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- Fix uninitialized memory passed in padding bytes of cmsg to sendmsg.

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W.C.A. Wijngaards 2023-08-18 13:18:46 +02:00
parent c4566aa5d3
commit 8756ad63dd
2 changed files with 21 additions and 0 deletions
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1
doc/Changelog
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@ -1,6 +1,7 @@
18 August 2023: Wouter
- Fix for iter_dec_attempts that could cause a hang, part of
capsforid and qname minimisation, depending on the settings.
- Fix uninitialized memory passed in padding bytes of cmsg to sendmsg.
17 August 2023: Wouter
- Merge PR #762: Downstream DNS Server Cookies a la RFC7873 and

20
util/netevent.c
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@ -592,6 +592,11 @@ comm_point_send_udp_msg_if(struct comm_point *c, sldns_buffer* packet,
cmsg_data = CMSG_DATA(cmsg);
((struct in_pktinfo *) cmsg_data)->ipi_ifindex = 0;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
/* zero the padding bytes inserted by the CMSG_LEN */
if(sizeof(struct in_pktinfo) < cmsg->cmsg_len)
memset(((uint8_t*)(CMSG_DATA(cmsg))) +
sizeof(struct in_pktinfo), 0, cmsg->cmsg_len
- sizeof(struct in_pktinfo));
#elif defined(IP_SENDSRCADDR)
msg.msg_controllen = CMSG_SPACE(sizeof(struct in_addr));
log_assert(msg.msg_controllen <= sizeof(control.buf));
@ -600,6 +605,11 @@ comm_point_send_udp_msg_if(struct comm_point *c, sldns_buffer* packet,
memmove(CMSG_DATA(cmsg), &r->pktinfo.v4addr,
sizeof(struct in_addr));
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
/* zero the padding bytes inserted by the CMSG_LEN */
if(sizeof(struct in_addr) < cmsg->cmsg_len)
memset(((uint8_t*)(CMSG_DATA(cmsg))) +
sizeof(struct in_addr), 0, cmsg->cmsg_len
- sizeof(struct in_addr));
#else
verbose(VERB_ALGO, "no IP_PKTINFO or IP_SENDSRCADDR");
msg.msg_control = NULL;
@ -616,6 +626,11 @@ comm_point_send_udp_msg_if(struct comm_point *c, sldns_buffer* packet,
cmsg_data = CMSG_DATA(cmsg);
((struct in6_pktinfo *) cmsg_data)->ipi6_ifindex = 0;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
/* zero the padding bytes inserted by the CMSG_LEN */
if(sizeof(struct in6_pktinfo) < cmsg->cmsg_len)
memset(((uint8_t*)(CMSG_DATA(cmsg))) +
sizeof(struct in6_pktinfo), 0, cmsg->cmsg_len
- sizeof(struct in6_pktinfo));
} else {
/* try to pass all 0 to use default route */
msg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
@ -624,6 +639,11 @@ comm_point_send_udp_msg_if(struct comm_point *c, sldns_buffer* packet,
cmsg->cmsg_type = IPV6_PKTINFO;
memset(CMSG_DATA(cmsg), 0, sizeof(struct in6_pktinfo));
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
/* zero the padding bytes inserted by the CMSG_LEN */
if(sizeof(struct in6_pktinfo) < cmsg->cmsg_len)
memset(((uint8_t*)(CMSG_DATA(cmsg))) +
sizeof(struct in6_pktinfo), 0, cmsg->cmsg_len
- sizeof(struct in6_pktinfo));
}
#endif /* S_SPLINT_S */
if(verbosity >= VERB_ALGO && r->srctype != 0)