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kernel: auto backport path_umount to fs/namespace.c at build time

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Rifat Azad
2024-12-18 21:34:04 +06:00
parent 67a8381767
commit c25cb9aa4b
1 changed files with 42 additions and 1 deletions
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43
kernel/Makefile
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@@ -71,8 +71,49 @@ ccflags-y += -DEXPECTED_HASH=\"$(KSU_EXPECTED_HASH)\"
ccflags-y += -DEXPECTED_NEXT_SIZE=$(KSU_NEXT_EXPECTED_SIZE) ccflags-y += -DEXPECTED_NEXT_SIZE=$(KSU_NEXT_EXPECTED_SIZE)
ccflags-y += -DEXPECTED_NEXT_HASH=\"$(KSU_NEXT_EXPECTED_HASH)\" ccflags-y += -DEXPECTED_NEXT_HASH=\"$(KSU_NEXT_EXPECTED_HASH)\"
ifeq ($(shell grep -q "int path_umount" $(srctree)/fs/namespace.c; echo $$?),0)
ccflags-y += -DKSU_UMOUNT ccflags-y += -DKSU_UMOUNT
ifneq ($(shell grep -Eq "^static int can_umount" $(srctree)/fs/namespace.c; echo $$?),0)
$(info -- KSU_NEXT: 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 $$?),0)
$(info -- KSU_NEXT: adding function 'int path_umount(struct path *path, int flags);' to $(srctree)/fs/namespace.c)
PATH_UMOUNT = int path_umount(struct path *path, int flags)\n\
{\n\t\
struct mount *mnt = real_mount(path->mnt);\n\t\
int ret;\n\t\
ret = can_umount(path, flags);\n\t\
if (!ret)\n\t\t\
ret = do_umount(mnt, flags);\n\t\
dput(path->dentry);\n\t\
mntput_no_expire(mnt);\n\t\
return ret;\n\
}\n
$(shell sed -i '/^static bool is_mnt_ns_file/i $(PATH_UMOUNT)' $(srctree)/fs/namespace.c;)
endif
ifneq ($(shell grep -Eq "^int path_umount" $(srctree)/fs/internal.h; echo $$?),0)
$(shell sed -i '/^extern void __init mnt_init/a int path_umount(struct path *path, int flags);' $(srctree)/fs/internal.h;)
$(info -- KSU_NEXT: adding 'int path_umount(struct path *path, int flags);' to $(srctree)/fs/internal.h)
endif endif
ccflags-y += -Wno-implicit-function-declaration -Wno-strict-prototypes -Wno-int-conversion -Wno-gcc-compat ccflags-y += -Wno-implicit-function-declaration -Wno-strict-prototypes -Wno-int-conversion -Wno-gcc-compat