From nobody Fri Apr 3 08:34:57 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 179B736074D; Tue, 24 Mar 2026 16:31:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774369884; cv=none; b=YAorzG9yg3QXN8MEd6AVRYkHKHaXjbreE2NVrT1zN2YOEMaYSuQqNkPYUeFcI+kt3VfmpxVkOGBlmU2H+g7VVWRrUdLL+Grl+/NYFGUA9ds3Q+y2IzHLT13SS4LTZL0Y3ARL8Z+d3Yb4OChwuvrFOd3GuKwezfWpbgeGLEIUgag= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774369884; c=relaxed/simple; bh=yn2nBBvGUP4VCIrQE/ORrl6ivc1Oe5X0ZlBpwgBoEKI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=pJ0Z2yBakdzJneEiqLmKwgcqTKOp39nl0HGhTm8dwjX0chvMp45n4XyxUOJIITqJ+D2Ucb0IguLmi4iKPxYMIp5qZuodaptUoyNJTTq9GcoUW7PJ7568iRItjbeGvwqq902Pt+5ySJc7NzkyjWVAmNtIcCPhx0XZ5XpK4tZgN74= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0Q0kFNSK; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="0Q0kFNSK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0A9A5C19424; Tue, 24 Mar 2026 16:31:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1774369883; bh=yn2nBBvGUP4VCIrQE/ORrl6ivc1Oe5X0ZlBpwgBoEKI=; h=From:To:Cc:Subject:Date:From; b=0Q0kFNSK9lmw9I10KjVLh2z4djgLDbUNH0K4NLkwD+1hmCEFwFJ4Ziu8VqEsJJ0x2 msfS6GguqPAkyeqFOXib+4OESMr3dqs0uqGkZ66i/EA/+8NcrJvXDm02HT8jD2QI82 hqgBL4YxZhD9rqSTbefXtZm59OQTq1qPxFjr4SPM= From: Greg Kroah-Hartman To: loongarch@lists.linux.dev Cc: arnd@arndb.de, jiaxun.yang@flygoat.com, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Huacai Chen , WANG Xuerui , stable Subject: [PATCH] LoongArch: add spectre boundry for syscall dispatch table Date: Tue, 24 Mar 2026 17:30:57 +0100 Message-ID: <2026032456-crinkle-washable-96ea@gregkh> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1500; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=yn2nBBvGUP4VCIrQE/ORrl6ivc1Oe5X0ZlBpwgBoEKI=; b=owGbwMvMwCRo6H6F97bub03G02pJDJmH9jjqL7bRfc/qKdh12qDtScC9uWc2b1LTLxWsvvhBa 434DUWTjlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZiI2UOGmYyJfa8iDRf8874/ 98+Cz18+zec+5cQwP3rb65+vVZ+t873+Qdlmgtq71UUT/gAA X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The LoongArch syscall number is directly controlled by userspace, but does not have a array_index_nospec() boundry to prevent access past the syscall function pointer tables. Cc: Huacai Chen Cc: WANG Xuerui Assisted-by: gkh_clanker_2000 Cc: stable Signed-off-by: Greg Kroah-Hartman --- My scripts caught this as I think LoongArch is vulnerable to the old-style Spectre 1 issues, but I couldn't find where it was addressed in the syscall path. Did I just miss it somewhere, or is this patch still needed? arch/loongarch/kernel/syscall.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/loongarch/kernel/syscall.c b/arch/loongarch/kernel/syscal= l.c index 1249d82c1cd0..f2c98bbafce3 100644 --- a/arch/loongarch/kernel/syscall.c +++ b/arch/loongarch/kernel/syscall.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -74,6 +75,7 @@ void noinstr __no_stack_protector do_syscall(struct pt_re= gs *regs) add_random_kstack_offset(); =20 if (nr < NR_syscalls) { + nr =3D array_index_nospec(nr, NR_syscalls); syscall_fn =3D sys_call_table[nr]; regs->regs[4] =3D syscall_fn(regs->orig_a0, regs->regs[5], regs->regs[6], regs->regs[7], regs->regs[8], regs->regs[9]); --=20 2.53.0