lkml.org 
[lkml]   [2023]   [Aug]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 09/21] dmaengine: sf-pdma: Annotate struct sf_pdma with __counted_by
    Date
    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 sf_pdma.

    [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

    Cc: Vinod Koul <vkoul@kernel.org>
    Cc: Green Wan <green.wan@sifive.com>
    Cc: dmaengine@vger.kernel.org
    Signed-off-by: Kees Cook <keescook@chromium.org>
    ---
    drivers/dma/sf-pdma/sf-pdma.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/dma/sf-pdma/sf-pdma.h b/drivers/dma/sf-pdma/sf-pdma.h
    index 5c398a83b491..d05772b5d8d3 100644
    --- a/drivers/dma/sf-pdma/sf-pdma.h
    +++ b/drivers/dma/sf-pdma/sf-pdma.h
    @@ -113,7 +113,7 @@ struct sf_pdma {
    void __iomem *membase;
    void __iomem *mappedbase;
    u32 n_chans;
    - struct sf_pdma_chan chans[];
    + struct sf_pdma_chan chans[] __counted_by(n_chans);
    };

    #endif /* _SF_PDMA_H */
    --
    2.34.1
    \
     
     \ /
      Last update: 2023-08-18 02:00    [W:4.213 / U:0.032 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site