Hi Kent, > On Wed, Mar 26, 2025 at 02:47:49PM +0100, Petr Vorel wrote: > > Hi all, > > [ Cc Kent and other filesystem folks to be sure we don't hide a bug ] > I'm missing context here, and the original thread doesn't seem to be on > lore? I'm sorry, to put more info: this is an attempt to fix of LTP test ioctl_ficlone03.c [1], which is failing on 32 bit compatibility mode: # ./ioctl_ficlone03 tst_test.c:1833: TINFO: === Testing on bcachefs === .. ioctl_ficlone03.c:74: TBROK: ioctl .. failed: ENOTTY (25) ioctl_ficlone03.c:89: TWARN: ioctl .. failed: ENOTTY (25) ioctl_ficlone03.c:91: TWARN: ioctl .. failed: ENOTTY (25) ioctl_ficlone03.c:98: TWARN: close(-1) failed: EBADF (9) Original thread of this is on LTP ML [2]. Kind regards, Petr [1] https://github.com/linux-test-project/ltp/tree/master/testcases/kernel/syscalls/ioctl/ioctl_ficlone03.c [2] https://lore.kernel.org/ltp/20250326-fix_ioctl_ficlone03_32bit_bcachefs-v1-1-554a0315ebf5@xxxxxxxx/ > > > From: Andrea Cervesato <andrea.cervesato@xxxxxxxx> > > > Make sure that capabilities requirements are satisfied when accessing > > > immutable files. On OpenSUSE Tumbleweed 32bit bcachefs fails with the > > > following error due to missing capabilities: > > > tst_test.c:1833: TINFO: === Testing on bcachefs === > > > .. > > > ioctl_ficlone03.c:74: TBROK: ioctl .. failed: ENOTTY (25) > > > ioctl_ficlone03.c:89: TWARN: ioctl .. failed: ENOTTY (25) > > > ioctl_ficlone03.c:91: TWARN: ioctl .. failed: ENOTTY (25) > > > ioctl_ficlone03.c:98: TWARN: close(-1) failed: EBADF (9) > > > Introduce CAP_LINUX_IMMUTABLE capability to make sure that test won't > > > fail on other systems as well. > > > Signed-off-by: Andrea Cervesato <andrea.cervesato@xxxxxxxx> > > > --- > > > testcases/kernel/syscalls/ioctl/ioctl_ficlone03.c | 6 +++++- > > > 1 file changed, 5 insertions(+), 1 deletion(-) > > > diff --git a/testcases/kernel/syscalls/ioctl/ioctl_ficlone03.c b/testcases/kernel/syscalls/ioctl/ioctl_ficlone03.c > > > index 6a9d270d9fb56f3a263f0aed976f62c4576e6a5f..6716423d9c96d9fc1d433f28e0ae1511b912ae2c 100644 > > > --- a/testcases/kernel/syscalls/ioctl/ioctl_ficlone03.c > > > +++ b/testcases/kernel/syscalls/ioctl/ioctl_ficlone03.c > > > @@ -122,5 +122,9 @@ static struct tst_test test = { > > > .bufs = (struct tst_buffers []) { > > > {&clone_range, .size = sizeof(struct file_clone_range)}, > > > {}, > > > - } > > > + }, > > > + .caps = (struct tst_cap []) { > > > + TST_CAP(TST_CAP_REQ, CAP_LINUX_IMMUTABLE), > > > + {} > > > + }, > > Reviewed-by: Petr Vorel <pvorel@xxxxxxx> > > LGTM, obviously it is CAP_LINUX_IMMUTABLE related. > > This looks like fs/bcachefs/fs-ioctl.c > > static int bch2_inode_flags_set(struct btree_trans *trans, > > struct bch_inode_info *inode, > > struct bch_inode_unpacked *bi, > > void *p) > > { > > ... > > if (((newflags ^ oldflags) & (BCH_INODE_append|BCH_INODE_immutable)) && > > !capable(CAP_LINUX_IMMUTABLE)) > > return -EPERM; > > We don't test on vfat and exfat. If I try to do it fail the same way (bcachefs, > > fat, exfat and ocfs2 use custom handler for FAT_IOCTL_SET_ATTRIBUTES). > > I wonder why it does not fail for generic VFS fs/ioctl.c used by Btrfs and XFS: > > /* > > * Generic function to check FS_IOC_FSSETXATTR/FS_IOC_SETFLAGS values and reject > > * any invalid configurations. > > * > > * Note: must be called with inode lock held. > > */ > > static int fileattr_set_prepare(struct inode *inode, > > const struct fileattr *old_ma, > > struct fileattr *fa) > > { > > int err; > > /* > > * The IMMUTABLE and APPEND_ONLY flags can only be changed by > > * the relevant capability. > > */ > > if ((fa->flags ^ old_ma->flags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) && > > !capable(CAP_LINUX_IMMUTABLE)) > > return -EPERM; > > Kind regards, > > Petr > > > }; > > > --- > > > base-commit: 753bd13472d4be44eb70ff183b007fe9c5fffa07 > > > change-id: 20250326-fix_ioctl_ficlone03_32bit_bcachefs-2ec15bd6c0c6 > > > Best regards,
