sudo -- Multiple vulnerabilities

Todd C. Miller reports:

When invoked as sudoedit, the same set of command line options
are now accepted as for sudo -e. The -H and -P options are now
rejected for sudoedit and sudo -e which matches the sudo 1.7
behavior. This is part of the fix for CVE-2021-3156.
Fixed a potential buffer overflow when unescaping backslashes in
the command’s arguments. Normally, sudo escapes special characters
when running a command via a shell (sudo -s or sudo -i). However,
it was also possible to run sudoedit with the -s or -i flags in
which case no escaping had actually been done, making a buffer
overflow possible. This fixes CVE-2021-3156.