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authorJohannes Berg <johannes.berg@intel.com>2018-09-27 11:28:35 +0200
committerDavid S. Miller <davem@davemloft.net>2018-10-01 23:05:31 -0700
commit3e48be05f3c7eb6f6126939e9d957903c5cfeee5 (patch)
tree866035464b1e44661e6ac5459f80db6580364a93 /include/media/cec.h
parent6140cc20caf7da861fb113a707e0acc36bd358ec (diff)
netlink: add attribute range validation to policy
Without further bloating the policy structs, we can overload the `validation_data' pointer with a struct of s16 min, max and use those to validate ranges in NLA_{U,S}{8,16,32,64} attributes. It may sound strange to validate NLA_U32 with a s16 max, but in many cases NLA_U32 is used for enums etc. since there's no size benefit in using a smaller attribute width anyway, due to netlink attribute alignment; in cases like that it's still useful, particularly when the attribute really transports an enum value. Doing so lets us remove quite a bit of validation code, if we can be sure that these attributes aren't used by userspace in places where they're ignored today. To achieve all this, split the 'type' field and introduce a new 'validation_type' field which indicates what further validation (beyond the validation prescribed by the type of the attribute) is done. This currently allows for no further validation (the default), as well as min, max and range checks. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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