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Subject[RFC PATCH 27/35] syscalls: do not call sys_mkdir{,at}() within the kernel
Date
CC: Al Viro <viro@zeniv.linux.org.uk>
CC: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
fs/internal.h | 1 +
fs/namei.c | 9 +++++++--
include/linux/syscalls.h | 6 ++++++
init/do_mounts_initrd.c | 2 +-
init/initramfs.c | 2 +-
init/noinitramfs.c | 4 ++--
6 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/fs/internal.h b/fs/internal.h
index 0eda35fa1743..53846bd4d9d7 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -55,6 +55,7 @@ extern void __init chrdev_init(void);
extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
const char *, unsigned int, struct path *);
+long do_mkdirat(int dfd, const char __user *pathname, umode_t mode);
long do_rmdir(int dfd, const char __user *pathname);
long do_unlinkat(int dfd, struct filename *name);

diff --git a/fs/namei.c b/fs/namei.c
index 8545151f74e9..dcf506227509 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3803,7 +3803,7 @@ int vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
}
EXPORT_SYMBOL(vfs_mkdir);

-SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
+long do_mkdirat(int dfd, const char __user *pathname, umode_t mode)
{
struct dentry *dentry;
struct path path;
@@ -3828,9 +3828,14 @@ SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
return error;
}

+SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
+{
+ return do_mkdirat(dfd, pathname, mode);
+}
+
SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode)
{
- return sys_mkdirat(AT_FDCWD, pathname, mode);
+ return do_mkdirat(AT_FDCWD, pathname, mode);
}

int vfs_rmdir(struct inode *dir, struct dentry *dentry)
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index bb610042a1ec..e7fb0295dbfc 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -979,4 +979,10 @@ static inline long ksys_rmdir(const char __user *pathname)
return do_rmdir(AT_FDCWD, pathname);
}

+extern long do_mkdirat(int dfd, const char __user *pathname, umode_t mode);
+static inline long ksys_mkdir(const char __user *pathname, umode_t mode)
+{
+ return do_mkdirat(AT_FDCWD, pathname, mode);
+}
+
#endif
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 784576b633fd..d30db6bbf014 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -60,7 +60,7 @@ static void __init handle_initrd(void)
create_dev("/dev/root.old", Root_RAM0);
/* mount initrd on rootfs' /root */
mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
- sys_mkdir("/old", 0700);
+ ksys_mkdir("/old", 0700);
ksys_chdir("/old");

/* try loading default modules from initrd */
diff --git a/init/initramfs.c b/init/initramfs.c
index 73bbb227f868..ca538a5f9fa9 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -352,7 +352,7 @@ static int __init do_name(void)
}
}
} else if (S_ISDIR(mode)) {
- sys_mkdir(collected, mode);
+ ksys_mkdir(collected, mode);
sys_chown(collected, uid, gid);
sys_chmod(collected, mode);
dir_add(collected, mtime);
diff --git a/init/noinitramfs.c b/init/noinitramfs.c
index 267739d85179..a08a9d937e60 100644
--- a/init/noinitramfs.c
+++ b/init/noinitramfs.c
@@ -29,7 +29,7 @@ static int __init default_rootfs(void)
{
int err;

- err = sys_mkdir((const char __user __force *) "/dev", 0755);
+ err = ksys_mkdir((const char __user __force *) "/dev", 0755);
if (err < 0)
goto out;

@@ -39,7 +39,7 @@ static int __init default_rootfs(void)
if (err < 0)
goto out;

- err = sys_mkdir((const char __user __force *) "/root", 0700);
+ err = ksys_mkdir((const char __user __force *) "/root", 0700);
if (err < 0)
goto out;

--
2.16.2
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