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SubjectLinux 3.2.90
From
Date
I'm announcing the release of the 3.2.90 kernel.

All users of the 3.2 kernel series should upgrade.

The updated 3.2.y git tree can be found at:
        https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-3.2.y
and can be browsed at the normal kernel.org git web browser:
        https://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git

The diff from 3.2.89 is attached to this message.

Ben.

------------

 Documentation/kernel-parameters.txt |   7 ++
 Makefile                            |   2 +-
 arch/alpha/kernel/osf_sys.c         |   2 +-
 arch/arm/mm/mmap.c                  |  12 ++-
 arch/frv/mm/elf-fdpic.c             |   6 +-
 arch/ia64/kernel/sys_ia64.c         |  18 +++-
 arch/ia64/mm/hugetlbpage.c          |   4 +-
 arch/mips/mm/mmap.c                 |  19 ++--
 arch/parisc/kernel/sys_parisc.c     |  40 ++++++--
 arch/powerpc/mm/slice.c             |  24 +++--
 arch/sh/mm/mmap.c                   |  29 +++---
 arch/sparc/kernel/sys_sparc_32.c    |   2 +-
 arch/sparc/kernel/sys_sparc_64.c    |  30 +++---
 arch/sparc/mm/hugetlbpage.c         |  27 +++---
 arch/tile/mm/hugetlbpage.c          |  26 ++---
 arch/x86/kernel/sys_x86_64.c        |  29 +++---
 arch/x86/mm/hugetlbpage.c           |  24 +++--
 fs/hugetlbfs/inode.c                |   4 +-
 fs/proc/task_mmu.c                  |   4 -
 include/linux/mm.h                  |  53 +++++-----
 mm/memory.c                         |  49 ----------
 mm/mmap.c                           | 189 ++++++++++++++++++++++--------------
 net/rxrpc/ar-key.c                  |  64 ++++++------
 23 files changed, 363 insertions(+), 301 deletions(-)

Ben Hutchings (1):
      Linux 3.2.90

David Howells (1):
      rxrpc: Fix several cases where a padded len isn't checked in ticket decode

Helge Deller (1):
      Allow stack to grow up to address space limit

Hugh Dickins (1):
      mm: larger stack guard gap, between vmas

KOSAKI Motohiro (1):
      mm: simplify find_vma_prev()

Linus Torvalds (1):
      mm: do not grow the stack vma just because of an overrun on preceding vma

Mikulas Patocka (1):
      mm: fix find_vma_prev

--
Ben Hutchings
Larkinson's Law: All laws are basically false.

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index ac601c4b9f57..356bf4b4273b 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2457,6 +2457,13 @@ 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/Makefile b/Makefile
index df4aefae8171..efe5c9704afa 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
VERSION = 3
PATCHLEVEL = 2
-SUBLEVEL = 89
+SUBLEVEL = 90
EXTRAVERSION =
NAME = Saber-toothed Squirrel

diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 01e8715e26d9..b9abe5bb437b 100644
--- 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 addr, unsigned long len,
/* 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_gap(vma))
return addr;
addr = vma->vm_end;
vma = vma->vm_next;
diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
index 44b628e4d6ea..4497b5ef688e 100644
--- a/arch/arm/mm/mmap.c
+++ b/arch/arm/mm/mmap.c
@@ -30,7 +30,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
{
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();

@@ -62,7 +62,7 @@ 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;
}
if (len > mm->cached_hole_size) {
@@ -96,15 +96,17 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
}
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);
diff --git a/arch/frv/mm/elf-fdpic.c b/arch/frv/mm/elf-fdpic.c
index 385fd30b142f..96eca58b9679 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;
}

@@ -89,7 +89,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
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(struct file *filp, unsigned long addr, unsi
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;
}
diff --git a/arch/ia64/kernel/sys_ia64.c b/arch/ia64/kernel/sys_ia64.c
index 609d50056a6c..77c0aff5aaf0 100644
--- a/arch/ia64/kernel/sys_ia64.c
+++ b/arch/ia64/kernel/sys_ia64.c
@@ -27,7 +27,8 @@ arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len
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 *filp, unsigned long addr, unsigned long len
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 *filp, unsigned long addr, unsigned long len
}
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;
}
}

diff --git a/arch/ia64/mm/hugetlbpage.c b/arch/ia64/mm/hugetlbpage.c
index 5ca674b74737..66a1ec0a2467 100644
--- a/arch/ia64/mm/hugetlbpage.c
+++ b/arch/ia64/mm/hugetlbpage.c
@@ -171,9 +171,9 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, u
/* 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);
}
}

diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c
index 302d779d5b0d..a79ddcfec1c7 100644
--- a/arch/mips/mm/mmap.c
+++ b/arch/mips/mm/mmap.c
@@ -70,6 +70,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
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_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;
}

@@ -118,7 +119,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
/* 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_area_common(struct file *filp,
/* 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_area_common(struct file *filp,
* 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:
/*
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index 7ea75d14aa65..1d4ac8d7cdd4 100644
--- 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_space *mapping)
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;
}
}

diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index 73709f7ce92c..57654c9b70f8 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -98,7 +98,7 @@ 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)
@@ -227,7 +227,7 @@ static unsigned long slice_find_area_bottomup(struct mm_struct *mm,
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 @@ static unsigned long slice_find_area_bottomup(struct mm_struct *mm,
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 @@ static unsigned long slice_find_area_bottomup(struct mm_struct *mm,
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_topdown(struct mm_struct *mm,
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_topdown(struct mm_struct *mm,
* 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_topdown(struct mm_struct *mm,
}

/* 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;
}

/*
diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c
index afeb710ec5c3..22eff46d8ef5 100644
--- a/arch/sh/mm/mmap.c
+++ b/arch/sh/mm/mmap.c
@@ -47,7 +47,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
{
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(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;
}

@@ -106,15 +106,17 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
}
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 file *filp, const unsigned long addr0,
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 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;
}

@@ -179,7 +182,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
/* 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 file *filp, const unsigned long addr0,
* 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:
/*
diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
index 42b282fa6112..eeae89bada55 100644
--- 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(struct file *filp, unsigned long addr, unsi
}
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)
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index a062fe9a4e49..39f49991575e 100644
--- 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(struct file *filp, unsigned long addr, unsi
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(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;
}

@@ -181,15 +181,17 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
}
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 file *filp, const unsigned long addr0,
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 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;
}

@@ -258,7 +260,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
/* 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 file *filp, const unsigned long addr0,
* 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:
/*
diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
index 07e14535375c..e13e85dbfcd9 100644
--- a/arch/sparc/mm/hugetlbpage.c
+++ b/arch/sparc/mm/hugetlbpage.c
@@ -33,7 +33,7 @@ static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
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 @@ static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
}
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 file *filp, const unsigned long addr0,
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 file *filp, const unsigned long addr0,
/* 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 file *filp, const unsigned long addr0,
* 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 *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 42cfcba4e1ef..184e0339c056 100644
--- a/arch/tile/mm/hugetlbpage.c
+++ b/arch/tile/mm/hugetlbpage.c
@@ -159,7 +159,7 @@ static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
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 @@ static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
}
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_unmapped_area_topdown(struct file *file,
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 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,

/*
* 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 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
}

/* 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(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 cdb2fc9235b7..0dbfff8e1a58 100644
--- 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, unsigned long addr,
{
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, 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;
}
if (((flags & MAP_32BIT) || test_thread_flag(TIF_IA32))
@@ -172,15 +172,17 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
}
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 file *filp, const unsigned long addr0,
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 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;
}

@@ -232,7 +235,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
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 file *filp, const unsigned long addr0,
* 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:
/*
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index df7d12c9af24..67b87605e223 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -277,7 +277,7 @@ static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
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 @@ static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
}
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_unmapped_area_topdown(struct file *file,
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 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
* 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 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
}

/* 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 *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/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 55573322d1bb..99c51d6cb925 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -150,7 +150,7 @@ 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;
}

@@ -176,7 +176,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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));
}
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index de404f204b6a..6037a132fc7f 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -230,11 +230,7 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)

/* 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 16394da01d2d..19f9043e3692 100644
--- 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_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);

@@ -1490,6 +1463,30 @@ 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 2917e9b2e4d4..6325103db6f3 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1605,12 +1605,6 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
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 *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)
@@ -3122,40 +3111,6 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
}

/*
- * 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_struct *mm, struct vm_area_struct *vma,
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),
diff --git a/mm/mmap.c b/mm/mmap.c
index 94f4e3444ae5..c7cbb405d5b3 100644
--- 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 addr,
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, 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;
}
if (len > mm->cached_hole_size) {
@@ -1392,7 +1395,17 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
}

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 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
}
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 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;
+ 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 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;
}

@@ -1474,8 +1489,9 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,

/* 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 file *filp, const unsigned long addr0,
* 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:
/*
@@ -1607,39 +1626,27 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)

EXPORT_SYMBOL(find_vma);

-/* Same as find_vma, but also return a pointer to the previous VMA in *pprev. */
+/*
+ * Same as find_vma, but also return a pointer to the previous VMA in *pprev.
+ */
struct vm_area_struct *
find_vma_prev(struct mm_struct *mm, unsigned long addr,
struct vm_area_struct **pprev)
{
- struct vm_area_struct *vma = NULL, *prev = NULL;
- struct rb_node *rb_node;
- if (!mm)
- goto out;
-
- /* Guard against addr being lower than the first VMA */
- vma = mm->mmap;
-
- /* Go through the RB tree quickly. */
- rb_node = mm->mm_rb.rb_node;
-
- while (rb_node) {
- struct vm_area_struct *vma_tmp;
- vma_tmp = rb_entry(rb_node, struct vm_area_struct, vm_rb);
+ struct vm_area_struct *vma;

- if (addr < vma_tmp->vm_end) {
- rb_node = rb_node->rb_left;
- } else {
- prev = vma_tmp;
- if (!prev->vm_next || (addr < prev->vm_next->vm_end))
- break;
+ vma = find_vma(mm, addr);
+ if (vma) {
+ *pprev = vma->vm_prev;
+ } else {
+ struct rb_node *rb_node = mm->mm_rb.rb_node;
+ *pprev = NULL;
+ while (rb_node) {
+ *pprev = rb_entry(rb_node, struct vm_area_struct, vm_rb);
rb_node = rb_node->rb_right;
}
}
-
-out:
- *pprev = prev;
- return prev ? prev->vm_next : vma;
+ return vma;
}

/*
@@ -1647,21 +1654,19 @@ find_vma_prev(struct mm_struct *mm, unsigned long addr,
* 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 +1708,43 @@ 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 exceeding limits of the address space. */
+ address &= PAGE_MASK;
+ if (address >= TASK_SIZE)
+ return -ENOMEM;
+ address += PAGE_SIZE;
+
+ /* Enforce stack_guard_gap */
+ gap_addr = address + stack_guard_gap;
+
+ /* 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))
+ 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 +1774,36 @@ 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_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) {
@@ -1802,6 +1827,22 @@ int expand_downwards(struct vm_area_struct *vma,
return error;
}

+/* 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)
{
diff --git a/net/rxrpc/ar-key.c b/net/rxrpc/ar-key.c
index 43ea7de2fc8e..9259f966b2a0 100644
--- a/net/rxrpc/ar-key.c
+++ b/net/rxrpc/ar-key.c
@@ -213,7 +213,7 @@ static int rxrpc_krb5_decode_principal(struct krb5_principal *princ,
unsigned *_toklen)
{
const __be32 *xdr = *_xdr;
- unsigned toklen = *_toklen, n_parts, loop, tmp;
+ unsigned int toklen = *_toklen, n_parts, loop, tmp, paddedlen;

/* there must be at least one name, and at least #names+1 length
* words */
@@ -243,16 +243,16 @@ static int rxrpc_krb5_decode_principal(struct krb5_principal *princ,
toklen -= 4;
if (tmp <= 0 || tmp > AFSTOKEN_STRING_MAX)
return -EINVAL;
- if (tmp > toklen)
+ paddedlen = (tmp + 3) & ~3;
+ if (paddedlen > toklen)
return -EINVAL;
princ->name_parts[loop] = kmalloc(tmp + 1, GFP_KERNEL);
if (!princ->name_parts[loop])
return -ENOMEM;
memcpy(princ->name_parts[loop], xdr, tmp);
princ->name_parts[loop][tmp] = 0;
- tmp = (tmp + 3) & ~3;
- toklen -= tmp;
- xdr += tmp >> 2;
+ toklen -= paddedlen;
+ xdr += paddedlen >> 2;
}

if (toklen < 4)
@@ -261,16 +261,16 @@ static int rxrpc_krb5_decode_principal(struct krb5_principal *princ,
toklen -= 4;
if (tmp <= 0 || tmp > AFSTOKEN_K5_REALM_MAX)
return -EINVAL;
- if (tmp > toklen)
+ paddedlen = (tmp + 3) & ~3;
+ if (paddedlen > toklen)
return -EINVAL;
princ->realm = kmalloc(tmp + 1, GFP_KERNEL);
if (!princ->realm)
return -ENOMEM;
memcpy(princ->realm, xdr, tmp);
princ->realm[tmp] = 0;
- tmp = (tmp + 3) & ~3;
- toklen -= tmp;
- xdr += tmp >> 2;
+ toklen -= paddedlen;
+ xdr += paddedlen >> 2;

_debug("%s/...@%s", princ->name_parts[0], princ->realm);

@@ -289,7 +289,7 @@ static int rxrpc_krb5_decode_tagged_data(struct krb5_tagged_data *td,
unsigned *_toklen)
{
const __be32 *xdr = *_xdr;
- unsigned toklen = *_toklen, len;
+ unsigned int toklen = *_toklen, len, paddedlen;

/* there must be at least one tag and one length word */
if (toklen <= 8)
@@ -303,6 +303,9 @@ static int rxrpc_krb5_decode_tagged_data(struct krb5_tagged_data *td,
toklen -= 8;
if (len > max_data_size)
return -EINVAL;
+ paddedlen = (len + 3) & ~3;
+ if (paddedlen > toklen)
+ return -EINVAL;
td->data_len = len;

if (len > 0) {
@@ -310,9 +313,8 @@ static int rxrpc_krb5_decode_tagged_data(struct krb5_tagged_data *td,
if (!td->data)
return -ENOMEM;
memcpy(td->data, xdr, len);
- len = (len + 3) & ~3;
- toklen -= len;
- xdr += len >> 2;
+ toklen -= paddedlen;
+ xdr += paddedlen >> 2;
}

_debug("tag %x len %x", td->tag, td->data_len);
@@ -384,7 +386,7 @@ static int rxrpc_krb5_decode_ticket(u8 **_ticket, u16 *_tktlen,
const __be32 **_xdr, unsigned *_toklen)
{
const __be32 *xdr = *_xdr;
- unsigned toklen = *_toklen, len;
+ unsigned int toklen = *_toklen, len, paddedlen;

/* there must be at least one length word */
if (toklen <= 4)
@@ -396,6 +398,9 @@ static int rxrpc_krb5_decode_ticket(u8 **_ticket, u16 *_tktlen,
toklen -= 4;
if (len > AFSTOKEN_K5_TIX_MAX)
return -EINVAL;
+ paddedlen = (len + 3) & ~3;
+ if (paddedlen > toklen)
+ return -EINVAL;
*_tktlen = len;

_debug("ticket len %u", len);
@@ -405,9 +410,8 @@ static int rxrpc_krb5_decode_ticket(u8 **_ticket, u16 *_tktlen,
if (!*_ticket)
return -ENOMEM;
memcpy(*_ticket, xdr, len);
- len = (len + 3) & ~3;
- toklen -= len;
- xdr += len >> 2;
+ toklen -= paddedlen;
+ xdr += paddedlen >> 2;
}

*_xdr = xdr;
@@ -551,7 +555,7 @@ static int rxrpc_instantiate_xdr(struct key *key, const void *data, size_t datal
{
const __be32 *xdr = data, *token;
const char *cp;
- unsigned len, tmp, loop, ntoken, toklen, sec_ix;
+ unsigned int len, paddedlen, loop, ntoken, toklen, sec_ix;
int ret;

_enter(",{%x,%x,%x,%x},%zu",
@@ -576,22 +580,21 @@ static int rxrpc_instantiate_xdr(struct key *key, const void *data, size_t datal
if (len < 1 || len > AFSTOKEN_CELL_MAX)
goto not_xdr;
datalen -= 4;
- tmp = (len + 3) & ~3;
- if (tmp > datalen)
+ paddedlen = (len + 3) & ~3;
+ if (paddedlen > datalen)
goto not_xdr;

cp = (const char *) xdr;
for (loop = 0; loop < len; loop++)
if (!isprint(cp[loop]))
goto not_xdr;
- if (len < tmp)
- for (; loop < tmp; loop++)
- if (cp[loop])
- goto not_xdr;
+ for (; loop < paddedlen; loop++)
+ if (cp[loop])
+ goto not_xdr;
_debug("cellname: [%u/%u] '%*.*s'",
- len, tmp, len, len, (const char *) xdr);
- datalen -= tmp;
- xdr += tmp >> 2;
+ len, paddedlen, len, len, (const char *) xdr);
+ datalen -= paddedlen;
+ xdr += paddedlen >> 2;

/* get the token count */
if (datalen < 12)
@@ -612,10 +615,11 @@ static int rxrpc_instantiate_xdr(struct key *key, const void *data, size_t datal
sec_ix = ntohl(*xdr);
datalen -= 4;
_debug("token: [%x/%zx] %x", toklen, datalen, sec_ix);
- if (toklen < 20 || toklen > datalen)
+ paddedlen = (toklen + 3) & ~3;
+ if (toklen < 20 || toklen > datalen || paddedlen > datalen)
goto not_xdr;
- datalen -= (toklen + 3) & ~3;
- xdr += (toklen + 3) >> 2;
+ datalen -= paddedlen;
+ xdr += paddedlen >> 2;

} while (--loop > 0);
[unhandled content-type:application/pgp-signature]
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