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- Fix #1288: [FR] Improve fuzzing of unbound by adapting the netbound

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program.
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W.C.A. Wijngaards
2025-05-21 12:41:54 +02:00
parent 342a0f48e3
commit ff7dfd52a2
6 changed files with 196 additions and 22 deletions
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testcode/testpkts.c
+19 -2
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@@ -923,10 +923,14 @@ pkt_snip_edns_option(uint8_t* pkt, size_t len, sldns_edns_option code,
if(!pkt_find_edns_opt(&opt_position, &remaining)) return 0;
if(remaining < 8) return -1; /* malformed */
rdlen = sldns_read_uint16(opt_position+6);
if(remaining < ((size_t)rdlen)+8)
return -1; /* malformed */
rdata = opt_position + 8;
while(rdlen > 0) {
if(rdlen < 4) return -1; /* malformed */
optlen = sldns_read_uint16(rdata+2);
if((size_t)rdlen < 4+((size_t)optlen))
return -1; /* malformed */
if(sldns_read_uint16(rdata) == code) {
/* save data to buf for caller inspection */
memmove(buf, rdata+4, optlen);
@@ -1134,8 +1138,9 @@ static void lowercase_dname(uint8_t** p, size_t* remain)
while(**p != 0) {
/* compressed? */
if((**p & 0xc0) == 0xc0) {
*p += 2;
*remain -= 2;
llen = *remain < 2 ? (unsigned int)*remain : 2;
*p += llen;
*remain -= llen;
return;
}
llen = (unsigned int)**p;
@@ -1178,6 +1183,12 @@ static void lowercase_rdata(uint8_t** p, size_t* remain,
uint8_t len;
if(rdataremain == 0) return;
len = **p;
if(rdataremain < ((size_t)len)+1) {
/* malformed LDNS_RDF_TYPE_STR, skip remainder */
*p += rdataremain;
*remain -= rdatalen;
return;
}
*p += len+1;
rdataremain -= len+1;
} else {
@@ -1207,6 +1218,12 @@ static void lowercase_rdata(uint8_t** p, size_t* remain,
break;
default: error("bad rdf type in lowercase %d", (int)f);
}
if (rdataremain < (size_t)len) {
/* malformed RDF, skip remainder */
*p += rdataremain;
*remain -= rdatalen;
return;
}
*p += len;
rdataremain -= len;
}