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vm/qrexec: fix race between child cleanup and select call

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reap_children() can close FD, which was already added to FD_SET for select.
This can lead to EBADF and agent termination.
This commit is contained in:
Marek Marczykowski 2012-08-27 00:20:25 +02:00
parent 9519d843d8
commit d172fa72f1
1 changed files with 3 additions and 3 deletions
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6
qrexec/qrexec_agent.c
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@ -554,14 +554,14 @@ int main()
for (;;) {
sigprocmask(SIG_BLOCK, &chld_set, NULL);
if (child_exited)
reap_children();
max = fill_fds_for_select(&rdset, &wrset);
if (buffer_space_vchan_ext() <=
sizeof(struct server_header))
FD_ZERO(&rdset);
sigprocmask(SIG_BLOCK, &chld_set, NULL);
if (child_exited)
reap_children();
wait_for_vchan_or_argfd(max, &rdset, &wrset);
sigprocmask(SIG_UNBLOCK, &chld_set, NULL);