Miles, the GCC developers don't consider this to be a bug, and so I
doubt that any of it will be "fixed". For example, here is a "bug"
cited in the paper:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30475
If you have a moment, read through that thread. It gets pretty testy
as the developers argue over whether or not it's a bug. Eventually it
was closed as "invalid', i.e. not really a true bug. It's not just
GCC, either. Take a look at this series of blog posts by the LLVM team:
http://blog.llvm.org/2011/05/what-every-c-programmer-should-know.html
Compiler developers, for better or worse, reserve the right to do
whatever they want with undefined behavior, and it's up to the person
writing the C code to not include undefined behavior in their own program.
Therefore, a Linux distribution has 2 choices: (1) wait for upstream
patches for bugs/vulnerabilities as they are found, or (2) recompile
all packages with optimizations disabled. I don't think proposal #2
would get very far...
On Tue, Nov 26, 2013 at 1:54 PM, Miles Fidelman
<mfidelman@meetinghouse.net <mailto:mfidelman@meetinghouse.net>> wrote:
Going back through the discussion on this thread, I'm taken by two
main reactions:
- discussion of the specific class of bugs/security holes
- a lot of comments that "this is an issue for upstream"
What I haven't seen, so I'll add it to the discussion, is that
this strikes me as an issue for "WAY upstream" - i.e., if gcc's
optimizer is opening a class of security holes - then it's gcc
that has to be fixed, after which that class of holes would go
away after the next build of any impacted package.
Miles Fidelman
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