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tracing: Avoid string overflow 

'err' is used as a NUL-terminated string, but using strncpy() with the length
equal to the buffer size may result in lack of the termination:

kernel/trace/trace_events_hist.c: In function 'hist_err_event':
kernel/trace/trace_events_hist.c:396:3: error: 'strncpy' specified bound 256 equals destination size [-Werror=stringop-truncation]
   strncpy(err, var, MAX_FILTER_STR_VAL);

This changes it to use the safer strscpy() instead.

Link: http://lkml.kernel.org/r/20180328140920.2842153-1-arnd@arndb.de

Cc: stable@vger.kernel.org
Fixes: f404da6e1d ("tracing: Add 'last error' error facility for hist triggers")
Acked-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Arnd Bergmann 2018-03-28 16:09:10 +02:00 committed by Steven Rostedt (VMware)
parent 021c91791a
commit cf4d418e65
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_events_hist.c
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@ -393,7 +393,7 @@ static void hist_err_event(char *str, char *system, char *event, char *var)
else if (system) else if (system)
snprintf(err, MAX_FILTER_STR_VAL, "%s.%s", system, event); snprintf(err, MAX_FILTER_STR_VAL, "%s.%s", system, event);
else else
strncpy(err, var, MAX_FILTER_STR_VAL); strscpy(err, var, MAX_FILTER_STR_VAL);
hist_err(str, err); hist_err(str, err);
} }