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Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 7ba8cd9845cb..5016bfb682b9 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -43,6 +43,7 @@
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/kdebug.h>
+#include <linux/memory.h>
#include <asm-generic/sections.h>
#include <asm/cacheflush.h>
@@ -699,9 +700,10 @@ int __kprobes register_kprobe(struct kprobe *p)
goto out;
}
+ mutex_lock(&text_mutex);
ret = arch_prepare_kprobe(p);
if (ret)
- goto out;
+ goto out_unlock_text;
INIT_HLIST_NODE(&p->hlist);
hlist_add_head_rcu(&p->hlist,
@@ -710,6 +712,8 @@ int __kprobes register_kprobe(struct kprobe *p)
if (kprobe_enabled)
arch_arm_kprobe(p);
+out_unlock_text:
+ mutex_unlock(&text_mutex);
out:
mutex_unlock(&kprobe_mutex);
@@ -746,8 +750,11 @@ valid_p:
* enabled and not gone - otherwise, the breakpoint would
* already have been removed. We save on flushing icache.
*/
- if (kprobe_enabled && !kprobe_gone(old_p))
+ if (kprobe_enabled && !kprobe_gone(old_p)) {
+ mutex_lock(&text_mutex);
arch_disarm_kprobe(p);
+ mutex_unlock(&text_mutex);
+ }
hlist_del_rcu(&old_p->hlist);
} else {
if (p->break_handler && !kprobe_gone(p))
@@ -912,10 +919,8 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p,
ri->rp = rp;
ri->task = current;
- if (rp->entry_handler && rp->entry_handler(ri, regs)) {
- spin_unlock_irqrestore(&rp->lock, flags);
+ if (rp->entry_handler && rp->entry_handler(ri, regs))
return 0;
- }
arch_prepare_kretprobe(ri, regs);
@@ -1280,12 +1285,14 @@ static void __kprobes enable_all_kprobes(void)
if (kprobe_enabled)
goto already_enabled;
+ mutex_lock(&text_mutex);
for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
head = &kprobe_table[i];
hlist_for_each_entry_rcu(p, node, head, hlist)
if (!kprobe_gone(p))
arch_arm_kprobe(p);
}
+ mutex_unlock(&text_mutex);
kprobe_enabled = true;
printk(KERN_INFO "Kprobes globally enabled\n");
@@ -1310,6 +1317,7 @@ static void __kprobes disable_all_kprobes(void)
kprobe_enabled = false;
printk(KERN_INFO "Kprobes globally disabled\n");
+ mutex_lock(&text_mutex);
for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
head = &kprobe_table[i];
hlist_for_each_entry_rcu(p, node, head, hlist) {
@@ -1318,6 +1326,7 @@ static void __kprobes disable_all_kprobes(void)
}
}
+ mutex_unlock(&text_mutex);
mutex_unlock(&kprobe_mutex);
/* Allow all currently running kprobes to complete */
synchronize_sched();