etmem/0079-etmem-fix-problem-of-abnormal-task-value.patch

From d51198f972f18ef99e887294c8c1de521ca66cf1 Mon Sep 17 00:00:00 2001
From: liubo <liubo254@huawei.com>
Date: Thu, 26 May 2022 15:26:30 +0800
Subject: [PATCH 29/33] etmem: fix problem of abnormal task value

1. When adding a task, if the task value contains
   abnormal characters or the name is too long,
   an error should be returned.
2. remove useless function.

Signed-off-by: liubo <liubo254@huawei.com>
---
 etmem/inc/etmemd_inc/etmemd_common.h |  4 ++--
 etmem/src/etmemd_src/etmemd_common.c | 39 ++++++++----------------------------
 etmem/src/etmemd_src/etmemd_task.c   |  7 +++++++
 3 files changed, 17 insertions(+), 33 deletions(-)

diff --git a/etmem/inc/etmemd_inc/etmemd_common.h b/etmem/inc/etmemd_inc/etmemd_common.h
index f3808b3..795e600 100644
--- a/etmem/inc/etmemd_inc/etmemd_common.h
+++ b/etmem/inc/etmemd_inc/etmemd_common.h
@@ -45,6 +45,7 @@
 
 /* in some system the max length of pid may be larger than 5, so we use 10 herr */
 #define PID_STR_MAX_LEN                 10
+#define NAME_STR_MAX_LEN                15
 #define SWAP_THRESHOLD_MAX_LEN          10
 
 #define PIPE_FD_LEN                     2
@@ -76,7 +77,6 @@ void etmemd_safe_free(void **ptr);
 FILE *etmemd_get_proc_file(const char *pid, const char *file, const char *mode);
 int etmemd_send_ioctl_cmd(FILE *fp, struct ioctl_para *request);
 
-int get_keyword_and_value(const char *str, char *key, char *val);
 unsigned long get_pagesize(void);
 int get_mem_from_proc_file(const char *pid, const char *file_name, unsigned long *data, const char *cmpstr);
 
@@ -85,5 +85,5 @@ int dprintf_all(int fd, const char *format, ...);
 int get_swap_threshold_inKB(const char *string, unsigned long *value);
 int file_permission_check(const char *file_path, mode_t mode);
 int file_size_check(const char *file_path, off_t size);
-
+int check_str_valid(const char *str);
 #endif
diff --git a/etmem/src/etmemd_src/etmemd_common.c b/etmem/src/etmemd_src/etmemd_common.c
index a12a43f..649f472 100644
--- a/etmem/src/etmemd_src/etmemd_common.c
+++ b/etmem/src/etmemd_src/etmemd_common.c
@@ -357,54 +357,31 @@ static bool check_result_str_valid(const char *result)
     return true;
 }
 
-static unsigned long skip_colon_to_parse(const char *str, unsigned long idx)
-{
-    size_t str_len = strlen(str);
-
-    while (idx < str_len) {
-        if (!is_valid_char_for_value(" :\t", str[idx])) {
-            break;
-        }
-        idx += 1;
-    }
-
-    return idx;
-}
-
-/*
- * the caller should make sure that str is not NULL, and the content
- * of str must not contain ' ' or '\t' at the beginning and the end
- * */
-int get_keyword_and_value(const char *str, char *key, char *val)
+int check_str_valid(const char *str)
 {
     unsigned long idx = 0;
     unsigned long end_idx;
     size_t val_len;
+    char val[KEY_VALUE_MAX_LEN] = {0};
 
-    get_valid_conf_str(str, idx, key, "%_", &end_idx);
-    if (!check_result_str_valid(key)) {
-        etmemd_log(ETMEMD_LOG_ERR, "get keyword of %s fail\n", str);
-        return -1;
-    }
-    if (!is_valid_char_for_value(" :\t", str[end_idx])) {
-        etmemd_log(ETMEMD_LOG_ERR, "%s contains invalid symbol in keyword\n", str);
+    if (str == NULL || strlen(str) == 0 || strlen(str) > NAME_STR_MAX_LEN) {
+        etmemd_log(ETMEMD_LOG_ERR, "input str: %s is invalid.\n", str);
         return -1;
     }
-    etmemd_log(ETMEMD_LOG_DEBUG, "parse config get key: %s\n", key);
 
-    /* skip the string contains ' ', '\t' and ':' between key and value */
-    idx = skip_colon_to_parse(str, end_idx);
-    val_len = strlen(str) - idx;
+    val_len = strlen(str);
 
     get_valid_conf_str(str, idx, val, ".%/_-", &end_idx);
     if (!check_result_str_valid(val)) {
-        etmemd_log(ETMEMD_LOG_ERR, "get value of %s fail\n", str);
+        etmemd_log(ETMEMD_LOG_ERR, "get value of %s fail, contain invalid symbol\n", str);
         return -1;
     }
+
     if (strlen(val) != val_len) {
         etmemd_log(ETMEMD_LOG_ERR, "%s contains invalid symbol in value\n", str);
         return -1;
     }
+
     etmemd_log(ETMEMD_LOG_DEBUG, "parse config get value: %s\n", val);
 
     return 0;
diff --git a/etmem/src/etmemd_src/etmemd_task.c b/etmem/src/etmemd_src/etmemd_task.c
index 649d48e..dfe911f 100644
--- a/etmem/src/etmemd_src/etmemd_task.c
+++ b/etmem/src/etmemd_src/etmemd_task.c
@@ -440,6 +440,13 @@ static int fill_task_value(void *obj, void *val)
 {
     struct task *tk = (struct task *)obj;
     char *value = (char *)val;
+
+    if (check_str_valid(value) != 0) {
+        etmemd_log(ETMEMD_LOG_ERR, "invalid task value, please check.\n");
+        free(val);
+        return -1;
+    }
+
     tk->value = value;
     return 0;
 }
-- 
1.8.3.1