[dm-devel] dm-crypt accepts '+' in the key
Mikulas Patocka
mpatocka at redhat.com
Sat Nov 12 20:20:54 UTC 2016
Hi
dm-crypt uses the function kstrtou8 to decode the encryption key. kstrtou8
calls kstrtoull and kstrtoull skips the first character if it is '+'.
Consequently, it is possible to load keys with '+' in it. For example,
this is possible:
dmsetup create cr --table "0 131072 crypt aes-cbc-essiv:sha256 +0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0 0 /dev/debian/tmptest 0"
Should this be fixed in dm-crypt or in kstrtou8? A fix in kstrtou8 could
be more appropriate, but we don't know how many other kernel parts depend
on this "skip plus" behavior...
Mikulas
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