New subject: [PATCH openEuler-1.0-LTS 2/2] config: Enable some configs for test

23 Nov 2021

From: Zhang Jian zhangjian210@huawei.com
ascend inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4JICC
CVE: NA
-------------------------------------------------
When we access the process's sp_group file and the precess is a kernel
process, it's task_struct->mm value will be 0, so we must check it, and
make sure the process is not a kernel process.
v1->v2: The path of a process as a kernel process is not often triggered,
so add a unlikely function to accelerate execytion.
Signed-off-by: Zhang Jian zhangjian210@huawei.com
Reviewed-by: Ding Tianhong dingtianhong@huawei.com
Reviewed-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Yang Yingliang yangyingliang@huawei.com
---
 mm/share_pool.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/share_pool.c b/mm/share_pool.c
index c6dcae92f67b5..2cc15f894cf84 100644
--- a/mm/share_pool.c
+++ b/mm/share_pool.c
@@ -3851,13 +3851,17 @@ int proc_sp_group_state(struct seq_file *m, struct pid_namespace *ns,
    		struct pid *pid, struct task_struct *task)
 {
    struct mm_struct *mm = task->mm;
-	struct sp_group_master *master = mm->sp_group_master;
+	struct sp_group_master *master;
    struct sp_proc_stat *proc_stat;
    struct spg_proc_stat *spg_proc_stat;
    int i;
    unsigned long anon, file, shmem, total_rss, prot;
    long sp_res, sp_res_nsize, non_sp_res, non_sp_shm;
+	if (unlikely(!mm))
+		return 0;
+
+	master = mm->sp_group_master;
    if (!master)
    	return 0;
-- 
2.25.1

    

[PATCH openEuler-1.0-LTS 1/2] share_pool: add mm address check when access the process's sp_group file