From: Kees Cook <keescook@chromium.org>
To: Christian Brauner <christian.brauner@ubuntu.com>
Cc: linux-kernel@vger.kernel.org,
Thadeu Lima de Souza Cascardo <cascardo@canonical.com>,
Max Filippov <jcmvbkbc@gmail.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Christian Brauner <christian@brauner.io>,
Andy Lutomirski <luto@amacapital.net>,
Will Drewry <wad@chromium.org>,
linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org,
linux-xtensa@linux-xtensa.org,
linux-arm-kernel@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 14/15] selftests/clone3: Avoid OS-defined clone_args
Date: Fri, 18 Sep 2020 15:00:48 -0700 [thread overview]
Message-ID: <202009181500.9A560349@keescook> (raw)
In-Reply-To: <20200915162528.x7admy45pdqsoke4@wittgenstein>
On Tue, Sep 15, 2020 at 06:25:28PM +0200, Christian Brauner wrote:
> On Sat, Sep 12, 2020 at 04:08:19AM -0700, Kees Cook wrote:
> > As the UAPI headers start to appear in distros, we need to avoid
> > outdated versions of struct clone_args to be able to test modern
> > features. Additionally pull in the syscall numbers correctly.
> >
> > Signed-off-by: Kees Cook <keescook@chromium.org>
> > ---
>
> Hm, with this patch applied I'm getting:
>
> gcc -g -I../../../../usr/include/ clone3_set_tid.c /home/brauner/src/git/linux/linux/tools/testing/selftests/kselftest_harness.h /home/brauner/src/git/linux/linux/tools/testing/selftests/kselftest.h -lcap -o /home/brauner/src/git/linux/linux/tools/testing/selftests/clone3/clone3_set_tid
> In file included from clone3_set_tid.c:24:
> clone3_selftests.h:37:8: error: redefinition of ‘struct clone_args’
> 37 | struct clone_args {
> | ^~~~~~~~~~
> In file included from clone3_set_tid.c:12:
> /usr/include/linux/sched.h:92:8: note: originally defined here
> 92 | struct clone_args {
> | ^~~~~~~~~~
> make: *** [../lib.mk:140: /home/brauner/src/git/linux/linux/tools/testing/selftests/clone3/clone3_set_tid] Error 1
Hm, weird.
> One trick to avoid this could be:
>
> #ifndef CLONE_ARGS_SIZE_VER0
> #define CLONE_ARGS_SIZE_VER0 64 /* sizeof first published struct */
> #endif
>
> #ifndef CLONE_ARGS_SIZE_VER1
> #define CLONE_ARGS_SIZE_VER1 80 /* sizeof second published struct */
> #endif
>
> #ifndef CLONE_ARGS_SIZE_VER2
> #define CLONE_ARGS_SIZE_VER2 88 /* sizeof third published struct */
> #endif
>
> struct __clone_args {
> __aligned_u64 flags;
> __aligned_u64 pidfd;
> __aligned_u64 child_tid;
> __aligned_u64 parent_tid;
> __aligned_u64 exit_signal;
> __aligned_u64 stack;
> __aligned_u64 stack_size;
> __aligned_u64 tls;
> __aligned_u64 set_tid;
> __aligned_u64 set_tid_size;
> __aligned_u64 cgroup;
> };
>
> static pid_t sys_clone3(struct __clone_args *args, size_t size)
> {
> return syscall(__NR_clone3, args, size);
> }
Yeah, that has fewer down sides. I'll rework it.
--
Kees Cook
next prev parent reply other threads:[~2020-09-18 22:00 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-12 11:08 [PATCH 00/15] selftests/seccomp: Refactor change_syscall() Kees Cook
2020-09-12 11:08 ` [PATCH 01/15] selftests/seccomp: Refactor arch register macros to avoid xtensa special case Kees Cook
2020-09-15 15:51 ` Christian Brauner
2020-09-12 11:08 ` [PATCH 02/15] selftests/seccomp: Provide generic syscall setting macro Kees Cook
2020-09-15 15:53 ` Christian Brauner
2020-09-12 11:08 ` [PATCH 03/15] selftests/seccomp: mips: Define SYSCALL_NUM_SET macro Kees Cook
2020-09-15 15:55 ` Christian Brauner
2020-09-18 22:00 ` Kees Cook
2020-09-12 11:08 ` [PATCH 04/15] selftests/seccomp: arm: " Kees Cook
2020-09-15 15:56 ` Christian Brauner
2020-09-12 11:08 ` [PATCH 05/15] selftests/seccomp: arm64: " Kees Cook
2020-09-15 15:58 ` Christian Brauner
2020-09-12 11:08 ` [PATCH 06/15] selftests/seccomp: mips: Remove O32-specific macro Kees Cook
2020-09-15 16:00 ` Christian Brauner
2020-09-12 11:08 ` [PATCH 07/15] selftests/seccomp: Remove syscall setting #ifdefs Kees Cook
2020-09-15 16:01 ` Christian Brauner
2020-09-12 11:08 ` [PATCH 08/15] selftests/seccomp: Convert HAVE_GETREG into ARCH_GETREG/ARCH_SETREG Kees Cook
2020-09-15 16:03 ` Christian Brauner
2020-09-12 11:08 ` [PATCH 09/15] selftests/seccomp: Convert REGSET calls " Kees Cook
2020-09-15 16:05 ` Christian Brauner
2020-09-12 11:08 ` [PATCH 10/15] selftests/seccomp: Avoid redundant register flushes Kees Cook
2020-09-15 16:08 ` Christian Brauner
2020-09-12 11:08 ` [PATCH 11/15] selftests/seccomp: Remove SYSCALL_NUM_RET_SHARE_REG in favor of SYSCALL_RET_SET Kees Cook
2020-09-15 16:11 ` Christian Brauner
2020-09-12 11:08 ` [PATCH 12/15] selftests/seccomp: powerpc: Fix seccomp return value testing Kees Cook
2020-09-14 3:38 ` Michael Ellerman
2020-09-12 11:08 ` [PATCH 13/15] selftests/seccomp: powerpc: Set syscall return during ptrace syscall exit Kees Cook
2020-09-14 5:47 ` Michael Ellerman
2020-09-14 20:20 ` Kees Cook
2020-09-12 11:08 ` [PATCH 14/15] selftests/clone3: Avoid OS-defined clone_args Kees Cook
2020-09-15 16:25 ` Christian Brauner
2020-09-18 22:00 ` Kees Cook [this message]
2020-09-12 11:08 ` [PATCH 15/15] selftests/seccomp: Use __NR_mknodat instead of __NR_mknod Kees Cook
2020-09-15 16:16 ` Christian Brauner
2020-09-14 12:15 ` [PATCH 00/15] selftests/seccomp: Refactor change_syscall() Michael Ellerman
2020-09-14 20:32 ` Kees Cook
2020-09-15 11:12 ` Max Filippov
2020-09-15 12:52 ` Michael Ellerman
2020-09-15 8:45 ` Max Filippov
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