提交 aefd8933 编写于 作者: O Oleg Nesterov 提交者: Ingo Molnar

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: NOleg 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.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
上级 2fd611a9
......@@ -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);
}
......
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