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allocator_thread.c: set O_CLOEXEC/FD_CLOEXEC for pipes, fix #273.

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In proxychains, we create pipes and use them internally.
If exec() is called by the program we run, the pipes opened
previously are never closed, causing a file descriptor leak
may eventually crash the program.

This commit calls fcntl() to set FD_CLOEXEC flags on pipes.
AFAIK there's no race condition on pipe creation, but we still
prefer to call the newer pipe2() with O_CLOEXEC if it's supported
by the system, due to its advantage of atomic operation, which
prevents potential race conditions in the future.

Signed-off-by: Tom Li <tomli@tomli.me>
This commit is contained in:
Tom Li 2018-12-25 23:22:48 +08:00 committed by rofl0r
parent db5cd6b699
commit 11988579f5
1 changed files with 12 additions and 1 deletions
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13
src/allocator_thread.c
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@ -309,7 +309,18 @@ size_t at_get_host_for_ip(ip_type4 ip, char* readbuf) {
static void initpipe(int* fds) {
if(pipe(fds) == -1) {
int retval;
#ifdef HAVE_PIPE2
retval = pipe2(fds, O_CLOEXEC);
#else
retval = pipe(fds);
if(retval == 0) {
fcntl(fds[0], F_SETFD, FD_CLOEXEC);
fcntl(fds[1], F_SETFD, FD_CLOEXEC);
}
#endif
if(retval == -1) {
perror("pipe");
exit(1);
}