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 79BCF4A6CEF for ; Thu, 3 Sep 2026 12:44:17 +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=1788439458; cv=none; b=Ix3f4JWtRb73Nbd8aJ+ePzYZvrKPDtKK5lPi9UKTXLEVfPp0uZZxo2XjHmTuA1pNN+85ADWFVLna+CP7z5fBDSW15KxiY4gQ56ati+Nq+bc3fuEN1c6qXXOR/t4Pidvj7MmrIfqxv2LMGnmdNn0nWx/h+GGSbYFZFYL9UajjPGQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788439458; c=relaxed/simple; bh=b06yZXEaQqSIBMxK4oPujXJDGFQglvMo64Klui6GPSc=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=pG+GSMAPOD4w8WUSv0y05V/DAXYqOQo/ojljWzV2va9lQ+8igtDktcyI6MAs3q3H39DrNsQn4ka0ggRkm/I5jiLpJRFmrl5iUE7YQdklpl9aydYDqwjObWD3vhe8yCZYnQRLugqWDK5ZFZNT7muWbrrQ25kTmSygqlbIALRMXVU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=dmhDrnIN; 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="dmhDrnIN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9C7F31F000E9; Thu, 3 Sep 2026 12:44:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788439457; bh=02NxK4dQWoSxrCpL0ndYHTGBswi7gdyR7YpBEoMDFjc=; h=Subject:To:Cc:From:Date; b=dmhDrnINpjfqGF2P3xjZA/mhVvvSfHmxr1xAlLTu7tOLzSEQho7iDl5WBYsbinZrw BY1kQvwsApHThakSzkJ6iXJIgeewjBqLJZix9AWayBp3XpyAOxGIPKJxD0x534smft A054KnoM+Ehvd6oF+WIKJR22DlW3QJUB7KyT2CaA= Subject: FAILED: patch "[PATCH] KEYS: trusted: Fix TPM teardown ordering" failed to apply to 5.15-stable tree To: nicoyip.dev@gmail.com,jarkko@kernel.org Cc: From: Date: Thu, 03 Sep 2026 12:44:21 +0200 Message-ID: <2026090321-fiction-outthink-69f9@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 5e2d672280d97d83de43031d93761b12dadd7b8a # git commit -s git send-email --to '' --in-reply-to '2026090321-fiction-outthink-69f9@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 5e2d672280d97d83de43031d93761b12dadd7b8a Mon Sep 17 00:00:00 2001 From: Chengfeng Ye Date: Tue, 11 Aug 2026 02:56:03 +0300 Subject: [PATCH] KEYS: trusted: Fix TPM teardown ordering trusted_tpm_exit() drops the TPM chip reference and frees the digest array before unregistering the trusted key type. key_type_lookup() holds key_types_sem for reading until the key operation finishes, while unregister_key_type() takes it for writing. It therefore provides the synchronization point that must precede backend teardown. The current order permits this interleaving: CPU 0 CPU 1 trusted_tpm_exit() key_type_lookup("trusted") put_device(&chip->dev) trusted_tpm_seal() kfree(digests) pcrlock() unregister_key_type() tpm_pcr_extend(..., digests) CPU 1 can consequently dereference the freed digest array. The chip can also be released before callbacks stop using it. KASAN reported: BUG: KASAN: slab-use-after-free in tpm_pcr_extend+0x1f0/0x200 Read of size 2 at addr ffff88810872d000 by task poc/89 Call Trace: tpm_pcr_extend+0x1f0/0x200 pcrlock+0x42/0x70 [trusted] trusted_tpm_seal+0x1b6/0x570 [trusted] trusted_instantiate+0x293/0x340 [trusted] __key_instantiate_and_link+0xb2/0x2b0 __key_create_or_update+0x61e/0xb50 __do_sys_add_key+0x1b8/0x310 Allocated by task 88: __kmalloc_noprof+0x1a7/0x490 do_one_initcall+0xa1/0x390 do_init_module+0x2df/0x840 Freed by task 90: kfree+0x131/0x3c0 trusted_tpm_exit+0x59/0xa0 [trusted] __do_sys_delete_module+0x346/0x510 Move unregister_key_type() before releasing either resource. This stops new lookups and waits for in-flight key operations to finish before the backend state is destroyed. Fixes: 0b6cf6b97b7e ("tpm: pass an array of tpm_extend_digest structures to tpm_pcr_extend()") Cc: stable@vger.kernel.org Signed-off-by: Chengfeng Ye Link: https://lore.kernel.org/r/20260731140925.2973492-1-nicoyip.dev@gmail.com Reviewed-by: Jarkko Sakkinen Tested-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen diff --git a/security/keys/trusted-keys/trusted_tpm1.c b/security/keys/trusted-keys/trusted_tpm1.c index 13513819991e..8f57c6111e7e 100644 --- a/security/keys/trusted-keys/trusted_tpm1.c +++ b/security/keys/trusted-keys/trusted_tpm1.c @@ -987,9 +987,9 @@ static int __init trusted_tpm_init(void) static void trusted_tpm_exit(void) { if (chip) { + unregister_key_type(&key_type_trusted); put_device(&chip->dev); kfree(digests); - unregister_key_type(&key_type_trusted); } }