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authorJohannes Heimansberg <git@jhe.dedyn.io>2020-09-06 09:22:50 +0200
committerWilliam Hubbs <w.d.hubbs@gmail.com>2020-11-27 16:40:12 -0600
commit47819f004cec3cc3e911ba69003b8b52bacbebef (patch)
treedc706fbb6f4bf1695267e7ec2cea8cff1daee100 /agetty-guide.md
parent0fab3e837b45021fdcc02a71873c3c245ce96080 (diff)
start-stop-daemon, supervise-daemon: fix parsing of usernames passed via --user that start with a number
start-stop-daemon and supervise-daemon parse usernames and group names passed via the --user argument as numeric UID/GID if they start with a number (e.g. user "4foo" will be treated as UID 4). This results in the process that is being started to run under a totally unexpected user if that UID exists. Even though the result of the sscanf calls are tested for a result of exactly 1, which means exactly one value was extracted, because sscanf's format string only contains only one placeholder, it will never return a value greater than 1, even if there are still characters left to be parsed. This causes start-stop-daemon and supervise-daemon to assume that usernames starting with a number are just that number. Adding a second placeholder "%1s" to the format string, which matches a string of length 1, makes sure that sscanf can distinguish between pure numbers (in which case it will return 1) and strings either starting with a number (in which case it will return 2) and any other string (in which case it will return 0). This fixes #379. This fixes #380.
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