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net-misc/frr: learn to read bugs

This commit is contained in:
Alarig Le Lay 2023-11-10 09:40:17 +01:00
parent 3098c7a99e
commit f6e95a24c5
Signed by: alarig
GPG Key ID: 7AFE62C6DF8BCDEC
1 changed files with 159 additions and 99 deletions
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258
net-misc/frr/files/frr-9.0-bug-913242.patch
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@ -1,113 +1,173 @@
diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
index dcf0f4d47cfb..8c53191d680f 100644
index 60e41ac1cc83..7badc6a17cbf 100644
--- a/bgpd/bgp_attr.c
+++ b/bgpd/bgp_attr.c
@@ -1405,6 +1405,7 @@ bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode,
case BGP_ATTR_LARGE_COMMUNITIES:
case BGP_ATTR_ORIGINATOR_ID:
case BGP_ATTR_CLUSTER_LIST:
+ case BGP_ATTR_ENCAP:
case BGP_ATTR_OTC:
return BGP_ATTR_PARSE_WITHDRAW;
case BGP_ATTR_MP_REACH_NLRI:
@@ -2635,26 +2636,21 @@ bgp_attr_ipv6_ext_communities(struct bgp_attr_parser_args *args)
@@ -2388,7 +2388,7 @@ int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
mp_update->afi = afi;
mp_update->safi = safi;
- return BGP_ATTR_PARSE_EOR;
+ return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_ATTR, 0);
}
mp_update->afi = afi;
@@ -3349,13 +3349,15 @@ bgp_attr_unknown(struct bgp_attr_parser_args *args)
}
/* Parse Tunnel Encap attribute in an UPDATE */
-static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */
- bgp_size_t length, /* IN: attr's length field */
- struct attr *attr, /* IN: caller already allocated */
- uint8_t flag, /* IN: attr's flags field */
- uint8_t *startp)
+static int bgp_attr_encap(struct bgp_attr_parser_args *args)
/* Well-known attribute check. */
-static int bgp_attr_check(struct peer *peer, struct attr *attr)
+static int bgp_attr_check(struct peer *peer, struct attr *attr,
+ bgp_size_t length)
{
- bgp_size_t total;
uint16_t tunneltype = 0;
uint8_t type = 0;
/* BGP Graceful-Restart End-of-RIB for IPv4 unicast is signaled as an
* empty UPDATE. */
- if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag)
+ if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag &&
+ !length)
return BGP_ATTR_PARSE_PROCEED;
/* "An UPDATE message that contains the MP_UNREACH_NLRI is not required
@@ -3407,7 +3409,7 @@ enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr,
enum bgp_attr_parse_ret ret;
uint8_t flag = 0;
uint8_t type = 0;
- bgp_size_t length;
+ bgp_size_t length = 0;
uint8_t *startp, *endp;
uint8_t *attr_endp;
uint8_t seen[BGP_ATTR_BITMAP_SIZE];
@@ -3658,10 +3660,6 @@ enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr,
goto done;
}
- if (ret == BGP_ATTR_PARSE_EOR) {
- goto done;
- }
-
- total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3);
+ struct peer *const peer = args->peer;
+ struct attr *const attr = args->attr;
+ bgp_size_t length = args->length;
+ uint8_t type = args->type;
+ uint8_t flag = args->flags;
if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS)
|| !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) {
- zlog_info(
- "Tunnel Encap attribute flag isn't optional and transitive %d",
- flag);
- bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR,
- BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR,
- startp, total);
- return -1;
+ zlog_err("Tunnel Encap attribute flag isn't optional and transitive %d",
+ flag);
+ return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
+ args->total);
if (ret == BGP_ATTR_PARSE_ERROR) {
flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR,
"%s: Attribute %s, parse error", peer->host,
@@ -3734,7 +3732,7 @@ enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr,
}
if (BGP_ATTR_ENCAP == type) {
@@ -2662,12 +2658,11 @@ static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */
uint16_t tlv_length;
/* Check all mandatory well-known attributes are present */
- ret = bgp_attr_check(peer, attr);
+ ret = bgp_attr_check(peer, attr, length);
if (ret < 0)
goto done;
if (length < 4) {
- zlog_info(
+ zlog_err(
"Tunnel Encap attribute not long enough to contain outer T,L");
- bgp_notify_send_with_data(
- peer, BGP_NOTIFY_UPDATE_ERR,
- BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total);
- return -1;
+ return bgp_attr_malformed(args,
+ BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
+ args->total);
}
tunneltype = stream_getw(BGP_INPUT(peer));
tlv_length = stream_getw(BGP_INPUT(peer));
@@ -2699,13 +2694,11 @@ static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */
diff --git a/bgpd/bgp_attr.h b/bgpd/bgp_attr.h
index 1c7e88a4f9e2..3db0863d3b5a 100644
--- a/bgpd/bgp_attr.h
+++ b/bgpd/bgp_attr.h
@@ -364,7 +364,6 @@ enum bgp_attr_parse_ret {
/* only used internally, send notify + convert to BGP_ATTR_PARSE_ERROR
*/
BGP_ATTR_PARSE_ERROR_NOTIFYPLS = -3,
- BGP_ATTR_PARSE_EOR = -4,
};
struct bpacket_attr_vec_arr;
diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c
index ec692277b26b..f88e1e5afcbb 100644
--- a/bgpd/bgp_packet.c
+++ b/bgpd/bgp_packet.c
@@ -2053,8 +2053,7 @@ static int bgp_update_receive(struct peer *peer, bgp_size_t size)
* Non-MP IPv4/Unicast EoR is a completely empty UPDATE
* and MP EoR should have only an empty MP_UNREACH
*/
- if ((!update_len && !withdraw_len && nlris[NLRI_MP_UPDATE].length == 0)
- || (attr_parse_ret == BGP_ATTR_PARSE_EOR)) {
+ if (!update_len && !withdraw_len && nlris[NLRI_MP_UPDATE].length == 0) {
afi_t afi = 0;
safi_t safi;
struct graceful_restart_info *gr_info;
@@ -2075,9 +2074,6 @@ static int bgp_update_receive(struct peer *peer, bgp_size_t size)
&& nlris[NLRI_MP_WITHDRAW].length == 0) {
afi = nlris[NLRI_MP_WITHDRAW].afi;
safi = nlris[NLRI_MP_WITHDRAW].safi;
- } else if (attr_parse_ret == BGP_ATTR_PARSE_EOR) {
- afi = nlris[NLRI_MP_UPDATE].afi;
- safi = nlris[NLRI_MP_UPDATE].safi;
}
if (sublength > length) {
- zlog_info(
- "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d",
- sublength, length);
- bgp_notify_send_with_data(
- peer, BGP_NOTIFY_UPDATE_ERR,
- BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total);
- return -1;
+ zlog_err("Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d",
+ sublength, length);
+ return bgp_attr_malformed(args,
+ BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
+ args->total);
}
/* alloc and copy sub-tlv */
@@ -2753,13 +2746,10 @@ static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */
if (length) {
/* spurious leftover data */
- zlog_info(
- "Tunnel Encap attribute length is bad: %d leftover octets",
- length);
- bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR,
- BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
- startp, total);
- return -1;
+ zlog_err("Tunnel Encap attribute length is bad: %d leftover octets",
+ length);
+ return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
+ args->total);
if (afi && peer->afc[afi][safi]) {
diff --git a/bgpd/bgp_open.c b/bgpd/bgp_open.c
index 0dd5463979ad..e7e3c2191a7a 100644
--- a/bgpd/bgp_open.c
+++ b/bgpd/bgp_open.c
@@ -940,8 +940,18 @@ static int bgp_capability_software_version(struct peer *peer,
return -1;
}
return 0;
@@ -3732,8 +3722,7 @@ enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr,
case BGP_ATTR_VNC:
#endif
case BGP_ATTR_ENCAP:
- ret = bgp_attr_encap(type, peer, length, attr, flag,
- startp);
+ ret = bgp_attr_encap(&attr_args);
break;
case BGP_ATTR_PREFIX_SID:
ret = bgp_attr_prefix_sid(&attr_args);
- if (len) {
+ if (len > BGP_MAX_SOFT_VERSION) {
+ flog_warn(EC_BGP_CAPABILITY_INVALID_LENGTH,
+ "%s: Received Software Version, but the length is too big, truncating, from peer %s",
+ __func__, peer->host);
+ stream_get(str, s, BGP_MAX_SOFT_VERSION);
+ stream_forward_getp(s, len - BGP_MAX_SOFT_VERSION);
+ len = BGP_MAX_SOFT_VERSION;
+ } else if (len) {
stream_get(str, s, len);
+ }
+
+ if (len) {
str[len] = '\0';
XFREE(MTYPE_BGP_SOFT_VERSION, peer->soft_version);
diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
index 3ecffb99d171..d3a02a3df641 100644
--- a/bgpd/bgp_attr.c
+++ b/bgpd/bgp_attr.c
@@ -492,6 +492,7 @@ static bool bgp_attr_aigp_valid(uint8_t *pnt, int length)
uint8_t *data = pnt;
uint8_t tlv_type;
uint16_t tlv_length;
+ uint8_t *end = data + length;
if (length < 3) {
zlog_err("Bad AIGP attribute length (MUST be minimum 3): %u",
@@ -500,7 +501,13 @@ static bool bgp_attr_aigp_valid(uint8_t *pnt, int length)
}
while (length) {
+ size_t data_len = end - data;
+
tlv_type = *data;
+
+ if (data_len - 1 < 2)
+ return false;
+
ptr_get_be16(data + 1, &tlv_length);
(void)data;
diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c
index c852203e5b66..ec692277b26b 100644
--- a/bgpd/bgp_packet.c
+++ b/bgpd/bgp_packet.c
@@ -1976,7 +1976,7 @@ static int bgp_update_receive(struct peer *peer, bgp_size_t size)
/* Network Layer Reachability Information. */
update_len = end - stream_pnt(s);
- if (update_len) {
+ if (update_len && attribute_len) {
/* Set NLRI portion to structure. */
nlris[NLRI_UPDATE].afi = AFI_IP;
nlris[NLRI_UPDATE].safi = SAFI_UNICAST;
diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c
index bd17a2eec84e..c852203e5b66 100644
--- a/bgpd/bgp_packet.c
+++ b/bgpd/bgp_packet.c
@@ -2401,7 +2401,8 @@ static int bgp_route_refresh_receive(struct peer *peer, bgp_size_t size)
* and 7 bytes of ORF Address-filter entry from
* the stream
*/
- if (*p_pnt & ORF_COMMON_PART_REMOVE_ALL) {
+ if (p_pnt < p_end &&
+ *p_pnt & ORF_COMMON_PART_REMOVE_ALL) {
if (bgp_debug_neighbor_events(peer))
zlog_debug(
"%pBP rcvd Remove-All pfxlist ORF request",