Add a check for devname() returning a fully-qualified pathname.
None of the devname() implementations do this today but you never know when this might change.
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@@ -479,12 +479,15 @@ get_process_tty(void)
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sudo_debug_printf(SUDO_DEBUG_WARN,
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"unable to map device number %u to name",
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ki_proc->sudo_kp_tdev);
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} else {
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} else if (*dev != '/') {
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/* devname() doesn't use the /dev/ prefix, add one... */
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size_t len = sizeof(_PATH_DEV) + strlen(dev);
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tty = emalloc(len);
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strlcpy(tty, _PATH_DEV, len);
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strlcat(tty, dev, len);
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} else {
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/* Should not happen but just in case... */
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tty = estrdup(dev);
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}
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} else {
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sudo_debug_printf(SUDO_DEBUG_WARN,
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