From mboxrd@z Thu Jan 1 00:00:00 1970 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 5F70F30BF6A; Mon, 13 Oct 2025 15:03:07 +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=1760367787; cv=none; b=dT2KtqhKVv1fp9eDX5OzQvCiqRap1ONuX46MlWHsWO7ABtB6FgChaxYS3atfWa300fhPBi5fqAzW5D0gKl3bvir+sBX5Gm52zMK9G26099bzeLBpyMauDJ9LJytcj5eIi92qd+XJLft+W4J9sErCeTLW/uyfWAP/oEIwonlW4ZA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760367787; c=relaxed/simple; bh=Bysf+n9wa5oTKKDL+eObHE+LrPKKcnuOCXQGy2rhTIA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oFnq0LdCjbgIwnkAUdIBA0r+NXrU172Knv5NazY73SaXtmQIytK+H5o8UB8ocsMBYAbjItdHAsTGxr97hopR1R5dvO/C0R2wSLF2MIIGc75uvPPPO/7pn/VF1PKT/mPqkvJh+racHgnwhQWrSc7i+lJDzBTR8htKnENkB7lQRwQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=EaQkM3E/; 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="EaQkM3E/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 842FCC116D0; Mon, 13 Oct 2025 15:03:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760367786; bh=Bysf+n9wa5oTKKDL+eObHE+LrPKKcnuOCXQGy2rhTIA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EaQkM3E/tdYlONOgx0tnyfzqrr9JY5rnQfZOiR9aGMDlsSgElA+yEPxCxNq/oVzkf 8xEdxQUBFR8KdsKJcfNZm1dyYVkWOTzo56Ic20RKyfqOy4hCuETCbjEoeh+M4fQnii 3rndNlaNpQxCKlmWEAstKGCaXCHKu1DUrZ2eQNVY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Michael Karcher , Andreas Larsson , Sasha Levin , John Paul Adrian Glaubitz Subject: [PATCH 6.6 132/196] sparc: fix accurate exception reporting in copy_to_user for Niagara 4 Date: Mon, 13 Oct 2025 16:45:23 +0200 Message-ID: <20251013144320.087632801@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013144315.184275491@linuxfoundation.org> References: <20251013144315.184275491@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Michael Karcher [ Upstream commit 5a746c1a2c7980de6c888b6373299f751ad7790b ] The referenced commit introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from the respective function and calculate the remaining bytes left to copy using the current register contents. This commit fixes a bad calculation. This will fix the return value of copy_to_user in a specific faulting case. The behaviour of memcpy stays unchanged. Fixes: 957077048009 ("sparc64: Convert NG4copy_{from,to}_user to accurate exception reporting.") Tested-by: John Paul Adrian Glaubitz # on Oracle SPARC T4-1 Signed-off-by: Michael Karcher Reviewed-by: Andreas Larsson Link: https://lore.kernel.org/r/20250905-memcpy_series-v4-4-1ca72dda195b@mkarcher.dialup.fu-berlin.de Signed-off-by: Andreas Larsson Signed-off-by: Sasha Levin --- arch/sparc/lib/NG4memcpy.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/sparc/lib/NG4memcpy.S b/arch/sparc/lib/NG4memcpy.S index 7ad58ebe0d009..df0ec1bd19489 100644 --- a/arch/sparc/lib/NG4memcpy.S +++ b/arch/sparc/lib/NG4memcpy.S @@ -281,7 +281,7 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */ subcc %o5, 0x20, %o5 EX_ST(STORE(stx, %g1, %o0 + 0x00), memcpy_retl_o2_plus_o5_plus_32) EX_ST(STORE(stx, %g2, %o0 + 0x08), memcpy_retl_o2_plus_o5_plus_24) - EX_ST(STORE(stx, GLOBAL_SPARE, %o0 + 0x10), memcpy_retl_o2_plus_o5_plus_24) + EX_ST(STORE(stx, GLOBAL_SPARE, %o0 + 0x10), memcpy_retl_o2_plus_o5_plus_16) EX_ST(STORE(stx, %o4, %o0 + 0x18), memcpy_retl_o2_plus_o5_plus_8) bne,pt %icc, 1b add %o0, 0x20, %o0 -- 2.51.0