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Ryan Houdek
28cc179214
In preparation for seccomp execve inheritance. We are going to need to add a new environment variable earlier in the execve sequence to handle inheritance in the case of binfmt_misc. No functional change in regards to envp handling. Minor change around execveat with FD without binfmt_misc. In the case that execveat returned an error and we did a `dup` of the FD then we would have an FD leak. Make sure to close the duplicated FD in that instance.