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process: Don't close all FDs on new spawn

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Fixes #40990

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2024-12-03 10:16:26 -05:00
parent e5b51eb10f
commit 717b59ac2b
2 changed files with 8 additions and 6 deletions
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4
changes/ticket40990 Normal file
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@ -0,0 +1,4 @@
o Minor bugfix (process):
- Avoid closing all possible FDs when spawning a process (PT). On some systems, this could
lead to 3+ minutes hang. Fixes bug 40990; bugfix on 0.3.5.1-alpha.

10
src/lib/process/process_unix.c
View file

@ -137,7 +137,7 @@ process_unix_exec(process_t *process)
int stdin_pipe[2];
int stdout_pipe[2];
int stderr_pipe[2];
int retval, fd;
int retval;
unix_process = process_get_unix_process(process);
@ -240,11 +240,9 @@ process_unix_exec(process_t *process)
close(stdin_pipe[0]);
close(stdin_pipe[1]);
/* Close all other fds, including the read end of the pipe. XXX: We should
* now be doing enough FD_CLOEXEC setting to make this needless.
*/
for (fd = STDERR_FILENO + 1; fd < max_fd; fd++)
close(fd);
/* Note that we don't close all FDs from here, which we used to do, because
* all our open are CLOEXEC. With a very large maximum number of FDs, the
* loop was taking a long time: #40990 */
/* Create the argv value for our new process. */
char **argv = process_get_argv(process);