Comment #3 on issue 348 by [email protected]: asan does not always
detect access beyond mmaped page
https://code.google.com/p/address-sanitizer/issues/detail?id=348
Can you print the page addresses to make sure the second access doesn't
fall into the first page (or any other mapped page)?
Regarding the mmap() interceptor, I think this is a half-measure that won't
help, for example, when mmap() is called from libc() via a local call, or
when the raw syscall is invoked.
IMO the best thing to do is to intectept __NR_mmap (together with other
syscalls) using seccomp-bpf.
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