From: Christoph Hellwig <hch@lst.de>
To: Al Viro <viro@zeniv.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org
Subject: [PATCH 11/24] fs: add a kern_chmod helper
Date: Mon, 20 Jul 2020 17:58:49 +0200 [thread overview]
Message-ID: <20200720155902.181712-12-hch@lst.de> (raw)
In-Reply-To: <20200720155902.181712-1-hch@lst.de>
Add a simple helper to chown with a kernel space name and use it in the
early init code instead of relying on the implicit set_fs(KERNEL_DS)
there. Remove the now unused ksys_chmod.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/internal.h | 1 -
fs/open.c | 28 +++++++++++++++++-----------
include/linux/fs.h | 1 +
include/linux/syscalls.h | 7 -------
init/initramfs.c | 4 ++--
5 files changed, 20 insertions(+), 21 deletions(-)
diff --git a/fs/internal.h b/fs/internal.h
index ad62729e7ae587..1e2b425f56ee9e 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -126,7 +126,6 @@ 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);
extern int vfs_open(const struct path *, struct file *);
diff --git a/fs/open.c b/fs/open.c
index 8157db254c8f8a..bb8ffc24c4b034 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -643,33 +643,39 @@ 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, struct filename *name, umode_t mode)
{
struct path path;
int error;
unsigned int lookup_flags = LOOKUP_FOLLOW;
retry:
- error = user_path_at(dfd, filename, lookup_flags, &path);
- if (!error) {
- error = chmod_common(&path, mode);
- path_put(&path);
- if (retry_estale(error, lookup_flags)) {
- lookup_flags |= LOOKUP_REVAL;
- goto retry;
- }
+ error = filename_lookup(dfd, name, lookup_flags, &path, NULL);
+ if (error)
+ return error;
+ error = chmod_common(&path, mode);
+ path_put(&path);
+ if (retry_estale(error, lookup_flags)) {
+ lookup_flags |= LOOKUP_REVAL;
+ goto retry;
}
+ putname(name);
return error;
}
+int __init kern_chmod(const char *filename, umode_t mode)
+{
+ return do_fchmodat(AT_FDCWD, getname_kernel(filename), mode);
+}
+
SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename,
umode_t, mode)
{
- return do_fchmodat(dfd, filename, mode);
+ return do_fchmodat(dfd, getname(filename), mode);
}
SYSCALL_DEFINE2(chmod, const char __user *, filename, umode_t, mode)
{
- return do_fchmodat(AT_FDCWD, filename, mode);
+ return do_fchmodat(AT_FDCWD, getname(filename), mode);
}
static int chown_common(const struct path *path, uid_t user, gid_t group)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 75d6ef7e1de52b..ca034126cb0e4d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3675,5 +3675,6 @@ int kern_chdir(const char *filename);
int kern_chroot(const char *filename);
int __init kern_access(const char *filename, int mode);
int __init kern_chown(const char *filename, uid_t user, gid_t group, int flag);
+int __init kern_chmod(const char *filename, umode_t mode);
#endif /* _LINUX_FS_H */
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 82346a68a73877..a2ece4cc8692f5 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1318,13 +1318,6 @@ 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);
-}
-
extern long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
static inline long ksys_ftruncate(unsigned int fd, loff_t length)
diff --git a/init/initramfs.c b/init/initramfs.c
index 45e4ddb63caba1..2c2d4480d495e8 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -346,14 +346,14 @@ static int __init do_name(void)
} else if (S_ISDIR(mode)) {
ksys_mkdir(collected, mode);
kern_chown(collected, uid, gid, 0);
- ksys_chmod(collected, mode);
+ kern_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);
kern_chown(collected, uid, gid, 0);
- ksys_chmod(collected, mode);
+ kern_chmod(collected, mode);
do_utime(collected, mtime);
}
}
--
2.27.0
next prev parent reply other threads:[~2020-07-20 15:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-20 15:58 add file system helpers that take kernel pointers for the init code Christoph Hellwig
2020-07-20 15:58 ` [PATCH 01/24] init: initialize ramdisk_execute_command at compile time Christoph Hellwig
2020-07-20 15:58 ` [PATCH 02/24] fs: add a do_kern_mount helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 03/24] fs: add a kern_umount helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 04/24] fs: move the putname from filename_create to the callers Christoph Hellwig
2020-07-20 18:05 ` Linus Torvalds
2020-07-20 15:58 ` [PATCH 05/24] fs: move the putname from filename_lookup " Christoph Hellwig
2020-07-20 18:11 ` Al Viro
2020-07-20 15:58 ` [PATCH 06/24] fs: add a kern_chdir helper Christoph Hellwig
2020-07-20 18:17 ` Al Viro
2020-07-20 15:58 ` [PATCH 07/24] fs: add a kern_chroot helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 08/24] fs: add a kern_access helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 09/24] fs: add a kern_chown helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 10/24] fs: move the uid16 (f)chown syscalls to fs/open.c Christoph Hellwig
2020-07-20 15:58 ` Christoph Hellwig [this message]
2020-07-20 15:58 ` [PATCH 12/24] fs: add a kern_utimes helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 13/24] fs: add a kern_mkdir helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 14/24] fs: add a kern_mknod helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 15/24] fs: add a kern_link helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 16/24] fs: add a kern_symlink helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 17/24] fs: add a kern_unlink helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 18/24] fs: add a kern_rmdir helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 19/24] fs: remove vfs_statx_fd Christoph Hellwig
2020-07-20 15:58 ` [PATCH 20/24] fs: implement vfs_stat and vfs_lstat in terms of vfs_fstatat Christoph Hellwig
2020-07-20 15:58 ` [PATCH 21/24] fs: move vfs_fstatat out of line Christoph Hellwig
2020-07-20 15:59 ` [PATCH 22/24] fs: remove vfs_stat_set_lookup_flags Christoph Hellwig
2020-07-20 15:59 ` [PATCH 23/24] fs: remove KSTAT_QUERY_FLAGS Christoph Hellwig
2020-07-20 15:59 ` [PATCH 24/24] fs: add a kern_stat helper Christoph Hellwig
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