[PATCH] install: Fix chown resetting suid/sgid bits from chmod

[Denys Vlasenko]

Applied, thank you.

On Sat, Sep 23, 2023 at 1:57 PM Nero <nero at w1r3.net> wrote:
>
> Since Linux 2.2.13, chown(2) resets the suid/gid bits for all users.
> This patch changes the ordering so that chmod gets called after chown.
>
> This behavior follows GNU coreutils.
>
> Signed-off-by: Nero <nero at w1r3.net>
> ---
>  coreutils/install.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/coreutils/install.c b/coreutils/install.c
> index c0f1c538a..a81a5a1ef 100644
> --- a/coreutils/install.c
> +++ b/coreutils/install.c
> @@ -244,6 +244,14 @@ int install_main(int argc, char **argv)
>                         }
>                 }
>
> +               /* Set the user and group id */
> +               if ((opts & (OPT_OWNER|OPT_GROUP))
> +                && lchown(dest, uid, gid) == -1
> +               ) {
> +                       bb_perror_msg("can't change %s of %s", "ownership", dest);
> +                       ret = EXIT_FAILURE;
> +               }
> +
>                 /* Set the file mode (always, not only with -m).
>                  * GNU coreutils 6.10 is not affected by umask. */
>                 if (chmod(dest, mode) == -1) {
> @@ -254,13 +262,6 @@ int install_main(int argc, char **argv)
>                 if (use_default_selinux_context)
>                         setdefaultfilecon(dest);
>  #endif
> -               /* Set the user and group id */
> -               if ((opts & (OPT_OWNER|OPT_GROUP))
> -                && lchown(dest, uid, gid) == -1
> -               ) {
> -                       bb_perror_msg("can't change %s of %s", "ownership", dest);
> -                       ret = EXIT_FAILURE;
> -               }
>   next:
>                 if (ENABLE_FEATURE_CLEAN_UP && isdir)
>                         free(dest);
> --
> 2.42.0
>
>
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