On Mon, Apr 08, 2019 at 09:20:47AM +0300, Amir Goldstein wrote: > On Sun, Apr 7, 2019 at 11:28 PM Darrick J. Wong <darrick.wong@xxxxxxxxxx> wrote: > > > > From: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > > > > The chattr manpage has this to say about immutable files: > > > > "A file with the 'i' attribute cannot be modified: it cannot be deleted > > or renamed, no link can be created to this file, most of the file's > > metadata can not be modified, and the file can not be opened in write > > mode." > > > > However, we don't actually check the immutable flag in the setattr code, > > which means that we can update project ids and extent size hints on > > supposedly immutable files. Therefore, reject a setattr call on an > > immutable file except for the case where we're trying to unset > > IMMUTABLE. > > > > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> > > Did you miss my comment on v1, or do you not think this use case > is going to hurt any application that is not a rootkit? > > chattr +i foo => OK > chattr +i foo => -EPERM Nah, I plain forgot to update the patch. :( Will send v2 where you're allowed to +i multiple times so long as that's the only thing you're changing. --D > Thanks, > Amir.
