diff options
Diffstat (limited to 'drivers/base/devtmpfs.c')
| -rw-r--r-- | drivers/base/devtmpfs.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index 8be352ab4ddb..e4bffeabf344 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -17,7 +17,7 @@ #include <linux/syscalls.h> #include <linux/mount.h> #include <linux/device.h> -#include <linux/genhd.h> +#include <linux/blkdev.h> #include <linux/namei.h> #include <linux/fs.h> #include <linux/shmem_fs.h> @@ -29,6 +29,12 @@ #include <uapi/linux/mount.h> #include "base.h" +#ifdef CONFIG_DEVTMPFS_SAFE +#define DEVTMPFS_MFLAGS (MS_SILENT | MS_NOEXEC | MS_NOSUID) +#else +#define DEVTMPFS_MFLAGS (MS_SILENT) +#endif + static struct task_struct *thread; static int __initdata mount_dev = IS_ENABLED(CONFIG_DEVTMPFS_MOUNT); @@ -59,8 +65,15 @@ static struct dentry *public_dev_mount(struct file_system_type *fs_type, int fla const char *dev_name, void *data) { struct super_block *s = mnt->mnt_sb; + int err; + atomic_inc(&s->s_active); down_write(&s->s_umount); + err = reconfigure_single(s, flags, data); + if (err < 0) { + deactivate_locked_super(s); + return ERR_PTR(err); + } return dget(s->s_root); } @@ -68,10 +81,8 @@ static struct file_system_type internal_fs_type = { .name = "devtmpfs", #ifdef CONFIG_TMPFS .init_fs_context = shmem_init_fs_context, - .parameters = shmem_fs_parameters, #else .init_fs_context = ramfs_init_fs_context, - .parameters = ramfs_fs_parameters, #endif .kill_sb = kill_litter_super, }; @@ -363,7 +374,7 @@ int __init devtmpfs_mount(void) if (!thread) return 0; - err = init_mount("devtmpfs", "dev", "devtmpfs", MS_SILENT, NULL); + err = init_mount("devtmpfs", "dev", "devtmpfs", DEVTMPFS_MFLAGS, NULL); if (err) printk(KERN_INFO "devtmpfs: error mounting %i\n", err); else @@ -412,7 +423,7 @@ static noinline int __init devtmpfs_setup(void *p) err = ksys_unshare(CLONE_NEWNS); if (err) goto out; - err = init_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, NULL); + err = init_mount("devtmpfs", "/", "devtmpfs", DEVTMPFS_MFLAGS, NULL); if (err) goto out; init_chdir("/.."); /* will traverse into overmounted root */ @@ -471,6 +482,7 @@ int __init devtmpfs_init(void) if (err) { printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err); unregister_filesystem(&dev_fs_type); + thread = NULL; return err; } |