commit 329216253fb40108f8d713fb0299eb326e9b28fe Author: Kathy Brade brade@pearlcrescent.com Date: Thu Apr 21 10:40:26 2016 -0400

Bug 18800: Remove localhost DNS lookup in nsProfileLock.cpp

Instead of using the local computer's IP address within symlink-based profile lock signatures, always use 127.0.0.1. --- toolkit/profile/nsProfileLock.cpp | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/toolkit/profile/nsProfileLock.cpp b/toolkit/profile/nsProfileLock.cpp index 25c4f5a79e56..1942815e3446 100644 --- a/toolkit/profile/nsProfileLock.cpp +++ b/toolkit/profile/nsProfileLock.cpp @@ -289,18 +289,17 @@ nsresult nsProfileLock::LockWithSymlink(nsIFile* aLockFile, if (!mReplacedLockTime) aLockFile->GetLastModifiedTimeOfLink(&mReplacedLockTime);

+ // For Tor Browser, avoid a DNS lookup here so the Tor network is not + // bypassed. Instead, always use 127.0.0.1 for the IP address portion + // of the lock signature, which may cause the browser to refuse to + // start in the rare event that all of the following conditions are met: + // 1. The browser profile is on a network file system. + // 2. The file system does not support fcntl() locking. + // 3. Tor Browser is run from two different computers at the same time. + struct in_addr inaddr; inaddr.s_addr = htonl(INADDR_LOOPBACK);

- char hostname[256]; - PRStatus status = PR_GetSystemInfo(PR_SI_HOSTNAME, hostname, sizeof hostname); - if (status == PR_SUCCESS) { - char netdbbuf[PR_NETDB_BUF_SIZE]; - PRHostEnt hostent; - status = PR_GetHostByName(hostname, netdbbuf, sizeof netdbbuf, &hostent); - if (status == PR_SUCCESS) memcpy(&inaddr, hostent.h_addr, sizeof inaddr); - } - mozilla::SmprintfPointer signature = mozilla::Smprintf("%s:%s%lu", inet_ntoa(inaddr), aHaveFcntlLock ? "+" : "", (unsigned long)getpid());