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Date: Thu, 24 Feb 2022 18:52:34 +0800
From: Meng Tang <tangmeng@...ontech.com>
To: mcgrof@...nel.org, keescook@...omium.org, yzaikin@...gle.com
Cc: guoren@...nel.org, nickhu@...estech.com, green.hu@...il.com,
deanbo422@...il.com, ebiggers@...nel.org, tytso@....edu,
wad@...omium.org, john.johansen@...onical.com, jmorris@...ei.org,
serge@...lyn.com, linux-csky@...r.kernel.org,
linux-fscrypt@...r.kernel.org,
linux-security-module@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
Meng Tang <tangmeng@...ontech.com>
Subject: [PATCH v2] fs/proc: Optimize arrays defined by struct ctl_path
Previously, arrays defined by struct ctl_path is terminated
with an empty one. For example, when we actually only register
one ctl_path, we've gone from 8 bytes to 16 bytes.
So, I use ARRAY_SIZE() as a boundary condition to optimize it.
Signed-off-by: Meng Tang <tangmeng@...ontech.com>
---
arch/csky/abiv1/alignment.c | 8 ++++----
arch/nds32/mm/alignment.c | 8 ++++----
fs/proc/proc_sysctl.c | 10 ++++++----
fs/verity/signature.c | 5 +++--
include/linux/sysctl.h | 6 +++---
kernel/pid_namespace.c | 5 +++--
kernel/seccomp.c | 7 ++++---
security/apparmor/lsm.c | 5 +++--
security/loadpin/loadpin.c | 5 +++--
security/yama/yama_lsm.c | 7 ++++---
10 files changed, 37 insertions(+), 29 deletions(-)
diff --git a/arch/csky/abiv1/alignment.c b/arch/csky/abiv1/alignment.c
index 2df115d0e210..b9290a252d84 100644
--- a/arch/csky/abiv1/alignment.c
+++ b/arch/csky/abiv1/alignment.c
@@ -340,14 +340,14 @@ static struct ctl_table sysctl_table[2] = {
{}
};
-static struct ctl_path sysctl_path[2] = {
- {.procname = "csky"},
- {}
+static struct ctl_path sysctl_path[1] = {
+ {.procname = "csky"}
};
+#define SYSCTL_PATH_NUM ARRAY_SIZE(sysctl_path)
static int __init csky_alignment_init(void)
{
- register_sysctl_paths(sysctl_path, sysctl_table);
+ register_sysctl_paths(sysctl_path, SYSCTL_PATH_NUM, sysctl_table);
return 0;
}
diff --git a/arch/nds32/mm/alignment.c b/arch/nds32/mm/alignment.c
index 1eb7ded6992b..7145a006fc92 100644
--- a/arch/nds32/mm/alignment.c
+++ b/arch/nds32/mm/alignment.c
@@ -560,17 +560,17 @@ static struct ctl_table nds32_sysctl_table[2] = {
{}
};
-static struct ctl_path nds32_path[2] = {
- {.procname = "nds32"},
- {}
+static struct ctl_path nds32_path[1] = {
+ {.procname = "nds32"}
};
+#define NDS32_PATH_NUM ARRAY_SIZE(nds32_path)
/*
* Initialize nds32 alignment-correction interface
*/
static int __init nds32_sysctl_init(void)
{
- register_sysctl_paths(nds32_path, nds32_sysctl_table);
+ register_sysctl_paths(nds32_path, NDS32_PATH_NUM, nds32_sysctl_table);
return 0;
}
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 9ecd5c87e8dd..7774dc159e60 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -1601,20 +1601,21 @@ static int register_leaf_sysctl_tables(const char *path, char *pos,
*/
struct ctl_table_header *__register_sysctl_paths(
struct ctl_table_set *set,
- const struct ctl_path *path, struct ctl_table *table)
+ const struct ctl_path *path, int ctl_path_num, struct ctl_table *table)
{
struct ctl_table *ctl_table_arg = table;
int nr_subheaders = count_subheaders(table);
struct ctl_table_header *header = NULL, **subheaders, **subheader;
const struct ctl_path *component;
char *new_path, *pos;
+ int i;
pos = new_path = kmalloc(PATH_MAX, GFP_KERNEL);
if (!new_path)
return NULL;
pos[0] = '\0';
- for (component = path; component->procname; component++) {
+ for (component = path, i = 0; component->procname && i < ctl_path_num; component++, i++) {
pos = append_path(new_path, pos, component->procname);
if (!pos)
goto out;
@@ -1671,10 +1672,11 @@ struct ctl_table_header *__register_sysctl_paths(
* See __register_sysctl_paths for more details.
*/
struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
+ int ctl_path_num,
struct ctl_table *table)
{
return __register_sysctl_paths(&sysctl_table_root.default_set,
- path, table);
+ path, ctl_path_num, table);
}
EXPORT_SYMBOL(register_sysctl_paths);
@@ -1691,7 +1693,7 @@ struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
{
static const struct ctl_path null_path[] = { {} };
- return register_sysctl_paths(null_path, table);
+ return register_sysctl_paths(null_path, ARRAY_SIZE(null_path), table);
}
EXPORT_SYMBOL(register_sysctl_table);
diff --git a/fs/verity/signature.c b/fs/verity/signature.c
index 143a530a8008..e243e8c1cc38 100644
--- a/fs/verity/signature.c
+++ b/fs/verity/signature.c
@@ -92,9 +92,9 @@ static struct ctl_table_header *fsverity_sysctl_header;
static const struct ctl_path fsverity_sysctl_path[] = {
{ .procname = "fs", },
- { .procname = "verity", },
- { }
+ { .procname = "verity", }
};
+#define FSVERITY_SYSCTL_PATH_NUM ARRAY_SIZE(fsverity_sysctl_path)
static struct ctl_table fsverity_sysctl_table[] = {
{
@@ -112,6 +112,7 @@ static struct ctl_table fsverity_sysctl_table[] = {
static int __init fsverity_sysctl_init(void)
{
fsverity_sysctl_header = register_sysctl_paths(fsverity_sysctl_path,
+ FSVERITY_SYSCTL_PATH_NUM,
fsverity_sysctl_table);
if (!fsverity_sysctl_header) {
pr_err("sysctl registration failed!\n");
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 889c995d8a08..f4e3ccf2dbd3 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -221,11 +221,11 @@ struct ctl_table_header *__register_sysctl_table(
const char *path, struct ctl_table *table);
struct ctl_table_header *__register_sysctl_paths(
struct ctl_table_set *set,
- const struct ctl_path *path, struct ctl_table *table);
+ const struct ctl_path *path, int ctl_path_num, struct ctl_table *table);
struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table);
struct ctl_table_header *register_sysctl_table(struct ctl_table * table);
struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
- struct ctl_table *table);
+ int ctl_path_num, struct ctl_table *table);
void unregister_sysctl_table(struct ctl_table_header * table);
@@ -272,7 +272,7 @@ static inline struct ctl_table_header *register_sysctl_mount_point(const char *p
}
static inline struct ctl_table_header *register_sysctl_paths(
- const struct ctl_path *path, struct ctl_table *table)
+ const struct ctl_path *path, int ctl_path_num, struct ctl_table *table)
{
return NULL;
}
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index a46a3723bc66..ad9be671333b 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -294,7 +294,8 @@ static struct ctl_table pid_ns_ctl_table[] = {
},
{ }
};
-static struct ctl_path kern_path[] = { { .procname = "kernel", }, { } };
+static struct ctl_path kern_path[] = { { .procname = "kernel", } };
+#define KERN_PATH_NUM ARRAY_SIZE(kern_path)
#endif /* CONFIG_CHECKPOINT_RESTORE */
int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
@@ -453,7 +454,7 @@ static __init int pid_namespaces_init(void)
pid_ns_cachep = KMEM_CACHE(pid_namespace, SLAB_PANIC | SLAB_ACCOUNT);
#ifdef CONFIG_CHECKPOINT_RESTORE
- register_sysctl_paths(kern_path, pid_ns_ctl_table);
+ register_sysctl_paths(kern_path, KERN_PATH_NUM, pid_ns_ctl_table);
#endif
return 0;
}
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index db10e73d06e0..9488d6831cf5 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -2333,9 +2333,9 @@ static int seccomp_actions_logged_handler(struct ctl_table *ro_table, int write,
static struct ctl_path seccomp_sysctl_path[] = {
{ .procname = "kernel", },
- { .procname = "seccomp", },
- { }
+ { .procname = "seccomp", }
};
+#define SECCOMP_SYSCTL_PATH_NUM ARRAY_SIZE(seccomp_sysctl_path)
static struct ctl_table seccomp_sysctl_table[] = {
{
@@ -2357,7 +2357,8 @@ static int __init seccomp_sysctl_init(void)
{
struct ctl_table_header *hdr;
- hdr = register_sysctl_paths(seccomp_sysctl_path, seccomp_sysctl_table);
+ hdr = register_sysctl_paths(seccomp_sysctl_path, SECCOMP_SYSCTL_PATH_NUM,
+ seccomp_sysctl_table);
if (!hdr)
pr_warn("sysctl registration failed\n");
else
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 4f0eecb67dde..b8cfe202db65 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1729,9 +1729,9 @@ static int apparmor_dointvec(struct ctl_table *table, int write,
}
static struct ctl_path apparmor_sysctl_path[] = {
- { .procname = "kernel", },
- { }
+ { .procname = "kernel", }
};
+#define APPARMOR_SYSCTL_PATH_NUM ARRAY_SIZE(apparmor_sysctl_path)
static struct ctl_table apparmor_sysctl_table[] = {
{
@@ -1747,6 +1747,7 @@ static struct ctl_table apparmor_sysctl_table[] = {
static int __init apparmor_init_sysctl(void)
{
return register_sysctl_paths(apparmor_sysctl_path,
+ APPARMOR_SYSCTL_PATH_NUM,
apparmor_sysctl_table) ? 0 : -ENOMEM;
}
#else
diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c
index b12f7d986b1e..7728f061f8c0 100644
--- a/security/loadpin/loadpin.c
+++ b/security/loadpin/loadpin.c
@@ -48,9 +48,9 @@ static DEFINE_SPINLOCK(pinned_root_spinlock);
static struct ctl_path loadpin_sysctl_path[] = {
{ .procname = "kernel", },
- { .procname = "loadpin", },
- { }
+ { .procname = "loadpin", }
};
+#define LOADPIN_SYSCTL_PATH_NUM ARRAY_SIZE(loadpin_sysctl_path)
static struct ctl_table loadpin_sysctl_table[] = {
{
@@ -91,6 +91,7 @@ static void check_pinning_enforcement(struct super_block *mnt_sb)
if (!ro) {
if (!register_sysctl_paths(loadpin_sysctl_path,
+ LOADPIN_SYSCTL_PATH_NUM,
loadpin_sysctl_table))
pr_notice("sysctl registration failed!\n");
else
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index 06e226166aab..d2460b963fd9 100644
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -449,9 +449,9 @@ static int max_scope = YAMA_SCOPE_NO_ATTACH;
static struct ctl_path yama_sysctl_path[] = {
{ .procname = "kernel", },
- { .procname = "yama", },
- { }
+ { .procname = "yama", }
};
+#define YAMA_SYSCTL_PATH_NUM ARRAY_SIZE(yama_sysctl_path)
static struct ctl_table yama_sysctl_table[] = {
{
@@ -467,7 +467,8 @@ static struct ctl_table yama_sysctl_table[] = {
};
static void __init yama_init_sysctl(void)
{
- if (!register_sysctl_paths(yama_sysctl_path, yama_sysctl_table))
+ if (!register_sysctl_paths(yama_sysctl_path, YAMA_SYSCTL_PATH_NUM,
+ yama_sysctl_table))
panic("Yama: sysctl registration failed.\n");
}
#else
--
2.20.1
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