From nobody Mon Jun 8 13:29:54 2026 Received: from mail-pj1-f43.google.com (mail-pj1-f43.google.com [209.85.216.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4EAA018C008 for ; Fri, 29 May 2026 06:55:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.43 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780037719; cv=none; b=oKFCyOBE5LvMNdyAWA/hxUdpqivnkiObgOEe/QXCs0KZAhGVqEy4aaFAN4uIhXrcl5NJSl+dgBw7BgFhrDc4/lfRn49NVjE65tHJ3+AF+UpzxUP+SlC2jmx02e4pFpCmsEJc/8eCDu+PC5vPaP3iPg2hBDMFWQyFAdS/cO0uuLg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780037719; c=relaxed/simple; bh=WVsfc08RDtWVVvHaiVpD2oD6v12cqg/s631vanRKvLc=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=leDakN98vLDAQPJLmdVqwSCjivs6ytGICvf8qDut3vnXYZu6UITR5iwYIlxCQ7i+osMLnEv6QQKN7+Gx3T52pmUC7YmZva28z7vbvU9ADdvmKJLqjsjuGUbbd7tn90L/9iUzPzG/QUa0cGk0OTJzHIA7ee55/3+rAdTNHnpugxM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=auCWz/rv; arc=none smtp.client-ip=209.85.216.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="auCWz/rv" Received: by mail-pj1-f43.google.com with SMTP id 98e67ed59e1d1-36a3e47bba4so916385a91.2 for ; Thu, 28 May 2026 23:55:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1780037718; x=1780642518; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=3Iagb2rUTGDj6eYGk2excnNHam5SMUj25f8dwqAIwig=; b=auCWz/rvLpIKz6CHCS9/m+qV4ILjNxNykIs+SS+0KaViyITWXkun5Pa+UJqhVI9mAL gvyYiHNePeahn6mmhNlyHZdaFx3rzZOlA5yp6aOENxzDbPNkrtU+YeIzbGnEhYEKFq19 8XxjpCtU3Wt9XRzAlVPJNCJxRoyF8v5ojvX1ybcUsbK8Ne7QUARSXS5WM7faTILfv5wu iNDT98VwE+gix0Vmday9B1H8CztIYr5FYGSfzGep+exI79q4UPXkdmT7qbgZiNMn4qtY rGLCRtoN+7Di9XIiksEPsMN3W4vZviKofHoqvJ60BdzYYxDOOZYH4QS3MfKmMxRnnyOG o0Iw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780037718; x=1780642518; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=3Iagb2rUTGDj6eYGk2excnNHam5SMUj25f8dwqAIwig=; b=g7kToQJifmPnJtKdazyJ/S5q3iVXzcPdow/Bh+RGi1WzeCXz+qnAWHrbvDtyME+8eL DKMxbVX+w0HSZes5A6QK0tXZShLHxl9PENPnGLd54Ornn3KPqRXkQYD7TIO3NrmSGJUk qhIIAQJfgoZFpZsPiJEB7nBJXpbdeL1nwQ+Ng8MRjNHhEfcMQqyFj/U/qY2DzxFb7lr2 NU22/1i0HBKao/ZTwJdlgdGbVzDMNhjD801PoBc+cOoDm5Oz4BUJulxSfCGkjflx+H/y vHFwVBq6/KktJ3WNz6WznOe0l6xNJf+38jvid1AfAYsVPmrvF1moYziy0A7MG1GrDrqw eVJw== X-Gm-Message-State: AOJu0YzrOn1D4PZq5WWL8yQuhsL1iQYbDzRxRH9+wxGUJPEU7jOW6vF9 kRNdX9B+S5hbgXdwYvIu6EG+oJOZBkNwNVh+ixKl8B7Dncei1iFDH2k+b9wzAHGp X-Gm-Gg: Acq92OGsWXmq5bDXHXJtAzOiBWtFuEF+cjMytGeqaiHIqBPdDW4qR9z/b0yBwcNrQ4K g5KWrAMChy7RDRHlgJyTQjUFMRTjZKuPqIuCbwo8vuycTZfqY1JrkOLSEX3MT+/a9KpmLpowEyi 5S7NSmuZiXlnaU7qXPMdgRH/5LuxwLgtJnQCr1/wuO96m1X73aeUvAKal2TwYceqhD9UFnH4s0z 7jmIvRpLw2aImdNpRow941Qv3Fl+7iBBJZPbQABDN9YwBEvafn8xorQJIYmNeFsWCuBSlx5iu1S DDjzXqJH/kZ4q5/zznvxTwlDeTjrAFkIQA91G/kf7Y700x3Cd99O7vZ6Qgt0ewD/OYNUI56OQY/ O3rHzn/JDjmyfjBI15W9/62vT8WDHMi2cTe/OYuzpQfgeBBZLf0UMArUME0FFMvhiym088u8NN5 3DqMt+CUBE9InMsT1ehMX59ZxkXZDYx+pi+QP9XKw/o6k= X-Received: by 2002:a17:90b:2701:b0:366:2b56:3ec2 with SMTP id 98e67ed59e1d1-36bbcac2603mr1125096a91.1.1780037717407; Thu, 28 May 2026 23:55:17 -0700 (PDT) Received: from localhost.localdomain ([189.1.242.96]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-36bc6621745sm1121405a91.7.2026.05.28.23.55.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 May 2026 23:55:16 -0700 (PDT) From: Yiqi Sun To: catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, rmk+kernel@armlinux.org.uk, ruanjinjie@huawei.com, will@kernel.org, Yiqi Sun Subject: [PATCH] fix: arm64: syscall: use live x0 for syscall_get_arguments() arg0 Date: Fri, 29 May 2026 14:54:44 +0800 Message-Id: <20260529065444.1336608-1-sunyiqixm@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On arm64, seccomp obtains syscall arguments via syscall_get_arguments(), where arg0 is currently read from regs->orig_x0. However, the syscall wrapper consumes live arguments from regs->regs[0..5]. A ptracer can modify x0 on syscall-enter stop before seccomp runs, but cannot update orig_x0 through that interface. This can leave seccomp checking stale arg0 while the syscall executes with updated live x0, allowing seccomp bypass when filters depend on arg0. Make syscall_get_arguments() read arg0 from regs->regs[0], matching the actual dispatch arguments and removing this desynchronization. Fixes: f27bb139c387 ("arm64: Miscellaneous library functions") Signed-off-by: Yiqi Sun --- arch/arm64/include/asm/syscall.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/sysc= all.h index 5e4c7fc44f73..4bdb4d3ce2b4 100644 --- a/arch/arm64/include/asm/syscall.h +++ b/arch/arm64/include/asm/syscall.h @@ -81,7 +81,7 @@ static inline void syscall_get_arguments(struct task_stru= ct *task, struct pt_regs *regs, unsigned long *args) { - args[0] =3D regs->orig_x0; + args[0] =3D regs->regs[0]; args[1] =3D regs->regs[1]; args[2] =3D regs->regs[2]; args[3] =3D regs->regs[3]; --=20 2.34.1