diff options
author | delphij <delphij@FreeBSD.org> | 2014-07-08 21:54:27 +0000 |
---|---|---|
committer | delphij <delphij@FreeBSD.org> | 2014-07-08 21:54:27 +0000 |
commit | b74f97a13b172cbc9cfe536514c5393abe0a3be1 (patch) | |
tree | 99ef8ee7617a8e7caae7ea6df3efef9b229d9f57 /sys/netinet | |
parent | 9f91b4b71b2c902702c52eee03fba3b9c603c14b (diff) | |
download | FreeBSD-src-b74f97a13b172cbc9cfe536514c5393abe0a3be1.zip FreeBSD-src-b74f97a13b172cbc9cfe536514c5393abe0a3be1.tar.gz |
Initialize SCTP cmsg's and notification's buffer before copying out
to userland.
Submitted by: tuexen
Security: CVE-2014-3953
Security: FreeBSD-SA-14:17.kmem
Diffstat (limited to 'sys/netinet')
-rw-r--r-- | sys/netinet/sctp_auth.c | 1 | ||||
-rw-r--r-- | sys/netinet/sctp_indata.c | 5 | ||||
-rw-r--r-- | sys/netinet/sctputil.c | 55 |
3 files changed, 34 insertions, 27 deletions
diff --git a/sys/netinet/sctp_auth.c b/sys/netinet/sctp_auth.c index 08b6a49..d4d4059 100644 --- a/sys/netinet/sctp_auth.c +++ b/sys/netinet/sctp_auth.c @@ -1790,6 +1790,7 @@ sctp_notify_authentication(struct sctp_tcb *stcb, uint32_t indication, SCTP_BUF_LEN(m_notify) = 0; auth = mtod(m_notify, struct sctp_authkey_event *); + memset(auth, 0, sizeof(struct sctp_authkey_event)); auth->auth_type = SCTP_AUTHENTICATION_EVENT; auth->auth_flags = 0; auth->auth_length = sizeof(*auth); diff --git a/sys/netinet/sctp_indata.c b/sys/netinet/sctp_indata.c index 52ba865..eac73e5 100644 --- a/sys/netinet/sctp_indata.c +++ b/sys/netinet/sctp_indata.c @@ -250,6 +250,11 @@ sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo) /* We need a CMSG header followed by the struct */ cmh = mtod(ret, struct cmsghdr *); + /* + * Make sure that there is no un-initialized padding between the + * cmsg header and cmsg data and after the cmsg data. + */ + memset(cmh, 0, len); if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) { cmh->cmsg_level = IPPROTO_SCTP; cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_rcvinfo)); diff --git a/sys/netinet/sctputil.c b/sys/netinet/sctputil.c index 53e5869..24b4231 100644 --- a/sys/netinet/sctputil.c +++ b/sys/netinet/sctputil.c @@ -2622,6 +2622,7 @@ sctp_notify_assoc_change(uint16_t state, struct sctp_tcb *stcb, } SCTP_BUF_NEXT(m_notify) = NULL; sac = mtod(m_notify, struct sctp_assoc_change *); + memset(sac, 0, notif_len); sac->sac_type = SCTP_ASSOC_CHANGE; sac->sac_flags = 0; sac->sac_length = sizeof(struct sctp_assoc_change); @@ -2835,21 +2836,21 @@ sctp_notify_send_failed(struct sctp_tcb *stcb, uint8_t sent, uint32_t error, if (m_notify == NULL) /* no space left */ return; - length += chk->send_size; - length -= sizeof(struct sctp_data_chunk); SCTP_BUF_LEN(m_notify) = 0; if (sctp_stcb_is_feature_on(stcb->sctp_ep, stcb, SCTP_PCB_FLAGS_RECVNSENDFAILEVNT)) { ssfe = mtod(m_notify, struct sctp_send_failed_event *); + memset(ssfe, 0, length); ssfe->ssfe_type = SCTP_SEND_FAILED_EVENT; if (sent) { ssfe->ssfe_flags = SCTP_DATA_SENT; } else { ssfe->ssfe_flags = SCTP_DATA_UNSENT; } + length += chk->send_size; + length -= sizeof(struct sctp_data_chunk); ssfe->ssfe_length = length; ssfe->ssfe_error = error; /* not exactly what the user sent in, but should be close :) */ - bzero(&ssfe->ssfe_info, sizeof(ssfe->ssfe_info)); ssfe->ssfe_info.snd_sid = chk->rec.data.stream_number; ssfe->ssfe_info.snd_flags = chk->rec.data.rcv_flags; ssfe->ssfe_info.snd_ppid = chk->rec.data.payloadtype; @@ -2859,12 +2860,15 @@ sctp_notify_send_failed(struct sctp_tcb *stcb, uint8_t sent, uint32_t error, SCTP_BUF_LEN(m_notify) = sizeof(struct sctp_send_failed_event); } else { ssf = mtod(m_notify, struct sctp_send_failed *); + memset(ssf, 0, length); ssf->ssf_type = SCTP_SEND_FAILED; if (sent) { ssf->ssf_flags = SCTP_DATA_SENT; } else { ssf->ssf_flags = SCTP_DATA_UNSENT; } + length += chk->send_size; + length -= sizeof(struct sctp_data_chunk); ssf->ssf_length = length; ssf->ssf_error = error; /* not exactly what the user sent in, but should be close :) */ @@ -2948,16 +2952,16 @@ sctp_notify_send_failed2(struct sctp_tcb *stcb, uint32_t error, /* no space left */ return; } - length += sp->length; SCTP_BUF_LEN(m_notify) = 0; if (sctp_stcb_is_feature_on(stcb->sctp_ep, stcb, SCTP_PCB_FLAGS_RECVNSENDFAILEVNT)) { ssfe = mtod(m_notify, struct sctp_send_failed_event *); + memset(ssfe, 0, length); ssfe->ssfe_type = SCTP_SEND_FAILED_EVENT; ssfe->ssfe_flags = SCTP_DATA_UNSENT; + length += sp->length; ssfe->ssfe_length = length; ssfe->ssfe_error = error; /* not exactly what the user sent in, but should be close :) */ - bzero(&ssfe->ssfe_info, sizeof(ssfe->ssfe_info)); ssfe->ssfe_info.snd_sid = sp->stream; if (sp->some_taken) { ssfe->ssfe_info.snd_flags = SCTP_DATA_LAST_FRAG; @@ -2971,12 +2975,13 @@ sctp_notify_send_failed2(struct sctp_tcb *stcb, uint32_t error, SCTP_BUF_LEN(m_notify) = sizeof(struct sctp_send_failed_event); } else { ssf = mtod(m_notify, struct sctp_send_failed *); + memset(ssf, 0, length); ssf->ssf_type = SCTP_SEND_FAILED; ssf->ssf_flags = SCTP_DATA_UNSENT; + length += sp->length; ssf->ssf_length = length; ssf->ssf_error = error; /* not exactly what the user sent in, but should be close :) */ - bzero(&ssf->ssf_info, sizeof(ssf->ssf_info)); ssf->ssf_info.sinfo_stream = sp->stream; ssf->ssf_info.sinfo_ssn = 0; if (sp->some_taken) { @@ -3038,6 +3043,7 @@ sctp_notify_adaptation_layer(struct sctp_tcb *stcb) return; SCTP_BUF_LEN(m_notify) = 0; sai = mtod(m_notify, struct sctp_adaptation_event *); + memset(sai, 0, sizeof(struct sctp_adaptation_event)); sai->sai_type = SCTP_ADAPTATION_INDICATION; sai->sai_flags = 0; sai->sai_length = sizeof(struct sctp_adaptation_event); @@ -3093,6 +3099,7 @@ sctp_notify_partial_delivery_indication(struct sctp_tcb *stcb, uint32_t error, return; SCTP_BUF_LEN(m_notify) = 0; pdapi = mtod(m_notify, struct sctp_pdapi_event *); + memset(pdapi, 0, sizeof(struct sctp_pdapi_event)); pdapi->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT; pdapi->pdapi_flags = 0; pdapi->pdapi_length = sizeof(struct sctp_pdapi_event); @@ -3202,6 +3209,7 @@ sctp_notify_shutdown_event(struct sctp_tcb *stcb) /* no space left */ return; sse = mtod(m_notify, struct sctp_shutdown_event *); + memset(sse, 0, sizeof(struct sctp_shutdown_event)); sse->sse_type = SCTP_SHUTDOWN_EVENT; sse->sse_flags = 0; sse->sse_length = sizeof(struct sctp_shutdown_event); @@ -3252,6 +3260,7 @@ sctp_notify_sender_dry_event(struct sctp_tcb *stcb, } SCTP_BUF_LEN(m_notify) = 0; event = mtod(m_notify, struct sctp_sender_dry_event *); + memset(event, 0, sizeof(struct sctp_sender_dry_event)); event->sender_dry_type = SCTP_SENDER_DRY_EVENT; event->sender_dry_flags = 0; event->sender_dry_length = sizeof(struct sctp_sender_dry_event); @@ -3284,7 +3293,6 @@ sctp_notify_stream_reset_add(struct sctp_tcb *stcb, uint16_t numberin, uint16_t struct mbuf *m_notify; struct sctp_queued_to_read *control; struct sctp_stream_change_event *stradd; - int len; if ((stcb == NULL) || (sctp_stcb_is_feature_off(stcb->sctp_ep, stcb, SCTP_PCB_FLAGS_STREAM_CHANGEEVNT))) { @@ -3297,25 +3305,20 @@ sctp_notify_stream_reset_add(struct sctp_tcb *stcb, uint16_t numberin, uint16_t return; } stcb->asoc.peer_req_out = 0; - m_notify = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); + m_notify = sctp_get_mbuf_for_msg(sizeof(struct sctp_stream_change_event), 0, M_NOWAIT, 1, MT_DATA); if (m_notify == NULL) /* no space left */ return; SCTP_BUF_LEN(m_notify) = 0; - len = sizeof(struct sctp_stream_change_event); - if (len > M_TRAILINGSPACE(m_notify)) { - /* never enough room */ - sctp_m_freem(m_notify); - return; - } stradd = mtod(m_notify, struct sctp_stream_change_event *); + memset(stradd, 0, sizeof(struct sctp_stream_change_event)); stradd->strchange_type = SCTP_STREAM_CHANGE_EVENT; stradd->strchange_flags = flag; - stradd->strchange_length = len; + stradd->strchange_length = sizeof(struct sctp_stream_change_event); stradd->strchange_assoc_id = sctp_get_associd(stcb); stradd->strchange_instrms = numberin; stradd->strchange_outstrms = numberout; - SCTP_BUF_LEN(m_notify) = len; + SCTP_BUF_LEN(m_notify) = sizeof(struct sctp_stream_change_event); SCTP_BUF_NEXT(m_notify) = NULL; if (sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv) < SCTP_BUF_LEN(m_notify)) { /* no space */ @@ -3346,32 +3349,26 @@ sctp_notify_stream_reset_tsn(struct sctp_tcb *stcb, uint32_t sending_tsn, uint32 struct mbuf *m_notify; struct sctp_queued_to_read *control; struct sctp_assoc_reset_event *strasoc; - int len; if ((stcb == NULL) || (sctp_stcb_is_feature_off(stcb->sctp_ep, stcb, SCTP_PCB_FLAGS_ASSOC_RESETEVNT))) { /* event not enabled */ return; } - m_notify = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); + m_notify = sctp_get_mbuf_for_msg(sizeof(struct sctp_assoc_reset_event), 0, M_NOWAIT, 1, MT_DATA); if (m_notify == NULL) /* no space left */ return; SCTP_BUF_LEN(m_notify) = 0; - len = sizeof(struct sctp_assoc_reset_event); - if (len > M_TRAILINGSPACE(m_notify)) { - /* never enough room */ - sctp_m_freem(m_notify); - return; - } strasoc = mtod(m_notify, struct sctp_assoc_reset_event *); + memset(strasoc, 0, sizeof(struct sctp_assoc_reset_event)); strasoc->assocreset_type = SCTP_ASSOC_RESET_EVENT; strasoc->assocreset_flags = flag; - strasoc->assocreset_length = len; + strasoc->assocreset_length = sizeof(struct sctp_assoc_reset_event); strasoc->assocreset_assoc_id = sctp_get_associd(stcb); strasoc->assocreset_local_tsn = sending_tsn; strasoc->assocreset_remote_tsn = recv_tsn; - SCTP_BUF_LEN(m_notify) = len; + SCTP_BUF_LEN(m_notify) = sizeof(struct sctp_assoc_reset_event); SCTP_BUF_NEXT(m_notify) = NULL; if (sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv) < SCTP_BUF_LEN(m_notify)) { /* no space */ @@ -3424,6 +3421,7 @@ sctp_notify_stream_reset(struct sctp_tcb *stcb, return; } strreset = mtod(m_notify, struct sctp_stream_reset_event *); + memset(strreset, 0, len); strreset->strreset_type = SCTP_STREAM_RESET_EVENT; strreset->strreset_flags = flag; strreset->strreset_length = len; @@ -6236,9 +6234,12 @@ sctp_soreceive(struct socket *so, fromlen = 0; } + if (filling_sinfo) { + memset(&sinfo, 0, sizeof(struct sctp_extrcvinfo)); + } error = sctp_sorecvmsg(so, uio, mp0, from, fromlen, flagsp, (struct sctp_sndrcvinfo *)&sinfo, filling_sinfo); - if ((controlp) && (filling_sinfo)) { + if (controlp != NULL) { /* copy back the sinfo in a CMSG format */ if (filling_sinfo) *controlp = sctp_build_ctl_nchunk(inp, |