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NFC: add necessary privilege flags in netlink layer 

The CAP_NET_ADMIN checks are needed to prevent attackers faking a
device under NCIUARTSETDRIVER and exploit privileged commands.

This patch add GENL_ADMIN_PERM flags in genl_ops to fulfill the check.
Except for commands like NFC_CMD_GET_DEVICE, NFC_CMD_GET_TARGET,
NFC_CMD_LLC_GET_PARAMS, and NFC_CMD_GET_SE, which are mainly information-
read operations.

Signed-off-by: Lin Ma <linma@zju.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lin Ma 2021-11-02 16:10:21 +08:00 committed by David S. Miller
parent 2bd080b096
commit aedddb4e45
1 changed files with 15 additions and 0 deletions
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15
net/nfc/netlink.c
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@ -1664,31 +1664,37 @@ static const struct genl_ops nfc_genl_ops[] = {
.cmd = NFC_CMD_DEV_UP,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_dev_up,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_DEV_DOWN,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_dev_down,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_START_POLL,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_start_poll,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_STOP_POLL,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_stop_poll,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_DEP_LINK_UP,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_dep_link_up,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_DEP_LINK_DOWN,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_dep_link_down,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_GET_TARGET,
@ -1706,26 +1712,31 @@ static const struct genl_ops nfc_genl_ops[] = {
.cmd = NFC_CMD_LLC_SET_PARAMS,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_llc_set_params,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_LLC_SDREQ,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_llc_sdreq,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_FW_DOWNLOAD,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_fw_download,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_ENABLE_SE,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_enable_se,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_DISABLE_SE,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_disable_se,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_GET_SE,
@ -1737,21 +1748,25 @@ static const struct genl_ops nfc_genl_ops[] = {
.cmd = NFC_CMD_SE_IO,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_se_io,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_ACTIVATE_TARGET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_activate_target,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_VENDOR,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_vendor_cmd,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NFC_CMD_DEACTIVATE_TARGET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = nfc_genl_deactivate_target,
.flags = GENL_ADMIN_PERM,
},
};