Re: [PATCH] block: Replace bio_check_ro()'s WARN_ON()

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To: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: Re: [PATCH] block: Replace bio_check_ro()'s WARN_ON()
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Fri, 22 Nov 2019 11:07:07 -0800
Cc: Jens Axboe <axboe@xxxxxxxxx>, syzbot+21cfe1f803e0e158acf1@xxxxxxxxxxxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <201911221052.0FDE1A1@keescook>
References: <20180824211535.GA22251@beast> <201911221052.0FDE1A1@keescook>
User-agent: Mutt/1.12.1 (2019-06-15)

On Fri, Nov 22, 2019 at 10:53:22AM -0800, Kees Cook wrote:
> Friendly ping! I keep tripping over this. Can this please get applied so
> we can silence syzbot and avoid needless WARNs? :)

What call stack reaches this?  Upper layers should never submit a write
bio on a read-only queue, and we need to fix that in the upper layer.

Follow-Ups:
- Re: [PATCH] block: Replace bio_check_ro()'s WARN_ON()
  - From: Jens Axboe

References:
- [PATCH] block: Replace bio_check_ro()'s WARN_ON()
  - From: Kees Cook
- Re: [PATCH] block: Replace bio_check_ro()'s WARN_ON()
  - From: Kees Cook

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