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authorChristoph Hellwig <hch@lst.de>2020-07-22 11:13:26 +0200
committerChristoph Hellwig <hch@lst.de>2020-07-31 08:17:52 +0200
commitb873498f99c77e7b5be3aa5ffe9ca67437232fe0 (patch)
tree6164c389372c34a25a5d1015d1d004a1c0250072
parent4b7ca5014cbef51cdb99fd644eae4f3773747a05 (diff)
init: add an init_chown helper
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>
-rw-r--r--fs/init.c18
-rw-r--r--fs/internal.h2
-rw-r--r--fs/open.c2
-rw-r--r--include/linux/init_syscalls.h1
-rw-r--r--init/initramfs.c6
5 files changed, 24 insertions, 5 deletions
diff --git a/fs/init.c b/fs/init.c
index 2c78f24814dd..edd024465595 100644
--- a/fs/init.c
+++ b/fs/init.c
@@ -78,6 +78,24 @@ dput_and_out:
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 491d1e63809b..e81b9e23c3ea 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 f62f4752bb43..49960a1248f1 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 e07099a14b91..0da59d76133e 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 1a9159bf452f..358dcd93cb9d 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);
}
@@ -393,7 +393,7 @@ 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;

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