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There are places where an object "child" has a raw pointer
back to object "owner" with the understanding that owner will
always outlive child.
Violating this constraint can lead to use after free, but this
requires finding two paths: one that frees the objects in the
wrong order, and one that uses the object after the free. The
purpose of this patch is to detect the constraint violation
even when the second path is not hit.
We create a template that is used in place of TYPE*. It's dtor,
when a memory tool is present, goes out and probes the first
byte of the object to which it points. Used in "child", this
allows the memory tool to prove that the "owner" is still alive
at the time the child is destroyed, and hence the constraint is
never violated.
Change-Id: I2a6d696d51dda4a79ee2f00a6752965e058a6417
Reviewed-on: https://pdfium-review.googlesource.com/5475
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
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This reverts commit f0d5b6c35fa343108a3ab7a25bc2cc2b3cf105b3.
Review-Url: https://codereview.chromium.org/2478303002
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#11 id:200001 of https://codereview.chromium.org/2384883003/ )
Reason for revert:
Looks like it's blocking the roll.
https://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_compile_dbg_ng/builds/186619
Original issue's description:
> Remove CPDF_Object::Release() in favor of direct delete
>
> Follow-on once we prove Release always deletes in previous CL.
>
> Committed: https://pdfium.googlesource.com/pdfium/+/4de3d095c9d9e961f93750cf1ebd489fd515be12
TBR=thestig@chromium.org,tsepez@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Review-Url: https://codereview.chromium.org/2478253002
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Follow-on once we prove Release always deletes in previous CL.
Review-Url: https://codereview.chromium.org/2384883003
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Review-Url: https://codereview.chromium.org/2477443002
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BUG=pdfium:603
Review-Url: https://codereview.chromium.org/2386423004
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