ARM: 7888/1: seccomp: not compatible with ARM OABI

Make sure that seccomp filter won't be built when ARM OABI is in use,
since there is work needed to distinguish calling conventions. Until
that is done (which is likely never since OABI is deprecated), make
sure seccomp filter is unavailable in the OABI world.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Will Drewry <wad@chromium.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index fa5c600..085b31b 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -24,7 +24,7 @@ config ARM
        select HARDIRQS_SW_RESEND
        select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
        select HAVE_ARCH_KGDB
-       select HAVE_ARCH_SECCOMP_FILTER
+       select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
        select HAVE_ARCH_TRACEHOOK
        select HAVE_BPF_JIT
        select HAVE_CONTEXT_TRACKING
@@ -1726,6 +1726,11 @@ config OABI_COMPAT
          in memory differs between the legacy ABI and the new ARM EABI
          (only for non "thumb" binaries). This option adds a tiny
          overhead to all syscalls and produces a slightly larger kernel.
+
+         The seccomp filter system will not be available when this is
+         selected, since there is no way yet to sensibly distinguish
+         between calling conventions during filtering.
+
          If you know you'll be using only pure EABI user space then you
          can say N here. If this option is not selected and you attempt
          to execute a legacy ABI binary then the result will be