>Side note: we discovered that Ubuntu 24.04 does not re-randomize the
ASLR of its sshd children (it is randomized only once, at boot time); we
tracked this down to the patch below, which turns off sshd's rexec_flag.
This is generally a bad idea, but in the particular case of this signal
handler race condition, it prevents sshd from being exploitable: the
syslog() inside the SIGALRM handler does not call any of the malloc
functions, because it is never the very first call to syslog().
