[PATCH] kernel: move from strlcpy with unused retval to strscpy

From: Wolfram Sang
Date: Thu Aug 18 2022 - 17:12:55 EST

Follow the advice of the below link and prefer 'strscpy' in this
subsystem. Conversion is 1:1 because the return value is not used.
Generated by a coccinelle script.

Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@xxxxxxxxxxxxxx/
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
kernel/acct.c | 2 +-
kernel/bpf/preload/bpf_preload_kern.c | 4 ++--
kernel/cgroup/cgroup-v1.c | 4 ++--
kernel/events/core.c | 6 +++---
kernel/kallsyms.c | 4 ++--
kernel/params.c | 2 +-
kernel/printk/printk.c | 2 +-
kernel/relay.c | 4 ++--
kernel/time/clocksource.c | 2 +-
kernel/trace/ftrace.c | 18 +++++++++---------
kernel/trace/trace.c | 8 ++++----
kernel/trace/trace_events.c | 2 +-
kernel/trace/trace_events_inject.c | 4 ++--
kernel/trace/trace_kprobe.c | 2 +-
kernel/trace/trace_probe.c | 2 +-
15 files changed, 33 insertions(+), 33 deletions(-)

diff --git a/kernel/acct.c b/kernel/acct.c
index 13706356ec54..5ee0b37acf0c 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -443,7 +443,7 @@ static void fill_ac(acct_t *ac)
memset(ac, 0, sizeof(acct_t));

ac->ac_version = ACCT_VERSION | ACCT_BYTEORDER;
- strlcpy(ac->ac_comm, current->comm, sizeof(ac->ac_comm));
+ strscpy(ac->ac_comm, current->comm, sizeof(ac->ac_comm));

/* calculate run_time in nsec*/
run_time = ktime_get_ns();
diff --git a/kernel/bpf/preload/bpf_preload_kern.c b/kernel/bpf/preload/bpf_preload_kern.c
index 5106b5372f0c..af8dd3a7c928 100644
--- a/kernel/bpf/preload/bpf_preload_kern.c
+++ b/kernel/bpf/preload/bpf_preload_kern.c
@@ -19,9 +19,9 @@ static void free_links_and_skel(void)

static int preload(struct bpf_preload_info *obj)
{
- strlcpy(obj[0].link_name, "maps.debug", sizeof(obj[0].link_name));
+ strscpy(obj[0].link_name, "maps.debug", sizeof(obj[0].link_name));
obj[0].link = maps_link;
- strlcpy(obj[1].link_name, "progs.debug", sizeof(obj[1].link_name));
+ strscpy(obj[1].link_name, "progs.debug", sizeof(obj[1].link_name));
obj[1].link = progs_link;
return 0;
}
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 2ade21b54dc4..ce8bcd2d014a 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -563,7 +563,7 @@ static ssize_t cgroup_release_agent_write(struct kernfs_open_file *of,
if (!cgrp)
return -ENODEV;
spin_lock(&release_agent_path_lock);
- strlcpy(cgrp->root->release_agent_path, strstrip(buf),
+ strscpy(cgrp->root->release_agent_path, strstrip(buf),
sizeof(cgrp->root->release_agent_path));
spin_unlock(&release_agent_path_lock);
cgroup_kn_unlock(of->kn);
@@ -797,7 +797,7 @@ void cgroup1_release_agent(struct work_struct *work)
goto out_free;

spin_lock(&release_agent_path_lock);
- strlcpy(agentbuf, cgrp->root->release_agent_path, PATH_MAX);
+ strscpy(agentbuf, cgrp->root->release_agent_path, PATH_MAX);
spin_unlock(&release_agent_path_lock);
if (!agentbuf[0])
goto out_free;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 2621fd24ad26..7c785b64fa3d 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7954,7 +7954,7 @@ static void perf_event_comm_event(struct perf_comm_event *comm_event)
unsigned int size;

memset(comm, 0, sizeof(comm));
- strlcpy(comm, comm_event->task->comm, sizeof(comm));
+ strscpy(comm, comm_event->task->comm, sizeof(comm));
size = ALIGN(strlen(comm)+1, sizeof(u64));

comm_event->comm = comm;
@@ -8409,7 +8409,7 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
}

cpy_name:
- strlcpy(tmp, name, sizeof(tmp));
+ strscpy(tmp, name, sizeof(tmp));
name = tmp;
got_name:
/*
@@ -8838,7 +8838,7 @@ void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, bool unregister,
ksym_type == PERF_RECORD_KSYMBOL_TYPE_UNKNOWN)
goto err;

- strlcpy(name, sym, KSYM_NAME_LEN);
+ strscpy(name, sym, KSYM_NAME_LEN);
name_len = strlen(name) + 1;
while (!IS_ALIGNED(name_len, sizeof(u64)))
name[name_len++] = '\0';
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 3e7e2c2ad2f7..9a204432bf87 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -624,7 +624,7 @@ static int get_ksymbol_bpf(struct kallsym_iter *iter)
{
int ret;

- strlcpy(iter->module_name, "bpf", MODULE_NAME_LEN);
+ strscpy(iter->module_name, "bpf", MODULE_NAME_LEN);
iter->exported = 0;
ret = bpf_get_kallsym(iter->pos - iter->pos_ftrace_mod_end,
&iter->value, &iter->type,
@@ -644,7 +644,7 @@ static int get_ksymbol_bpf(struct kallsym_iter *iter)
*/
static int get_ksymbol_kprobe(struct kallsym_iter *iter)
{
- strlcpy(iter->module_name, "__builtin__kprobes", MODULE_NAME_LEN);
+ strscpy(iter->module_name, "__builtin__kprobes", MODULE_NAME_LEN);
iter->exported = 0;
return kprobe_get_kallsym(iter->pos - iter->pos_bpf_end,
&iter->value, &iter->type,
diff --git a/kernel/params.c b/kernel/params.c
index 5b92310425c5..ee2e3b674dd0 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -846,7 +846,7 @@ static void __init param_sysfs_builtin(void)
name_len = 0;
} else {
name_len = dot - kp->name + 1;
- strlcpy(modname, kp->name, name_len);
+ strscpy(modname, kp->name, name_len);
}
kernel_add_sysfs_param(modname, kp, name_len);
}
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index a1a81fd9889b..7b1ba087b629 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2392,7 +2392,7 @@ static int __add_preferred_console(char *name, int idx, char *options,
return -E2BIG;
if (!brl_options)
preferred_console = i;
- strlcpy(c->name, name, sizeof(c->name));
+ strscpy(c->name, name, sizeof(c->name));
c->options = options;
set_user_specified(c, user_specified);
braille_set_options(c, brl_options);
diff --git a/kernel/relay.c b/kernel/relay.c
index 6a611e779e95..e75bc76c8bfa 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -510,7 +510,7 @@ struct rchan *relay_open(const char *base_filename,
chan->private_data = private_data;
if (base_filename) {
chan->has_base_filename = 1;
- strlcpy(chan->base_filename, base_filename, NAME_MAX);
+ strscpy(chan->base_filename, base_filename, NAME_MAX);
}
chan->cb = cb;
kref_init(&chan->kref);
@@ -581,7 +581,7 @@ int relay_late_setup_files(struct rchan *chan,
if (!chan || !base_filename)
return -EINVAL;

- strlcpy(chan->base_filename, base_filename, NAME_MAX);
+ strscpy(chan->base_filename, base_filename, NAME_MAX);

mutex_lock(&relay_channels_mutex);
/* Is chan already set up? */
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index cee5da1e54c4..dc95af1fc8cd 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -1450,7 +1450,7 @@ static int __init boot_override_clocksource(char* str)
{
mutex_lock(&clocksource_mutex);
if (str)
- strlcpy(override_name, str, sizeof(override_name));
+ strscpy(override_name, str, sizeof(override_name));
mutex_unlock(&clocksource_mutex);
return 1;
}
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index bc921a3f7ea8..654cd8ca46b9 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5991,7 +5991,7 @@ bool ftrace_filter_param __initdata;
static int __init set_ftrace_notrace(char *str)
{
ftrace_filter_param = true;
- strlcpy(ftrace_notrace_buf, str, FTRACE_FILTER_SIZE);
+ strscpy(ftrace_notrace_buf, str, FTRACE_FILTER_SIZE);
return 1;
}
__setup("ftrace_notrace=", set_ftrace_notrace);
@@ -5999,7 +5999,7 @@ __setup("ftrace_notrace=", set_ftrace_notrace);
static int __init set_ftrace_filter(char *str)
{
ftrace_filter_param = true;
- strlcpy(ftrace_filter_buf, str, FTRACE_FILTER_SIZE);
+ strscpy(ftrace_filter_buf, str, FTRACE_FILTER_SIZE);
return 1;
}
__setup("ftrace_filter=", set_ftrace_filter);
@@ -6011,14 +6011,14 @@ static int ftrace_graph_set_hash(struct ftrace_hash *hash, char *buffer);

static int __init set_graph_function(char *str)
{
- strlcpy(ftrace_graph_buf, str, FTRACE_FILTER_SIZE);
+ strscpy(ftrace_graph_buf, str, FTRACE_FILTER_SIZE);
return 1;
}
__setup("ftrace_graph_filter=", set_graph_function);

static int __init set_graph_notrace_function(char *str)
{
- strlcpy(ftrace_graph_notrace_buf, str, FTRACE_FILTER_SIZE);
+ strscpy(ftrace_graph_notrace_buf, str, FTRACE_FILTER_SIZE);
return 1;
}
__setup("ftrace_graph_notrace=", set_graph_notrace_function);
@@ -6803,8 +6803,8 @@ static int ftrace_get_trampoline_kallsym(unsigned int symnum,
continue;
*value = op->trampoline;
*type = 't';
- strlcpy(name, FTRACE_TRAMPOLINE_SYM, KSYM_NAME_LEN);
- strlcpy(module_name, FTRACE_TRAMPOLINE_MOD, MODULE_NAME_LEN);
+ strscpy(name, FTRACE_TRAMPOLINE_SYM, KSYM_NAME_LEN);
+ strscpy(module_name, FTRACE_TRAMPOLINE_MOD, MODULE_NAME_LEN);
*exported = 0;
return 0;
}
@@ -7135,7 +7135,7 @@ ftrace_func_address_lookup(struct ftrace_mod_map *mod_map,
if (off)
*off = addr - found_func->ip;
if (sym)
- strlcpy(sym, found_func->name, KSYM_NAME_LEN);
+ strscpy(sym, found_func->name, KSYM_NAME_LEN);

return found_func->name;
}
@@ -7189,8 +7189,8 @@ int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value,

*value = mod_func->ip;
*type = 'T';
- strlcpy(name, mod_func->name, KSYM_NAME_LEN);
- strlcpy(module_name, mod_map->mod->name, MODULE_NAME_LEN);
+ strscpy(name, mod_func->name, KSYM_NAME_LEN);
+ strscpy(module_name, mod_map->mod->name, MODULE_NAME_LEN);
*exported = 1;
preempt_enable();
return 0;
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d3005279165d..98ce29d78110 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -189,7 +189,7 @@ static bool snapshot_at_boot;

static int __init set_cmdline_ftrace(char *str)
{
- strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE);
+ strscpy(bootup_tracer_buf, str, MAX_TRACER_SIZE);
default_bootup_tracer = bootup_tracer_buf;
/* We are using ftrace early, expand it */
ring_buffer_expanded = true;
@@ -244,7 +244,7 @@ static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata;

static int __init set_trace_boot_options(char *str)
{
- strlcpy(trace_boot_options_buf, str, MAX_TRACER_SIZE);
+ strscpy(trace_boot_options_buf, str, MAX_TRACER_SIZE);
return 1;
}
__setup("trace_options=", set_trace_boot_options);
@@ -254,7 +254,7 @@ static char *trace_boot_clock __initdata;

static int __init set_trace_boot_clock(char *str)
{
- strlcpy(trace_boot_clock_buf, str, MAX_TRACER_SIZE);
+ strscpy(trace_boot_clock_buf, str, MAX_TRACER_SIZE);
trace_boot_clock = trace_boot_clock_buf;
return 1;
}
@@ -2452,7 +2452,7 @@ static void __trace_find_cmdline(int pid, char comm[])
if (map != NO_CMDLINE_MAP) {
tpid = savedcmd->map_cmdline_to_pid[map];
if (tpid == pid) {
- strlcpy(comm, get_saved_cmdlines(map), TASK_COMM_LEN);
+ strscpy(comm, get_saved_cmdlines(map), TASK_COMM_LEN);
return;
}
}
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 181f08186d32..c2e65c646980 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -3531,7 +3531,7 @@ static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata;

static __init int setup_trace_event(char *str)
{
- strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
+ strscpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
ring_buffer_expanded = true;
disable_tracing_selftest("running event tracing");

diff --git a/kernel/trace/trace_events_inject.c b/kernel/trace/trace_events_inject.c
index d6b4935a78c0..abe805d471eb 100644
--- a/kernel/trace/trace_events_inject.c
+++ b/kernel/trace/trace_events_inject.c
@@ -217,7 +217,7 @@ static int parse_entry(char *str, struct trace_event_call *call, void **pentry)
char *addr = (char *)(unsigned long) val;

if (field->filter_type == FILTER_STATIC_STRING) {
- strlcpy(entry + field->offset, addr, field->size);
+ strscpy(entry + field->offset, addr, field->size);
} else if (field->filter_type == FILTER_DYN_STRING ||
field->filter_type == FILTER_RDYN_STRING) {
int str_len = strlen(addr) + 1;
@@ -232,7 +232,7 @@ static int parse_entry(char *str, struct trace_event_call *call, void **pentry)
}
entry = *pentry;

- strlcpy(entry + (entry_size - str_len), addr, str_len);
+ strscpy(entry + (entry_size - str_len), addr, str_len);
str_item = (u32 *)(entry + field->offset);
if (field->filter_type == FILTER_RDYN_STRING)
str_loc -= field->offset + field->size;
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 23f7f0ec4f4c..0f0262edb48a 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -29,7 +29,7 @@ static char kprobe_boot_events_buf[COMMAND_LINE_SIZE] __initdata;

static int __init set_kprobe_boot_events(char *str)
{
- strlcpy(kprobe_boot_events_buf, str, COMMAND_LINE_SIZE);
+ strscpy(kprobe_boot_events_buf, str, COMMAND_LINE_SIZE);
disable_tracing_selftest("running kprobe events");

return 1;
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 850a88abd33b..24da9a2ce070 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -245,7 +245,7 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
trace_probe_log_err(offset, GROUP_TOO_LONG);
return -EINVAL;
}
- strlcpy(buf, event, slash - event + 1);
+ strscpy(buf, event, slash - event + 1);
if (!is_good_name(buf)) {
trace_probe_log_err(offset, BAD_GROUP_NAME);
return -EINVAL;
--
2.35.1