summaryrefslogtreecommitdiffstats
path: root/mm/mmap.c
diff options
context:
space:
mode:
authorMichel Lespinasse <walken@google.com>2013-02-23 01:32:47 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-24 02:50:11 +0100
commit41badc15cbad0350de34408c1b0c690f9df76d4b (patch)
tree2545134398b99b37259bf6412a0bb56442f120fa /mm/mmap.c
parentmm: introduce VM_POPULATE flag to better deal with racy userspace programs (diff)
downloadlinux-41badc15cbad0350de34408c1b0c690f9df76d4b.tar.xz
linux-41badc15cbad0350de34408c1b0c690f9df76d4b.zip
mm: make do_mmap_pgoff return populate as a size in bytes, not as a bool
do_mmap_pgoff() rounds up the desired size to the next PAGE_SIZE multiple, however there was no equivalent code in mm_populate(), which caused issues. This could be fixed by introduced the same rounding in mm_populate(), however I think it's preferable to make do_mmap_pgoff() return populate as a size rather than as a boolean, so we don't have to duplicate the size rounding logic in mm_populate(). Signed-off-by: Michel Lespinasse <walken@google.com> Acked-by: Rik van Riel <riel@redhat.com> Tested-by: Andy Lutomirski <luto@amacapital.net> Cc: Greg Ungerer <gregungerer@westnet.com.au> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 39a3944e1658..44bb4d869884 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1163,13 +1163,13 @@ static inline unsigned long round_hint_to_min(unsigned long hint)
unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
unsigned long flags, unsigned long pgoff,
- bool *populate)
+ unsigned long *populate)
{
struct mm_struct * mm = current->mm;
struct inode *inode;
vm_flags_t vm_flags;
- *populate = false;
+ *populate = 0;
/*
* Does the application expect PROT_READ to imply PROT_EXEC?
@@ -1307,7 +1307,7 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
addr = mmap_region(file, addr, len, vm_flags, pgoff);
if (!IS_ERR_VALUE(addr) && (vm_flags & VM_POPULATE))
- *populate = true;
+ *populate = len;
return addr;
}