Fix CVE-2020-14382: A vulnerability was found in upstream release
cryptsetup-2.2.0 where, there's a bug in LUKS2 format validation code,
that is effectively invoked on every device/image presenting itself as
LUKS2 container. The bug is in segments validation code in file
'lib/luks2/luks2_json_metadata.c' in function
hdr_validate_segments(struct crypt_device *cd, json_object *hdr_jobj)
where the code does not check for possible overflow on memory allocation
used for intervals array (see statement "intervals = malloc(first_backup
* sizeof(*intervals));"). Due to the bug, library can be *tricked* to
expect such allocation was successful but for far less memory then
originally expected. Later it may read data FROM image crafted by an
attacker and actually write such data BEYOND allocated memory.
https://mirrors.edge.kernel.org/pub/linux/utils/cryptsetup/v2.3/v2.3.4-ReleaseNotes
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
baa28856f1