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authorChristian Brauner <christian@brauner.io>2019-06-21 01:26:35 +0200
committerChristian Brauner <christian@brauner.io>2019-06-21 01:54:53 +0200
commitd68dbb0c9ac8b1ff52eb09aa58ce6358400fa939 (patch)
tree686c484b7aab88806982df098a0cc4fad5121ee9 /kernel/sys_ni.c
parent8f3220a806545442f6f26195bc491520f5276e7c (diff)
arch: handle arches who do not yet define clone3
This cleanly handles arches who do not yet define clone3. clone3() was initially placed under __ARCH_WANT_SYS_CLONE under the assumption that this would cleanly handle all architectures. It does not. Architectures such as nios2 or h8300 simply take the asm-generic syscall definitions and generate their syscall table from it. Since they don't define __ARCH_WANT_SYS_CLONE the build would fail complaining about sys_clone3 missing. The reason this doesn't happen for legacy clone is that nios2 and h8300 provide assembly stubs for sys_clone. This seems to be done for architectural reasons. The build failures for nios2 and h8300 were caught int -next luckily. The solution is to define __ARCH_WANT_SYS_CLONE3 that architectures can add. Additionally, we need a cond_syscall(clone3) for architectures such as nios2 or h8300 that generate their syscall table in the way I explained above. Fixes: 8f3220a80654 ("arch: wire-up clone3() syscall") Signed-off-by: Christian Brauner <christian@brauner.io> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Kees Cook <keescook@chromium.org> Cc: David Howells <dhowells@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Adrian Reber <adrian@lisas.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Florian Weimer <fweimer@redhat.com> Cc: linux-api@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: x86@kernel.org
Diffstat (limited to 'kernel/sys_ni.c')
-rw-r--r--kernel/sys_ni.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 4d9ae5ea6caf..34b76895b81e 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -137,6 +137,8 @@ COND_SYSCALL(capset);
/* kernel/exit.c */
/* kernel/fork.c */
+/* __ARCH_WANT_SYS_CLONE3 */
+COND_SYSCALL(clone3);
/* kernel/futex.c */
COND_SYSCALL(futex);