lkml.org 
[lkml]   [2019]   [Dec]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 3/3] init: use do_mount() instead of ksys_mount()
    Date
    In prepare_namespace(), do_mount() can be used instead of ksys_mount()
    as the first and third argument are const strings in the kernel, the
    second and fourth argument are passed through anyway, and the fifth
    argument is NULL.

    In do_mount_root(), ksys_mount() is called with the first and third
    argument being already kernelspace strings, which do not need to be
    copied over from userspace to kernelspace (again). The second and
    fourth arguments are passed through to do_mount() anyway. The fifth
    argument, while already residing in kernelspace, needs to be put into
    a page of its own. Then, do_mount() can be used instead of
    ksys_mount().

    Once this is done, there are no in-kernel users to ksys_mount() left,
    which can therefore be removed.

    Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
    ---
    fs/namespace.c | 10 ++--------
    include/linux/syscalls.h | 2 --
    init/do_mounts.c | 28 ++++++++++++++++++++++------
    3 files changed, 24 insertions(+), 16 deletions(-)

    diff --git a/fs/namespace.c b/fs/namespace.c
    index 2fd0c8bcb8c1..be601d3a8008 100644
    --- a/fs/namespace.c
    +++ b/fs/namespace.c
    @@ -3325,8 +3325,8 @@ struct dentry *mount_subtree(struct vfsmount *m, const char *name)
    }
    EXPORT_SYMBOL(mount_subtree);

    -int ksys_mount(const char __user *dev_name, const char __user *dir_name,
    - const char __user *type, unsigned long flags, void __user *data)
    +SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
    + char __user *, type, unsigned long, flags, void __user *, data)
    {
    int ret;
    char *kernel_type;
    @@ -3359,12 +3359,6 @@ int ksys_mount(const char __user *dev_name, const char __user *dir_name,
    return ret;
    }

    -SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
    - char __user *, type, unsigned long, flags, void __user *, data)
    -{
    - return ksys_mount(dev_name, dir_name, type, flags, data);
    -}
    -
    /*
    * Create a kernel mount representation for a new, prepared superblock
    * (specified by fs_fd) and attach to an open_tree-like file descriptor.
    diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
    index d0391cc2dae9..5262b7a76d39 100644
    --- a/include/linux/syscalls.h
    +++ b/include/linux/syscalls.h
    @@ -1231,8 +1231,6 @@ asmlinkage long sys_ni_syscall(void);
    * the ksys_xyzyyz() functions prototyped below.
    */

    -int ksys_mount(const char __user *dev_name, const char __user *dir_name,
    - const char __user *type, unsigned long flags, void __user *data);
    int ksys_umount(char __user *name, int flags);
    int ksys_dup(unsigned int fildes);
    int ksys_chroot(const char __user *filename);
    diff --git a/init/do_mounts.c b/init/do_mounts.c
    index 43f6d098c880..f55cbd9cb818 100644
    --- a/init/do_mounts.c
    +++ b/init/do_mounts.c
    @@ -387,12 +387,25 @@ static void __init get_fs_names(char *page)
    *s = '\0';
    }

    -static int __init do_mount_root(char *name, char *fs, int flags, void *data)
    +static int __init do_mount_root(const char *name, const char *fs,
    + const int flags, const void *data)
    {
    struct super_block *s;
    - int err = ksys_mount(name, "/root", fs, flags, data);
    - if (err)
    - return err;
    + char *data_page;
    + struct page *p;
    + int ret;
    +
    + /* do_mount() requires a full page as fifth argument */
    + p = alloc_page(GFP_KERNEL);
    + if (!p)
    + return -ENOMEM;
    +
    + data_page = page_address(p);
    + strncpy(data_page, data, PAGE_SIZE - 1);
    +
    + ret = do_mount(name, "/root", fs, flags, data_page);
    + if (ret)
    + goto out;

    ksys_chdir("/root");
    s = current->fs->pwd.dentry->d_sb;
    @@ -402,7 +415,10 @@ static int __init do_mount_root(char *name, char *fs, int flags, void *data)
    s->s_type->name,
    sb_rdonly(s) ? " readonly" : "",
    MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
    - return 0;
    +
    +out:
    + put_page(p);
    + return ret;
    }

    void __init mount_block_root(char *name, int flags)
    @@ -671,7 +687,7 @@ void __init prepare_namespace(void)
    mount_root();
    out:
    devtmpfs_mount();
    - ksys_mount(".", "/", NULL, MS_MOVE, NULL);
    + do_mount(".", "/", NULL, MS_MOVE, NULL);
    ksys_chroot(".");
    }

    --
    2.24.1
    \
     
     \ /
      Last update: 2019-12-12 15:00    [W:3.872 / U:0.300 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site