linux-kernel - Re: drivers/pnp/pnpacpi/core.c:253:17: warning: 'strncpy' specified bound 50 equals destination size

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Message-ID: <CAJZ5v0gyGeier-Oz=o59TY1XzuPfZ02K=D6F-bMfJbXJ_5OnBA@mail.gmail.com>
Date:   Mon, 24 Jul 2023 19:15:22 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Sunil V L <sunilvl@...tanamicro.com>
Cc:     kernel test robot <lkp@...el.com>, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: drivers/pnp/pnpacpi/core.c:253:17: warning: 'strncpy' specified
 bound 50 equals destination size

On Mon, Jul 24, 2023 at 4:20 PM Sunil V L <sunilvl@...tanamicro.com> wrote:
>
> +Rafael.
>
> On Mon, Jul 24, 2023 at 07:32:36PM +0800, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   6eaae198076080886b9e7d57f4ae06fa782f90ef
> > commit: a91a9ffbd3a55a0ae1bb75e2b6e85b2a03f64e8f RISC-V: Add support to build the ACPI core
> > date:   8 weeks ago
> > config: riscv-randconfig-r032-20230724 (https://download.01.org/0day-ci/archive/20230724/202307241942.Rff2Nri5-lkp@intel.com/config)
> > compiler: riscv64-linux-gcc (GCC) 12.3.0
> > reproduce: (https://download.01.org/0day-ci/archive/20230724/202307241942.Rff2Nri5-lkp@intel.com/reproduce)
> >
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <lkp@...el.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202307241942.Rff2Nri5-lkp@intel.com/
> >
> > All warnings (new ones prefixed by >>):
> >
> >    drivers/pnp/pnpacpi/core.c: In function 'pnpacpi_add_device.isra':
> > >> drivers/pnp/pnpacpi/core.c:253:17: warning: 'strncpy' specified bound 50 equals destination size [-Wstringop-truncation]
> >      253 |                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
> >          |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> I need some help here to understand what needs to be done. This is a
> common code across architectures. Apart from the fact that ACPI is
> enabled for the first time for RISC-V, I am unable to understand why
> this warning is seen now. Is this because only RISC-V gcc enables this
> warning by default? I don't see this with clang tool chain. If this is
> expected warning, is there a way to suppress?

I think that this is relevant information:

https://stackoverflow.com/questions/50198319/gcc-8-wstringop-truncation-what-is-the-good-practice

Thanks!