The patch titled
Subject: mm: use long type for page counts in mm_populate() and get_user_pages()
has been added to the -mm tree. Its filename is
mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Michel Lespinasse <walken@xxxxxxxxxx>
Subject: mm: use long type for page counts in mm_populate() and get_user_pages()
Use long type for page counts in mm_populate() so as to avoid integer
overflow when running the following test code:
int main(void) {
void *p = mmap(NULL, 0x100000000000, PROT_READ,
MAP_PRIVATE | MAP_ANON, -1, 0);
printf("p: %p\n", p);
mlockall(MCL_CURRENT);
printf("done\n");
return 0;
}
Signed-off-by: Michel Lespinasse <walken@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/hugetlb.h | 6 +++---
include/linux/mm.h | 14 +++++++-------
mm/hugetlb.c | 10 +++++-----
mm/memory.c | 14 +++++++-------
mm/mlock.c | 5 +++--
5 files changed, 25 insertions(+), 24 deletions(-)
diff -puN include/linux/hugetlb.h~mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages include/linux/hugetlb.h
--- a/include/linux/hugetlb.h~mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages
+++ a/include/linux/hugetlb.h
@@ -43,9 +43,9 @@ int hugetlb_mempolicy_sysctl_handler(str
#endif
int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
-int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
- struct page **, struct vm_area_struct **,
- unsigned long *, int *, int, unsigned int flags);
+long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
+ struct page **, struct vm_area_struct **,
+ unsigned long *, long *, long, unsigned int flags);
void unmap_hugepage_range(struct vm_area_struct *,
unsigned long, unsigned long, struct page *);
void __unmap_hugepage_range_final(struct mmu_gather *tlb,
diff -puN include/linux/mm.h~mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages include/linux/mm.h
--- a/include/linux/mm.h~mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages
+++ a/include/linux/mm.h
@@ -1009,13 +1009,13 @@ extern int access_process_vm(struct task
extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
void *buf, int len, int write);
-int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long start, int len, unsigned int foll_flags,
- struct page **pages, struct vm_area_struct **vmas,
- int *nonblocking);
-int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long start, int nr_pages, int write, int force,
- struct page **pages, struct vm_area_struct **vmas);
+long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
+ unsigned long start, long len, unsigned int foll_flags,
+ struct page **pages, struct vm_area_struct **vmas,
+ int *nonblocking);
+long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
+ unsigned long start, long nr_pages, int write, int force,
+ struct page **pages, struct vm_area_struct **vmas);
int get_user_pages_fast(unsigned long start, int nr_pages, int write,
struct page **pages);
struct kvec;
diff -puN mm/hugetlb.c~mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages mm/hugetlb.c
--- a/mm/hugetlb.c~mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages
+++ a/mm/hugetlb.c
@@ -2920,14 +2920,14 @@ follow_huge_pud(struct mm_struct *mm, un
return NULL;
}
-int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
- struct page **pages, struct vm_area_struct **vmas,
- unsigned long *position, int *length, int i,
- unsigned int flags)
+long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
+ struct page **pages, struct vm_area_struct **vmas,
+ unsigned long *position, long *length, long i,
+ unsigned int flags)
{
unsigned long pfn_offset;
unsigned long vaddr = *position;
- int remainder = *length;
+ long remainder = *length;
struct hstate *h = hstate_vma(vma);
spin_lock(&mm->page_table_lock);
diff -puN mm/memory.c~mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages mm/memory.c
--- a/mm/memory.c~mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages
+++ a/mm/memory.c
@@ -1677,12 +1677,12 @@ static inline int stack_guard_page(struc
* instead of __get_user_pages. __get_user_pages should be used only if
* you need some special @gup_flags.
*/
-int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long start, int nr_pages, unsigned int gup_flags,
- struct page **pages, struct vm_area_struct **vmas,
- int *nonblocking)
+long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
+ unsigned long start, long nr_pages, unsigned int gup_flags,
+ struct page **pages, struct vm_area_struct **vmas,
+ int *nonblocking)
{
- int i;
+ long i;
unsigned long vm_flags;
if (nr_pages <= 0)
@@ -1981,8 +1981,8 @@ int fixup_user_fault(struct task_struct
*
* See also get_user_pages_fast, for performance critical applications.
*/
-int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long start, int nr_pages, int write, int force,
+long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
+ unsigned long start, long nr_pages, int write, int force,
struct page **pages, struct vm_area_struct **vmas)
{
int flags = FOLL_TOUCH;
diff -puN mm/mlock.c~mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages mm/mlock.c
--- a/mm/mlock.c~mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages
+++ a/mm/mlock.c
@@ -160,7 +160,7 @@ long __mlock_vma_pages_range(struct vm_a
{
struct mm_struct *mm = vma->vm_mm;
unsigned long addr = start;
- int nr_pages = (end - start) / PAGE_SIZE;
+ long nr_pages = (end - start) / PAGE_SIZE;
int gup_flags;
VM_BUG_ON(start & ~PAGE_MASK);
@@ -378,7 +378,7 @@ int __mm_populate(unsigned long start, u
unsigned long end, nstart, nend;
struct vm_area_struct *vma = NULL;
int locked = 0;
- int ret = 0;
+ long ret = 0;
VM_BUG_ON(start & ~PAGE_MASK);
VM_BUG_ON(len != PAGE_ALIGN(len));
@@ -421,6 +421,7 @@ int __mm_populate(unsigned long start, u
ret = __mlock_posix_error_return(ret);
break;
}
+ VM_BUG_ON(!ret);
nend = nstart + ret * PAGE_SIZE;
ret = 0;
}
_
Patches currently in -mm which might be from walken@xxxxxxxxxx are
thp-avoid-dumping-huge-zero-page.patch
linux-next.patch
mm-make-mlockall-preserve-flags-other-than-vm_locked-in-def_flags.patch
mm-remap_file_pages-fixes.patch
mm-introduce-mm_populate-for-populating-new-vmas.patch
mm-use-mm_populate-for-blocking-remap_file_pages.patch
mm-use-mm_populate-when-adjusting-brk-with-mcl_future-in-effect.patch
mm-use-mm_populate-for-mremap-of-vm_locked-vmas.patch
mm-remove-flags-argument-to-mmap_region.patch
mm-remove-flags-argument-to-mmap_region-fix.patch
mm-directly-use-__mlock_vma_pages_range-in-find_extend_vma.patch
mm-introduce-vm_populate-flag-to-better-deal-with-racy-userspace-programs.patch
mm-make-do_mmap_pgoff-return-populate-as-a-size-in-bytes-not-as-a-bool.patch
mm-use-long-type-for-page-counts-in-mm_populate-and-get_user_pages.patch
mtd-mtd_nandecctest-use-prandom_bytes-instead-of-get_random_bytes.patch
mtd-mtd_oobtest-convert-to-use-prandom-library.patch
mtd-mtd_pagetest-convert-to-use-prandom-library.patch
mtd-mtd_speedtest-use-prandom_bytes.patch
mtd-mtd_subpagetest-convert-to-use-prandom-library.patch
mtd-mtd_stresstest-use-prandom_bytes.patch
mutex-subsystem-synchro-test-module.patch
--
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