From f72fc99d9032e74f066301b9e918fd86f0629ef6 Mon Sep 17 00:00:00 2001
From: ShirkNeko <109797057+ShirkNeko@users.noreply.github.com>
Date: Sat, 29 Mar 2025 18:40:35 +0800
Subject: [PATCH] Add files via upload

---
 backport.patch | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 backport.patch

diff --git a/backport.patch b/backport.patch
new file mode 100644
index 00000000..cb83e7d9
--- /dev/null
+++ b/backport.patch
@@ -0,0 +1,78 @@
+From 7e1e590523aa892fc225e740cdcba8ec4213f960 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?YC=E9=85=B1luyancib?= <luyancib@qq.com>
+Date: Thu, 27 Feb 2025 18:50:34 +0800
+Subject: [PATCH] Kernel:Add auto backport into the kernel source
+
+Copy from KSUN
+
+Co-Authored-By: Rifat Azad <33044977+rifsxd@users.noreply.github.com>
+---
+ kernel/Makefile | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 55 insertions(+)
+
+diff --git a/kernel/Makefile b/kernel/Makefile
+index 378f60e156af..72dd0333f92c 100644
+--- a/kernel/Makefile
++++ b/kernel/Makefile
+@@ -14,6 +14,61 @@ kernelsu-objs += selinux/rules.o
+ ccflags-y += -I$(srctree)/security/selinux -I$(srctree)/security/selinux/include
+ ccflags-y += -I$(objtree)/security/selinux -include $(srctree)/include/uapi/asm-generic/errno.h
+ 
++# Determine the appropriate atomic function and apply patch accordingly
++ifeq ($(shell grep -q "atomic_inc_not_zero" $(srctree)/kernel/cred.c; echo $$?),0)
++ATOMIC_INC_FUNC = atomic_inc_not_zero
++else ifeq ($(shell grep -q "atomic_long_inc_not_zero" $(srctree)/kernel/cred.c; echo $$?),0)
++ATOMIC_INC_FUNC = atomic_long_inc_not_zero
++else
++$(info --  Neither atomic_inc_not_zero nor atomic_long_inc_not_zero found in kernel/cred.c)
++endif
++
++# Inform which function is being patched
++$(info --  Using $(ATOMIC_INC_FUNC) in get_cred_rcu patch.)
++
++ifneq ($(shell grep -Eq "^static int can_umount" $(srctree)/fs/namespace.c; echo $$?),0)
++$(info -- Adding function 'static int can_umount(const struct path *path, int flags);' to $(srctree)/fs/namespace.c)
++CAN_UMOUNT = static int can_umount(const struct path *path, int flags)\n\
++{\n\t\
++        struct mount *mnt = real_mount(path->mnt);\n\t\
++        if (flags & ~(MNT_FORCE | MNT_DETACH | MNT_EXPIRE | UMOUNT_NOFOLLOW))\n\t\t\
++                return -EINVAL;\n\t\
++        if (!may_mount())\n\t\t\
++                return -EPERM;\n\t\
++        if (path->dentry != path->mnt->mnt_root)\n\t\t\
++                return -EINVAL;\n\t\
++        if (!check_mnt(mnt))\n\t\t\
++                return -EINVAL;\n\t\
++        if (mnt->mnt.mnt_flags & MNT_LOCKED)\n\t\t\
++                return -EINVAL;\n\t\
++        if (flags & MNT_FORCE && !capable(CAP_SYS_ADMIN))\n\t\t\
++                return -EPERM;\n\t\
++        return 0;\n\
++}\n
++$(shell sed -i '/^static bool is_mnt_ns_file/i $(CAN_UMOUNT)' $(srctree)/fs/namespace.c;)
++endif
++
++ifneq ($(shell grep -Eq "^int path_umount" $(srctree)/fs/namespace.c; echo $$?),0)
++$(info --  Adding function 'int path_umount(struct path *path, int flags);' to $(srctree)/fs/namespace.c)
++PATH_UMOUNT = int path_umount(struct path *path, int flags)\n\
++{\n\t\
++        struct mount *mnt = real_mount(path->mnt);\n\t\
++        int ret;\n\t\
++        ret = can_umount(path, flags);\n\t\
++        if (!ret)\n\t\t\
++                ret = do_umount(mnt, flags);\n\t\
++        dput(path->dentry);\n\t\
++        mntput_no_expire(mnt);\n\t\
++        return ret;\n\
++}\n
++$(shell sed -i '/^static bool is_mnt_ns_file/i $(PATH_UMOUNT)' $(srctree)/fs/namespace.c;)
++endif
++
++ifneq ($(shell grep -Eq "^int path_umount" $(srctree)/fs/internal.h; echo $$?),0)
++$(shell sed -i '/^extern void __init mnt_init/a int path_umount(struct path *path, int flags);' $(srctree)/fs/internal.h;)
++$(info --  Adding 'int path_umount(struct path *path, int flags);' to $(srctree)/fs/internal.h)
++endif
++
+ # Do checks before compile
+ ifneq ($(shell grep -q "int path_umount" $(srctree)/fs/namespace.c; echo $$?),0)
+ $(error -- Backporting path_umount is mandatory !! Read: https://kernelsu.org/guide/how-to-integrate-for-non-gki.html#how-to-backport-path-umount)