1938288f 3 net.c:306:mg_mgr_init        MG_IO_SIZE: 16384, TLS: none
1938288f 3 net.c:223:mg_listen          1 4 udp://224.0.0.251:5353
[*] mDNS server ready on UDP/5353
1938307c 3 sock.c:360:read_conn         1 4 0:0:0 34 err 0
1938307c 3 dns.c:438:handle_mdns_query  PTR request for _http._tcp
[+] Got mDNS request! Type=12
[+] PTR request for _http._tcp
[VULN] Setting 300-byte TXT record
=================================================================
==5894==ERROR: AddressSanitizer: stack-buffer-overflow on address 0xf34ef370033a at pc 0xf34ef5855124 bp 0xfffff8043ed0 sp 0xfffff80436b0
WRITE of size 300 at 0xf34ef370033a thread T0
    #0 0xf34ef5855120 in memcpy ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors_memintrinsics.inc:115
    #1 0xc43522a011f4 in build_txt_record src/dns.c:390
    #2 0xc43522a028d4 in handle_mdns_query src/dns.c:496
    #3 0xc43522a03b68 in handle_mdns_record src/dns.c:575
    #4 0xc43522a03c38 in mdns_cb src/dns.c:584
    #5 0xc43522a03f58 in mg_call src/event.c:21
    #6 0xc43522a39438 in iolog src/sock.c:133
    #7 0xc43522a3b74c in read_conn src/sock.c:362
    #8 0xc43522a40774 in mg_mgr_poll src/sock.c:783
    #9 0xc43522a4cda0 in main /data/pruva/runs/17a15ce6-4969-4882-9c55-0a227b0d8ef1/coding/tmp_verify/mdns_verify_harness.c:45
    #10 0xf34ef55d84c0  (/lib/aarch64-linux-gnu/libc.so.6+0x284c0) (BuildId: d6c205bda1b6e91815f8fef45bdf56bc2239c37e)
    #11 0xf34ef55d8594 in __libc_start_main (/lib/aarch64-linux-gnu/libc.so.6+0x28594) (BuildId: d6c205bda1b6e91815f8fef45bdf56bc2239c37e)
    #12 0xc435229fb26c in _start (/data/pruva/runs/17a15ce6-4969-4882-9c55-0a227b0d8ef1/coding/tmp_verify/mdns_verify+0xb26c) (BuildId: a1ed437f16d42fa2a18f6f3236cf78ae84dde799)

Address 0xf34ef370033a is located in stack of thread T0 at offset 826 in frame
    #0 0xc43522a01290 in handle_mdns_query src/dns.c:396

  This frame has 7 object(s):
    [32, 34) 'offset' (line 480)
    [48, 50) 'offset' (line 506)
    [64, 72) 'rr' (line 398)
    [96, 112) 'defname' (line 411)
    [128, 192) 'req' (line 413)
    [224, 480) 'name' (line 408)
    [544, 826) 'buf' (line 405) <== Memory access at offset 826 overflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors_memintrinsics.inc:115 in memcpy
Shadow bytes around the buggy address:
  0xf34ef3700080: 00 00 00 00 00 00 00 00 f2 f2 f2 f2 00 00 00 00
  0xf34ef3700100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0xf34ef3700180: 00 00 00 00 00 00 00 00 00 00 00 00 f2 f2 f2 f2
  0xf34ef3700200: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00
  0xf34ef3700280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0xf34ef3700300: 00 00 00 00 00 00 00[02]f3 f3 f3 f3 f3 f3 f3 f3
  0xf34ef3700380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0xf34ef3700400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0xf34ef3700480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0xf34ef3700500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0xf34ef3700580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==5894==ABORTING