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spawn: close all file descriptors before execve

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No need to give whatever we're calling access to what we use
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moneromooo-monero 2018-10-16 18:08:36 +00:00
parent 5c85da5a73
commit c774392985
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3 changed files with 25 additions and 0 deletions
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20
src/common/util.cpp
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@ -28,6 +28,7 @@
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
#include <unistd.h>
#include <cstdio>
#ifdef __GLIBC__
@ -967,4 +968,23 @@ std::string get_nix_version_display_string()
}
#endif
void closefrom(int fd)
{
#if defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__ || defined __DragonFly__
::closefrom(fd);
#else
#if defined __GLIBC__
const int sc_open_max = sysconf(_SC_OPEN_MAX);
const int MAX_FDS = std::min(65536, sc_open_max);
#else
const int MAX_FDS = 65536;
#endif
while (fd < MAX_FDS)
{
close(fd);
++fd;
}
#endif
}
}