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-rw-r--r--kernel/kprobes.c113
1 files changed, 111 insertions, 2 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 6fcf8dd148d0..d25a9ada3f8e 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -39,6 +39,8 @@
39#include <linux/moduleloader.h> 39#include <linux/moduleloader.h>
40#include <linux/kallsyms.h> 40#include <linux/kallsyms.h>
41#include <linux/freezer.h> 41#include <linux/freezer.h>
42#include <linux/seq_file.h>
43#include <linux/debugfs.h>
42#include <asm-generic/sections.h> 44#include <asm-generic/sections.h>
43#include <asm/cacheflush.h> 45#include <asm/cacheflush.h>
44#include <asm/errno.h> 46#include <asm/errno.h>
@@ -778,6 +780,12 @@ int __kprobes register_kretprobe(struct kretprobe *rp)
778 return -ENOSYS; 780 return -ENOSYS;
779} 781}
780 782
783static int __kprobes pre_handler_kretprobe(struct kprobe *p,
784 struct pt_regs *regs)
785{
786 return 0;
787}
788
781#endif /* ARCH_SUPPORTS_KRETPROBES */ 789#endif /* ARCH_SUPPORTS_KRETPROBES */
782 790
783void __kprobes unregister_kretprobe(struct kretprobe *rp) 791void __kprobes unregister_kretprobe(struct kretprobe *rp)
@@ -815,7 +823,109 @@ static int __init init_kprobes(void)
815 return err; 823 return err;
816} 824}
817 825
818__initcall(init_kprobes); 826#ifdef CONFIG_DEBUG_FS
827static void __kprobes report_probe(struct seq_file *pi, struct kprobe *p,
828 const char *sym, int offset,char *modname)
829{
830 char *kprobe_type;
831
832 if (p->pre_handler == pre_handler_kretprobe)
833 kprobe_type = "r";
834 else if (p->pre_handler == setjmp_pre_handler)
835 kprobe_type = "j";
836 else
837 kprobe_type = "k";
838 if (sym)
839 seq_printf(pi, "%p %s %s+0x%x %s\n", p->addr, kprobe_type,
840 sym, offset, (modname ? modname : " "));
841 else
842 seq_printf(pi, "%p %s %p\n", p->addr, kprobe_type, p->addr);
843}
844
845static void __kprobes *kprobe_seq_start(struct seq_file *f, loff_t *pos)
846{
847 return (*pos < KPROBE_TABLE_SIZE) ? pos : NULL;
848}
849
850static void __kprobes *kprobe_seq_next(struct seq_file *f, void *v, loff_t *pos)
851{
852 (*pos)++;
853 if (*pos >= KPROBE_TABLE_SIZE)
854 return NULL;
855 return pos;
856}
857
858static void __kprobes kprobe_seq_stop(struct seq_file *f, void *v)
859{
860 /* Nothing to do */
861}
862
863static int __kprobes show_kprobe_addr(struct seq_file *pi, void *v)
864{
865 struct hlist_head *head;
866 struct hlist_node *node;
867 struct kprobe *p, *kp;
868 const char *sym = NULL;
869 unsigned int i = *(loff_t *) v;
870 unsigned long size, offset = 0;
871 char *modname, namebuf[128];
872
873 head = &kprobe_table[i];
874 preempt_disable();
875 hlist_for_each_entry_rcu(p, node, head, hlist) {
876 sym = kallsyms_lookup((unsigned long)p->addr, &size,
877 &offset, &modname, namebuf);
878 if (p->pre_handler == aggr_pre_handler) {
879 list_for_each_entry_rcu(kp, &p->list, list)
880 report_probe(pi, kp, sym, offset, modname);
881 } else
882 report_probe(pi, p, sym, offset, modname);
883 }
884 preempt_enable();
885 return 0;
886}
887
888static struct seq_operations kprobes_seq_ops = {
889 .start = kprobe_seq_start,
890 .next = kprobe_seq_next,
891 .stop = kprobe_seq_stop,
892 .show = show_kprobe_addr
893};
894
895static int __kprobes kprobes_open(struct inode *inode, struct file *filp)
896{
897 return seq_open(filp, &kprobes_seq_ops);
898}
899
900static struct file_operations debugfs_kprobes_operations = {
901 .open = kprobes_open,
902 .read = seq_read,
903 .llseek = seq_lseek,
904 .release = seq_release,
905};
906
907static int __kprobes debugfs_kprobe_init(void)
908{
909 struct dentry *dir, *file;
910
911 dir = debugfs_create_dir("kprobes", NULL);
912 if (!dir)
913 return -ENOMEM;
914
915 file = debugfs_create_file("list", 0444, dir , 0 ,
916 &debugfs_kprobes_operations);
917 if (!file) {
918 debugfs_remove(dir);
919 return -ENOMEM;
920 }
921
922 return 0;
923}
924
925late_initcall(debugfs_kprobe_init);
926#endif /* CONFIG_DEBUG_FS */
927
928module_init(init_kprobes);
819 929
820EXPORT_SYMBOL_GPL(register_kprobe); 930EXPORT_SYMBOL_GPL(register_kprobe);
821EXPORT_SYMBOL_GPL(unregister_kprobe); 931EXPORT_SYMBOL_GPL(unregister_kprobe);
@@ -824,4 +934,3 @@ EXPORT_SYMBOL_GPL(unregister_jprobe);
824EXPORT_SYMBOL_GPL(jprobe_return); 934EXPORT_SYMBOL_GPL(jprobe_return);
825EXPORT_SYMBOL_GPL(register_kretprobe); 935EXPORT_SYMBOL_GPL(register_kretprobe);
826EXPORT_SYMBOL_GPL(unregister_kretprobe); 936EXPORT_SYMBOL_GPL(unregister_kretprobe);
827