linux-kernel - Re: [PATCH v13 7/9] open: openat2(2) syscall

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Message-ID: <20190930224159.gp2hqm57qxlm2eat@yavin.dot.cyphar.com>
Date:   Tue, 1 Oct 2019 08:41:59 +1000
From:   Aleksa Sarai <cyphar@...har.com>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, Al Viro <viro@...iv.linux.org.uk>,
        Jeff Layton <jlayton@...nel.org>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-ia64@...r.kernel.org, linux-sh@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Alexei Starovoitov <ast@...nel.org>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        sparclinux@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
        linux-arch@...r.kernel.org, linux-s390@...r.kernel.org,
        Tycho Andersen <tycho@...ho.ws>, Aleksa Sarai <asarai@...e.de>,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>, linuxppc-dev@...ts.ozlabs.org,
        Andy Lutomirski <luto@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Drysdale <drysdale@...gle.com>,
        Christian Brauner <christian@...uner.io>,
        libc-alpha@...rceware.org, linux-parisc@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-api@...r.kernel.org,
        Chanho Min <chanho.min@....com>,
        Oleg Nesterov <oleg@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        linux-alpha@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        containers@...ts.linux-foundation.org
Subject: Re: [PATCH v13 7/9] open: openat2(2) syscall

On 2019-10-01, kbuild test robot <lkp@...el.com> wrote:
> Hi Aleksa,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on linus/master]
> [cannot apply to v5.4-rc1 next-20190930]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

I forgot to include --base to signify this series depends on the
copy_struct_from_user() one. I'll include it in the next version.

> url:    https://github.com/0day-ci/linux/commits/Aleksa-Sarai/namei-openat2-2-path-resolution-restrictions/20191001-025628
> config: i386-defconfig (attached as .config)
> compiler: gcc-7 (Debian 7.4.0-13) 7.4.0
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=i386 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>    fs/open.c: In function '__do_sys_openat2':
> >> fs/open.c:1173:8: error: implicit declaration of function 'copy_struct_from_user'; did you mean 'copy_siginfo_from_user'? [-Werror=implicit-function-declaration]
>      err = copy_struct_from_user(&tmp, sizeof(tmp), how, usize);
>            ^~~~~~~~~~~~~~~~~~~~~
>            copy_siginfo_from_user
>    cc1: some warnings being treated as errors
> 
> vim +1173 fs/open.c
> 
>   1163	
>   1164	SYSCALL_DEFINE4(openat2, int, dfd, const char __user *, filename,
>   1165			const struct open_how __user *, how, size_t, usize)
>   1166	{
>   1167		int err;
>   1168		struct open_how tmp;
>   1169	
>   1170		if (unlikely(usize < OPEN_HOW_SIZE_VER0))
>   1171			return -EINVAL;
>   1172	
> > 1173		err = copy_struct_from_user(&tmp, sizeof(tmp), how, usize);
>   1174		if (err)
>   1175			return err;
>   1176	
>   1177		if (force_o_largefile())
>   1178			tmp.flags |= O_LARGEFILE;
>   1179	
>   1180		return do_sys_open(dfd, filename, &tmp);
>   1181	}
>   1182	
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

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