io_uring: fix fdinfo sqe offsets calculation

Only with the big sqe feature they take 128 bytes per entry, but we
unconditionally advance by 128B. Fix it by using sq_shift.

Fixes: 3b8fdd1dc35e3 ("io_uring/fdinfo: fix sqe dumping for IORING_SETUP_SQE128")
Reported-and-tested-by: syzbot+e5198737e8a2d23d958c@syzkaller.appspotmail.com
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/8b41287cb75d5efb8fcb5cccde845ddbbadd8372.1665449983.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/io_uring/fdinfo.c b/io_uring/fdinfo.c
index 4eae088..2e04850 100644 (file)
--- a/io_uring/fdinfo.c
+++ b/io_uring/fdinfo.c
@@ -94,7 +94,7 @@ static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx,
                sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]);
                if (sq_idx > sq_mask)
                        continue;
-               sqe = &ctx->sq_sqes[sq_idx << 1];
+               sqe = &ctx->sq_sqes[sq_idx << sq_shift];
                seq_printf(m, "%5u: opcode:%s, fd:%d, flags:%x, off:%llu, "
                              "addr:0x%llx, rw_flags:0x%x, buf_index:%d "
                              "user_data:%llu",