| Message ID | 20190612004258.GX1871505@magnolia (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | [v2,1/4] vfs: create a generic checking function for FS_IOC_SETFLAGS | expand |
On Tue 11-06-19 17:42:58, Darrick J. Wong wrote: > From: Darrick J. Wong <darrick.wong@oracle.com> > > Create a generic checking function for the incoming FS_IOC_SETFLAGS flag > values so that we can standardize the implementations that follow ext4's > flag values. > > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> The patch looks good to me. You can add: Reviewed-by: Jan Kara <jack@suse.cz> Honza > --- > v2: fix jfs locking and remove its opencoded flags check > --- > fs/btrfs/ioctl.c | 13 +++++-------- > fs/efivarfs/file.c | 18 +++++++++++++----- > fs/ext2/ioctl.c | 16 ++++------------ > fs/ext4/ioctl.c | 13 +++---------- > fs/f2fs/file.c | 7 ++++--- > fs/gfs2/file.c | 42 +++++++++++++++++++++++++++++------------- > fs/hfsplus/ioctl.c | 21 ++++++++++++--------- > fs/inode.c | 17 +++++++++++++++++ > fs/jfs/ioctl.c | 22 +++++++--------------- > fs/nilfs2/ioctl.c | 9 ++------- > fs/ocfs2/ioctl.c | 13 +++---------- > fs/reiserfs/ioctl.c | 10 ++++------ > fs/ubifs/ioctl.c | 13 +++---------- > include/linux/fs.h | 2 ++ > 14 files changed, 108 insertions(+), 108 deletions(-) > > diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c > index 6dafa857bbb9..f408aa93b0cf 100644 > --- a/fs/btrfs/ioctl.c > +++ b/fs/btrfs/ioctl.c > @@ -187,7 +187,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg) > struct btrfs_inode *binode = BTRFS_I(inode); > struct btrfs_root *root = binode->root; > struct btrfs_trans_handle *trans; > - unsigned int fsflags; > + unsigned int fsflags, old_fsflags; > int ret; > const char *comp = NULL; > u32 binode_flags = binode->flags; > @@ -212,13 +212,10 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg) > inode_lock(inode); > > fsflags = btrfs_mask_fsflags_for_type(inode, fsflags); > - if ((fsflags ^ btrfs_inode_flags_to_fsflags(binode->flags)) & > - (FS_APPEND_FL | FS_IMMUTABLE_FL)) { > - if (!capable(CAP_LINUX_IMMUTABLE)) { > - ret = -EPERM; > - goto out_unlock; > - } > - } > + old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags); > + ret = vfs_ioc_setflags_check(inode, old_fsflags, fsflags); > + if (ret) > + goto out_unlock; > > if (fsflags & FS_SYNC_FL) > binode_flags |= BTRFS_INODE_SYNC; > diff --git a/fs/efivarfs/file.c b/fs/efivarfs/file.c > index 8e568428c88b..f4f6c1bec132 100644 > --- a/fs/efivarfs/file.c > +++ b/fs/efivarfs/file.c > @@ -110,16 +110,22 @@ static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, > return size; > } > > -static int > -efivarfs_ioc_getxflags(struct file *file, void __user *arg) > +static inline unsigned int efivarfs_getflags(struct inode *inode) > { > - struct inode *inode = file->f_mapping->host; > unsigned int i_flags; > unsigned int flags = 0; > > i_flags = inode->i_flags; > if (i_flags & S_IMMUTABLE) > flags |= FS_IMMUTABLE_FL; > + return flags; > +} > + > +static int > +efivarfs_ioc_getxflags(struct file *file, void __user *arg) > +{ > + struct inode *inode = file->f_mapping->host; > + unsigned int flags = efivarfs_getflags(inode); > > if (copy_to_user(arg, &flags, sizeof(flags))) > return -EFAULT; > @@ -132,6 +138,7 @@ efivarfs_ioc_setxflags(struct file *file, void __user *arg) > struct inode *inode = file->f_mapping->host; > unsigned int flags; > unsigned int i_flags = 0; > + unsigned int oldflags = efivarfs_getflags(inode); > int error; > > if (!inode_owner_or_capable(inode)) > @@ -143,8 +150,9 @@ efivarfs_ioc_setxflags(struct file *file, void __user *arg) > if (flags & ~FS_IMMUTABLE_FL) > return -EOPNOTSUPP; > > - if (!capable(CAP_LINUX_IMMUTABLE)) > - return -EPERM; > + error = vfs_ioc_setflags_check(inode, oldflags, flags); > + if (error) > + return error; > > if (flags & FS_IMMUTABLE_FL) > i_flags |= S_IMMUTABLE; > diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c > index 0367c0039e68..88b3b9720023 100644 > --- a/fs/ext2/ioctl.c > +++ b/fs/ext2/ioctl.c > @@ -60,18 +60,10 @@ long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > } > oldflags = ei->i_flags; > > - /* > - * The IMMUTABLE and APPEND_ONLY flags can only be changed by > - * the relevant capability. > - * > - * This test looks nicer. Thanks to Pauline Middelink > - */ > - if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { > - if (!capable(CAP_LINUX_IMMUTABLE)) { > - inode_unlock(inode); > - ret = -EPERM; > - goto setflags_out; > - } > + ret = vfs_ioc_setflags_check(inode, oldflags, flags); > + if (ret) { > + inode_unlock(inode); > + goto setflags_out; > } > > flags = flags & EXT2_FL_USER_MODIFIABLE; > diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c > index e486e49b31ed..5126ee351a84 100644 > --- a/fs/ext4/ioctl.c > +++ b/fs/ext4/ioctl.c > @@ -289,16 +289,9 @@ static int ext4_ioctl_setflags(struct inode *inode, > /* The JOURNAL_DATA flag is modifiable only by root */ > jflag = flags & EXT4_JOURNAL_DATA_FL; > > - /* > - * The IMMUTABLE and APPEND_ONLY flags can only be changed by > - * the relevant capability. > - * > - * This test looks nicer. Thanks to Pauline Middelink > - */ > - if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { > - if (!capable(CAP_LINUX_IMMUTABLE)) > - goto flags_out; > - } > + err = vfs_ioc_setflags_check(inode, oldflags, flags); > + if (err) > + goto flags_out; > > /* > * The JOURNAL_DATA flag can only be changed by > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c > index 45b45f37d347..a969d5497e03 100644 > --- a/fs/f2fs/file.c > +++ b/fs/f2fs/file.c > @@ -1670,6 +1670,7 @@ static int __f2fs_ioc_setflags(struct inode *inode, unsigned int flags) > { > struct f2fs_inode_info *fi = F2FS_I(inode); > unsigned int oldflags; > + int err; > > /* Is it quota file? Do not allow user to mess with it */ > if (IS_NOQUOTA(inode)) > @@ -1679,9 +1680,9 @@ static int __f2fs_ioc_setflags(struct inode *inode, unsigned int flags) > > oldflags = fi->i_flags; > > - if ((flags ^ oldflags) & (F2FS_APPEND_FL | F2FS_IMMUTABLE_FL)) > - if (!capable(CAP_LINUX_IMMUTABLE)) > - return -EPERM; > + err = vfs_ioc_setflags_check(inode, oldflags, flags); > + if (err) > + return err; > > flags = flags & F2FS_FL_USER_MODIFIABLE; > flags |= oldflags & ~F2FS_FL_USER_MODIFIABLE; > diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c > index d174b1f8fd08..99f53cf699c6 100644 > --- a/fs/gfs2/file.c > +++ b/fs/gfs2/file.c > @@ -136,27 +136,36 @@ static struct { > {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA}, > }; > > +static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags) > +{ > + int i; > + u32 fsflags = 0; > + > + if (S_ISDIR(inode->i_mode)) > + gfsflags &= ~GFS2_DIF_JDATA; > + else > + gfsflags &= ~GFS2_DIF_INHERIT_JDATA; > + > + for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) > + if (gfsflags & fsflag_gfs2flag[i].gfsflag) > + fsflags |= fsflag_gfs2flag[i].fsflag; > + return fsflags; > +} > + > static int gfs2_get_flags(struct file *filp, u32 __user *ptr) > { > struct inode *inode = file_inode(filp); > struct gfs2_inode *ip = GFS2_I(inode); > struct gfs2_holder gh; > - int i, error; > - u32 gfsflags, fsflags = 0; > + int error; > + u32 fsflags; > > gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); > error = gfs2_glock_nq(&gh); > if (error) > goto out_uninit; > > - gfsflags = ip->i_diskflags; > - if (S_ISDIR(inode->i_mode)) > - gfsflags &= ~GFS2_DIF_JDATA; > - else > - gfsflags &= ~GFS2_DIF_INHERIT_JDATA; > - for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) > - if (gfsflags & fsflag_gfs2flag[i].gfsflag) > - fsflags |= fsflag_gfs2flag[i].fsflag; > + fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags); > > if (put_user(fsflags, ptr)) > error = -EFAULT; > @@ -200,9 +209,11 @@ void gfs2_set_inode_flags(struct inode *inode) > * @filp: file pointer > * @reqflags: The flags to set > * @mask: Indicates which flags are valid > + * @fsflags: The FS_* inode flags passed in > * > */ > -static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) > +static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask, > + const u32 fsflags) > { > struct inode *inode = file_inode(filp); > struct gfs2_inode *ip = GFS2_I(inode); > @@ -210,7 +221,7 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) > struct buffer_head *bh; > struct gfs2_holder gh; > int error; > - u32 new_flags, flags; > + u32 new_flags, flags, oldflags; > > error = mnt_want_write_file(filp); > if (error) > @@ -220,6 +231,11 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) > if (error) > goto out_drop_write; > > + oldflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags); > + error = vfs_ioc_setflags_check(inode, oldflags, fsflags); > + if (error) > + goto out; > + > error = -EACCES; > if (!inode_owner_or_capable(inode)) > goto out; > @@ -308,7 +324,7 @@ static int gfs2_set_flags(struct file *filp, u32 __user *ptr) > mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA); > } > > - return do_gfs2_set_flags(filp, gfsflags, mask); > + return do_gfs2_set_flags(filp, gfsflags, mask, fsflags); > } > > static int gfs2_getlabel(struct file *filp, char __user *label) > diff --git a/fs/hfsplus/ioctl.c b/fs/hfsplus/ioctl.c > index 5e6502ef7415..862a3c9481d7 100644 > --- a/fs/hfsplus/ioctl.c > +++ b/fs/hfsplus/ioctl.c > @@ -57,9 +57,8 @@ static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags) > return 0; > } > > -static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags) > +static inline unsigned int hfsplus_getflags(struct inode *inode) > { > - struct inode *inode = file_inode(file); > struct hfsplus_inode_info *hip = HFSPLUS_I(inode); > unsigned int flags = 0; > > @@ -69,6 +68,13 @@ static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags) > flags |= FS_APPEND_FL; > if (hip->userflags & HFSPLUS_FLG_NODUMP) > flags |= FS_NODUMP_FL; > + return flags; > +} > + > +static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags) > +{ > + struct inode *inode = file_inode(file); > + unsigned int flags = hfsplus_getflags(inode); > > return put_user(flags, user_flags); > } > @@ -78,6 +84,7 @@ static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags) > struct inode *inode = file_inode(file); > struct hfsplus_inode_info *hip = HFSPLUS_I(inode); > unsigned int flags, new_fl = 0; > + unsigned int oldflags = hfsplus_getflags(inode); > int err = 0; > > err = mnt_want_write_file(file); > @@ -96,13 +103,9 @@ static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags) > > inode_lock(inode); > > - if ((flags & (FS_IMMUTABLE_FL|FS_APPEND_FL)) || > - inode->i_flags & (S_IMMUTABLE|S_APPEND)) { > - if (!capable(CAP_LINUX_IMMUTABLE)) { > - err = -EPERM; > - goto out_unlock_inode; > - } > - } > + err = vfs_ioc_setflags_check(inode, oldflags, flags); > + if (err) > + goto out_unlock_inode; > > /* don't silently ignore unsupported ext2 flags */ > if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) { > diff --git a/fs/inode.c b/fs/inode.c > index df6542ec3b88..0ce60b720608 100644 > --- a/fs/inode.c > +++ b/fs/inode.c > @@ -2170,3 +2170,20 @@ struct timespec64 current_time(struct inode *inode) > return timespec64_trunc(now, inode->i_sb->s_time_gran); > } > EXPORT_SYMBOL(current_time); > + > +/* Generic function to check FS_IOC_SETFLAGS values. */ > +int vfs_ioc_setflags_check(struct inode *inode, int oldflags, int flags) > +{ > + /* > + * The IMMUTABLE and APPEND_ONLY flags can only be changed by > + * the relevant capability. > + * > + * This test looks nicer. Thanks to Pauline Middelink > + */ > + if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) && > + !capable(CAP_LINUX_IMMUTABLE)) > + return -EPERM; > + > + return 0; > +} > +EXPORT_SYMBOL(vfs_ioc_setflags_check); > diff --git a/fs/jfs/ioctl.c b/fs/jfs/ioctl.c > index ba34dae8bd9f..b485c2d7620f 100644 > --- a/fs/jfs/ioctl.c > +++ b/fs/jfs/ioctl.c > @@ -98,24 +98,16 @@ long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > /* Lock against other parallel changes of flags */ > inode_lock(inode); > > - oldflags = jfs_inode->mode2; > - > - /* > - * The IMMUTABLE and APPEND_ONLY flags can only be changed by > - * the relevant capability. > - */ > - if ((oldflags & JFS_IMMUTABLE_FL) || > - ((flags ^ oldflags) & > - (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) { > - if (!capable(CAP_LINUX_IMMUTABLE)) { > - inode_unlock(inode); > - err = -EPERM; > - goto setflags_out; > - } > + oldflags = jfs_map_ext2(jfs_inode->mode2 & JFS_FL_USER_VISIBLE, > + 0); > + err = vfs_ioc_setflags_check(inode, oldflags, flags); > + if (err) { > + inode_unlock(inode); > + goto setflags_out; > } > > flags = flags & JFS_FL_USER_MODIFIABLE; > - flags |= oldflags & ~JFS_FL_USER_MODIFIABLE; > + flags |= jfs_inode->mode2 & ~JFS_FL_USER_MODIFIABLE; > jfs_inode->mode2 = flags; > > jfs_set_inode_flags(inode); > diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c > index 9b96d79eea6c..0632336d2515 100644 > --- a/fs/nilfs2/ioctl.c > +++ b/fs/nilfs2/ioctl.c > @@ -148,13 +148,8 @@ static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp, > > oldflags = NILFS_I(inode)->i_flags; > > - /* > - * The IMMUTABLE and APPEND_ONLY flags can only be changed by the > - * relevant capability. > - */ > - ret = -EPERM; > - if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) && > - !capable(CAP_LINUX_IMMUTABLE)) > + ret = vfs_ioc_setflags_check(inode, oldflags, flags); > + if (ret) > goto out; > > ret = nilfs_transaction_begin(inode->i_sb, &ti, 0); > diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c > index 994726ada857..467a2faf0305 100644 > --- a/fs/ocfs2/ioctl.c > +++ b/fs/ocfs2/ioctl.c > @@ -106,16 +106,9 @@ static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags, > flags = flags & mask; > flags |= oldflags & ~mask; > > - /* > - * The IMMUTABLE and APPEND_ONLY flags can only be changed by > - * the relevant capability. > - */ > - status = -EPERM; > - if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) & > - (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) { > - if (!capable(CAP_LINUX_IMMUTABLE)) > - goto bail_unlock; > - } > + status = vfs_ioc_setflags_check(inode, oldflags, flags); > + if (status) > + goto bail_unlock; > > handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); > if (IS_ERR(handle)) { > diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c > index acbbaf7a0bb2..92bcb1ecd994 100644 > --- a/fs/reiserfs/ioctl.c > +++ b/fs/reiserfs/ioctl.c > @@ -74,13 +74,11 @@ long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > err = -EPERM; > goto setflags_out; > } > - if (((flags ^ REISERFS_I(inode)-> > - i_attrs) & (REISERFS_IMMUTABLE_FL | > - REISERFS_APPEND_FL)) > - && !capable(CAP_LINUX_IMMUTABLE)) { > - err = -EPERM; > + err = vfs_ioc_setflags_check(inode, > + REISERFS_I(inode)->i_attrs, > + flags); > + if (err) > goto setflags_out; > - } > if ((flags & REISERFS_NOTAIL_FL) && > S_ISREG(inode->i_mode)) { > int result; > diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c > index 4f1a397fda69..bdea836fc38b 100644 > --- a/fs/ubifs/ioctl.c > +++ b/fs/ubifs/ioctl.c > @@ -107,18 +107,11 @@ static int setflags(struct inode *inode, int flags) > if (err) > return err; > > - /* > - * The IMMUTABLE and APPEND_ONLY flags can only be changed by > - * the relevant capability. > - */ > mutex_lock(&ui->ui_mutex); > oldflags = ubifs2ioctl(ui->flags); > - if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { > - if (!capable(CAP_LINUX_IMMUTABLE)) { > - err = -EPERM; > - goto out_unlock; > - } > - } > + err = vfs_ioc_setflags_check(inode, oldflags, flags); > + if (err) > + goto out_unlock; > > ui->flags = ioctl2ubifs(flags); > ubifs_set_inode_flags(inode); > diff --git a/include/linux/fs.h b/include/linux/fs.h > index f7fdfe93e25d..1825d055808c 100644 > --- a/include/linux/fs.h > +++ b/include/linux/fs.h > @@ -3546,4 +3546,6 @@ static inline struct sock *io_uring_get_socket(struct file *file) > } > #endif > > +int vfs_ioc_setflags_check(struct inode *inode, int oldflags, int flags); > + > #endif /* _LINUX_FS_H */ >
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 6dafa857bbb9..f408aa93b0cf 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -187,7 +187,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg) struct btrfs_inode *binode = BTRFS_I(inode); struct btrfs_root *root = binode->root; struct btrfs_trans_handle *trans; - unsigned int fsflags; + unsigned int fsflags, old_fsflags; int ret; const char *comp = NULL; u32 binode_flags = binode->flags; @@ -212,13 +212,10 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg) inode_lock(inode); fsflags = btrfs_mask_fsflags_for_type(inode, fsflags); - if ((fsflags ^ btrfs_inode_flags_to_fsflags(binode->flags)) & - (FS_APPEND_FL | FS_IMMUTABLE_FL)) { - if (!capable(CAP_LINUX_IMMUTABLE)) { - ret = -EPERM; - goto out_unlock; - } - } + old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags); + ret = vfs_ioc_setflags_check(inode, old_fsflags, fsflags); + if (ret) + goto out_unlock; if (fsflags & FS_SYNC_FL) binode_flags |= BTRFS_INODE_SYNC; diff --git a/fs/efivarfs/file.c b/fs/efivarfs/file.c index 8e568428c88b..f4f6c1bec132 100644 --- a/fs/efivarfs/file.c +++ b/fs/efivarfs/file.c @@ -110,16 +110,22 @@ static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, return size; } -static int -efivarfs_ioc_getxflags(struct file *file, void __user *arg) +static inline unsigned int efivarfs_getflags(struct inode *inode) { - struct inode *inode = file->f_mapping->host; unsigned int i_flags; unsigned int flags = 0; i_flags = inode->i_flags; if (i_flags & S_IMMUTABLE) flags |= FS_IMMUTABLE_FL; + return flags; +} + +static int +efivarfs_ioc_getxflags(struct file *file, void __user *arg) +{ + struct inode *inode = file->f_mapping->host; + unsigned int flags = efivarfs_getflags(inode); if (copy_to_user(arg, &flags, sizeof(flags))) return -EFAULT; @@ -132,6 +138,7 @@ efivarfs_ioc_setxflags(struct file *file, void __user *arg) struct inode *inode = file->f_mapping->host; unsigned int flags; unsigned int i_flags = 0; + unsigned int oldflags = efivarfs_getflags(inode); int error; if (!inode_owner_or_capable(inode)) @@ -143,8 +150,9 @@ efivarfs_ioc_setxflags(struct file *file, void __user *arg) if (flags & ~FS_IMMUTABLE_FL) return -EOPNOTSUPP; - if (!capable(CAP_LINUX_IMMUTABLE)) - return -EPERM; + error = vfs_ioc_setflags_check(inode, oldflags, flags); + if (error) + return error; if (flags & FS_IMMUTABLE_FL) i_flags |= S_IMMUTABLE; diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c index 0367c0039e68..88b3b9720023 100644 --- a/fs/ext2/ioctl.c +++ b/fs/ext2/ioctl.c @@ -60,18 +60,10 @@ long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) } oldflags = ei->i_flags; - /* - * The IMMUTABLE and APPEND_ONLY flags can only be changed by - * the relevant capability. - * - * This test looks nicer. Thanks to Pauline Middelink - */ - if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { - if (!capable(CAP_LINUX_IMMUTABLE)) { - inode_unlock(inode); - ret = -EPERM; - goto setflags_out; - } + ret = vfs_ioc_setflags_check(inode, oldflags, flags); + if (ret) { + inode_unlock(inode); + goto setflags_out; } flags = flags & EXT2_FL_USER_MODIFIABLE; diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index e486e49b31ed..5126ee351a84 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -289,16 +289,9 @@ static int ext4_ioctl_setflags(struct inode *inode, /* The JOURNAL_DATA flag is modifiable only by root */ jflag = flags & EXT4_JOURNAL_DATA_FL; - /* - * The IMMUTABLE and APPEND_ONLY flags can only be changed by - * the relevant capability. - * - * This test looks nicer. Thanks to Pauline Middelink - */ - if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { - if (!capable(CAP_LINUX_IMMUTABLE)) - goto flags_out; - } + err = vfs_ioc_setflags_check(inode, oldflags, flags); + if (err) + goto flags_out; /* * The JOURNAL_DATA flag can only be changed by diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 45b45f37d347..a969d5497e03 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1670,6 +1670,7 @@ static int __f2fs_ioc_setflags(struct inode *inode, unsigned int flags) { struct f2fs_inode_info *fi = F2FS_I(inode); unsigned int oldflags; + int err; /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) @@ -1679,9 +1680,9 @@ static int __f2fs_ioc_setflags(struct inode *inode, unsigned int flags) oldflags = fi->i_flags; - if ((flags ^ oldflags) & (F2FS_APPEND_FL | F2FS_IMMUTABLE_FL)) - if (!capable(CAP_LINUX_IMMUTABLE)) - return -EPERM; + err = vfs_ioc_setflags_check(inode, oldflags, flags); + if (err) + return err; flags = flags & F2FS_FL_USER_MODIFIABLE; flags |= oldflags & ~F2FS_FL_USER_MODIFIABLE; diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index d174b1f8fd08..99f53cf699c6 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -136,27 +136,36 @@ static struct { {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA}, }; +static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags) +{ + int i; + u32 fsflags = 0; + + if (S_ISDIR(inode->i_mode)) + gfsflags &= ~GFS2_DIF_JDATA; + else + gfsflags &= ~GFS2_DIF_INHERIT_JDATA; + + for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) + if (gfsflags & fsflag_gfs2flag[i].gfsflag) + fsflags |= fsflag_gfs2flag[i].fsflag; + return fsflags; +} + static int gfs2_get_flags(struct file *filp, u32 __user *ptr) { struct inode *inode = file_inode(filp); struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; - int i, error; - u32 gfsflags, fsflags = 0; + int error; + u32 fsflags; gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); error = gfs2_glock_nq(&gh); if (error) goto out_uninit; - gfsflags = ip->i_diskflags; - if (S_ISDIR(inode->i_mode)) - gfsflags &= ~GFS2_DIF_JDATA; - else - gfsflags &= ~GFS2_DIF_INHERIT_JDATA; - for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) - if (gfsflags & fsflag_gfs2flag[i].gfsflag) - fsflags |= fsflag_gfs2flag[i].fsflag; + fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags); if (put_user(fsflags, ptr)) error = -EFAULT; @@ -200,9 +209,11 @@ void gfs2_set_inode_flags(struct inode *inode) * @filp: file pointer * @reqflags: The flags to set * @mask: Indicates which flags are valid + * @fsflags: The FS_* inode flags passed in * */ -static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) +static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask, + const u32 fsflags) { struct inode *inode = file_inode(filp); struct gfs2_inode *ip = GFS2_I(inode); @@ -210,7 +221,7 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) struct buffer_head *bh; struct gfs2_holder gh; int error; - u32 new_flags, flags; + u32 new_flags, flags, oldflags; error = mnt_want_write_file(filp); if (error) @@ -220,6 +231,11 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) if (error) goto out_drop_write; + oldflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags); + error = vfs_ioc_setflags_check(inode, oldflags, fsflags); + if (error) + goto out; + error = -EACCES; if (!inode_owner_or_capable(inode)) goto out; @@ -308,7 +324,7 @@ static int gfs2_set_flags(struct file *filp, u32 __user *ptr) mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA); } - return do_gfs2_set_flags(filp, gfsflags, mask); + return do_gfs2_set_flags(filp, gfsflags, mask, fsflags); } static int gfs2_getlabel(struct file *filp, char __user *label) diff --git a/fs/hfsplus/ioctl.c b/fs/hfsplus/ioctl.c index 5e6502ef7415..862a3c9481d7 100644 --- a/fs/hfsplus/ioctl.c +++ b/fs/hfsplus/ioctl.c @@ -57,9 +57,8 @@ static int hfsplus_ioctl_bless(struct file *file, int __user *user_flags) return 0; } -static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags) +static inline unsigned int hfsplus_getflags(struct inode *inode) { - struct inode *inode = file_inode(file); struct hfsplus_inode_info *hip = HFSPLUS_I(inode); unsigned int flags = 0; @@ -69,6 +68,13 @@ static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags) flags |= FS_APPEND_FL; if (hip->userflags & HFSPLUS_FLG_NODUMP) flags |= FS_NODUMP_FL; + return flags; +} + +static int hfsplus_ioctl_getflags(struct file *file, int __user *user_flags) +{ + struct inode *inode = file_inode(file); + unsigned int flags = hfsplus_getflags(inode); return put_user(flags, user_flags); } @@ -78,6 +84,7 @@ static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags) struct inode *inode = file_inode(file); struct hfsplus_inode_info *hip = HFSPLUS_I(inode); unsigned int flags, new_fl = 0; + unsigned int oldflags = hfsplus_getflags(inode); int err = 0; err = mnt_want_write_file(file); @@ -96,13 +103,9 @@ static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags) inode_lock(inode); - if ((flags & (FS_IMMUTABLE_FL|FS_APPEND_FL)) || - inode->i_flags & (S_IMMUTABLE|S_APPEND)) { - if (!capable(CAP_LINUX_IMMUTABLE)) { - err = -EPERM; - goto out_unlock_inode; - } - } + err = vfs_ioc_setflags_check(inode, oldflags, flags); + if (err) + goto out_unlock_inode; /* don't silently ignore unsupported ext2 flags */ if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) { diff --git a/fs/inode.c b/fs/inode.c index df6542ec3b88..0ce60b720608 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -2170,3 +2170,20 @@ struct timespec64 current_time(struct inode *inode) return timespec64_trunc(now, inode->i_sb->s_time_gran); } EXPORT_SYMBOL(current_time); + +/* Generic function to check FS_IOC_SETFLAGS values. */ +int vfs_ioc_setflags_check(struct inode *inode, int oldflags, int flags) +{ + /* + * The IMMUTABLE and APPEND_ONLY flags can only be changed by + * the relevant capability. + * + * This test looks nicer. Thanks to Pauline Middelink + */ + if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) && + !capable(CAP_LINUX_IMMUTABLE)) + return -EPERM; + + return 0; +} +EXPORT_SYMBOL(vfs_ioc_setflags_check); diff --git a/fs/jfs/ioctl.c b/fs/jfs/ioctl.c index ba34dae8bd9f..b485c2d7620f 100644 --- a/fs/jfs/ioctl.c +++ b/fs/jfs/ioctl.c @@ -98,24 +98,16 @@ long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) /* Lock against other parallel changes of flags */ inode_lock(inode); - oldflags = jfs_inode->mode2; - - /* - * The IMMUTABLE and APPEND_ONLY flags can only be changed by - * the relevant capability. - */ - if ((oldflags & JFS_IMMUTABLE_FL) || - ((flags ^ oldflags) & - (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) { - if (!capable(CAP_LINUX_IMMUTABLE)) { - inode_unlock(inode); - err = -EPERM; - goto setflags_out; - } + oldflags = jfs_map_ext2(jfs_inode->mode2 & JFS_FL_USER_VISIBLE, + 0); + err = vfs_ioc_setflags_check(inode, oldflags, flags); + if (err) { + inode_unlock(inode); + goto setflags_out; } flags = flags & JFS_FL_USER_MODIFIABLE; - flags |= oldflags & ~JFS_FL_USER_MODIFIABLE; + flags |= jfs_inode->mode2 & ~JFS_FL_USER_MODIFIABLE; jfs_inode->mode2 = flags; jfs_set_inode_flags(inode); diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c index 9b96d79eea6c..0632336d2515 100644 --- a/fs/nilfs2/ioctl.c +++ b/fs/nilfs2/ioctl.c @@ -148,13 +148,8 @@ static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp, oldflags = NILFS_I(inode)->i_flags; - /* - * The IMMUTABLE and APPEND_ONLY flags can only be changed by the - * relevant capability. - */ - ret = -EPERM; - if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) && - !capable(CAP_LINUX_IMMUTABLE)) + ret = vfs_ioc_setflags_check(inode, oldflags, flags); + if (ret) goto out; ret = nilfs_transaction_begin(inode->i_sb, &ti, 0); diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c index 994726ada857..467a2faf0305 100644 --- a/fs/ocfs2/ioctl.c +++ b/fs/ocfs2/ioctl.c @@ -106,16 +106,9 @@ static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags, flags = flags & mask; flags |= oldflags & ~mask; - /* - * The IMMUTABLE and APPEND_ONLY flags can only be changed by - * the relevant capability. - */ - status = -EPERM; - if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) & - (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) { - if (!capable(CAP_LINUX_IMMUTABLE)) - goto bail_unlock; - } + status = vfs_ioc_setflags_check(inode, oldflags, flags); + if (status) + goto bail_unlock; handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); if (IS_ERR(handle)) { diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c index acbbaf7a0bb2..92bcb1ecd994 100644 --- a/fs/reiserfs/ioctl.c +++ b/fs/reiserfs/ioctl.c @@ -74,13 +74,11 @@ long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) err = -EPERM; goto setflags_out; } - if (((flags ^ REISERFS_I(inode)-> - i_attrs) & (REISERFS_IMMUTABLE_FL | - REISERFS_APPEND_FL)) - && !capable(CAP_LINUX_IMMUTABLE)) { - err = -EPERM; + err = vfs_ioc_setflags_check(inode, + REISERFS_I(inode)->i_attrs, + flags); + if (err) goto setflags_out; - } if ((flags & REISERFS_NOTAIL_FL) && S_ISREG(inode->i_mode)) { int result; diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c index 4f1a397fda69..bdea836fc38b 100644 --- a/fs/ubifs/ioctl.c +++ b/fs/ubifs/ioctl.c @@ -107,18 +107,11 @@ static int setflags(struct inode *inode, int flags) if (err) return err; - /* - * The IMMUTABLE and APPEND_ONLY flags can only be changed by - * the relevant capability. - */ mutex_lock(&ui->ui_mutex); oldflags = ubifs2ioctl(ui->flags); - if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { - if (!capable(CAP_LINUX_IMMUTABLE)) { - err = -EPERM; - goto out_unlock; - } - } + err = vfs_ioc_setflags_check(inode, oldflags, flags); + if (err) + goto out_unlock; ui->flags = ioctl2ubifs(flags); ubifs_set_inode_flags(inode); diff --git a/include/linux/fs.h b/include/linux/fs.h index f7fdfe93e25d..1825d055808c 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3546,4 +3546,6 @@ static inline struct sock *io_uring_get_socket(struct file *file) } #endif +int vfs_ioc_setflags_check(struct inode *inode, int oldflags, int flags); + #endif /* _LINUX_FS_H */