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init: add an init_chmod helper

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Add a simple helper to chmod with a kernel space file name and switch
the early init code over to it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2020-07-22 11:41:02 +02:00
parent b873498f99
commit 1097742efc
6 changed files with 19 additions and 12 deletions
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13
fs/init.c
View file

@ -96,6 +96,19 @@ int __init init_chown(const char *filename, uid_t user, gid_t group, int flags)
return error;
}
int __init init_chmod(const char *filename, umode_t mode)
{
struct path path;
int error;
error = kern_path(filename, LOOKUP_FOLLOW, &path);
if (error)
return error;
error = chmod_common(&path, mode);
path_put(&path);
return error;
}
int __init init_unlink(const char *pathname)
{
return do_unlinkat(AT_FDCWD, getname_kernel(pathname));

2
fs/internal.h
View file

@ -131,7 +131,7 @@ extern struct open_how build_open_how(int flags, umode_t mode);
extern int build_open_flags(const struct open_how *how, struct open_flags *op);
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 chmod_common(const struct path *path, 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);

4
fs/open.c
View file

@ -563,7 +563,7 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename)
return error;
}
static int chmod_common(const struct path *path, umode_t mode)
int chmod_common(const struct path *path, umode_t mode)
{
struct inode *inode = path->dentry->d_inode;
struct inode *delegated_inode = NULL;
@ -610,7 +610,7 @@ SYSCALL_DEFINE2(fchmod, unsigned int, fd, umode_t, mode)
return err;
}
int do_fchmodat(int dfd, const char __user *filename, umode_t mode)
static int do_fchmodat(int dfd, const char __user *filename, umode_t mode)
{
struct path path;
int error;

1
include/linux/init_syscalls.h
View file

@ -6,5 +6,6 @@ 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_chmod(const char *filename, umode_t mode);
int __init init_unlink(const char *pathname);
int __init init_rmdir(const char *pathname);

7
include/linux/syscalls.h
View file

@ -1304,13 +1304,6 @@ static inline long ksys_link(const char __user *oldname,
return do_linkat(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
}
extern int do_fchmodat(int dfd, const char __user *filename, umode_t mode);
static inline int ksys_chmod(const char __user *filename, umode_t mode)
{
return do_fchmodat(AT_FDCWD, filename, mode);
}
long do_faccessat(int dfd, const char __user *filename, int mode, int flags);
static inline long ksys_access(const char __user *filename, int mode)

4
init/initramfs.c
View file

@ -350,14 +350,14 @@ static int __init do_name(void)
} else if (S_ISDIR(mode)) {
ksys_mkdir(collected, mode);
init_chown(collected, uid, gid, 0);
ksys_chmod(collected, mode);
init_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);
init_chown(collected, uid, gid, 0);
ksys_chmod(collected, mode);
init_chmod(collected, mode);
do_utime(collected, mtime);
}
}