Zbigniew Jędrzejewski-Szmek
6bfb1daff1
We would log "(null):0: Failed to parse system call, ignoring: rseq" from log_syntax_internal() from log_syntax() from seccomp_parse_syscall_filter_full() from seccomp_parse_syscall_filter() from config_parse_syscall_filter(), when generating the built-in @default whitelist. Since it was not based on the unit file, we would not pass a file name. So let's make sure that log_syntax() does not print "(null)" pointer (which is iffy and ugly), and use the unit name as fallback or nothing if both are missing. In principle, one of the two should be always available, since why use log_syntax() otherwise, but let's make things more resilient by guarding against this case too. log_syntax() is called from a thousand places, and often in error path, so it's hard to verify all callers.
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