From nobody Sun Feb 8 23:26:54 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 A61863597E; Sun, 4 May 2025 10:19:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746353974; cv=none; b=t7x01Ms8YI0CGhB4qB3Nl4lg1sib4GVk7S5TU/xFdHvOm3TgqSWon6qM0+aQ5cAJ47DcUj83ys6ULIVaOIT00hbaYoMUQa64ZVh0O96Z5op2M8sJX6ErXSuSfCg1lma5uur5adJy+qM1AnT8gS6foKyu6wVfQEEBai/Upb3duws= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746353974; c=relaxed/simple; bh=/zphhyt/wytwwQ3L2MfF1xGmJccBco5+XhvPcJrJ6Bw=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=D2ZAVWy4eRbZoYUZHMD6XhYW5mXID/Ze9o88Zo9qnc8xursqEgctdAM6tGLQ1KLkEigFHQNzD9KrgNXWbaj3zHy1Ix+S/X3+AZCe8bCD4mrPVRgMdkPtkZ++Fz9KNoFGAJV9zYwh7toyfSRGtlIgNwNl77x8NPrgxz92stKAnHY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=G0mu5Qtn; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=WDUKrNAp; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="G0mu5Qtn"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="WDUKrNAp" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1746353970; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=jfl7SNXUW9QYMi5IdJsuAK6+WDbLVdSs2AEZKeOH8eo=; b=G0mu5QtnRB2C2Jr/mXDF6LW+tpTJ5RyHja/nqS6uGtlSLT43QUkBsbkYd7TcQN+G9wFLgr WIK/tu6GTUDjMPizI5qndS8zUro5Mr6xSNpUWlIubE+Dj3Fp0RmulFvuiHkQZsDKsVMLEK l+DX19+gay6Fb9NmQfJwG7GhkRM1U0oDdgF966qgc0tQDJFJHulsSISYmbv+fYlacai0tP LfYnO5BY/8K3DAxdJDgoSsHrpyJ7DySuCFD6Qz7JyoUdGkpPxKElVCJjXWDwiwoiqUqwGZ 3yLheynP3GDV+PQsoHMOA7ja2ndz34GJB0nOSZd76QgTIx0zAsnfA6urcHhluw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1746353970; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=jfl7SNXUW9QYMi5IdJsuAK6+WDbLVdSs2AEZKeOH8eo=; b=WDUKrNApCeBn1j43PZF1WmP+DXkiGtG31xxSQxqtGVor3nXAXAjSjqxTmtewjBjrjS/WC2 g+xugQG1ONBsOBDQ== To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Samuel Holland , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Nam Cao , stable@vger.kernel.org Subject: [PATCH] riscv: Fix kernel crash due to PR_SET_TAGGED_ADDR_CTRL Date: Sun, 4 May 2025 12:19:20 +0200 Message-Id: <20250504101920.3393053-1-namcao@linutronix.de> 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" When userspace does PR_SET_TAGGED_ADDR_CTRL, but Supm extension is not available, the kernel crashes: Oops - illegal instruction [#1] [snip] epc : set_tagged_addr_ctrl+0x112/0x15a ra : set_tagged_addr_ctrl+0x74/0x15a epc : ffffffff80011ace ra : ffffffff80011a30 sp : ffffffc60039be10 [snip] status: 0000000200000120 badaddr: 0000000010a79073 cause: 0000000000000002 set_tagged_addr_ctrl+0x112/0x15a __riscv_sys_prctl+0x352/0x73c do_trap_ecall_u+0x17c/0x20c andle_exception+0x150/0x15c Fix it by checking if Supm is available. Fixes: 09d6775f503b ("riscv: Add support for userspace pointer masking") Signed-off-by: Nam Cao Cc: stable@vger.kernel.org Reviewed-by: Samuel Holland --- arch/riscv/kernel/process.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c index 7c244de77180..3db2c0c07acd 100644 --- a/arch/riscv/kernel/process.c +++ b/arch/riscv/kernel/process.c @@ -275,6 +275,9 @@ long set_tagged_addr_ctrl(struct task_struct *task, uns= igned long arg) unsigned long pmm; u8 pmlen; =20 + if (!riscv_has_extension_unlikely(RISCV_ISA_EXT_SUPM)) + return -EINVAL; + if (is_compat_thread(ti)) return -EINVAL; =20 --=20 2.39.5