linux-kernel - [PATCH 6.0 858/862] io_uring: fix fdinfo sqe offsets calculation

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Message-Id: <20221019083327.799672854@linuxfoundation.org>
Date:   Wed, 19 Oct 2022 10:35:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pavel Begunkov <asml.silence@...il.com>,
        Jens Axboe <axboe@...nel.dk>,
        syzbot+e5198737e8a2d23d958c@...kaller.appspotmail.com
Subject: [PATCH 6.0 858/862] io_uring: fix fdinfo sqe offsets calculation

From: Pavel Begunkov <asml.silence@...il.com>

commit 00927931cb630bbf8edb6d7f4dadb25139fc5e16 upstream.

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@...kaller.appspotmail.com
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Link: https://lore.kernel.org/r/8b41287cb75d5efb8fcb5cccde845ddbbadd8372.1665449983.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 io_uring/fdinfo.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/io_uring/fdinfo.c
+++ b/io_uring/fdinfo.c
@@ -95,7 +95,7 @@ static __cold void __io_uring_show_fdinf
 		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",