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Subject[PATCH 14/23] init: add an init_chown helper
Date
Add a simple helper to chown with a kernel space file name and switch
the early init code over to it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/init.c | 18 ++++++++++++++++++
fs/internal.h | 2 +-
fs/open.c | 2 +-
include/linux/init_syscalls.h | 1 +
init/initramfs.c | 6 +++---
5 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/fs/init.c b/fs/init.c
index 2c78f24814dde4..edd0244655956e 100644
--- a/fs/init.c
+++ b/fs/init.c
@@ -78,6 +78,24 @@ int __init init_chroot(const char *filename)
return error;
}

+int __init init_chown(const char *filename, uid_t user, gid_t group, int flags)
+{
+ int lookup_flags = (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
+ struct path path;
+ int error;
+
+ error = kern_path(filename, lookup_flags, &path);
+ if (error)
+ return error;
+ error = mnt_want_write(path.mnt);
+ if (!error) {
+ error = chown_common(&path, user, group);
+ mnt_drop_write(path.mnt);
+ }
+ path_put(&path);
+ return error;
+}
+
int __init init_unlink(const char *pathname)
{
return do_unlinkat(AT_FDCWD, getname_kernel(pathname));
diff --git a/fs/internal.h b/fs/internal.h
index 491d1e63809b37..e81b9e23c3ea3f 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -134,7 +134,7 @@ long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
int do_fchmodat(int dfd, const char __user *filename, umode_t mode);
int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
int flag);
-
+int chown_common(const struct path *path, uid_t user, gid_t group);
extern int vfs_open(const struct path *, struct file *);

/*
diff --git a/fs/open.c b/fs/open.c
index f62f4752bb436d..49960a1248f14b 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -639,7 +639,7 @@ SYSCALL_DEFINE2(chmod, const char __user *, filename, umode_t, mode)
return do_fchmodat(AT_FDCWD, filename, mode);
}

-static int chown_common(const struct path *path, uid_t user, gid_t group)
+int chown_common(const struct path *path, uid_t user, gid_t group)
{
struct inode *inode = path->dentry->d_inode;
struct inode *delegated_inode = NULL;
diff --git a/include/linux/init_syscalls.h b/include/linux/init_syscalls.h
index e07099a14b91db..0da59d76133e17 100644
--- a/include/linux/init_syscalls.h
+++ b/include/linux/init_syscalls.h
@@ -5,5 +5,6 @@ int __init init_mount(const char *dev_name, const char *dir_name,
int __init init_umount(const char *name, int flags);
int __init init_chdir(const char *filename);
int __init init_chroot(const char *filename);
+int __init init_chown(const char *filename, uid_t user, gid_t group, int flags);
int __init init_unlink(const char *pathname);
int __init init_rmdir(const char *pathname);
diff --git a/init/initramfs.c b/init/initramfs.c
index fb7210731d9e5d..24a8dcc6734064 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -349,14 +349,14 @@ static int __init do_name(void)
}
} else if (S_ISDIR(mode)) {
ksys_mkdir(collected, mode);
- ksys_chown(collected, uid, gid);
+ init_chown(collected, uid, gid, 0);
ksys_chmod(collected, mode);
dir_add(collected, mtime);
} else if (S_ISBLK(mode) || S_ISCHR(mode) ||
S_ISFIFO(mode) || S_ISSOCK(mode)) {
if (maybe_link() == 0) {
ksys_mknod(collected, mode, rdev);
- ksys_chown(collected, uid, gid);
+ init_chown(collected, uid, gid, 0);
ksys_chmod(collected, mode);
do_utime(collected, mtime);
}
@@ -394,7 +394,7 @@ static int __init do_symlink(void)
collected[N_ALIGN(name_len) + body_len] = '\0';
clean_path(collected, 0);
ksys_symlink(collected + N_ALIGN(name_len), collected);
- ksys_lchown(collected, uid, gid);
+ init_chown(collected, uid, gid, AT_SYMLINK_NOFOLLOW);
do_utime(collected, mtime);
state = SkipIt;
next_state = Reset;
--
2.27.0
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