This is a note to let you know that I've just added the patch titled
tracing: Use str_has_prefix() instead of using fixed sizes
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tracing-use-str_has_prefix-instead-of-using-fixed-sizes.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From stable+bounces-43485-greg=kroah.com@xxxxxxxxxxxxxxx Thu May 9 04:30:44 2024
From: George Guo <dongtai.guo@xxxxxxxxx>
Date: Thu, 9 May 2024 10:29:26 +0800
Subject: tracing: Use str_has_prefix() instead of using fixed sizes
To: gregkh@xxxxxxxxxxxxxxxxxxx, rostedt@xxxxxxxxxxx, mhiramat@xxxxxxxxxx, tom.zanussi@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx, Namhyung Kim <namhyung@xxxxxxxxxx>, George Guo <guodongtai@xxxxxxxxxx>
Message-ID: <20240509022931.3513365-9-dongtai.guo@xxxxxxxxx>
From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>
commit b6b2735514bcd70ad1556a33892a636b20ece671 upstream.
There are several instances of strncmp(str, "const", 123), where 123 is the
strlen of the const string to check if "const" is the prefix of str. But
this can be error prone. Use str_has_prefix() instead.
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: George Guo <guodongtai@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace.c | 2 +-
kernel/trace/trace_events.c | 2 +-
kernel/trace/trace_events_hist.c | 2 +-
kernel/trace/trace_probe.c | 2 +-
kernel/trace/trace_stack.c | 2 +-
5 files changed, 5 insertions(+), 5 deletions(-)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4470,7 +4470,7 @@ static int trace_set_options(struct trac
cmp = strstrip(option);
- if (strncmp(cmp, "no", 2) == 0) {
+ if (str_has_prefix(cmp, "no")) {
neg = 1;
cmp += 2;
}
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1249,7 +1249,7 @@ static int f_show(struct seq_file *m, vo
*/
array_descriptor = strchr(field->type, '[');
- if (!strncmp(field->type, "__data_loc", 10))
+ if (str_has_prefix(field->type, "__data_loc"))
array_descriptor = NULL;
if (!array_descriptor)
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -484,7 +484,7 @@ static int synth_event_define_fields(str
static bool synth_field_signed(char *type)
{
- if (strncmp(type, "u", 1) == 0)
+ if (str_has_prefix(type, "u"))
return false;
if (strcmp(type, "gfp_t") == 0)
return false;
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -342,7 +342,7 @@ static int parse_probe_vars(char *arg, c
f->fn = t->fetch[FETCH_MTD_retval];
else
ret = -EINVAL;
- } else if (strncmp(arg, "stack", 5) == 0) {
+ } else if (str_has_prefix(arg, "stack")) {
if (arg[5] == '\0') {
if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR))
return -EINVAL;
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -453,7 +453,7 @@ static char stack_trace_filter_buf[COMMA
static __init int enable_stacktrace(char *str)
{
- if (strncmp(str, "_filter=", 8) == 0)
+ if (str_has_prefix(str, "_filter="))
strncpy(stack_trace_filter_buf, str+8, COMMAND_LINE_SIZE);
stack_tracer_enabled = 1;
Patches currently in stable-queue which might be from kroah.com@xxxxxxxxxxxxxxx are
queue-4.19/tracing-consolidate-trace_add-remove_event_call-back-to-the-nolock-functions.patch
queue-4.19/tracing-split-up-onmatch-action-data.patch
queue-4.19/tracing-remove-unnecessary-var_ref-destroy-in-track_data_destroy.patch
queue-4.19/tracing-use-str_has_prefix-helper-for-histogram-code.patch
queue-4.19/tracing-simplify-creation-and-deletion-of-synthetic-events.patch
queue-4.19/tracing-refactor-hist-trigger-action-code.patch
queue-4.19/string.h-add-str_has_prefix-helper-function.patch
queue-4.19/tracing-remove-unneeded-synth_event_mutex.patch
queue-4.19/tracing-add-unified-dynamic-event-framework.patch
queue-4.19/tracing-use-dyn_event-framework-for-synthetic-events.patch
queue-4.19/tracing-use-str_has_prefix-instead-of-using-fixed-sizes.patch
queue-4.19/tracing-generalize-hist-trigger-onmax-and-save-action.patch
queue-4.19/tracing-have-the-historgram-use-the-result-of-str_has_prefix-for-len-of-prefix.patch
