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| author | Eugene Syromiatnikov <esyr@redhat.com> | 2021-11-03 20:09:42 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-11-04 19:17:34 -0700 |
| commit | 1e4b50f06d970d8da3474d2a0354450416710bda (patch) | |
| tree | 6fa90ca2b8f3b2c3046d7bd71c925c7c368d72f3 /net | |
| parent | a5bda90884bf4a6b455335244cad092a07f3eade (diff) | |
| download | linux-1e4b50f06d970d8da3474d2a0354450416710bda.tar.gz linux-1e4b50f06d970d8da3474d2a0354450416710bda.tar.bz2 linux-1e4b50f06d970d8da3474d2a0354450416710bda.zip | |
mctp: handle the struct sockaddr_mctp padding fields
In order to have the padding fields actually usable in the future,
there have to be checks that user space doesn't supply non-zero garbage
there. It is also worth setting these padding fields to zero, unless
it is known that they have been already zeroed.
Cc: stable@vger.kernel.org # v5.15
Fixes: 5a20dd46b8b84593 ("mctp: Be explicit about struct sockaddr_mctp padding")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Acked-by: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mctp/af_mctp.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/net/mctp/af_mctp.c b/net/mctp/af_mctp.c index d344b02a1cde..bc88159f8844 100644 --- a/net/mctp/af_mctp.c +++ b/net/mctp/af_mctp.c @@ -33,6 +33,12 @@ static int mctp_release(struct socket *sock) return 0; } +/* Generic sockaddr checks, padding checks only so far */ +static bool mctp_sockaddr_is_ok(const struct sockaddr_mctp *addr) +{ + return !addr->__smctp_pad0 && !addr->__smctp_pad1; +} + static int mctp_bind(struct socket *sock, struct sockaddr *addr, int addrlen) { struct sock *sk = sock->sk; @@ -52,6 +58,9 @@ static int mctp_bind(struct socket *sock, struct sockaddr *addr, int addrlen) /* it's a valid sockaddr for MCTP, cast and do protocol checks */ smctp = (struct sockaddr_mctp *)addr; + if (!mctp_sockaddr_is_ok(smctp)) + return -EINVAL; + lock_sock(sk); /* TODO: allow rebind */ @@ -87,6 +96,8 @@ static int mctp_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) return -EINVAL; if (addr->smctp_family != AF_MCTP) return -EINVAL; + if (!mctp_sockaddr_is_ok(addr)) + return -EINVAL; if (addr->smctp_tag & ~(MCTP_TAG_MASK | MCTP_TAG_OWNER)) return -EINVAL; @@ -198,11 +209,13 @@ static int mctp_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, addr = msg->msg_name; addr->smctp_family = AF_MCTP; + addr->__smctp_pad0 = 0; addr->smctp_network = cb->net; addr->smctp_addr.s_addr = hdr->src; addr->smctp_type = type; addr->smctp_tag = hdr->flags_seq_tag & (MCTP_HDR_TAG_MASK | MCTP_HDR_FLAG_TO); + addr->__smctp_pad1 = 0; msg->msg_namelen = sizeof(*addr); if (msk->addr_ext) { |