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 C47DB3430B1; Mon, 5 May 2025 22:40:14 +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=1746484814; cv=none; b=tG4jbPC60ERUETW1pUcdIRgctO8t2+z0Y0QtjbfBXwPhd86Dg+OLxId2tU36T8KJGpGZFKi1SMlcheY8S6Emg96TDCNwMa6MAzL9xhUGAnkCdC5qivn1AY0KpRXiF54P+deOCq062fWFV59zJMM910AN3gqji6WWjVoU2o2XuMs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746484814; c=relaxed/simple; bh=pwIXTziwCHzbUkNjvjKYbolOdJTQBSjZYXQSbpIJteE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=LV+eYG6R50DldVcv+Lyzof80n2MQRASC69P1w4bQAhCdb1UvizlkOjk7LDt7fQyy9c4oyT2LIYYf+ErtAl0Qr1mrbMqhtUSI+qPs8h6sKCQ7cTXnB1nBfvdtHPHicxsM4Nxqkdvs19A0KtnTwXOMMvDjewhtP/XcZ7i4Kz9bR+w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HhqdXUbi; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HhqdXUbi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C76FBC4CEE4; Mon, 5 May 2025 22:40:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746484814; bh=pwIXTziwCHzbUkNjvjKYbolOdJTQBSjZYXQSbpIJteE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HhqdXUbi0WBexC79WaIVeSwAtnQnkNbPxx4t84EQ4vdYThEMSVFhLjmAe81StMUfS lR4+z6zll9ClfQ6OI7JP+SbF59BAjRpWX3aC8nTIkv8PwQ6PwmoBl9z0U8UfccVhYK Z7GppcgQjbaMEvTH8Dlp3fb3dZfsA4NA1wpzZP4wrZJJPp1abDzGiYbgDWElLc9Bqm JD4omvJAyBMseKthoEIXNOKy+fX/z/sWyXRU7HilzE25V37Uoh+RWF6hrQ/MdlZqc7 Q3KeLftTmYTdOi7c8pbqdcMIFdG/QwqahkoJMb+AzpINb+VU57oTSJbWLxWaakdxnu 40/big9tj4tWg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Namjae Jeon , Steve French , Sasha Levin , sfrench@samba.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org Subject: [PATCH AUTOSEL 6.12 026/486] cifs: add validation check for the fields in smb_aces Date: Mon, 5 May 2025 18:31:42 -0400 Message-Id: <20250505223922.2682012-26-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505223922.2682012-1-sashal@kernel.org> References: <20250505223922.2682012-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.12.26 Content-Transfer-Encoding: 8bit From: Namjae Jeon [ Upstream commit eeb827f2922eb07ffbf7d53569cc95b38272646f ] cifs.ko is missing validation check when accessing smb_aces. This patch add validation check for the fields in smb_aces. Signed-off-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/smb/client/cifsacl.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/fs/smb/client/cifsacl.c b/fs/smb/client/cifsacl.c index e36f0e2d7d21e..9a73478e00688 100644 --- a/fs/smb/client/cifsacl.c +++ b/fs/smb/client/cifsacl.c @@ -811,7 +811,23 @@ static void parse_dacl(struct smb_acl *pdacl, char *end_of_acl, return; for (i = 0; i < num_aces; ++i) { + if (end_of_acl - acl_base < acl_size) + break; + ppace[i] = (struct smb_ace *) (acl_base + acl_size); + acl_base = (char *)ppace[i]; + acl_size = offsetof(struct smb_ace, sid) + + offsetof(struct smb_sid, sub_auth); + + if (end_of_acl - acl_base < acl_size || + ppace[i]->sid.num_subauth == 0 || + ppace[i]->sid.num_subauth > SID_MAX_SUB_AUTHORITIES || + (end_of_acl - acl_base < + acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth) || + (le16_to_cpu(ppace[i]->size) < + acl_size + sizeof(__le32) * ppace[i]->sid.num_subauth)) + break; + #ifdef CONFIG_CIFS_DEBUG2 dump_ace(ppace[i], end_of_acl); #endif @@ -855,7 +871,6 @@ static void parse_dacl(struct smb_acl *pdacl, char *end_of_acl, (void *)ppace[i], sizeof(struct smb_ace)); */ - acl_base = (char *)ppace[i]; acl_size = le16_to_cpu(ppace[i]->size); } -- 2.39.5