From: Ding Tianhong <dingtianhong@huawei.com> ascend inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4EUVI CVE: NA ------------------------------------------------- The fork() will create the new mm for new process, the mm should not take any information from the parent process, so need to clean it. The exit() will mmput the mm and free the memory, if the mm is alrready be used for sp_group, need to clean the group first. Signed-off-by: Tang Yizhou <tangyizhou@huawei.com> Signed-off-by: Li Ming <limingming.li@huawei.com> Signed-off-by: Zefan Li <lizefan@huawei.com> Signed-off-by: Zhou Guanghui <zhouguanghui1@huawei.com> Signed-off-by: Ding Tianhong <dingtianhong@huawei.com> Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Reviewed-by: Weilong Chen <chenweilong@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- kernel/fork.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/kernel/fork.c b/kernel/fork.c index be67a4aa10631..c410887b502b2 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -91,6 +91,7 @@ #include <linux/kcov.h> #include <linux/livepatch.h> #include <linux/thread_info.h> +#include <linux/share_pool.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> @@ -1027,6 +1028,9 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, goto fail_nocontext; mm->user_ns = get_user_ns(user_ns); + + sp_init_mm(mm); + return mm; fail_nocontext: @@ -1055,11 +1059,16 @@ static inline void __mmput(struct mm_struct *mm) { VM_BUG_ON(atomic_read(&mm->mm_users)); + sp_group_exit(mm); + uprobe_clear_state(mm); exit_aio(mm); ksm_exit(mm); khugepaged_exit(mm); /* must run before exit_mmap */ exit_mmap(mm); + + sp_group_post_exit(mm); + mm_put_huge_zero_page(mm); set_mm_exe_file(mm, NULL); if (!list_empty(&mm->mmlist)) { -- 2.25.1