On 26 April 2014 16:56, Al Viro <v...@zeniv.linux.org.uk> wrote: > On Sat, Apr 26, 2014 at 11:58:45AM +0300, Dmitry Kasatkin wrote: > >> Conflict with Apparmor means with Ubuntu. >> >> But answering to your early question.. >> IMA does not want permission denied when measuring and re-measuring files. >> may_open() is doing that job before. >> >> We need quickly introduce kernel_read without LSM checks... > > *snarl* > > What we need quickly is to introduce you to a textbook or two. As the > matter of fact, in this case even wikipedia might suffice... >
Hopefully we have you who were introduced to a textbook or two about relevant subject and able kindly help us with the solution instead of telling me this crap... > Please, figure out what "mandatory locking" is about, what kind of > exclusion does it provide and how much is it (un)related to LSM. > I admit, I missed this issue, but see above, we have you :) > It has nothing to do with permission being denied; the normal behaviour is > to *block* until the lock has been removed. Or failure with -EAGAIN if > the file had been opened with O_NDELAY. > > The effects apply only to read/write and their ilk; they have nothing > to do with e.g. O_RDWR open(). And having a file already opened r/w > by somebody does not prevent another process from opening it and acquiring > an exclusive lock on some range. -- Thanks, Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/