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Close all open FDs before exec in Unix software update code.

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This commit is contained in:
Adam Ierymenko 2017-03-07 09:26:27 -08:00
parent 3859533e73
commit 1d2cb867b2
1 changed files with 21 additions and 0 deletions
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21
service/SoftwareUpdater.cpp
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@ -392,6 +392,9 @@ void SoftwareUpdater::apply()
memset(&si,0,sizeof(si));
memset(&pi,0,sizeof(pi));
CreateProcessA(NULL,const_cast<LPSTR>(updatePath.c_str()),NULL,NULL,FALSE,CREATE_NO_WINDOW|CREATE_NEW_PROCESS_GROUP,NULL,NULL,&si,&pi);
// Windows doesn't exit here -- updater will stop the service during update, etc. -- but we do want to stop multiple runs from happening
_latestMeta = nlohmann::json();
_latestValid = false;
#else
char *argv[256];
unsigned long ac = 0;
@ -403,7 +406,25 @@ void SoftwareUpdater::apply()
}
argv[ac] = (char *)0;
chmod(updatePath.c_str(),0700);
// Close all open file descriptors except stdout/stderr/etc.
int minMyFd = STDIN_FILENO;
if (STDOUT_FILENO > minMyFd) minMyFd = STDOUT_FILENO;
if (STDERR_FILENO > minMyFd) minMyFd = STDERR_FILENO;
++minMyFd;
#ifdef _SC_OPEN_MAX
int maxMyFd = (int)sysconf(_SC_OPEN_MAX);
if (maxMyFd <= minMyFd)
maxMyFd = 65536;
#else
int maxMyFd = 65536;
#endif
while (minMyFd < maxMyFd)
close(minMyFd++);
execv(updatePath.c_str(),argv);
fprintf(stderr,"FATAL: unable to execute software update binary at %s\n",updatePath.c_str());
exit(1);
#endif
}
}