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 0623F21578F; Thu, 12 Dec 2024 15:46:52 +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=1734018412; cv=none; b=WJbKUl4jdGwvX2h2I7pdkSTvt8XSU9mIx3xcKOznY5Qqr3Ps1oo2ok6PezM0MnpgJ0Cn2XzLhzvDZP4JqX5XF7juqLgjwowgROR9VK2taOrwCHoVHwc0nZnzF4fa5mKzqbE8V1CuThCD9k9o57a6NedJ0XobIP04p5ZoXYm8u8Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734018412; c=relaxed/simple; bh=97jZkKzCW67CJAnKX/zrtj7q3CJKd3P6kEcYyReL9OE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=svvDb8mAtwIOoUMvLc0mJdV4VkAAiCaCL0b2r3FmALdyg/QmXsbbnz7zYMfGTgNJaKkdqAxWQRmFbWjFPyzxcJA03GGaV/FtNDc3cjdsXWsVyzQMuSbJPwOcASVXAA3d02CWvEiAq1qEP9I/LOqglPiyRSmgGo42/Yqq3ElxNQw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=LT8vg91Z; 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="LT8vg91Z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65CF2C4CECE; Thu, 12 Dec 2024 15:46:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1734018411; bh=97jZkKzCW67CJAnKX/zrtj7q3CJKd3P6kEcYyReL9OE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LT8vg91ZPAhHEeZtAeIev+xdDsPJUCedhwPfsA/o14EKWqaI47VdgrO1H2CcuwX46 C2Enc3H0qX0U+H/TlRHOEqL2I0aTnHufT9s62XtK+Ij0ALRweDQcONhe7RJegNhP4n glmS3xwd01PbxlJ2UiDqRK986kgjO35RceGOseng= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kees Cook , "Gustavo A. R. Silva" , Steve French , Sasha Levin Subject: [PATCH 6.6 285/356] smb: client: memcpy() with surrounding object base address Date: Thu, 12 Dec 2024 16:00:04 +0100 Message-ID: <20241212144255.838016576@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241212144244.601729511@linuxfoundation.org> References: <20241212144244.601729511@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org 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: Kees Cook [ Upstream commit f69b0187f8745a7a9584f6b13f5e792594b88b2e ] Like commit f1f047bd7ce0 ("smb: client: Fix -Wstringop-overflow issues"), adjust the memcpy() destination address to be based off the surrounding object rather than based off the 4-byte "Protocol" member. This avoids a build-time warning when compiling under CONFIG_FORTIFY_SOURCE with GCC 15: In function 'fortify_memcpy_chk', inlined from 'CIFSSMBSetPathInfo' at ../fs/smb/client/cifssmb.c:5358:2: ../include/linux/fortify-string.h:571:25: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning] 571 | __write_overflow_field(p_size_field, size); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/smb/client/cifssmb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c index 301189ee1335b..a34db419e46f7 100644 --- a/fs/smb/client/cifssmb.c +++ b/fs/smb/client/cifssmb.c @@ -5364,7 +5364,7 @@ CIFSSMBSetPathInfo(const unsigned int xid, struct cifs_tcon *tcon, param_offset = offsetof(struct smb_com_transaction2_spi_req, InformationLevel) - 4; offset = param_offset + params; - data_offset = (char *) (&pSMB->hdr.Protocol) + offset; + data_offset = (char *)pSMB + offsetof(typeof(*pSMB), hdr.Protocol) + offset; pSMB->ParameterOffset = cpu_to_le16(param_offset); pSMB->DataOffset = cpu_to_le16(offset); pSMB->SetupCount = 1; -- 2.43.0