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cdecker
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Dec 8, 2020
As reported by Wladimir J. van der Laan. Valgrind will complain about padding and unset fields, so memset the structs. ``` ==42653== Syscall param socketcall.connect(serv_addr..sa_len) points to uninitialised byte(s) ==42653== at 0x4C7D19A: _connect (in /lib/libc.so.7) ==42653== by 0x4EE1F35: ??? (in /lib/libthr.so.3) ==42653== by 0x249D57: get_local_sockname (netaddress.c:212) ==42653== by 0x249CDB: guess_address (netaddress.c:242) ==42653== by 0x2473D0: public_address (connectd.c:1003) ==42653== by 0x246CE4: setup_listeners (connectd.c:0) ==42653== by 0x246566: connect_init (connectd.c:1311) ==42653== by 0x270CEB: next_plan (io.c:59) ==42653== by 0x2713EE: io_ready (io.c:417) ==42653== by 0x2726B1: io_loop (poll.c:445) ==42653== by 0x24618A: main (connectd.c:1703) ==42653== Address 0x7fc000690 is on thread 1's stack ==42653== in frame #3, created by guess_address (netaddress.c:231) ``` Signed-off-by: Rusty Russell <[email protected]>
cdecker
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Aug 23, 2021
The variable `block` (instace of `struct block`) is
allocated on the stack without being initialized, i.e. its
member `prev` points to nowhere. This causes a segmentation
fault on my machine on the binding of "prev_hash" on running
`wallet_block_add`, as the following core-dump analysis
shows:
$ egdb ./wallet/test/run-wallet ./run-wallet.core
[...]
Core was generated by `run-wallet'.
Program terminated with signal SIGSEGV, Segmentation fault.
---Type <return> to continue, or q <return> to quit---
#0 0x000008f67a04b660 in memcpy (dst0=<optimized out>, src0=0x100007f8c, length=32) at /usr/src/lib/libc/string/memcpy.c:97
97 TLOOP1(*dst++ = *src++);
(gdb) bt
#0 0x000008f67a04b660 in memcpy (dst0=<optimized out>, src0=0x100007f8c, length=32) at /usr/src/lib/libc/string/memcpy.c:97
#1 0x000008f73e838f60 in sqlite3VdbeMemSetStr () from /usr/local/lib/libsqlite3.so.37.12
#2 0x000008f73e83cb11 in bindText () from /usr/local/lib/libsqlite3.so.37.12
#3 0x000008f44bc91345 in db_sqlite3_query (stmt=0x8f6845bf028) at wallet/db_sqlite3.c:77
#4 0x000008f44bc91122 in db_sqlite3_exec (stmt=0x8f6845bf028) at wallet/db_sqlite3.c:110
#5 0x000008f44bcbb3b2 in db_exec_prepared_v2 (stmt=0x8f6845bf028) at ./wallet/db.c:2055
#6 0x000008f44bcc6890 in wallet_block_add (w=0x8f688b5bba8, b=0x7f7ffffca788) at ./wallet/wallet.c:3556
ElementsProject#7 0x000008f44bce2607 in test_wallet_outputs (ld=0x8f6a35a7828, ctx=0x8f6a35c0268) at wallet/test/run-wallet.c:1104
ElementsProject#8 0x000008f44bcddec0 in main (argc=1, argv=0x7f7ffffcaaf8) at wallet/test/run-wallet.c:1930
Fix by explicitely setting the whole structure to zero.
[ Rebuilt generated files, too --RR ]
cdecker
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Feb 22, 2023
This will fix a crash that I caused on armv7 and by looking inside the coredump with gdb (by adding an assert on n that must be different from null) I get the following stacktrace ``` (gdb) bt \#0 0x00000000 in ?? () \#1 0x0043a038 in send_backtrace (why=0xbe9e3600 "FATAL SIGNAL 11") at common/daemon.c:36 \#2 0x0043a0ec in crashdump (sig=11) at common/daemon.c:46 \#3 <signal handler called> \#4 0x00406d04 in node_announcement (map=0x938ecc, nann_off=495146) at common/gossmap.c:586 \#5 0x00406fec in map_catchup (map=0x938ecc, num_rejected=0xbe9e3a40) at common/gossmap.c:643 \#6 0x004073a4 in load_gossip_store (map=0x938ecc, num_rejected=0xbe9e3a40) at common/gossmap.c:697 \ElementsProject#7 0x00408244 in gossmap_load (ctx=0x0, filename=0x4e16b8 "gossip_store", num_channel_updates_rejected=0xbe9e3a40) at common/gossmap.c:976 \ElementsProject#8 0x0041a548 in init (p=0x93831c, buf=0x9399d4 "\n\n{\"jsonrpc\":\"2.0\",\"id\":\"cln:init#25\",\"method\":\"init\",\"params\":{\"options\":{},\"configuration\":{\"lightning-dir\":\"/home/vincent/.lightning/testnet\",\"rpc-file\":\"lightning-rpc\",\"startup\":true,\"network\":\"te"..., config=0x939cdc) at plugins/topology.c:622 \ElementsProject#9 0x0041e5d0 in handle_init (cmd=0x938934, buf=0x9399d4 "\n\n{\"jsonrpc\":\"2.0\",\"id\":\"cln:init#25\",\"method\":\"init\",\"params\":{\"options\":{},\"configuration\":{\"lightning-dir\":\"/home/vincent/.lightning/testnet\",\"rpc-file\":\"lightning-rpc\",\"startup\":true,\"network\":\"te"..., params=0x939c8c) at plugins/libplugin.c:1208 \ElementsProject#10 0x0041fc04 in ld_command_handle (plugin=0x93831c, toks=0x939bec) at plugins/libplugin.c:1572 \ElementsProject#11 0x00420050 in ld_read_json_one (plugin=0x93831c) at plugins/libplugin.c:1667 \ElementsProject#12 0x004201bc in ld_read_json (conn=0x9391c4, plugin=0x93831c) at plugins/libplugin.c:1687 \ElementsProject#13 0x004cb82c in next_plan (conn=0x9391c4, plan=0x9391d8) at ccan/ccan/io/io.c:59 \ElementsProject#14 0x004cc67c in do_plan (conn=0x9391c4, plan=0x9391d8, idle_on_epipe=false) at ccan/ccan/io/io.c:407 \ElementsProject#15 0x004cc6dc in io_ready (conn=0x9391c4, pollflags=1) at ccan/ccan/io/io.c:417 \ElementsProject#16 0x004cf8cc in io_loop (timers=0x9383c4, expired=0xbe9e3ce4) at ccan/ccan/io/poll.c:453 \ElementsProject#17 0x00420af4 in plugin_main (argv=0xbe9e3eb4, init=0x41a46c <init>, restartability=PLUGIN_STATIC, init_rpc=true, features=0x0, commands=0x6167e8 <commands>, num_commands=4, notif_subs=0x0, num_notif_subs=0, hook_subs=0x0, num_hook_subs=0, notif_topics=0x0, num_notif_topics=0) at plugins/libplugin.c:1891 \ElementsProject#18 0x0041a6f8 in main (argc=1, argv=0xbe9e3eb4) at plugins/topology.c:679 ``` I do not know if this is a solution because I do not know when I can parse a node announcement for a node that it is not longer in the gossip map. So, I hope this is just usefult for @rustyrussell Changelog-Fixed: fixes `FATAL SIGNAL 11` on gossmap node announcement parsing. Signed-off-by: Vincenzo Palazzo <[email protected]>
cdecker
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Mar 23, 2023
The issue is that common_setup() wasn't called by the fuzz target,
leaving secp256k1_ctx as NULL.
UBSan error:
$ UBSAN_OPTIONS="print_stacktrace=1:halt_on_error=1" \
./fuzz-channel_id crash-1575b41ef09e62e4c09c165e6dc037a110b113f2
INFO: Running with entropic power schedule (0xFF, 100).
INFO: Seed: 1153355603
INFO: Loaded 1 modules (25915 inline 8-bit counters): 25915 [0x563bae7ac3a8, 0x563bae7b28e3),
INFO: Loaded 1 PC tables (25915 PCs): 25915 [0x563bae7b28e8,0x563bae817c98),
./fuzz-channel_id: Running 1 inputs 1 time(s) each.
Running: crash-1575b41ef09e62e4c09c165e6dc037a110b113f2
bitcoin/pubkey.c:22:33: runtime error: null pointer passed as argument 1, which is declared to never be null
external/libwally-core/src/secp256k1/include/secp256k1.h:373:3: note: nonnull attribute specified here
#0 0x563bae41e3db in pubkey_from_der bitcoin/pubkey.c:19:7
#1 0x563bae4205e0 in fromwire_pubkey bitcoin/pubkey.c:111:7
#2 0x563bae46437c in run tests/fuzz/fuzz-channel_id.c:42:3
#3 0x563bae2f6016 in LLVMFuzzerTestOneInput tests/fuzz/libfuzz.c:23:2
#4 0x563bae20a450 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long)
#5 0x563bae1f4c3f in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long)
#6 0x563bae1fa6e6 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long))
ElementsProject#7 0x563bae223052 in main (tests/fuzz/fuzz-channel_id+0x181052) (BuildId: f7f56e14ffc06df54ab732d79ea922e773de1f25)
ElementsProject#8 0x7fa7fa113082 in __libc_start_main
ElementsProject#9 0x563bae1efbdd in _start
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior bitcoin/pubkey.c:22:33 in
cdecker
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Jun 7, 2023
It is possible for db_column_bytes() to return 0 and for db_column_blob() to return NULL even when db_column_is_null() returns false. We need to short circuit in this case. Detected by UBSan: db/bindings.c:479:12: runtime error: null pointer passed as argument 2, which is declared to never be null /usr/include/string.h:44:28: note: nonnull attribute specified here #0 0x95f117 in db_col_arr_ db/bindings.c:479:2 #1 0x95ef85 in db_col_channel_type db/bindings.c:459:32 #2 0x852c03 in wallet_stmt2channel wallet/wallet.c:1483:9 #3 0x81f396 in wallet_channels_load_active wallet/wallet.c:1749:23 #4 0x81f03d in wallet_init_channels wallet/wallet.c:1765:9 #5 0x72f1f9 in load_channels_from_wallet lightningd/peer_control.c:2257:7 #6 0x672856 in main lightningd/lightningd.c:1121:25
cdecker
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Jun 7, 2023
Fixes nullability errors detected by UBSan:
wire/fromwire.c:173:46: runtime error: null pointer passed as argument 1, which is declared to never be null
external/libwally-core/src/secp256k1/include/secp256k1.h:432:3: note: nonnull attribute specified here
#0 0x65214a in fromwire_secp256k1_ecdsa_signature wire/fromwire.c:173:6
#1 0x659500 in printwire_secp256k1_ecdsa_signature devtools/print_wire.c:331:1
#2 0x646ba2 in printwire_channel_update wire/peer_printgen.c:1900:7
#3 0x637182 in printpeer_wire_message wire/peer_printgen.c:128:11
#4 0x65a097 in main devtools/decodemsg.c:85:10
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