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| author | Sabrina Dubroca <sd@queasysnail.net> | 2022-07-22 11:16:30 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-03 12:03:50 +0200 |
| commit | 2959a86a472f8828e0aeb6d558b64823f7af4a24 (patch) | |
| tree | 21648ff1383de20444d9ebe7c8300c40d2b59391 | |
| parent | a706a40d42f482ae3f03998a63dfdc8a8f3640c4 (diff) | |
| download | linux-2959a86a472f8828e0aeb6d558b64823f7af4a24.tar.gz linux-2959a86a472f8828e0aeb6d558b64823f7af4a24.tar.bz2 linux-2959a86a472f8828e0aeb6d558b64823f7af4a24.zip | |
macsec: always read MACSEC_SA_ATTR_PN as a u64
[ Upstream commit c630d1fe6219769049c87d1a6a0e9a6de55328a1 ]
Currently, MACSEC_SA_ATTR_PN is handled inconsistently, sometimes as a
u32, sometimes forced into a u64 without checking the actual length of
the attribute. Instead, we can use nla_get_u64 everywhere, which will
read up to 64 bits into a u64, capped by the actual length of the
attribute coming from userspace.
This fixes several issues:
- the check in validate_add_rxsa doesn't work with 32-bit attributes
- the checks in validate_add_txsa and validate_upd_sa incorrectly
reject X << 32 (with X != 0)
Fixes: 48ef50fa866a ("macsec: Netlink support of XPN cipher suites (IEEE 802.1AEbw)")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/net/macsec.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c index 1f2eb576533c..3e74dcc1f875 100644 --- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -1696,7 +1696,7 @@ static bool validate_add_rxsa(struct nlattr **attrs) return false; if (attrs[MACSEC_SA_ATTR_PN] && - *(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0) + nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) return false; if (attrs[MACSEC_SA_ATTR_ACTIVE]) { @@ -1939,7 +1939,7 @@ static bool validate_add_txsa(struct nlattr **attrs) if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) return false; - if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) + if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) return false; if (attrs[MACSEC_SA_ATTR_ACTIVE]) { @@ -2293,7 +2293,7 @@ static bool validate_upd_sa(struct nlattr **attrs) if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) return false; - if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) + if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0) return false; if (attrs[MACSEC_SA_ATTR_ACTIVE]) { |