io_uring: disallow close of ring itself
A previous commit enabled this functionality, which also enabled O_PATH to work correctly with io_uring. But we can't safely close the ring itself, as the file handle isn't reference counted inside io_uring_enter(). Instead of jumping through hoops to enable ring closure, add a "soft" ->needs_file option, ->needs_file_no_error. This enables O_PATH file descriptors to work, but still catches the case of trying to close the ring itself. Reported-by:Jann Horn <jannh@google.com> Fixes: 904fbcb1 ("io_uring: remove 'fd is io_uring' from close path") Signed-off-by:
Jens Axboe <axboe@kernel.dk>
parent
1ee08de1
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