tree f726d6199eeec0cd64efd992d7ff4168c3c5149b
parent 2a227b73e82376757297b484f79f86eabc3be52a
author Allen Webb <allenwebb@google.com> 1618584293 -0500
committer Treehugger Robot <treehugger-gerrit@google.com> 1618873946 +0000

Add overlap handling to redirect_fds().

Previously redirect_fds would clobber mapping source fds if the
destination of a previous mapping collided. This change adds detection
of these collisions and handles it by mapping them ahead of time when
possible or mapping to a temporary otherwise.

It also cleans up some badness in the Rust wrapper that was closing
file descriptors already closed by libminijail, and updates the
fork_remap test to make it easier to debug.

Bug: 185349327
Test: cargo test -- --test-threads=1
Change-Id: I637846dfbe73b73dbb5d218bcfc8464c0cd7d3b4