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tracing: Fix synth event printk format for str fields

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The printk format for synth event uses "%.*s" to print string fields,
but then only passes the pointer part as var arg.

Replace %.*s with %s as the C string is guaranteed to be null-terminated.

The output in print fmt should never have been updated as __get_str()
handles the string limit because it can access the length of the string in
the string meta data that is saved in the ring buffer.

Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Fixes: 8db4d6bfbb ("tracing: Change synthetic event string format to limit printed length")
Link: https://lore.kernel.org/20250325165202.541088-1-douglas.raillard@arm.com
Signed-off-by: Douglas Raillard <douglas.raillard@arm.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Douglas Raillard 2025-03-25 16:52:02 +00:00 committed by Steven Rostedt (Google)
parent 8eb1518642
commit 4d38328eb4
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_events_synth.c
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@ -305,7 +305,7 @@ static const char *synth_field_fmt(char *type)
else if (strcmp(type, "gfp_t") == 0) else if (strcmp(type, "gfp_t") == 0)
fmt = "%x"; fmt = "%x";
else if (synth_field_is_string(type)) else if (synth_field_is_string(type))
fmt = "%.*s"; fmt = "%s";
else if (synth_field_is_stack(type)) else if (synth_field_is_stack(type))
fmt = "%s"; fmt = "%s";