diff options
author | João Barbosa <joao.paulo.barbosa@gmail.com> | 2020-04-01 00:22:14 +0100 |
---|---|---|
committer | João Barbosa <joao.paulo.barbosa@gmail.com> | 2020-04-02 17:25:27 +0100 |
commit | 7b8e15728d1ad058a4b7d7569fd5d5ba6806ca28 (patch) | |
tree | 6b190400bc7250fe03d24b7231d1b7efe730c9af /src | |
parent | d2db25233cf0dd1d2668a4aafc4fc94c47c11849 (diff) | |
download | bitcoin-7b8e15728d1ad058a4b7d7569fd5d5ba6806ca28.tar.xz |
rpc: Fix rpcRunLater race in walletpassphrase
Diffstat (limited to 'src')
-rw-r--r-- | src/wallet/rpcwallet.cpp | 70 |
1 files changed, 39 insertions, 31 deletions
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp index 5d34e592db..03bfdb4a25 100644 --- a/src/wallet/rpcwallet.cpp +++ b/src/wallet/rpcwallet.cpp @@ -1918,44 +1918,52 @@ static UniValue walletpassphrase(const JSONRPCRequest& request) }, }.Check(request); - auto locked_chain = pwallet->chain().lock(); - LOCK(pwallet->cs_wallet); - - if (!pwallet->IsCrypted()) { - throw JSONRPCError(RPC_WALLET_WRONG_ENC_STATE, "Error: running with an unencrypted wallet, but walletpassphrase was called."); - } + int64_t nSleepTime; + { + auto locked_chain = pwallet->chain().lock(); + LOCK(pwallet->cs_wallet); - // Note that the walletpassphrase is stored in request.params[0] which is not mlock()ed - SecureString strWalletPass; - strWalletPass.reserve(100); - // TODO: get rid of this .c_str() by implementing SecureString::operator=(std::string) - // Alternately, find a way to make request.params[0] mlock()'d to begin with. - strWalletPass = request.params[0].get_str().c_str(); + if (!pwallet->IsCrypted()) { + throw JSONRPCError(RPC_WALLET_WRONG_ENC_STATE, "Error: running with an unencrypted wallet, but walletpassphrase was called."); + } - // Get the timeout - int64_t nSleepTime = request.params[1].get_int64(); - // Timeout cannot be negative, otherwise it will relock immediately - if (nSleepTime < 0) { - throw JSONRPCError(RPC_INVALID_PARAMETER, "Timeout cannot be negative."); - } - // Clamp timeout - constexpr int64_t MAX_SLEEP_TIME = 100000000; // larger values trigger a macos/libevent bug? - if (nSleepTime > MAX_SLEEP_TIME) { - nSleepTime = MAX_SLEEP_TIME; - } + // Note that the walletpassphrase is stored in request.params[0] which is not mlock()ed + SecureString strWalletPass; + strWalletPass.reserve(100); + // TODO: get rid of this .c_str() by implementing SecureString::operator=(std::string) + // Alternately, find a way to make request.params[0] mlock()'d to begin with. + strWalletPass = request.params[0].get_str().c_str(); + + // Get the timeout + nSleepTime = request.params[1].get_int64(); + // Timeout cannot be negative, otherwise it will relock immediately + if (nSleepTime < 0) { + throw JSONRPCError(RPC_INVALID_PARAMETER, "Timeout cannot be negative."); + } + // Clamp timeout + constexpr int64_t MAX_SLEEP_TIME = 100000000; // larger values trigger a macos/libevent bug? + if (nSleepTime > MAX_SLEEP_TIME) { + nSleepTime = MAX_SLEEP_TIME; + } - if (strWalletPass.empty()) { - throw JSONRPCError(RPC_INVALID_PARAMETER, "passphrase can not be empty"); - } + if (strWalletPass.empty()) { + throw JSONRPCError(RPC_INVALID_PARAMETER, "passphrase can not be empty"); + } - if (!pwallet->Unlock(strWalletPass)) { - throw JSONRPCError(RPC_WALLET_PASSPHRASE_INCORRECT, "Error: The wallet passphrase entered was incorrect."); - } + if (!pwallet->Unlock(strWalletPass)) { + throw JSONRPCError(RPC_WALLET_PASSPHRASE_INCORRECT, "Error: The wallet passphrase entered was incorrect."); + } - pwallet->TopUpKeyPool(); + pwallet->TopUpKeyPool(); - pwallet->nRelockTime = GetTime() + nSleepTime; + pwallet->nRelockTime = GetTime() + nSleepTime; + } + // rpcRunLater must be called without cs_wallet held otherwise a deadlock + // can occur. The deadlock would happen when RPCRunLater removes the + // previous timer (and waits for the callback to finish if already running) + // and the callback locks cs_wallet. + AssertLockNotHeld(wallet->cs_wallet); // Keep a weak pointer to the wallet so that it is possible to unload the // wallet before the following callback is called. If a valid shared pointer // is acquired in the callback then the wallet is still loaded. |