5.4-stable review patch. If anyone has any objections, please let me know.
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From: Luiz Augusto von Dentz luiz.von.dentz@intel.com
[ Upstream commit fe4840df0bdf341f376885271b7680764fe6b34e ]
If a command is received while a bonding is ongoing consider it a pairing failure so the session is cleanup properly and the device is disconnected immediately instead of continuing with other commands that may result in the session to get stuck without ever completing such as the case bellow:
ACL Data RX: Handle 2048 flags 0x02 dlen 21
SMP: Identity Information (0x08) len 16 Identity resolving key[16]: d7e08edef97d3e62cd2331f82d8073b0
ACL Data RX: Handle 2048 flags 0x02 dlen 21
SMP: Signing Information (0x0a) len 16 Signature key[16]: 1716c536f94e843a9aea8b13ffde477d Bluetooth: hci0: unexpected SMP command 0x0a from XX:XX:XX:XX:XX:XX
ACL Data RX: Handle 2048 flags 0x02 dlen 12
SMP: Identity Address Information (0x09) len 7 Address: XX:XX:XX:XX:XX:XX (Intel Corporate)
While accourding to core spec 6.1 the expected order is always BD_ADDR first first then CSRK:
When using LE legacy pairing, the keys shall be distributed in the following order:
LTK by the Peripheral
EDIV and Rand by the Peripheral
IRK by the Peripheral
BD_ADDR by the Peripheral
CSRK by the Peripheral
LTK by the Central
EDIV and Rand by the Central
IRK by the Central
BD_ADDR by the Central
CSRK by the Central
When using LE Secure Connections, the keys shall be distributed in the following order:
IRK by the Peripheral
BD_ADDR by the Peripheral
CSRK by the Peripheral
IRK by the Central
BD_ADDR by the Central
CSRK by the Central
According to the Core 6.1 for commands used for key distribution "Key Rejected" can be used:
'3.6.1. Key distribution and generation
A device may reject a distributed key by sending the Pairing Failed command with the reason set to "Key Rejected".
Fixes: b28b4943660f ("Bluetooth: Add strict checks for allowed SMP PDUs") Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/bluetooth/smp.c | 19 ++++++++++++++++++- net/bluetooth/smp.h | 1 + 2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index 4d5ba9778885d..3227956eb7417 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -2908,8 +2908,25 @@ static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) if (code > SMP_CMD_MAX) goto drop;
- if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) + if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) { + /* If there is a context and the command is not allowed consider + * it a failure so the session is cleanup properly. + */ + switch (code) { + case SMP_CMD_IDENT_INFO: + case SMP_CMD_IDENT_ADDR_INFO: + case SMP_CMD_SIGN_INFO: + /* 3.6.1. Key distribution and generation + * + * A device may reject a distributed key by sending the + * Pairing Failed command with the reason set to + * "Key Rejected". + */ + smp_failure(conn, SMP_KEY_REJECTED); + break; + } goto drop; + }
/* If we don't have a context the only allowed commands are * pairing request and security request. diff --git a/net/bluetooth/smp.h b/net/bluetooth/smp.h index 121edadd5f8da..f17de3d9778d0 100644 --- a/net/bluetooth/smp.h +++ b/net/bluetooth/smp.h @@ -138,6 +138,7 @@ struct smp_cmd_keypress_notify { #define SMP_NUMERIC_COMP_FAILED 0x0c #define SMP_BREDR_PAIRING_IN_PROGRESS 0x0d #define SMP_CROSS_TRANSP_NOT_ALLOWED 0x0e +#define SMP_KEY_REJECTED 0x0f
#define SMP_MIN_ENC_KEY_SIZE 7 #define SMP_MAX_ENC_KEY_SIZE 16