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R. Silva" In-Reply-To: <20230817235859.49846-2-keescook@chromium.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 187.162.21.192 X-Source-L: No X-Exim-ID: 1qWozG-001AGP-1n X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 187-162-21-192.static.axtel.net ([192.168.15.8]) [187.162.21.192]:47366 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 0 X-Org: HG=hgshared;ORG=hostgator; X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes X-CMAE-Envelope: MS4xfJiZkuZtziY0Ip1kTdrpcXX7McL+3faraS7v1qN+9EYy1M3QDzrR2w/wq3V2chsEOmh50fV1e2F26CT+BGOkJoFBJHgJruu7pDUbeFDS3kGzhkxlQkqF ddDFz+PuzvFcd/a+9a15zHIN4CkWJoWOWu7pq9uwGYFBXzg+xlm7B/CL1g0O1D3pHhhVA0YwkJ0G7Ob3UwxrGwYorp7mAk2JCNfPN+Ij/pu63qbl1DmOIwk/ TrlW+/DSytx++JerKOAFqYSU/8G+hv67MU6vdkVUl/zbM1DgEAIHWpBdDCUUQFtJqe2/6hfd6mfOFJpjnbe75/pN/lF4lGf0fldvhSktsuZNWb2OgIxH5A9s pbSGzk54fp1tTQ7ojHukvEGK/oEB/7/IURodxDzoxs6m3BuySBE= Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org On 8/17/23 17:58, Kees Cook wrote: > Prepare for the coming implementation by GCC and Clang of the __counted_by > attribute. Flexible array members annotated with __counted_by can have > their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS > (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family > functions). > > As found with Coccinelle[1], add __counted_by for struct at_desc. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Vinod Koul > Cc: Ludovic Desroches > Cc: Tudor Ambarus > Cc: linux-arm-kernel@lists.infradead.org > Cc: dmaengine@vger.kernel.org > Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Thanks -- Gustavo > --- > drivers/dma/at_hdmac.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c > index b2876f67471f..b66c7f416881 100644 > --- a/drivers/dma/at_hdmac.c > +++ b/drivers/dma/at_hdmac.c > @@ -239,7 +239,7 @@ struct at_desc { > bool memset_buffer; > dma_addr_t memset_paddr; > int *memset_vaddr; > - struct atdma_sg sg[]; > + struct atdma_sg sg[] __counted_by(sglen); > }; > > /*-- Channels --------------------------------------------------------*/