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 320993081C6; Mon, 13 Oct 2025 15:38:02 +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=1760369882; cv=none; b=tBVQWCUOdCFo0lUT4as2cGXn7/QCzjUNNvUiuinWlDei/8oe90gIZcDBhOzlfhvbJYHS9AdcWQyHKFZqnL985ZGGJlA6VHRvH9VrHVyGewf2iG++RoqaKpepfd6ApVVNCEW8jQK8TfzoHQz4s69Cr9DsGejr6EngAKLwUQSd0oU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760369882; c=relaxed/simple; bh=P/mYqn9kOSaKXHebgvia9EFTJirXYWiFeM0hFZojdhE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=oJ4ubNNfQqDpeXfkCTh9Y1Xzb/b+6zwiH+tHB5yZLvn6CqbvBExf5SNXplB5YhP7WrpwgRjOplc9M0JGJjOxkfPk2LiFCt3QGPOz+ZSEmIfmwobabfmudepNH0EXByPMuZ1+4y9wIXWc4qIMIm2P8sLC1NzvZdW82L0l7IvufdU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=DOS16oND; 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="DOS16oND" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E896C4CEE7; Mon, 13 Oct 2025 15:38:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760369882; bh=P/mYqn9kOSaKXHebgvia9EFTJirXYWiFeM0hFZojdhE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DOS16oNDIPEQ5bPe4aAb5o0w/vvEIagBENkXRboBE0xIbZxVr5BTb3z/w/j7xihvr 2N7gQJAtyqToNy/s1FjQLayKr/SF7X6qiv7OGtdtynuWSdaxyFoZRKsq66BmzuON7G DxQeKUqpVLZrcjlQXQdphn6m8vbQWAjzGk3p3hXM= 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 , =?UTF-8?q?Ren=C3=A9=20Rebe?= , Jonathan 'theJPster' Pallant Subject: [PATCH 6.17 401/563] sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC Date: Mon, 13 Oct 2025 16:44:22 +0200 Message-ID: <20251013144425.811030338@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013144411.274874080@linuxfoundation.org> References: <20251013144411.274874080@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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Michael Karcher [ Upstream commit 4fba1713001195e59cfc001ff1f2837dab877efb ] 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 couple of bad calculations. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged. Fixes: cb736fdbb208 ("sparc64: Convert U1copy_{from,to}_user to accurate exception reporting.") Tested-by: John Paul Adrian Glaubitz # on QEMU 10.0.3 Tested-by: René Rebe # on Ultra 5 UltraSparc IIi Tested-by: Jonathan 'theJPster' Pallant # on Sun Netra T1 Signed-off-by: Michael Karcher Reviewed-by: Andreas Larsson Link: https://lore.kernel.org/r/20250905-memcpy_series-v4-1-1ca72dda195b@mkarcher.dialup.fu-berlin.de Signed-off-by: Andreas Larsson Signed-off-by: Sasha Levin --- arch/sparc/lib/U1memcpy.S | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/arch/sparc/lib/U1memcpy.S b/arch/sparc/lib/U1memcpy.S index 635398ec7540e..154fbd35400ca 100644 --- a/arch/sparc/lib/U1memcpy.S +++ b/arch/sparc/lib/U1memcpy.S @@ -164,17 +164,18 @@ ENTRY(U1_gs_40_fp) retl add %o0, %o2, %o0 ENDPROC(U1_gs_40_fp) -ENTRY(U1_g3_0_fp) - VISExitHalf - retl - add %g3, %o2, %o0 -ENDPROC(U1_g3_0_fp) ENTRY(U1_g3_8_fp) VISExitHalf add %g3, 8, %g3 retl add %g3, %o2, %o0 ENDPROC(U1_g3_8_fp) +ENTRY(U1_g3_16_fp) + VISExitHalf + add %g3, 16, %g3 + retl + add %g3, %o2, %o0 +ENDPROC(U1_g3_16_fp) ENTRY(U1_o2_0_fp) VISExitHalf retl @@ -547,18 +548,18 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */ 62: FINISH_VISCHUNK(o0, f44, f46) 63: UNEVEN_VISCHUNK_LAST(o0, f46, f0) -93: EX_LD_FP(LOAD(ldd, %o1, %f2), U1_g3_0_fp) +93: EX_LD_FP(LOAD(ldd, %o1, %f2), U1_g3_8_fp) add %o1, 8, %o1 subcc %g3, 8, %g3 faligndata %f0, %f2, %f8 - EX_ST_FP(STORE(std, %f8, %o0), U1_g3_8_fp) + EX_ST_FP(STORE(std, %f8, %o0), U1_g3_16_fp) bl,pn %xcc, 95f add %o0, 8, %o0 - EX_LD_FP(LOAD(ldd, %o1, %f0), U1_g3_0_fp) + EX_LD_FP(LOAD(ldd, %o1, %f0), U1_g3_8_fp) add %o1, 8, %o1 subcc %g3, 8, %g3 faligndata %f2, %f0, %f8 - EX_ST_FP(STORE(std, %f8, %o0), U1_g3_8_fp) + EX_ST_FP(STORE(std, %f8, %o0), U1_g3_16_fp) bge,pt %xcc, 93b add %o0, 8, %o0 -- 2.51.0