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SUNRPC: Fix rpcgss_context trace event acceptor field 

commit a4833e3aba upstream.

The rpcgss_context trace event acceptor field is a dynamically sized
string that records the "data" parameter. But this parameter is also
dependent on the "len" field to determine the size of the data.

It needs to use __string_len() helper macro where the length can be passed
in. It also incorrectly uses strncpy() to save it instead of
__assign_str(). As these macros can change, it is not wise to open code
them in trace events.

As of commit c759e60903 ("tracing: Remove __assign_str_len()"),
__assign_str() can be used for both __string() and __string_len() fields.
Before that commit, __assign_str_len() is required to be used. This needs
to be noted for backporting. (In actuality, commit c1fa617cae ("tracing:
Rework __assign_str() and __string() to not duplicate getting the string")
is the commit that makes __string_str_len() obsolete).

Cc: stable@vger.kernel.org
Fixes: 0c77668ddb ("SUNRPC: Introduce trace points in rpc_auth_gss.ko")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steven Rostedt (Google) 2024-04-10 12:38:13 -04:00 committed by Greg Kroah-Hartman
parent 2364d0278f
commit edfaf679b7
1 changed files with 2 additions and 2 deletions
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4
include/trace/events/rpcgss.h
View File

@ -587,7 +587,7 @@ TRACE_EVENT(rpcgss_context,
__field(unsigned int, timeout)
__field(u32, window_size)
__field(int, len)
__string(acceptor, data)
__string_len(acceptor, data, len)
),
TP_fast_assign(
@ -596,7 +596,7 @@ TRACE_EVENT(rpcgss_context,
__entry->timeout = timeout;
__entry->window_size = window_size;
__entry->len = len;
strncpy(__get_str(acceptor), data, len);
__assign_str(acceptor, data);
),
TP_printk("win_size=%u expiry=%lu now=%lu timeout=%u acceptor=%.*s",