On Thu, Mar 6, 2014 at 1:38 AM, Patrick Walton <pwal...@mozilla.com> wrote: > Optimization of null pointer dereferences has resulted in security > vulnerabilities in the Linux kernel:
That was not a case where the load was actually optimized away, only a check following the load. In standard userland as well as modern Linux (mmap_min_addr), that would crash. Responsible is debatable; I am just saying that I have never heard of it affecting a real program. (Less anecdotal evidence: -fno-delete-null-pointer-checks exists in GCC and probably has no performance effect on the vast majority of code, but I have not heard of it being recommended and it has not been implemented in Clang.) Since things like use-after-free, buffer overruns, missing locks, etc. constantly affect real programs, I wouldn't focus on it too much. _______________________________________________ Rust-dev mailing list Rust-dev@mozilla.org https://mail.mozilla.org/listinfo/rust-dev
