diff options
| author |   Oleg Nesterov <oleg@redhat.com> | 2012-07-29 20:22:33 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2012-07-30 11:27:21 +0200 |
| commit | aefd8933d445abf7ff0d4027c624737898827bcd (patch) | |
| tree | f32864bfa64158141326ac35bc57204e49b2774f /kernel | |
| parent | uprobes: Suppress uprobe_munmap() from mmput() (diff) | |
| download | linux-dev-aefd8933d445abf7ff0d4027c624737898827bcd.tar.xz linux-dev-aefd8933d445abf7ff0d4027c624737898827bcd.zip | |
uprobes: Fix overflow in vma_address()/find_active_uprobe()
vma->vm_pgoff is "unsigned long", it should be promoted to
loff_t before the multiplication to avoid the overflow.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar.vnet.ibm.com>
Cc: Anton Arapov <anton@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20120729182233.GA20339@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/uprobes.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 9db9cdf8ff34..fb961d5e205c 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -117,7 +117,7 @@ static loff_t vma_address(struct vm_area_struct *vma, loff_t offset) loff_t vaddr; vaddr = vma->vm_start + offset; - vaddr -= vma->vm_pgoff << PAGE_SHIFT; + vaddr -= (loff_t)vma->vm_pgoff << PAGE_SHIFT; return vaddr; } @@ -1450,7 +1450,7 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp) inode = vma->vm_file->f_mapping->host; offset = bp_vaddr - vma->vm_start; - offset += (vma->vm_pgoff << PAGE_SHIFT); + offset += (loff_t)vma->vm_pgoff << PAGE_SHIFT; uprobe = find_uprobe(inode, offset); } |