned long start_addr, addr;
-+	unsigned long start_addr, addr, vm_start;
- 	struct slice_mask mask;
- 	int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT);
- 
-@@ -256,7 +256,9 @@ full_search:
- 				addr = _ALIGN_UP(addr + 1,  1ul << SLICE_HIGH_SHIFT);
- 			continue;
- 		}
--		if (!vma || addr + len <= vma->vm_start) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (!vma || addr + len <= vm_start) {
- 			/*
- 			 * Remember the place where we stopped the search:
- 			 */
-@@ -264,8 +266,8 @@ full_search:
- 				mm->free_area_cache = addr + len;
- 			return addr;
- 		}
--		if (use_cache && (addr + mm->cached_hole_size) < vma->vm_start)
--		        mm->cached_hole_size = vma->vm_start - addr;
-+		if (use_cache && (addr + mm->cached_hole_size) < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 		addr = vma->vm_end;
- 	}
- 
-@@ -284,7 +286,7 @@ static unsigned long slice_find_area_top
- 					     int psize, int use_cache)
- {
- 	struct vm_area_struct *vma;
--	unsigned long addr;
-+	unsigned long addr, vm_start;
- 	struct slice_mask mask;
- 	int pshift = max_t(int, mmu_psize_defs[psize].shift, PAGE_SHIFT);
- 
-@@ -336,7 +338,9 @@ static unsigned long slice_find_area_top
- 		 * return with success:
- 		 */
- 		vma = find_vma(mm, addr);
--		if (!vma || (addr + len) <= vma->vm_start) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (!vma || (addr + len) <= vm_start) {
- 			/* remember the address as a hint for next time */
- 			if (use_cache)
- 				mm->free_area_cache = addr;
-@@ -344,11 +348,11 @@ static unsigned long slice_find_area_top
- 		}
- 
- 		/* remember the largest hole we saw so far */
--		if (use_cache && (addr + mm->cached_hole_size) < vma->vm_start)
--		        mm->cached_hole_size = vma->vm_start - addr;
-+		if (use_cache && (addr + mm->cached_hole_size) < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 
- 		/* try just below the current vma->vm_start */
--		addr = vma->vm_start;
-+		addr = vm_start;
- 	}
- 
- 	/*
---- a/arch/sh/mm/mmap.c
-+++ b/arch/sh/mm/mmap.c
-@@ -47,7 +47,7 @@ unsigned long arch_get_unmapped_area(str
- {
- 	struct mm_struct *mm = current->mm;
- 	struct vm_area_struct *vma;
--	unsigned long start_addr;
-+	unsigned long start_addr, vm_start;
- 	int do_colour_align;
- 
- 	if (flags & MAP_FIXED) {
-@@ -75,7 +75,7 @@ unsigned long arch_get_unmapped_area(str
- 
- 		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;
- 	}
- 
-@@ -106,15 +106,17 @@ full_search:
- 			}
- 			return -ENOMEM;
- 		}
--		if (likely(!vma || addr + len <= vma->vm_start)) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (likely(!vma || addr + len <= vm_start)) {
- 			/*
- 			 * Remember the place where we stopped the search:
- 			 */
- 			mm->free_area_cache = addr + len;
- 			return addr;
- 		}
--		if (addr + mm->cached_hole_size < vma->vm_start)
--		        mm->cached_hole_size = vma->vm_start - addr;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 
- 		addr = vma->vm_end;
- 		if (do_colour_align)
-@@ -130,6 +132,7 @@ arch_get_unmapped_area_topdown(struct fi
- 	struct vm_area_struct *vma;
- 	struct mm_struct *mm = current->mm;
- 	unsigned long addr = addr0;
-+	unsigned long vm_start;
- 	int do_colour_align;
- 
- 	if (flags & MAP_FIXED) {
-@@ -158,7 +161,7 @@ arch_get_unmapped_area_topdown(struct fi
- 
- 		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;
- 	}
- 
-@@ -179,7 +182,7 @@ arch_get_unmapped_area_topdown(struct fi
- 	/* make sure it can fit in the remaining address space */
- 	if (likely(addr > len)) {
- 		vma = find_vma(mm, addr-len);
--		if (!vma || addr <= vma->vm_start) {
-+		if (!vma || addr <= vm_start_gap(vma)) {
- 			/* remember the address as a hint for next time */
- 			return (mm->free_area_cache = addr-len);
- 		}
-@@ -199,20 +202,22 @@ arch_get_unmapped_area_topdown(struct fi
- 		 * return with success:
- 		 */
- 		vma = find_vma(mm, addr);
--		if (likely(!vma || addr+len <= vma->vm_start)) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (likely(!vma || addr + len <= vm_start)) {
- 			/* remember the address as a hint for next time */
- 			return (mm->free_area_cache = addr);
- 		}
- 
- 		/* remember the largest hole we saw so far */
--		if (addr + mm->cached_hole_size < vma->vm_start)
--		        mm->cached_hole_size = vma->vm_start - addr;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 
- 		/* try just below the current vma->vm_start */
--		addr = vma->vm_start-len;
-+		addr = vm_start-len;
- 		if (do_colour_align)
- 			addr = COLOUR_ALIGN_DOWN(addr, pgoff);
--	} while (likely(len < vma->vm_start));
-+	} while (likely(len < vm_start));
- 
- bottomup:
- 	/*
---- a/arch/sparc/kernel/sys_sparc_32.c
-+++ b/arch/sparc/kernel/sys_sparc_32.c
-@@ -71,7 +71,7 @@ unsigned long arch_get_unmapped_area(str
- 		}
- 		if (TASK_SIZE - PAGE_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)
---- a/arch/sparc/kernel/sys_sparc_64.c
-+++ b/arch/sparc/kernel/sys_sparc_64.c
-@@ -117,7 +117,7 @@ unsigned long arch_get_unmapped_area(str
- 	struct mm_struct *mm = current->mm;
- 	struct vm_area_struct * vma;
- 	unsigned long task_size = TASK_SIZE;
--	unsigned long start_addr;
-+	unsigned long start_addr, vm_start;
- 	int do_color_align;
- 
- 	if (flags & MAP_FIXED) {
-@@ -147,7 +147,7 @@ unsigned long arch_get_unmapped_area(str
- 
- 		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;
- 	}
- 
-@@ -181,15 +181,17 @@ full_search:
- 			}
- 			return -ENOMEM;
- 		}
--		if (likely(!vma || addr + len <= vma->vm_start)) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (likely(!vma || addr + len <= vm_start)) {
- 			/*
- 			 * Remember the place where we stopped the search:
- 			 */
- 			mm->free_area_cache = addr + len;
- 			return addr;
- 		}
--		if (addr + mm->cached_hole_size < vma->vm_start)
--		        mm->cached_hole_size = vma->vm_start - addr;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 
- 		addr = vma->vm_end;
- 		if (do_color_align)
-@@ -205,7 +207,7 @@ arch_get_unmapped_area_topdown(struct fi
- 	struct vm_area_struct *vma;
- 	struct mm_struct *mm = current->mm;
- 	unsigned long task_size = STACK_TOP32;
--	unsigned long addr = addr0;
-+	unsigned long addr = addr0, vm_start;
- 	int do_color_align;
- 
- 	/* This should only ever run for 32-bit processes.  */
-@@ -237,7 +239,7 @@ arch_get_unmapped_area_topdown(struct fi
- 
- 		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;
- 	}
- 
-@@ -258,7 +260,7 @@ arch_get_unmapped_area_topdown(struct fi
- 	/* make sure it can fit in the remaining address space */
- 	if (likely(addr > len)) {
- 		vma = find_vma(mm, addr-len);
--		if (!vma || addr <= vma->vm_start) {
-+		if (!vma || addr <= vm_start_gap(vma)) {
- 			/* remember the address as a hint for next time */
- 			return (mm->free_area_cache = addr-len);
- 		}
-@@ -278,20 +280,22 @@ arch_get_unmapped_area_topdown(struct fi
- 		 * return with success:
- 		 */
- 		vma = find_vma(mm, addr);
--		if (likely(!vma || addr+len <= vma->vm_start)) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (likely(!vma || addr + len <= vm_start)) {
- 			/* remember the address as a hint for next time */
- 			return (mm->free_area_cache = addr);
- 		}
- 
-  		/* remember the largest hole we saw so far */
-- 		if (addr + mm->cached_hole_size < vma->vm_start)
-- 		        mm->cached_hole_size = vma->vm_start - addr;
-+ 		if (addr + mm->cached_hole_size < vm_start)
-+ 		        mm->cached_hole_size = vm_start - addr;
- 
- 		/* try just below the current vma->vm_start */
--		addr = vma->vm_start-len;
-+		addr = vm_start - len;
- 		if (do_color_align)
- 			addr = COLOUR_ALIGN_DOWN(addr, pgoff);
--	} while (likely(len < vma->vm_start));
-+	} while (likely(len < vm_start));
- 
- bottomup:
- 	/*
---- a/arch/sparc/mm/hugetlbpage.c
-+++ b/arch/sparc/mm/hugetlbpage.c
-@@ -33,7 +33,7 @@ static unsigned long hugetlb_get_unmappe
- 	struct mm_struct *mm = current->mm;
- 	struct vm_area_struct * vma;
- 	unsigned long task_size = TASK_SIZE;
--	unsigned long start_addr;
-+	unsigned long start_addr, vm_start;
- 
- 	if (test_thread_flag(TIF_32BIT))
- 		task_size = STACK_TOP32;
-@@ -67,15 +67,17 @@ full_search:
- 			}
- 			return -ENOMEM;
- 		}
--		if (likely(!vma || addr + len <= vma->vm_start)) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (likely(!vma || addr + len <= vm_start)) {
- 			/*
- 			 * Remember the place where we stopped the search:
- 			 */
- 			mm->free_area_cache = addr + len;
- 			return addr;
- 		}
--		if (addr + mm->cached_hole_size < vma->vm_start)
--		        mm->cached_hole_size = vma->vm_start - addr;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 
- 		addr = ALIGN(vma->vm_end, HPAGE_SIZE);
- 	}
-@@ -90,6 +92,7 @@ hugetlb_get_unmapped_area_topdown(struct
- 	struct vm_area_struct *vma;
- 	struct mm_struct *mm = current->mm;
- 	unsigned long addr = addr0;
-+	unsigned long vm_start;
- 
- 	/* This should only ever run for 32-bit processes.  */
- 	BUG_ON(!test_thread_flag(TIF_32BIT));
-@@ -106,7 +109,7 @@ hugetlb_get_unmapped_area_topdown(struct
- 	/* make sure it can fit in the remaining address space */
- 	if (likely(addr > len)) {
- 		vma = find_vma(mm, addr-len);
--		if (!vma || addr <= vma->vm_start) {
-+		if (!vma || addr <= vm_start_gap(vma)) {
- 			/* remember the address as a hint for next time */
- 			return (mm->free_area_cache = addr-len);
- 		}
-@@ -124,18 +127,20 @@ hugetlb_get_unmapped_area_topdown(struct
- 		 * return with success:
- 		 */
- 		vma = find_vma(mm, addr);
--		if (likely(!vma || addr+len <= vma->vm_start)) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (likely(!vma || addr + len <= vm_start)) {
- 			/* remember the address as a hint for next time */
- 			return (mm->free_area_cache = addr);
- 		}
- 
-  		/* remember the largest hole we saw so far */
-- 		if (addr + mm->cached_hole_size < vma->vm_start)
-- 		        mm->cached_hole_size = vma->vm_start - addr;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 
- 		/* try just below the current vma->vm_start */
--		addr = (vma->vm_start-len) & HPAGE_MASK;
--	} while (likely(len < vma->vm_start));
-+		addr = (vm_start - len) & HPAGE_MASK;
-+	} while (likely(len < vm_start));
- 
- bottomup:
- 	/*
-@@ -182,7 +187,7 @@ hugetlb_get_unmapped_area(struct file *f
- 		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)
---- a/arch/tile/mm/hugetlbpage.c
-+++ b/arch/tile/mm/hugetlbpage.c
-@@ -159,7 +159,7 @@ static unsigned long hugetlb_get_unmappe
- 	struct hstate *h = hstate_file(file);
- 	struct mm_struct *mm = current->mm;
- 	struct vm_area_struct *vma;
--	unsigned long start_addr;
-+	unsigned long start_addr, vm_start;
- 
- 	if (len > mm->cached_hole_size) {
- 		start_addr = mm->free_area_cache;
-@@ -185,12 +185,14 @@ full_search:
- 			}
- 			return -ENOMEM;
- 		}
--		if (!vma || addr + len <= vma->vm_start) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (!vma || addr + len <= vm_start) {
- 			mm->free_area_cache = addr + len;
- 			return addr;
- 		}
--		if (addr + mm->cached_hole_size < vma->vm_start)
--			mm->cached_hole_size = vma->vm_start - addr;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 		addr = ALIGN(vma->vm_end, huge_page_size(h));
- 	}
- }
-@@ -204,6 +206,7 @@ static unsigned long hugetlb_get_unmappe
- 	struct vm_area_struct *vma, *prev_vma;
- 	unsigned long base = mm->mmap_base, addr = addr0;
- 	unsigned long largest_hole = mm->cached_hole_size;
-+	unsigned long vm_start;
- 	int first_time = 1;
- 
- 	/* don't allow allocations above current base */
-@@ -234,9 +237,10 @@ try_again:
- 
- 		/*
- 		 * new region fits between prev_vma->vm_end and
--		 * vma->vm_start, use it:
-+		 * vm_start, use it:
- 		 */
--		if (addr + len <= vma->vm_start &&
-+		vm_start = vm_start_gap(vma);
-+		if (addr + len <= vm_start &&
- 			    (!prev_vma || (addr >= prev_vma->vm_end))) {
- 			/* remember the address as a hint for next time */
- 			mm->cached_hole_size = largest_hole;
-@@ -251,13 +255,13 @@ try_again:
- 		}
- 
- 		/* remember the largest hole we saw so far */
--		if (addr + largest_hole < vma->vm_start)
--			largest_hole = vma->vm_start - addr;
-+		if (addr + largest_hole < vm_start)
-+			largest_hole = vm_start - addr;
- 
- 		/* try just below the current vma->vm_start */
--		addr = (vma->vm_start - len) & huge_page_mask(h);
-+		addr = (vm_start - len) & huge_page_mask(h);
- 
--	} while (len <= vma->vm_start);
-+	} while (len <= vm_start);
- 
- fail:
- 	/*
-@@ -312,7 +316,7 @@ unsigned long hugetlb_get_unmapped_area(
- 		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)
---- a/arch/x86/kernel/sys_x86_64.c
-+++ b/arch/x86/kernel/sys_x86_64.c
-@@ -126,7 +126,7 @@ arch_get_unmapped_area(struct file *filp
- {
- 	struct mm_struct *mm = current->mm;
- 	struct vm_area_struct *vma;
--	unsigned long start_addr;
-+	unsigned long start_addr, vm_start;
- 	unsigned long begin, end;
- 
- 	if (flags & MAP_FIXED)
-@@ -141,7 +141,7 @@ arch_get_unmapped_area(struct file *filp
- 		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;
- 	}
- 	if (((flags & MAP_32BIT) || test_thread_flag(TIF_IA32))
-@@ -172,15 +172,17 @@ full_search:
- 			}
- 			return -ENOMEM;
- 		}
--		if (!vma || addr + len <= vma->vm_start) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (!vma || addr + len <= vm_start) {
- 			/*
- 			 * Remember the place where we stopped the search:
- 			 */
- 			mm->free_area_cache = addr + len;
- 			return addr;
- 		}
--		if (addr + mm->cached_hole_size < vma->vm_start)
--			mm->cached_hole_size = vma->vm_start - addr;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 
- 		addr = vma->vm_end;
- 		addr = align_addr(addr, filp, 0);
-@@ -196,6 +198,7 @@ arch_get_unmapped_area_topdown(struct fi
- 	struct vm_area_struct *vma;
- 	struct mm_struct *mm = current->mm;
- 	unsigned long addr = addr0;
-+	unsigned long vm_start;
- 
- 	/* requested length too big for entire address space */
- 	if (len > TASK_SIZE)
-@@ -213,7 +216,7 @@ arch_get_unmapped_area_topdown(struct fi
- 		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;
- 	}
- 
-@@ -232,7 +235,7 @@ arch_get_unmapped_area_topdown(struct fi
- 						    ALIGN_TOPDOWN);
- 
- 		vma = find_vma(mm, tmp_addr);
--		if (!vma || tmp_addr + len <= vma->vm_start)
-+		if (!vma || tmp_addr + len <= vm_start_gap(vma))
- 			/* remember the address as a hint for next time */
- 			return mm->free_area_cache = tmp_addr;
- 	}
-@@ -251,17 +254,19 @@ arch_get_unmapped_area_topdown(struct fi
- 		 * return with success:
- 		 */
- 		vma = find_vma(mm, addr);
--		if (!vma || addr+len <= vma->vm_start)
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (!vma || addr + len <= vm_start)
- 			/* remember the address as a hint for next time */
- 			return mm->free_area_cache = addr;
- 
- 		/* remember the largest hole we saw so far */
--		if (addr + mm->cached_hole_size < vma->vm_start)
--			mm->cached_hole_size = vma->vm_start - addr;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 
- 		/* try just below the current vma->vm_start */
--		addr = vma->vm_start-len;
--	} while (len < vma->vm_start);
-+		addr = vm_start - len;
-+	} while (len < vm_start);
- 
- bottomup:
- 	/*
---- a/arch/x86/mm/hugetlbpage.c
-+++ b/arch/x86/mm/hugetlbpage.c
-@@ -277,7 +277,7 @@ static unsigned long hugetlb_get_unmappe
- 	struct hstate *h = hstate_file(file);
- 	struct mm_struct *mm = current->mm;
- 	struct vm_area_struct *vma;
--	unsigned long start_addr;
-+	unsigned long start_addr, vm_start;
- 
- 	if (len > mm->cached_hole_size) {
- 	        start_addr = mm->free_area_cache;
-@@ -303,12 +303,14 @@ full_search:
- 			}
- 			return -ENOMEM;
- 		}
--		if (!vma || addr + len <= vma->vm_start) {
-+		if (vma)
-+			vm_start = vm_start_gap(vma);
-+		if (!vma || addr + len <= vm_start) {
- 			mm->free_area_cache = addr + len;
- 			return addr;
- 		}
--		if (addr + mm->cached_hole_size < vma->vm_start)
--		        mm->cached_hole_size = vma->vm_start - addr;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 		addr = ALIGN(vma->vm_end, huge_page_size(h));
- 	}
- }
-@@ -322,6 +324,7 @@ static unsigned long hugetlb_get_unmappe
- 	struct vm_area_struct *vma, *prev_vma;
- 	unsigned long base = mm->mmap_base, addr = addr0;
- 	unsigned long largest_hole = mm->cached_hole_size;
-+	unsigned long vm_start;
- 	int first_time = 1;
- 
- 	/* don't allow allocations above current base */
-@@ -351,7 +354,8 @@ try_again:
- 		 * new region fits between prev_vma->vm_end and
- 		 * vma->vm_start, use it:
- 		 */
--		if (addr + len <= vma->vm_start &&
-+		vm_start = vm_start_gap(vma);
-+		if (addr + len <= vm_start &&
- 		            (!prev_vma || (addr >= prev_vma->vm_end))) {
- 			/* remember the address as a hint for next time */
- 		        mm->cached_hole_size = largest_hole;
-@@ -365,12 +369,12 @@ try_again:
- 		}
- 
- 		/* remember the largest hole we saw so far */
--		if (addr + largest_hole < vma->vm_start)
--		        largest_hole = vma->vm_start - addr;
-+		if (addr + largest_hole < vm_start)
-+			largest_hole = vm_start - addr;
- 
- 		/* try just below the current vma->vm_start */
--		addr = (vma->vm_start - len) & huge_page_mask(h);
--	} while (len <= vma->vm_start);
-+		addr = (vm_start - len) & huge_page_mask(h);
-+	} while (len <= vm_start);
- 
- fail:
- 	/*
-@@ -426,7 +430,7 @@ hugetlb_get_unmapped_area(struct file *f
- 		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)
---- a/fs/hugetlbfs/inode.c
-+++ b/fs/hugetlbfs/inode.c
-@@ -150,7 +150,7 @@ hugetlb_get_unmapped_area(struct file *f
- 		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;
- 	}
- 
-@@ -176,7 +176,7 @@ full_search:
- 			return -ENOMEM;
- 		}
- 
--		if (!vma || addr + len <= vma->vm_start)
-+		if (!vma || addr + len <= vm_start_gap(vma))
- 			return addr;
- 		addr = ALIGN(vma->vm_end, huge_page_size(h));
- 	}
---- a/fs/proc/task_mmu.c
-+++ b/fs/proc/task_mmu.c
-@@ -230,11 +230,7 @@ static void show_map_vma(struct seq_file
- 
- 	/* 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,
---- a/include/linux/mm.h
-+++ b/include/linux/mm.h
-@@ -1015,34 +1015,6 @@ 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 unsigned long move_page_tables(struct vm_area_struct *vma,
- 		unsigned long old_addr, struct vm_area_struct *new_vma,
- 		unsigned long new_addr, unsigned long len);
-@@ -1462,6 +1434,7 @@ unsigned long ra_submit(struct file_ra_s
- 			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);
- 
-@@ -1490,6 +1463,30 @@ static inline struct vm_area_struct * fi
- 	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;
---- a/mm/memory.c
-+++ b/mm/memory.c
-@@ -1605,12 +1605,6 @@ 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
-@@ -1761,11 +1755,6 @@ int __get_user_pages(struct task_struct
- 				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)
-@@ -3122,40 +3111,6 @@ 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;
--
--		return 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;
--
--		return 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.
-@@ -3174,10 +3129,6 @@ static int do_anonymous_page(struct mm_s
- 	if (vma->vm_flags & VM_SHARED)
- 		return VM_FAULT_SIGBUS;
- 
--	/* Check if we need to add a guard page to the stack */
--	if (check_stack_guard_page(vma, address) < 0)
--		return VM_FAULT_SIGSEGV;
--
- 	/* Use the zero-page for reads */
- 	if (!(flags & FAULT_FLAG_WRITE)) {
- 		entry = pte_mkspecial(pfn_pte(my_zero_pfn(address),
---- a/mm/mmap.c
-+++ b/mm/mmap.c
-@@ -245,6 +245,7 @@ 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;
- 
- 	down_write(&mm->mmap_sem);
-@@ -289,7 +290,8 @@ 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. */
-@@ -1368,8 +1370,8 @@ arch_get_unmapped_area(struct file *filp
- 		unsigned long len, unsigned long pgoff, unsigned long flags)
- {
- 	struct mm_struct *mm = current->mm;
--	struct vm_area_struct *vma;
--	unsigned long start_addr;
-+	struct vm_area_struct *vma, *prev;
-+	unsigned long start_addr, vm_start, prev_end;
- 
- 	if (len > TASK_SIZE - mmap_min_addr)
- 		return -ENOMEM;
-@@ -1379,9 +1381,10 @@ arch_get_unmapped_area(struct file *filp
- 
- 	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;
- 	}
- 	if (len > mm->cached_hole_size) {
-@@ -1392,7 +1395,17 @@ arch_get_unmapped_area(struct file *filp
- 	}
- 
- full_search:
--	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
-+	for (vma = find_vma_prev(mm, addr, &prev); ; prev = vma,
-+						vma = vma->vm_next) {
-+		if (prev) {
-+			prev_end = vm_end_gap(prev);
-+			if (addr < prev_end) {
-+				addr = prev_end;
-+				/* If vma already violates gap, forget it */
-+				if (vma && addr > vma->vm_start)
-+					addr = vma->vm_start;
-+			}
-+		}
- 		/* At this point:  (!vma || addr < vma->vm_end). */
- 		if (TASK_SIZE - len < addr) {
- 			/*
-@@ -1407,16 +1420,16 @@ full_search:
- 			}
- 			return -ENOMEM;
- 		}
--		if (!vma || addr + len <= vma->vm_start) {
-+		vm_start = vma ? vm_start_gap(vma) : TASK_SIZE;
-+		if (addr + len <= vm_start) {
- 			/*
- 			 * Remember the place where we stopped the search:
- 			 */
- 			mm->free_area_cache = addr + len;
- 			return addr;
- 		}
--		if (addr + mm->cached_hole_size < vma->vm_start)
--		        mm->cached_hole_size = vma->vm_start - addr;
--		addr = vma->vm_end;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 	}
- }
- #endif	
-@@ -1442,9 +1455,10 @@ arch_get_unmapped_area_topdown(struct fi
- 			  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;
-+	unsigned long vm_start, prev_end;
- 	unsigned long low_limit = max(PAGE_SIZE, mmap_min_addr);
- 
- 	/* requested length too big for entire address space */
-@@ -1457,9 +1471,10 @@ arch_get_unmapped_area_topdown(struct fi
- 	/* 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;
- 	}
- 
-@@ -1474,8 +1489,9 @@ arch_get_unmapped_area_topdown(struct fi
- 
- 	/* make sure it can fit in the remaining address space */
- 	if (addr >= low_limit + len) {
--		vma = find_vma(mm, addr-len);
--		if (!vma || addr <= vma->vm_start)
-+		vma = find_vma_prev(mm, addr-len, &prev);
-+		if ((!vma || addr <= vm_start_gap(vma)) &&
-+		    (!prev || addr-len >= vm_end_gap(prev)))
- 			/* remember the address as a hint for next time */
- 			return (mm->free_area_cache = addr-len);
- 	}
-@@ -1491,18 +1507,21 @@ arch_get_unmapped_area_topdown(struct fi
- 		 * else if new region fits below vma->vm_start,
- 		 * return with success:
- 		 */
--		vma = find_vma(mm, addr);
--		if (!vma || addr+len <= vma->vm_start)
-+		vma = find_vma_prev(mm, addr, &prev);
-+		vm_start = vma ? vm_start_gap(vma) : mm->mmap_base;
-+		prev_end = prev ? vm_end_gap(prev) : low_limit;
-+
-+		if (addr + len <= vm_start && addr >= prev_end)
- 			/* remember the address as a hint for next time */
- 			return (mm->free_area_cache = addr);
- 
-  		/* remember the largest hole we saw so far */
-- 		if (addr + mm->cached_hole_size < vma->vm_start)
-- 		        mm->cached_hole_size = vma->vm_start - addr;
-+		if (addr + mm->cached_hole_size < vm_start)
-+			mm->cached_hole_size = vm_start - addr;
- 
- 		/* try just below the current vma->vm_start */
--		addr = vma->vm_start-len;
--	} while (vma->vm_start >= low_limit + len);
-+		addr = vm_start - len;
-+	} while (vm_start >= low_limit + len);
- 
- bottomup:
- 	/*
-@@ -1647,21 +1666,19 @@ out:
-  * update accounting. This is shared with both the
-  * grow-up and grow-down cases.
-  */
--static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, unsigned long grow)
-+static int acct_stack_growth(struct vm_area_struct *vma,
-+			     unsigned long size, unsigned long grow)
- {
- 	struct mm_struct *mm = vma->vm_mm;
- 	struct rlimit *rlim = current->signal->rlim;
--	unsigned long new_start, actual_size;
-+	unsigned long new_start;
- 
- 	/* address space limit tests */
- 	if (!may_expand_vm(mm, grow))
- 		return -ENOMEM;
- 
- 	/* Stack limit test */
--	actual_size = size;
--	if (size && (vma->vm_flags & (VM_GROWSUP | VM_GROWSDOWN)))
--		actual_size -= PAGE_SIZE;
--	if (actual_size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur))
-+	if (size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur))
- 		return -ENOMEM;
- 
- 	/* mlock limit tests */
-@@ -1703,32 +1720,40 @@ static int acct_stack_growth(struct vm_a
-  */
- 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) {
-@@ -1758,27 +1783,36 @@ int expand_upwards(struct vm_area_struct
- 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_file_mmap(NULL, 0, 0, 0, address, 1);
- 	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) {
-@@ -1802,28 +1836,25 @@ int expand_downwards(struct vm_area_stru
- 	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);
- }
- 
-@@ -1846,14 +1877,6 @@ find_extend_vma(struct mm_struct *mm, un
- #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);
- }
- 
diff --git a/debian/patches/series b/debian/patches/series
index d1b8b0d..65c2ca3 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -1110,8 +1110,6 @@ bugfix/all/timer-restrict-timer_stats-to-initial-pid-namespace.patch
 bugfix/all/ipv6-xfrm-handle-errors-reported-by-xfrm6_find_1stfr.patch
 features/all/net-add-kfree_skb_list.patch
 bugfix/all/ipv6-fix-leak-in-ipv6_gso_segment.patch
-bugfix/all/mm-do-not-grow-the-stack-vma-just-because-of-an-over.patch
-bugfix/all/mm-larger-stack-guard-gap-between-vmas.patch
 bugfix/arm/mm-larger-stack-guard-gap-between-vmas-arm-topdown.patch
 
 # ABI maintenance

-- 
Alioth's /usr/local/bin/git-commit-notice on /srv/git.debian.org/git/kernel/linux.git



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