linux-hardening - Re: [PATCH] nvmet-fc: Remove __counted_by from nvmet_fc_tgt

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Message-ID: <0b2b4a2a-83df-4b79-a295-4da91c841587@kernel.org>
Date: Thu, 30 May 2024 08:41:18 +0200
From: Jiri Slaby <jirislaby@...nel.org>
To: Nathan Chancellor <nathan@...nel.org>,
 James Smart <james.smart@...adcom.com>, Christoph Hellwig <hch@....de>,
 Sagi Grimberg <sagi@...mberg.me>, Chaitanya Kulkarni <kch@...dia.com>
Cc: Kees Cook <keescook@...omium.org>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 Keith Busch <kbusch@...nel.org>, linux-nvme@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
 llvm@...ts.linux.dev, patches@...ts.linux.dev, stable@...r.kernel.org
Subject: Re: [PATCH] nvmet-fc: Remove __counted_by from
 nvmet_fc_tgt_queue.fod[]

On 29. 05. 24, 23:42, Nathan Chancellor wrote:
>    drivers/nvme/target/fc.c:151:2: error: 'counted_by' should not be applied to an array with element of unknown size because 'struct nvmet_fc_fcp_iod' is a struct type with a flexible array member.

The same as for mxser_port:

struct nvmet_fc_fcp_iod {
         struct nvmefc_tgt_fcp_req       *fcpreq;

         struct nvme_fc_cmd_iu           cmdiubuf;
         struct nvme_fc_ersp_iu          rspiubuf;
         dma_addr_t                      rspdma;
         struct scatterlist              *next_sg;
         struct scatterlist              *data_sg;
         int                             data_sg_cnt;
         u32                             offset;
         enum nvmet_fcp_datadir          io_dir;
         bool                            active;
         bool                            abort;
         bool                            aborted;
         bool                            writedataactive;
         spinlock_t                      flock;

         struct nvmet_req                req;
         struct work_struct              defer_work;

         struct nvmet_fc_tgtport         *tgtport;
         struct nvmet_fc_tgt_queue       *queue;

         struct list_head                fcp_list;       /* 
tgtport->fcp_list */
};

The error appears to be invalid.

> This will be an error in a future compiler version [-Werror,-Wbounds-safety-counted-by-elt-type-unknown-size]
>      151 |         struct nvmet_fc_fcp_iod         fod[] __counted_by(sqsize);
>          |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    1 error generated.
-- 
-- 
js
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