[sudo-workers] SIGINT signal before exec
aurel at aurel-r.fr
Wed Feb 1 16:19:43 MST 2017
I'm developping a PAM module for sudo and I would like to be able to catch the
SIGINT signal from the shell (Ctrl-c) before exec. (Because my module can take
some time to end)
I know some suid authentication apps block signals (like 'su', user can't
Ctrl-c during the password prompt), as it seems the case in sudo (after
password prompt and until command exec).
I have tried to unblock the SIGINT signal from my module, but it doesn't seem
to work. If I understood properly, sudo block signals sent by the kernel ?
(When app is running or before too ?) How I can unblock (and reset after use)
these signals ?
What I have tried for the moment: (simplified code)
struct sigaction sa;
sa.sa_flags = 0;
sa.sa_handler = sigint_handler;
sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
sigaction(SIGINT, &sa, NULL);
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