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Message-ID: <66e8f990e649678e4be37d4d1a19158ca0dea2f4.1741521295.git.christophe.jaillet@wanadoo.fr>
Date: Sun, 9 Mar 2025 12:56:06 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
linux-trace-kernel@...r.kernel.org
Subject: [PATCH] tracing: Constify struct event_trigger_ops
'event_trigger_ops mwifiex_if_ops' are not modified in these drivers.
Constifying these structures moves some data to a read-only section, so
increase overall security, especially when the structure holds some
function pointers.
On a x86_64, with allmodconfig, as an example:
Before:
======
text data bss dec hex filename
31368 9024 6200 46592 b600 kernel/trace/trace_events_trigger.o
After:
=====
text data bss dec hex filename
31752 8608 6200 46560 b5e0 kernel/trace/trace_events_trigger.o
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Compile tested-only.
---
kernel/trace/trace.h | 4 +--
kernel/trace/trace_eprobe.c | 6 ++---
kernel/trace/trace_events_hist.c | 20 +++++++--------
kernel/trace/trace_events_trigger.c | 38 ++++++++++++++---------------
4 files changed, 34 insertions(+), 34 deletions(-)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 5307daa2dacb..abab9442ac0e 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1718,7 +1718,7 @@ struct event_trigger_data {
unsigned long count;
int ref;
int flags;
- struct event_trigger_ops *ops;
+ const struct event_trigger_ops *ops;
struct event_command *cmd_ops;
struct event_filter __rcu *filter;
char *filter_str;
@@ -1963,7 +1963,7 @@ struct event_command {
int (*set_filter)(char *filter_str,
struct event_trigger_data *data,
struct trace_event_file *file);
- struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
+ const struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
};
/**
diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
index af9fa0632b57..c08355c3ef32 100644
--- a/kernel/trace/trace_eprobe.c
+++ b/kernel/trace/trace_eprobe.c
@@ -478,7 +478,7 @@ static void eprobe_trigger_func(struct event_trigger_data *data,
__eprobe_trace_func(edata, rec);
}
-static struct event_trigger_ops eprobe_trigger_ops = {
+static const struct event_trigger_ops eprobe_trigger_ops = {
.trigger = eprobe_trigger_func,
.print = eprobe_trigger_print,
.init = eprobe_trigger_init,
@@ -507,8 +507,8 @@ static void eprobe_trigger_unreg_func(char *glob,
}
-static struct event_trigger_ops *eprobe_trigger_get_ops(char *cmd,
- char *param)
+static const struct event_trigger_ops *eprobe_trigger_get_ops(char *cmd,
+ char *param)
{
return &eprobe_trigger_ops;
}
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index ad7419e24055..0a962e929243 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -6191,7 +6191,7 @@ static void event_hist_trigger_free(struct event_trigger_data *data)
}
}
-static struct event_trigger_ops event_hist_trigger_ops = {
+static const struct event_trigger_ops event_hist_trigger_ops = {
.trigger = event_hist_trigger,
.print = event_hist_trigger_print,
.init = event_hist_trigger_init,
@@ -6223,15 +6223,15 @@ static void event_hist_trigger_named_free(struct event_trigger_data *data)
}
}
-static struct event_trigger_ops event_hist_trigger_named_ops = {
+static const struct event_trigger_ops event_hist_trigger_named_ops = {
.trigger = event_hist_trigger,
.print = event_hist_trigger_print,
.init = event_hist_trigger_named_init,
.free = event_hist_trigger_named_free,
};
-static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
- char *param)
+static const struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
+ char *param)
{
return &event_hist_trigger_ops;
}
@@ -6826,38 +6826,38 @@ hist_enable_count_trigger(struct event_trigger_data *data,
hist_enable_trigger(data, buffer, rec, event);
}
-static struct event_trigger_ops hist_enable_trigger_ops = {
+static const struct event_trigger_ops hist_enable_trigger_ops = {
.trigger = hist_enable_trigger,
.print = event_enable_trigger_print,
.init = event_trigger_init,
.free = event_enable_trigger_free,
};
-static struct event_trigger_ops hist_enable_count_trigger_ops = {
+static const struct event_trigger_ops hist_enable_count_trigger_ops = {
.trigger = hist_enable_count_trigger,
.print = event_enable_trigger_print,
.init = event_trigger_init,
.free = event_enable_trigger_free,
};
-static struct event_trigger_ops hist_disable_trigger_ops = {
+static const struct event_trigger_ops hist_disable_trigger_ops = {
.trigger = hist_enable_trigger,
.print = event_enable_trigger_print,
.init = event_trigger_init,
.free = event_enable_trigger_free,
};
-static struct event_trigger_ops hist_disable_count_trigger_ops = {
+static const struct event_trigger_ops hist_disable_count_trigger_ops = {
.trigger = hist_enable_count_trigger,
.print = event_enable_trigger_print,
.init = event_trigger_init,
.free = event_enable_trigger_free,
};
-static struct event_trigger_ops *
+static const struct event_trigger_ops *
hist_enable_get_trigger_ops(char *cmd, char *param)
{
- struct event_trigger_ops *ops;
+ const struct event_trigger_ops *ops;
bool enable;
enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index d45448947094..b66b6d235d91 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -825,7 +825,7 @@ struct event_trigger_data *event_trigger_alloc(struct event_command *cmd_ops,
void *private_data)
{
struct event_trigger_data *trigger_data;
- struct event_trigger_ops *trigger_ops;
+ const struct event_trigger_ops *trigger_ops;
trigger_ops = cmd_ops->get_trigger_ops(cmd, param);
@@ -1367,38 +1367,38 @@ traceoff_trigger_print(struct seq_file *m, struct event_trigger_data *data)
data->filter_str);
}
-static struct event_trigger_ops traceon_trigger_ops = {
+static const struct event_trigger_ops traceon_trigger_ops = {
.trigger = traceon_trigger,
.print = traceon_trigger_print,
.init = event_trigger_init,
.free = event_trigger_free,
};
-static struct event_trigger_ops traceon_count_trigger_ops = {
+static const struct event_trigger_ops traceon_count_trigger_ops = {
.trigger = traceon_count_trigger,
.print = traceon_trigger_print,
.init = event_trigger_init,
.free = event_trigger_free,
};
-static struct event_trigger_ops traceoff_trigger_ops = {
+static const struct event_trigger_ops traceoff_trigger_ops = {
.trigger = traceoff_trigger,
.print = traceoff_trigger_print,
.init = event_trigger_init,
.free = event_trigger_free,
};
-static struct event_trigger_ops traceoff_count_trigger_ops = {
+static const struct event_trigger_ops traceoff_count_trigger_ops = {
.trigger = traceoff_count_trigger,
.print = traceoff_trigger_print,
.init = event_trigger_init,
.free = event_trigger_free,
};
-static struct event_trigger_ops *
+static const struct event_trigger_ops *
onoff_get_trigger_ops(char *cmd, char *param)
{
- struct event_trigger_ops *ops;
+ const struct event_trigger_ops *ops;
/* we register both traceon and traceoff to this callback */
if (strcmp(cmd, "traceon") == 0)
@@ -1491,21 +1491,21 @@ snapshot_trigger_print(struct seq_file *m, struct event_trigger_data *data)
data->filter_str);
}
-static struct event_trigger_ops snapshot_trigger_ops = {
+static const struct event_trigger_ops snapshot_trigger_ops = {
.trigger = snapshot_trigger,
.print = snapshot_trigger_print,
.init = event_trigger_init,
.free = event_trigger_free,
};
-static struct event_trigger_ops snapshot_count_trigger_ops = {
+static const struct event_trigger_ops snapshot_count_trigger_ops = {
.trigger = snapshot_count_trigger,
.print = snapshot_trigger_print,
.init = event_trigger_init,
.free = event_trigger_free,
};
-static struct event_trigger_ops *
+static const struct event_trigger_ops *
snapshot_get_trigger_ops(char *cmd, char *param)
{
return param ? &snapshot_count_trigger_ops : &snapshot_trigger_ops;
@@ -1586,21 +1586,21 @@ stacktrace_trigger_print(struct seq_file *m, struct event_trigger_data *data)
data->filter_str);
}
-static struct event_trigger_ops stacktrace_trigger_ops = {
+static const struct event_trigger_ops stacktrace_trigger_ops = {
.trigger = stacktrace_trigger,
.print = stacktrace_trigger_print,
.init = event_trigger_init,
.free = event_trigger_free,
};
-static struct event_trigger_ops stacktrace_count_trigger_ops = {
+static const struct event_trigger_ops stacktrace_count_trigger_ops = {
.trigger = stacktrace_count_trigger,
.print = stacktrace_trigger_print,
.init = event_trigger_init,
.free = event_trigger_free,
};
-static struct event_trigger_ops *
+static const struct event_trigger_ops *
stacktrace_get_trigger_ops(char *cmd, char *param)
{
return param ? &stacktrace_count_trigger_ops : &stacktrace_trigger_ops;
@@ -1711,28 +1711,28 @@ void event_enable_trigger_free(struct event_trigger_data *data)
}
}
-static struct event_trigger_ops event_enable_trigger_ops = {
+static const struct event_trigger_ops event_enable_trigger_ops = {
.trigger = event_enable_trigger,
.print = event_enable_trigger_print,
.init = event_trigger_init,
.free = event_enable_trigger_free,
};
-static struct event_trigger_ops event_enable_count_trigger_ops = {
+static const struct event_trigger_ops event_enable_count_trigger_ops = {
.trigger = event_enable_count_trigger,
.print = event_enable_trigger_print,
.init = event_trigger_init,
.free = event_enable_trigger_free,
};
-static struct event_trigger_ops event_disable_trigger_ops = {
+static const struct event_trigger_ops event_disable_trigger_ops = {
.trigger = event_enable_trigger,
.print = event_enable_trigger_print,
.init = event_trigger_init,
.free = event_enable_trigger_free,
};
-static struct event_trigger_ops event_disable_count_trigger_ops = {
+static const struct event_trigger_ops event_disable_count_trigger_ops = {
.trigger = event_enable_count_trigger,
.print = event_enable_trigger_print,
.init = event_trigger_init,
@@ -1916,10 +1916,10 @@ void event_enable_unregister_trigger(char *glob,
data->ops->free(data);
}
-static struct event_trigger_ops *
+static const struct event_trigger_ops *
event_enable_get_trigger_ops(char *cmd, char *param)
{
- struct event_trigger_ops *ops;
+ const struct event_trigger_ops *ops;
bool enable;
#ifdef CONFIG_HIST_TRIGGERS
--
2.48.1
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