From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 14C1F358378; Fri, 4 Sep 2026 06:08:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788502115; cv=none; b=fZcgqsGu+2ajR1A0h5y0LvREiALYcNp6WqYxzVV4W0QfawwZiOU9bskX/cKxp0q6TW/EpQ9Kw54GQXBZlgIdlf8yu2uWIgycLsol2jY4TJHw3ApY2HE8yI1DUlpOIGJSlil5QW0pND/GVcDv5hftTPMoUfSETBZvjC2pJsvbnUE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788502115; c=relaxed/simple; bh=XfygIbPK30HvagMInFegeIt8QNEptN5NC+wSMb0pyS8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fjSm52VqGB8dzBiAqL4/eQIQZMvDubD72hHCdfgCYbx+a2L6wZr4Vqdu8IQZ5JpggKtEZYNg9Nt5pob2sy4gGSHj+UmrZlJIdVHVtst46XsOPQYuRuvnORL8N3cxL7jUVj8a4WJMG+sHyEiMyQTqumGGsMOsxC0qFgLxqlqGB8k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wNcZqRrA; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="wNcZqRrA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 70E7C1F00A3D; Fri, 4 Sep 2026 06:08:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788502114; bh=TaiAIVo4IRh6dHtE5Mr2LyUEahV/R0f+mhmoeYu4FY0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=wNcZqRrA9BRsi+o3UGpGj4HcT9YiZjI+lSnTcMTy45jI3iRm4NfgA3BIdjfKQIT+G QStBFnpicqfI2V7bqTLlzQWE10gXIlvYPz2PIFuM8VaNDmG84b9MTfoUlfDUIxi4QO cSvUgkUC4a8qR98VOWFqlg94cpbvve/RCNzUtg9o= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jeff Layton , Chuck Lever Subject: [PATCH 6.12 087/403] nfsd: check client ownership when cancelling a copy-notify stateid Date: Fri, 4 Sep 2026 06:58:10 +0200 Message-ID: <20260904045736.814127938@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260904045734.806166532@linuxfoundation.org> References: <20260904045734.806166532@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jeff Layton commit 6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf upstream. On the OFFLOAD_CANCEL path (clp != NULL), manage_cpntf_state() freed the target cpntf state without checking ownership. The lookup key st->si_opaque.so_id is allocated cyclically (guessable) and the embedded clientid is the fixed per-net nn->s2s_cp_cl_id, so any authenticated NFSv4.2 client could cancel and free another client's copy-notify stateid. Compare the creating clientid recorded in state->cp_p_clid against the requesting client's cl_clientid and return nfserr_bad_stateid on a mismatch instead of freeing the entry. Fixes: ce0887ac96d3 ("NFSD add nfs4 inter ssc to nfsd4_copy") Cc: stable@vger.kernel.org Assisted-by: Claude:claude-opus-4-8 Signed-off-by: Jeff Layton Link: https://patch.msgid.link/20260710-nfsd-testing-v3-5-a0ff7db6aa3e@kernel.org Signed-off-by: Chuck Lever Signed-off-by: Greg Kroah-Hartman --- fs/nfsd/nfs4state.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -7105,10 +7105,20 @@ __be32 manage_cpntf_state(struct nfsd_ne state = NULL; goto unlock; } - if (!clp) + if (!clp) { refcount_inc(&state->cp_stateid.cs_count); - else + } else if (memcmp(&clp->cl_clientid, &state->cp_p_clid, + sizeof(clientid_t))) { + /* + * OFFLOAD_CANCEL: only the creating client may cancel. + * so_id is guessable, so without this check any client + * could free another's cpntf state. + */ + state = NULL; + goto unlock; + } else { _free_cpntf_state_locked(nn, state); + } } unlock: spin_unlock(&nn->s2s_cp_lock);