[tor-bugs] #17983 [Tor]: Build tor with -fwrapv by default
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Sun Jan 3 07:16:27 UTC 2016
#17983: Build tor with -fwrapv by default
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Reporter: teor | Owner:
Type: enhancement | Status: new
Priority: Medium | Milestone: Tor: 0.2.8.x-final
Component: Tor | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Sponsor: |
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Comment (by teor):
UBSan is `-fsanitize=undefined`, but it can also be used like
`-fsanitize=address,undefined`, or using the integer sanitizer only.
We could build with `-fwrapv` when `-fsanitize` does not appear on the
command-line. If they are used together, this could hide undefined
behaviour when people are explicitly checking for it. But suddenly
switching off `-fwrapv` could also cause subtle bugs.
So let's make `-fwrapv` it a ./configure option that's on by default, and
people can turn it off if they don't want it.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17983#comment:1>
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