[LTP] [PATCH] open|creat: skip S_ISGID check on files created by non-group members
Jan Stancek
jstancek@redhat.com
Mon Jul 30 14:27:00 CEST 2018
----- Original Message -----
> Hi!
> > 0fa3ecd87848 ("Fix up non-directory creation in SGID directories")
> > fixes problem described in CVE-2018-13405. This commit is getting
> > backported to older streams as well.
> >
> > This patch removes S_ISGID check for files created by non-group members
> > in LTP tests creat08 and open10.
>
> Looks good, acked.
Thanks, I almost forgot about this. Pushed.
Regards,
Jan
>
> > Once 0fa3ecd87848 will be in non-rc kernel, we could add a new test
> > for this CVE that would be limited to 4.18+ kernels.
>
> Given that this is CVE we may as well go a little bit further and write
> a test that will fail even on older kernels.
>
> > Signed-off-by: Jan Stancek <jstancek@redhat.com>
> > ---
> > testcases/kernel/syscalls/creat/creat08.c | 13 ++++++-------
> > testcases/kernel/syscalls/open/open10.c | 12 +++++-------
> > 2 files changed, 11 insertions(+), 14 deletions(-)
> >
> > diff --git a/testcases/kernel/syscalls/creat/creat08.c
> > b/testcases/kernel/syscalls/creat/creat08.c
> > index 50f2b39931b8..d22558ac3c53 100644
> > --- a/testcases/kernel/syscalls/creat/creat08.c
> > +++ b/testcases/kernel/syscalls/creat/creat08.c
> > @@ -361,13 +361,12 @@ int main(int ac, char **av)
> > local_flag = FAILED;
> > }
> >
> > - /* Verify modes */
> > - if (!(buf.st_mode & S_ISGID)) {
> > - tst_resm(TFAIL,
> > - "%s: Incorrect modes, setgid bit should be set",
> > - setgid_B);
> > - local_flag = FAILED;
> > - }
> > + /*
> > + * Skip S_ISGID check
> > + * 0fa3ecd87848 ("Fix up non-directory creation in SGID directories")
> > + * clears S_ISGID for files created by non-group members
> > + */
> > +
> > close(fd);
> >
> > if (local_flag == PASSED) {
> > diff --git a/testcases/kernel/syscalls/open/open10.c
> > b/testcases/kernel/syscalls/open/open10.c
> > index 613f2288fbde..14feec9e127e 100644
> > --- a/testcases/kernel/syscalls/open/open10.c
> > +++ b/testcases/kernel/syscalls/open/open10.c
> > @@ -345,13 +345,11 @@ int main(int ac, char *av[])
> > local_flag = FAILED;
> > }
> >
> > - /* Verify modes */
> > - if (!(buf.st_mode & S_ISGID)) {
> > - tst_resm(TFAIL,
> > - "%s: Incorrect modes, setgid bit not set",
> > - setgid_B);
> > - local_flag = FAILED;
> > - }
> > + /*
> > + * Skip S_ISGID check
> > + * 0fa3ecd87848 ("Fix up non-directory creation in SGID directories")
> > + * clears S_ISGID for files created by non-group members
> > + */
> >
> > if (local_flag == PASSED) {
> > tst_resm(TPASS, "Test passed in block2.");
> > --
> > 1.8.3.1
> >
> >
> > --
> > Mailing list info: https://lists.linux.it/listinfo/ltp
>
> --
> Cyril Hrubis
> chrubis@suse.cz
>
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