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| author | Michel Lespinasse <walken@google.com> | 2013-02-23 01:35:55 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-24 02:50:22 +0100 |
| commit | 28a35716d317980ae9bc2ff2f84c33a3cda9e884 (patch) | |
| tree | a69307192d34334c6869cfe33b6fea4e358de718 /mm/nommu.c | |
| parent | mm: accurately document nr_free_*_pages functions with code comments (diff) | |
| download | linux-28a35716d317980ae9bc2ff2f84c33a3cda9e884.tar.xz linux-28a35716d317980ae9bc2ff2f84c33a3cda9e884.zip | |
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@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/nommu.c')
| -rw-r--r-- | mm/nommu.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index 87854a55829d..6ab706608492 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -140,10 +140,10 @@ unsigned int kobjsize(const void *objp) return PAGE_SIZE << compound_order(page); } -int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, - unsigned long start, int nr_pages, unsigned int foll_flags, - struct page **pages, struct vm_area_struct **vmas, - int *retry) +long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, + unsigned long start, unsigned long nr_pages, + unsigned int foll_flags, struct page **pages, + struct vm_area_struct **vmas, int *nonblocking) { struct vm_area_struct *vma; unsigned long vm_flags; @@ -190,9 +190,10 @@ finish_or_fault: * slab page or a secondary page from a compound page * - don't permit access to VMAs that don't support it, such as I/O mappings */ -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, unsigned long nr_pages, + int write, int force, struct page **pages, + struct vm_area_struct **vmas) { int flags = 0; |