| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 14 Jun 2019 16:22:18 -0700
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>,
Eric Dumazet <edumazet@...gle.com>,
Willem de Bruijn <willemb@...gle.com>,
Feng Tang <feng.tang@...el.com>,
Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net 1/4] sysctl: define proc_do_static_key()
Convert proc_dointvec_minmax_bpf_stats() into a more generic
helper, since we are going to use jump labels more often.
Note that sysctl_bpf_stats_enabled is removed, since
it is no longer needed/used.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
include/linux/bpf.h | 1 -
include/linux/sysctl.h | 3 +++
kernel/bpf/core.c | 1 -
kernel/sysctl.c | 44 ++++++++++++++++++++++--------------------
4 files changed, 26 insertions(+), 23 deletions(-)
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 5df8e9e2a3933949af17dda1d77a4daccd5df611..b92ef9f73e42f1bcf0141aa21d0e9c17c5c7f05b 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -600,7 +600,6 @@ void bpf_map_area_free(void *base);
void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
extern int sysctl_unprivileged_bpf_disabled;
-extern int sysctl_bpf_stats_enabled;
int bpf_map_new_fd(struct bpf_map *map, int flags);
int bpf_prog_new_fd(struct bpf_prog *prog);
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index b769ecfcc3bd41aad6fd339ba824c6bb622ac24d..aadd310769d080f1d45db14b2a72fc8ad36f1196 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -63,6 +63,9 @@ extern int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int,
void __user *, size_t *, loff_t *);
extern int proc_do_large_bitmap(struct ctl_table *, int,
void __user *, size_t *, loff_t *);
+extern int proc_do_static_key(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos);
/*
* Register a set of sysctl names by calling register_sysctl_table
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 7c473f208a1058de97434a57a2d47e2360ae80a8..080e2bb644ccd761b3d54fbad9b58a881086231e 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -2097,7 +2097,6 @@ int __weak skb_copy_bits(const struct sk_buff *skb, int offset, void *to,
DEFINE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
EXPORT_SYMBOL(bpf_stats_enabled_key);
-int sysctl_bpf_stats_enabled __read_mostly;
/* All definitions of tracepoints related to BPF. */
#define CREATE_TRACE_POINTS
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 7d1008be6173313c807b2abb23f3171ef05cddc8..1beca96fb6252ddc4af07b6292f9dd95c4f53afd 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -230,11 +230,6 @@ static int proc_dostring_coredump(struct ctl_table *table, int write,
#endif
static int proc_dopipe_max_size(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos);
-#ifdef CONFIG_BPF_SYSCALL
-static int proc_dointvec_minmax_bpf_stats(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp,
- loff_t *ppos);
-#endif
#ifdef CONFIG_MAGIC_SYSRQ
/* Note: sysrq code uses its own private copy */
@@ -1253,12 +1248,10 @@ static struct ctl_table kern_table[] = {
},
{
.procname = "bpf_stats_enabled",
- .data = &sysctl_bpf_stats_enabled,
- .maxlen = sizeof(sysctl_bpf_stats_enabled),
+ .data = &bpf_stats_enabled_key.key,
+ .maxlen = sizeof(bpf_stats_enabled_key),
.mode = 0644,
- .proc_handler = proc_dointvec_minmax_bpf_stats,
- .extra1 = &zero,
- .extra2 = &one,
+ .proc_handler = proc_do_static_key,
},
#endif
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
@@ -3374,26 +3367,35 @@ int proc_do_large_bitmap(struct ctl_table *table, int write,
#endif /* CONFIG_PROC_SYSCTL */
-#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
-static int proc_dointvec_minmax_bpf_stats(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp,
- loff_t *ppos)
+#if defined(CONFIG_SYSCTL)
+int proc_do_static_key(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
{
- int ret, bpf_stats = *(int *)table->data;
- struct ctl_table tmp = *table;
+ struct static_key *key = (struct static_key *)table->data;
+ static DEFINE_MUTEX(static_key_mutex);
+ int val, ret;
+ struct ctl_table tmp = {
+ .data = &val,
+ .maxlen = sizeof(val),
+ .mode = table->mode,
+ .extra1 = &zero,
+ .extra2 = &one,
+ };
if (write && !capable(CAP_SYS_ADMIN))
return -EPERM;
- tmp.data = &bpf_stats;
+ mutex_lock(&static_key_mutex);
+ val = static_key_enabled(key);
ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
if (write && !ret) {
- *(int *)table->data = bpf_stats;
- if (bpf_stats)
- static_branch_enable(&bpf_stats_enabled_key);
+ if (val)
+ static_key_enable(key);
else
- static_branch_disable(&bpf_stats_enabled_key);
+ static_key_disable(key);
}
+ mutex_unlock(&static_key_mutex);
return ret;
}
#endif
--
2.22.0.410.gd8fdbe21b5-goog
Powered by blists - more mailing lists