Andreas Kling fc5ebe2a50 Kernel: Disown shared buffers on sys$execve() ...

When committing to a new executable, disown any shared buffers that the
process was previously co-owning.

Otherwise accessing the same shared buffer ID from the new program
would cause the kernel to find a cached (and stale!) reference to the
previous program's VM region corresponding to that shared buffer,
leading to a Region* use-after-free.

Fixes #1270.

2020-02-22 12:29:38 +01:00

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