>From ira.weiny@xxxxxxxxx > Sent: 10 January 2020 19:30 > > Page faults need to ensure the inode mode is correct and consistent with > the vmf information at the time of the fault. There is no easy way to > ensure the vmf information is correct if a mode change is in progress. > Furthermore, there is no good use case to require a mode change while > the file is mmap'ed. > > Track mmap's of the file and fail the mode change if the file is > mmap'ed. This seems wrong to me. I presume the 'mode changes' are from things like 'chmod -w ...'. mmap() should be no different to open(). Only the permissions set when the file is opened count. Next you'll be stopping unlink() when a file is open :-) David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
