+++ /dev/null
-From 75349cc7326dd2aa645bf21fe65a40c68b386c29 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Jan-Simon=20M=C3=B6ller?= <jsmoeller@linuxfoundation.org>
-Date: Wed, 28 Jun 2017 00:35:18 +0200
-Subject: [PATCH] [SEC][Backport] Fix CVE-2017-1000364 through backport
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Fix CVE-2017-1000364 through backport of upstream patches (from 4.9 branch):
-- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.9.y&id=cfc0eb403816c5c4f9667d959de5e22789b5421e
-- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.9.y&id=5d10ad6297260e9b85e7645ee544a6115bb229e4
-- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.9.y&id=ce7fe8595902c3f03ef528c2dc1928b3f4b67fcf
-
-Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
----
- Documentation/kernel-parameters.txt | 7 ++
- arch/arc/mm/mmap.c | 2 +-
- arch/arm/mm/mmap.c | 4 +-
- arch/frv/mm/elf-fdpic.c | 2 +-
- arch/mips/mm/mmap.c | 2 +-
- arch/parisc/kernel/sys_parisc.c | 15 ++--
- arch/powerpc/mm/hugetlbpage-radix.c | 2 +-
- arch/powerpc/mm/mmap.c | 4 +-
- arch/powerpc/mm/slice.c | 2 +-
- arch/s390/mm/mmap.c | 4 +-
- arch/sh/mm/mmap.c | 4 +-
- arch/sparc/kernel/sys_sparc_64.c | 4 +-
- arch/sparc/mm/hugetlbpage.c | 2 +-
- arch/tile/mm/hugetlbpage.c | 2 +-
- arch/x86/kernel/sys_x86_64.c | 4 +-
- arch/x86/mm/hugetlbpage.c | 2 +-
- arch/xtensa/kernel/syscall.c | 2 +-
- fs/hugetlbfs/inode.c | 2 +-
- fs/proc/task_mmu.c | 4 -
- include/linux/mm.h | 53 ++++++------
- mm/gup.c | 5 --
- mm/memory.c | 38 ---------
- mm/mmap.c | 158 ++++++++++++++++++++++--------------
- 23 files changed, 159 insertions(+), 165 deletions(-)
-
-diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
-index 46726d4899fe..c1980b5c6a15 100644
---- a/Documentation/kernel-parameters.txt
-+++ b/Documentation/kernel-parameters.txt
-@@ -3852,6 +3852,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
- spia_pedr=
- spia_peddr=
-
-+ stack_guard_gap= [MM]
-+ override the default stack gap protection. The value
-+ is in page units and it defines how many pages prior
-+ to (for stacks growing down) resp. after (for stacks
-+ growing up) the main stack are reserved for no other
-+ mapping. Default value is 256 pages.
-+
- stacktrace [FTRACE]
- Enabled the stack tracer on boot up.
-
-diff --git a/arch/arc/mm/mmap.c b/arch/arc/mm/mmap.c
-index 2e06d56e987b..cf4ae6958240 100644
---- a/arch/arc/mm/mmap.c
-+++ b/arch/arc/mm/mmap.c
-@@ -64,7 +64,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
-
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
-index 66353caa35b9..641334ebf46d 100644
---- a/arch/arm/mm/mmap.c
-+++ b/arch/arm/mm/mmap.c
-@@ -89,7 +89,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
-
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-@@ -140,7 +140,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
- addr = PAGE_ALIGN(addr);
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-diff --git a/arch/frv/mm/elf-fdpic.c b/arch/frv/mm/elf-fdpic.c
-index 836f14707a62..efa59f1f8022 100644
---- a/arch/frv/mm/elf-fdpic.c
-+++ b/arch/frv/mm/elf-fdpic.c
-@@ -74,7 +74,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
- addr = PAGE_ALIGN(addr);
- vma = find_vma(current->mm, addr);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- goto success;
- }
-
-diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c
-index 353037699512..c5fdea5debe5 100644
---- a/arch/mips/mm/mmap.c
-+++ b/arch/mips/mm/mmap.c
-@@ -92,7 +92,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
-
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
-index 0a393a04e891..1d7691fa8ab2 100644
---- a/arch/parisc/kernel/sys_parisc.c
-+++ b/arch/parisc/kernel/sys_parisc.c
-@@ -88,7 +88,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
- unsigned long len, unsigned long pgoff, unsigned long flags)
- {
- struct mm_struct *mm = current->mm;
-- struct vm_area_struct *vma;
-+ struct vm_area_struct *vma, *prev;
- unsigned long task_size = TASK_SIZE;
- int do_color_align, last_mmap;
- struct vm_unmapped_area_info info;
-@@ -115,9 +115,10 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
- else
- addr = PAGE_ALIGN(addr);
-
-- vma = find_vma(mm, addr);
-+ vma = find_vma_prev(mm, addr, &prev);
- if (task_size - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)) &&
-+ (!prev || addr >= vm_end_gap(prev)))
- goto found_addr;
- }
-
-@@ -141,7 +142,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
- const unsigned long len, const unsigned long pgoff,
- const unsigned long flags)
- {
-- struct vm_area_struct *vma;
-+ struct vm_area_struct *vma, *prev;
- struct mm_struct *mm = current->mm;
- unsigned long addr = addr0;
- int do_color_align, last_mmap;
-@@ -175,9 +176,11 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
- addr = COLOR_ALIGN(addr, last_mmap, pgoff);
- else
- addr = PAGE_ALIGN(addr);
-- vma = find_vma(mm, addr);
-+
-+ vma = find_vma_prev(mm, addr, &prev);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)) &&
-+ (!prev || addr >= vm_end_gap(prev)))
- goto found_addr;
- }
-
-diff --git a/arch/powerpc/mm/hugetlbpage-radix.c b/arch/powerpc/mm/hugetlbpage-radix.c
-index 35254a678456..a2b2d97f7eda 100644
---- a/arch/powerpc/mm/hugetlbpage-radix.c
-+++ b/arch/powerpc/mm/hugetlbpage-radix.c
-@@ -65,7 +65,7 @@ radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
- addr = ALIGN(addr, huge_page_size(h));
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
- /*
-diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c
-index 2f1e44362198..5bc2845cddf4 100644
---- a/arch/powerpc/mm/mmap.c
-+++ b/arch/powerpc/mm/mmap.c
-@@ -106,7 +106,7 @@ radix__arch_get_unmapped_area(struct file *filp, unsigned long addr,
- addr = PAGE_ALIGN(addr);
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-@@ -142,7 +142,7 @@ radix__arch_get_unmapped_area_topdown(struct file *filp,
- addr = PAGE_ALIGN(addr);
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
-index 2b27458902ee..c4d5c9c61e0f 100644
---- a/arch/powerpc/mm/slice.c
-+++ b/arch/powerpc/mm/slice.c
-@@ -105,7 +105,7 @@ static int slice_area_is_free(struct mm_struct *mm, unsigned long addr,
- if ((mm->task_size - len) < addr)
- return 0;
- vma = find_vma(mm, addr);
-- return (!vma || (addr + len) <= vma->vm_start);
-+ return (!vma || (addr + len) <= vm_start_gap(vma));
- }
-
- static int slice_low_has_vma(struct mm_struct *mm, unsigned long slice)
-diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
-index eb9df2822da1..812368f274c9 100644
---- a/arch/s390/mm/mmap.c
-+++ b/arch/s390/mm/mmap.c
-@@ -98,7 +98,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
- addr = PAGE_ALIGN(addr);
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-@@ -136,7 +136,7 @@ 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 && addr >= mmap_min_addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c
-index 6777177807c2..7df7d5944188 100644
---- a/arch/sh/mm/mmap.c
-+++ b/arch/sh/mm/mmap.c
-@@ -63,7 +63,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
-
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-@@ -113,7 +113,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
-
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
-index fe8b8ee8e660..02e05e221b94 100644
---- a/arch/sparc/kernel/sys_sparc_64.c
-+++ b/arch/sparc/kernel/sys_sparc_64.c
-@@ -118,7 +118,7 @@ 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;
- }
-
-@@ -181,7 +181,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
-
- vma = find_vma(mm, addr);
- if (task_size - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
-index 988acc8b1b80..58cde8d9be8a 100644
---- a/arch/sparc/mm/hugetlbpage.c
-+++ b/arch/sparc/mm/hugetlbpage.c
-@@ -116,7 +116,7 @@ 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 77ceaa343fce..67508b249ede 100644
---- a/arch/tile/mm/hugetlbpage.c
-+++ b/arch/tile/mm/hugetlbpage.c
-@@ -232,7 +232,7 @@ 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 10e0272d789a..136ad7c1ce7b 100644
---- a/arch/x86/kernel/sys_x86_64.c
-+++ b/arch/x86/kernel/sys_x86_64.c
-@@ -143,7 +143,7 @@ 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;
- }
-
-@@ -186,7 +186,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
- addr = PAGE_ALIGN(addr);
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
-index 2ae8584b44c7..fe342e8ed529 100644
---- a/arch/x86/mm/hugetlbpage.c
-+++ b/arch/x86/mm/hugetlbpage.c
-@@ -144,7 +144,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
- addr = ALIGN(addr, huge_page_size(h));
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
- if (mm->get_unmapped_area == arch_get_unmapped_area)
-diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c
-index 83cf49685373..3aaaae18417c 100644
---- a/arch/xtensa/kernel/syscall.c
-+++ b/arch/xtensa/kernel/syscall.c
-@@ -87,7 +87,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
- /* At this point: (!vmm || addr < vmm->vm_end). */
- if (TASK_SIZE - len < addr)
- return -ENOMEM;
-- if (!vmm || addr + len <= vmm->vm_start)
-+ if (!vmm || addr + len <= vm_start_gap(vmm))
- return addr;
- addr = vmm->vm_end;
- if (flags & MAP_SHARED)
-diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
-index 4ea71eba40a5..aac9114728c3 100644
---- a/fs/hugetlbfs/inode.c
-+++ b/fs/hugetlbfs/inode.c
-@@ -191,7 +191,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
- addr = ALIGN(addr, huge_page_size(h));
- vma = find_vma(mm, addr);
- if (TASK_SIZE - len >= addr &&
-- (!vma || addr + len <= vma->vm_start))
-+ (!vma || addr + len <= vm_start_gap(vma)))
- return addr;
- }
-
-diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
-index 2750949397eb..5feada822930 100644
---- a/fs/proc/task_mmu.c
-+++ b/fs/proc/task_mmu.c
-@@ -309,11 +309,7 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
-
- /* We don't show the stack guard page in /proc/maps */
- start = vma->vm_start;
-- if (stack_guard_page_start(vma, start))
-- start += PAGE_SIZE;
- end = vma->vm_end;
-- if (stack_guard_page_end(vma, end))
-- end -= PAGE_SIZE;
-
- seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
- seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
-diff --git a/include/linux/mm.h b/include/linux/mm.h
-index 582d30baaa86..31206cc2e99c 100644
---- a/include/linux/mm.h
-+++ b/include/linux/mm.h
-@@ -1392,39 +1392,11 @@ int clear_page_dirty_for_io(struct page *page);
-
- int get_cmdline(struct task_struct *task, char *buffer, int buflen);
-
--/* 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 bool vma_is_anonymous(struct vm_area_struct *vma)
- {
- return !vma->vm_ops;
- }
-
--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);
--}
--
- int vma_is_stack_for_task(struct vm_area_struct *vma, struct task_struct *t);
-
- extern unsigned long move_page_tables(struct vm_area_struct *vma,
-@@ -2153,6 +2125,7 @@ void page_cache_async_readahead(struct address_space *mapping,
- pgoff_t offset,
- unsigned long size);
-
-+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);
-
-@@ -2181,6 +2154,30 @@ 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/gup.c b/mm/gup.c
-index 22cc22e7432f..4b3723734623 100644
---- a/mm/gup.c
-+++ b/mm/gup.c
-@@ -370,11 +370,6 @@ static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma,
- /* mlock all present pages, but do not fault in new pages */
- if ((*flags & (FOLL_POPULATE | FOLL_MLOCK)) == FOLL_MLOCK)
- return -ENOENT;
-- /* For mm_populate(), just skip the stack guard page. */
-- if ((*flags & FOLL_POPULATE) &&
-- (stack_guard_page_start(vma, address) ||
-- stack_guard_page_end(vma, address + PAGE_SIZE)))
-- return -ENOENT;
- if (*flags & FOLL_WRITE)
- fault_flags |= FAULT_FLAG_WRITE;
- if (*flags & FOLL_REMOTE)
-diff --git a/mm/memory.c b/mm/memory.c
-index 45f39f391cc2..527ef7841146 100644
---- a/mm/memory.c
-+++ b/mm/memory.c
-@@ -2695,40 +2695,6 @@ 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.
-@@ -2744,10 +2710,6 @@ static int do_anonymous_page(struct fault_env *fe)
- 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, fe->address) < 0)
-- return VM_FAULT_SIGSEGV;
--
- /*
- * Use pte_alloc() instead of pte_alloc_map(). We can't run
- * pte_offset_map() on pmds where a huge pmd might be created
-diff --git a/mm/mmap.c b/mm/mmap.c
-index f3ebc5a54367..e1c1eb4b3942 100644
---- a/mm/mmap.c
-+++ b/mm/mmap.c
-@@ -176,6 +176,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
- unsigned long retval;
- unsigned long newbrk, oldbrk;
- struct mm_struct *mm = current->mm;
-+ struct vm_area_struct *next;
- unsigned long min_brk;
- bool populate;
-
-@@ -221,7 +222,8 @@ 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. */
-@@ -244,10 +246,22 @@ out:
-
- static long vma_compute_subtree_gap(struct vm_area_struct *vma)
- {
-- unsigned long max, subtree_gap;
-- max = vma->vm_start;
-- if (vma->vm_prev)
-- max -= vma->vm_prev->vm_end;
-+ unsigned long max, prev_end, subtree_gap;
-+
-+ /*
-+ * Note: in the rare case of a VM_GROWSDOWN above a VM_GROWSUP, we
-+ * allow two stack_guard_gaps between them here, and when choosing
-+ * an unmapped area; whereas when expanding we only require one.
-+ * That's a little inconsistent, but keeps the code here simpler.
-+ */
-+ max = vm_start_gap(vma);
-+ if (vma->vm_prev) {
-+ prev_end = vm_end_gap(vma->vm_prev);
-+ if (max > prev_end)
-+ max -= prev_end;
-+ else
-+ max = 0;
-+ }
- if (vma->vm_rb.rb_left) {
- subtree_gap = rb_entry(vma->vm_rb.rb_left,
- struct vm_area_struct, vm_rb)->rb_subtree_gap;
-@@ -343,7 +357,7 @@ static void validate_mm(struct mm_struct *mm)
- anon_vma_unlock_read(anon_vma);
- }
-
-- highest_address = vma->vm_end;
-+ highest_address = vm_end_gap(vma);
- vma = vma->vm_next;
- i++;
- }
-@@ -512,7 +526,7 @@ void __vma_link_rb(struct mm_struct *mm, struct vm_area_struct *vma,
- if (vma->vm_next)
- vma_gap_update(vma->vm_next);
- else
-- mm->highest_vm_end = vma->vm_end;
-+ mm->highest_vm_end = vm_end_gap(vma);
-
- /*
- * vma->vm_prev wasn't known when we followed the rbtree to find the
-@@ -765,7 +779,7 @@ again:
- vma_gap_update(vma);
- if (end_changed) {
- if (!next)
-- mm->highest_vm_end = end;
-+ mm->highest_vm_end = vm_end_gap(vma);
- else if (!adjust_next)
- vma_gap_update(next);
- }
-@@ -1630,7 +1644,7 @@ unsigned long unmapped_area(struct vm_unmapped_area_info *info)
-
- while (true) {
- /* Visit left subtree if it looks promising */
-- gap_end = vma->vm_start;
-+ gap_end = vm_start_gap(vma);
- if (gap_end >= low_limit && vma->vm_rb.rb_left) {
- struct vm_area_struct *left =
- rb_entry(vma->vm_rb.rb_left,
-@@ -1641,12 +1655,13 @@ unsigned long unmapped_area(struct vm_unmapped_area_info *info)
- }
- }
-
-- gap_start = vma->vm_prev ? vma->vm_prev->vm_end : 0;
-+ gap_start = vma->vm_prev ? vm_end_gap(vma->vm_prev) : 0;
- check_current:
- /* Check if current node has a suitable gap */
- if (gap_start > high_limit)
- return -ENOMEM;
-- if (gap_end >= low_limit && gap_end - gap_start >= length)
-+ if (gap_end >= low_limit &&
-+ gap_end > gap_start && gap_end - gap_start >= length)
- goto found;
-
- /* Visit right subtree if it looks promising */
-@@ -1668,8 +1683,8 @@ check_current:
- vma = rb_entry(rb_parent(prev),
- struct vm_area_struct, vm_rb);
- if (prev == vma->vm_rb.rb_left) {
-- gap_start = vma->vm_prev->vm_end;
-- gap_end = vma->vm_start;
-+ gap_start = vm_end_gap(vma->vm_prev);
-+ gap_end = vm_start_gap(vma);
- goto check_current;
- }
- }
-@@ -1733,7 +1748,7 @@ unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info)
-
- while (true) {
- /* Visit right subtree if it looks promising */
-- gap_start = vma->vm_prev ? vma->vm_prev->vm_end : 0;
-+ gap_start = vma->vm_prev ? vm_end_gap(vma->vm_prev) : 0;
- if (gap_start <= high_limit && vma->vm_rb.rb_right) {
- struct vm_area_struct *right =
- rb_entry(vma->vm_rb.rb_right,
-@@ -1746,10 +1761,11 @@ unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info)
-
- check_current:
- /* Check if current node has a suitable gap */
-- gap_end = vma->vm_start;
-+ gap_end = vm_start_gap(vma);
- if (gap_end < low_limit)
- return -ENOMEM;
-- if (gap_start <= high_limit && gap_end - gap_start >= length)
-+ if (gap_start <= high_limit &&
-+ gap_end > gap_start && gap_end - gap_start >= length)
- goto found;
-
- /* Visit left subtree if it looks promising */
-@@ -1772,7 +1788,7 @@ check_current:
- struct vm_area_struct, vm_rb);
- if (prev == vma->vm_rb.rb_right) {
- gap_start = vma->vm_prev ?
-- vma->vm_prev->vm_end : 0;
-+ vm_end_gap(vma->vm_prev) : 0;
- goto check_current;
- }
- }
-@@ -1810,7 +1826,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
- unsigned long len, unsigned long pgoff, unsigned long flags)
- {
- struct mm_struct *mm = current->mm;
-- struct vm_area_struct *vma;
-+ struct vm_area_struct *vma, *prev;
- struct vm_unmapped_area_info info;
-
- if (len > TASK_SIZE - mmap_min_addr)
-@@ -1821,9 +1837,10 @@ 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;
- }
-
-@@ -1846,7 +1863,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
- const unsigned long len, const unsigned long pgoff,
- const unsigned long flags)
- {
-- struct vm_area_struct *vma;
-+ struct vm_area_struct *vma, *prev;
- struct mm_struct *mm = current->mm;
- unsigned long addr = addr0;
- struct vm_unmapped_area_info info;
-@@ -1861,9 +1878,10 @@ 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;
- }
-
-@@ -1998,21 +2016,19 @@ 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, vma->vm_flags, 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 > READ_ONCE(rlim[RLIMIT_STACK].rlim_cur))
-+ if (size > READ_ONCE(rlim[RLIMIT_STACK].rlim_cur))
- return -ENOMEM;
-
- /* mlock limit tests */
-@@ -2050,16 +2066,32 @@ 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)
- {
- struct mm_struct *mm = vma->vm_mm;
-+ struct vm_area_struct *next;
-+ unsigned long gap_addr;
- int error = 0;
-
- if (!(vma->vm_flags & VM_GROWSUP))
- return -EFAULT;
-
-- /* Guard against wrapping around to address 0. */
-- if (address < PAGE_ALIGN(address+4))
-- address = PAGE_ALIGN(address+4);
-- else
-+ /* 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)))
-@@ -2104,7 +2136,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
- if (vma->vm_next)
- vma_gap_update(vma->vm_next);
- else
-- mm->highest_vm_end = address;
-+ mm->highest_vm_end = vm_end_gap(vma);
- spin_unlock(&mm->page_table_lock);
-
- perf_event_mmap(vma);
-@@ -2125,6 +2157,8 @@ int expand_downwards(struct vm_area_struct *vma,
- unsigned long address)
- {
- struct mm_struct *mm = vma->vm_mm;
-+ struct vm_area_struct *prev;
-+ unsigned long gap_addr;
- int error;
-
- address &= PAGE_MASK;
-@@ -2132,6 +2166,17 @@ int expand_downwards(struct vm_area_struct *vma,
- if (error)
- return error;
-
-+ /* 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;
-@@ -2186,28 +2231,25 @@ int expand_downwards(struct vm_area_struct *vma,
- return error;
- }
-
--/*
-- * Note how expand_stack() refuses to expand the stack all the way to
-- * abut the next virtual mapping, *unless* that mapping itself is also
-- * a stack mapping. We want to leave room for a guard page, after all
-- * (the guard page itself is not added here, that is done by the
-- * actual page faulting logic)
-- *
-- * This matches the behavior of the guard page logic (see mm/memory.c:
-- * check_stack_guard_page()), which only allows the guard page to be
-- * removed under these circumstances.
-- */
-+/* enforced gap between the expanding stack and other mappings. */
-+unsigned long stack_guard_gap = 256UL<<PAGE_SHIFT;
-+
-+static int __init cmdline_parse_stack_guard_gap(char *p)
-+{
-+ unsigned long val;
-+ char *endptr;
-+
-+ val = simple_strtoul(p, &endptr, 10);
-+ if (!*endptr)
-+ stack_guard_gap = val << PAGE_SHIFT;
-+
-+ return 0;
-+}
-+__setup("stack_guard_gap=", cmdline_parse_stack_guard_gap);
-+
- #ifdef CONFIG_STACK_GROWSUP
- int expand_stack(struct vm_area_struct *vma, unsigned long address)
- {
-- struct vm_area_struct *next;
--
-- address &= PAGE_MASK;
-- next = vma->vm_next;
-- if (next && next->vm_start == address + PAGE_SIZE) {
-- if (!(next->vm_flags & VM_GROWSUP))
-- return -ENOMEM;
-- }
- return expand_upwards(vma, address);
- }
-
-@@ -2229,14 +2271,6 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
- #else
- int expand_stack(struct vm_area_struct *vma, unsigned long address)
- {
-- struct vm_area_struct *prev;
--
-- address &= PAGE_MASK;
-- prev = vma->vm_prev;
-- if (prev && prev->vm_end == address) {
-- if (!(prev->vm_flags & VM_GROWSDOWN))
-- return -ENOMEM;
-- }
- return expand_downwards(vma, address);
- }
-
-@@ -2334,7 +2368,7 @@ detach_vmas_to_be_unmapped(struct mm_struct *mm, struct vm_area_struct *vma,
- vma->vm_prev = prev;
- vma_gap_update(vma);
- } else
-- mm->highest_vm_end = prev ? prev->vm_end : 0;
-+ mm->highest_vm_end = prev ? vm_end_gap(prev) : 0;
- tail_vma->vm_next = NULL;
-
- /* Kill the cache */
---
-2.12.3
-
Code Review / AGL / meta-agl.git / commitdiff