linux-kernel - Re: [PATCH v2 13/15] selftests/nolibc: rename chroot_exe to chroot

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Date:   Fri, 30 Jun 2023 10:45:25 +0200
From:   Thomas Weißschuh <thomas@...ch.de>
To:     Zhangjin Wu <falcon@...ylab.org>
Cc:     w@....eu, arnd@...db.de, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 13/15] selftests/nolibc: rename chroot_exe to
 chroot_tmpfile

On 2023-06-30 08:00:28+0800, Zhangjin Wu wrote:
> For CONFIG_PROC_FS=n, let's use tmpfs and create a tmp file for
> chroot_exe test.
> 
> Since chroot_exe is mainly testing the not directory case (ENOTDIR), so,
> rename it to chroot_tmpfile may be better.
> 
> Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
> ---
>  tools/testing/selftests/nolibc/nolibc-test.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
> index 1002e0267515..2e9eaa7efa6e 100644
> --- a/tools/testing/selftests/nolibc/nolibc-test.c
> +++ b/tools/testing/selftests/nolibc/nolibc-test.c
> @@ -682,6 +682,8 @@ int run_syscall(int min, int max)
>  	int ret = 0;
>  	void *p1, *p2;
>  	int has_gettid = 1;
> +	const char *tmpfile = get_tmpfile("/tmp/dummy");
> +	int has_tmpfile = tmpfile != NULL;
>  
>  	/* <proc> indicates whether or not /proc is mounted */
>  	proc = stat("/proc", &stat_buf) == 0;
> @@ -720,7 +722,7 @@ int run_syscall(int min, int max)
>  		CASE_TEST(chown_self);        EXPECT_SYSER(proc, chown("/proc/self", 0, 0), -1, EPERM); break;
>  		CASE_TEST(chroot_root);       EXPECT_SYSZR(euid0, chroot("/")); break;
>  		CASE_TEST(chroot_blah);       EXPECT_SYSER(1, chroot("/proc/self/blah"), -1, ENOENT); break;
> -		CASE_TEST(chroot_exe);        EXPECT_SYSER(proc, chroot("/proc/self/exe"), -1, ENOTDIR); break;
> +		CASE_TEST(chroot_tmpfile);    EXPECT_SYSER(has_tmpfile, chroot(tmpfile), -1, ENOTDIR); break;

get_tempfile() looks really weird.
Given that the nolibc implementation of chroot() is the most trivial
imaginable in my opinion we can keep the current "chroot_exe" that is
using procfs.

>  		CASE_TEST(close_m1);          EXPECT_SYSER(1, close(-1), -1, EBADF); break;
>  		CASE_TEST(close_dup);         EXPECT_SYSZR(1, close(dup(0))); break;
>  		CASE_TEST(dup_0);             tmp = dup(0);  EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
> -- 
> 2.25.1
>