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tracing: Use trace_seq_used() and seq_buf_used() instead of len

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As the seq_buf->len will soon be +1 size when there's an overflow, we
must use trace_seq_used() or seq_buf_used() methods to get the real
length. This will prevent buffer overflow issues if just the len
of the seq_buf descriptor is used to copy memory.

Link: http://lkml.kernel.org/r/20141114121911.09ba3d38@gandalf.local.home

Reported-by: Petr Mladek <pmladek@suse.cz>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
2014-11-14 15:49:41 -05:00
committed by Steven Rostedt
parent 74f06bb723
commit 5ac4837841
6 changed files with 42 additions and 17 deletions
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5
kernel/trace/trace_functions_graph.c
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@@ -1153,6 +1153,9 @@ print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
return ret;
}
if (trace_seq_has_overflowed(s))
goto out;
/* Strip ending newline */
if (s->buffer[s->seq.len - 1] == '\n') {
s->buffer[s->seq.len - 1] = '\0';
@@ -1160,7 +1163,7 @@ print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
}
trace_seq_puts(s, " */\n");
out:
return trace_handle_return(s);
}