Messages in this thread Patch in this message | | | Date | Mon, 30 Jul 2012 07:14:57 -0700 | From | tip-bot for Oleg Nesterov <> | Subject | [tip:perf/core] uprobes: Fix overflow in vma_address()/ find_active_uprobe() |
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Commit-ID: aefd8933d445abf7ff0d4027c624737898827bcd Gitweb: http://git.kernel.org/tip/aefd8933d445abf7ff0d4027c624737898827bcd Author: Oleg Nesterov <oleg@redhat.com> AuthorDate: Sun, 29 Jul 2012 20:22:33 +0200 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Mon, 30 Jul 2012 11:27:21 +0200
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> --- 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 9db9cdf..fb961d5 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); }
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