executor: protect kcov mapping with redzones
ramosian-glider opened this issue · comments
As shown in #4531, incorrect assumptions about userspace buffers' sizes may lead the kernel to write outside of the expected bounds of certain mmap() ranges.
When the mapped memory is located next to the kcov mapping, the latter can be easily corrupted. To avoid that, we need to allocate protected redzones around the kcov mapping.