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From d08bab23c4b4a49a7e81528c142ec515b48b396a Mon Sep 17 00:00:00 2001
From: guo-zhicheng666 <1678717630@qq.com>
Date: Wed, 18 Sep 2024 20:43:24 +0800
Subject: [PATCH] support monitor process function by kprobe
Signed-off-by: guo-zhicheng666 <1678717630@qq.com>
---
module/fdstat.c | 123 ++++++++++++++++++++++++++++++++++++++++--------
module/fdstat.h | 2 -
2 files changed, 104 insertions(+), 21 deletions(-)
diff --git a/module/fdstat.c b/module/fdstat.c
index 5b1aa9a..c2f7d1d 100644
--- a/module/fdstat.c
+++ b/module/fdstat.c
@@ -11,40 +11,125 @@
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
+#include <linux/fdtable.h>
+#include <linux/atomic.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/resource.h>
+
+#include <asm/ptrace.h>
+#include <asm/current.h>
+#include <linux/kprobes.h>
#include "sysmonitor_main.h"
-#ifdef CONFIG_EULEROS_SYSMONITOR_FD
-static int do_fdstat(struct notifier_block *self, unsigned long val, void *data)
+static unsigned int fdthreshold = 80;
+struct proc_dir_entry *fdthreshold_entry = NULL;
+
+static unsigned int count_fd_num(struct fdtable *fdt)
+{
+ unsigned int size = fdt->max_fds;
+ unsigned int fd;
+ unsigned int handle_count = 0;
+
+ /* Find the last open fd */
+ for (fd = 0; fd < size; fd++) {
+ if (fdt->fd[fd])
+ handle_count++;
+ }
+ return handle_count;
+}
+
+static int handler_pre(struct kprobe *p, struct pt_regs *regs)
{
- struct fdstat *notifier_call_data = (struct fdstat *)data;
struct fdstat msg;
+ unsigned int total_fd_num = 0;
+ struct files_struct *files = current->files;
+ struct fdtable *fdt = files_fdtable(files);
+
+ if (fdt) {
+ total_fd_num = count_fd_num(fdt);
+ }
+
+ if (total_fd_num == (unsigned int)rlimit(RLIMIT_NOFILE) * fdthreshold / 100) {
+ pr_err("total_fd_num : %u\n", total_fd_num);
+ (void)memset(&msg, 0, sizeof(struct fdstat));
+ msg.pid = current->pid;
+ msg.total_fd_num = total_fd_num;
+ (void)memcpy(msg.comm, current->comm, TASK_COMM_LEN);
+ (void)save_msg(FDSTAT, &msg, sizeof(struct fdstat));
+ }
+
+ return 0;
+}
+
+static int fdthreshold_show(struct seq_file *userfile, void *v)
+{
+ seq_printf(userfile, "%u\n", fdthreshold);
+ return 0;
+}
+
+static int fdthreshold_open(struct inode *inode, struct file *file)
+{
+ single_open(file, fdthreshold_show, NULL);
+
+ return 0;
+}
+
+static ssize_t fdthreshold_write(struct file *file, const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
int ret;
+ unsigned int val;
+
+ ret = kstrtouint_from_user(ubuf, cnt, 10, &val);
+ if (ret) {
+ pr_err("[fdstat] parse fdthreshold failed\n");
+ return ret;
+ }
- (void)memset(&msg, 0, sizeof(struct fdstat));
- msg.pid = notifier_call_data->pid;
- msg.total_fd_num = notifier_call_data->total_fd_num + 1;
- (void)memcpy(msg.comm, notifier_call_data->comm, TASK_COMM_LEN);
- (void)save_msg(FDSTAT, &msg, sizeof(struct fdstat));
- return NOTIFY_DONE;
+ if (val < 1 || val > 99) {
+ pr_err("[fdstat] fdthreshold is invalid\n");
+ return -EINVAL;
+ }
+
+ fdthreshold = val;
+
+ return cnt;
}
-static struct notifier_block g_fdstat_nb = {
- .notifier_call = do_fdstat,
- .priority = NOTIFY_CALL_PRIORITY,
+static const struct proc_ops fdthreshold_operations = {
+ .proc_open = fdthreshold_open,
+ .proc_read = seq_read,
+ .proc_lseek = seq_lseek,
+ .proc_release = single_release,
+ .proc_write = fdthreshold_write,
+};
+
+static struct kprobe kp = {
+ .symbol_name = "do_sys_openat2",
+ .pre_handler = handler_pre,
};
-#endif
void fdstat_init(void)
{
-#ifdef CONFIG_EULEROS_SYSMONITOR_FD
- (void)register_fdstat_notifier(&g_fdstat_nb);
-#endif
+ if (register_kprobe(&kp) < 0)
+ pr_err("Failed to register handler for %s\n", kp.symbol_name);
+
+ fdthreshold_entry = proc_create("fdthreshold", 0600, NULL, &fdthreshold_operations);
+ if (!fdthreshold_entry) {
+ pr_err("[fdstat]: create /proc/fdthreshold failed\n");
+ }
}
void fdstat_exit(void)
{
-#ifdef CONFIG_EULEROS_SYSMONITOR_FD
- (void)unregister_fdstat_notifier(&g_fdstat_nb);
-#endif
+ unregister_kprobe(&kp);
+
+ if (fdthreshold_entry != NULL) {
+ proc_remove(fdthreshold_entry);
+ }
}
diff --git a/module/fdstat.h b/module/fdstat.h
index ae9ccc3..1a389ca 100644
--- a/module/fdstat.h
+++ b/module/fdstat.h
@@ -10,13 +10,11 @@
#include <linux/types.h>
#include <linux/sched.h>
-#ifndef CONFIG_EULEROS_SYSMONITOR_FD
struct fdstat {
pid_t pid;
unsigned int total_fd_num;
char comm[TASK_COMM_LEN];
};
-#endif
void fdstat_init(void);
void fdstat_exit(void);
--
2.33.0
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