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bpfilter: Specify the log level for the kmsg message

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[ Upstream commit a196fa78a26571359740f701cf30d774eb8a72cb ]

Per the kmsg document [0], if we don't specify the log level with a
prefix "<N>" in the message string, the default log level will be
applied to the message. Since the default level could be warning(4),
this would make the log utility such as journalctl treat the message,
"Started bpfilter", as a warning. To avoid confusion, this commit
adds the prefix "<5>" to make the message always a notice.

  [0] https://www.kernel.org/doc/Documentation/ABI/testing/dev-kmsg

Fixes: 36c4357c63 ("net: bpfilter: print umh messages to /dev/kmsg")
Reported-by: Martin Loviska <mloviska@suse.com>
Signed-off-by: Gary Lin <glin@suse.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Dmitrii Banshchikov <me@ubique.spb.ru>
Link: https://lore.kernel.org/bpf/20210623040918.8683-1-glin@suse.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gary Lin 2021-06-23 12:09:18 +08:00 committed by Greg Kroah-Hartman
parent 4228c00e14
commit fc2ea819b9
1 changed files with 1 additions and 1 deletions
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2
net/bpfilter/main.c
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@ -57,7 +57,7 @@ int main(void)
{ {
debug_f = fopen("/dev/kmsg", "w"); debug_f = fopen("/dev/kmsg", "w");
setvbuf(debug_f, 0, _IOLBF, 0); setvbuf(debug_f, 0, _IOLBF, 0);
fprintf(debug_f, "Started bpfilter\n"); fprintf(debug_f, "<5>Started bpfilter\n");
loop(); loop();
fclose(debug_f); fclose(debug_f);
return 0; return 0;