io_uring: fix size calculation when registering buf ring
authorWojciech Lukowicz <wlukowicz01@gmail.com>
Sat, 18 Feb 2023 18:41:41 +0000 (18:41 +0000)
committerJens Axboe <axboe@kernel.dk>
Wed, 22 Feb 2023 16:57:23 +0000 (09:57 -0700)
commit48ba08374e779421ca34bd14b4834aae19fc3e6a
tree87ad618cc442a28fd2d044df656a27e9afe35a6c
parent6bf65a1b3668b04bb6c8126494d00303104eb9e5
io_uring: fix size calculation when registering buf ring

Using struct_size() to calculate the size of io_uring_buf_ring will sum
the size of the struct and of the bufs array. However, the struct's fields
are overlaid with the array making the calculated size larger than it
should be.

When registering a ring with N * PAGE_SIZE / sizeof(struct io_uring_buf)
entries, i.e. with fully filled pages, the calculated size will span one
more page than it should and io_uring will try to pin the following page.
Depending on how the application allocated the ring, it might succeed
using an unrelated page or fail returning EFAULT.

The size of the ring should be the product of ring_entries and the size
of io_uring_buf, i.e. the size of the bufs array only.

Fixes: c7fb19428d67 ("io_uring: add support for ring mapped supplied buffers")
Signed-off-by: Wojciech Lukowicz <wlukowicz01@gmail.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://lore.kernel.org/r/20230218184141.70891-1-wlukowicz01@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_uring/kbuf.c