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 5668F1D0B90; Wed, 2 Oct 2024 14:46:36 +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=1727880396; cv=none; b=Krdn/vCZfN+NjhQ3a1TPk+BcwdYtkWOuHij7Vsf5xvc4A6m1M3aUd6yNhCmiKgG8tuTKN4GKhij0ABJWGtH62c1vySklOCyiGlZ0lMcQUiIzK5X6mkdbDInhcWyssRZkLMr702rS9yeiAnxhTnYJSp41YxXTR1SSPfKjW+sVFfE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727880396; c=relaxed/simple; bh=KFIcw6r9kqcnkDVq9d59t+jQxmIvg46DdgiZR/5+oBc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MXcCVdPA1Y01emwYnc+aXNrCiyWc9wrbkFwCq/uxMikTQkd+kuRAHq0Vnv9uWZOheR+9W5mr68jZ1EjYdPXFFO+DXV9B2JiR+giBf0jQKoVb3OcSIGfxMb2DxvPVdLWCNux/W/7yxTQro892rMqVzhAH8uFlgbI6stlyTJo8BuM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=AWWa/To8; 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="AWWa/To8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA003C4CEC2; Wed, 2 Oct 2024 14:46:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1727880396; bh=KFIcw6r9kqcnkDVq9d59t+jQxmIvg46DdgiZR/5+oBc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AWWa/To8CsmXpArgVmnxfkwi2PxIBJdr7PwUlHEOcSmSt1qmUIxzZaGq5BBOmYjxW QQmmgmUkpY0g38fdU7rpJFz4BE5GdG03JYrNGWQzFef+ahZJydmWD1GAL+2RSpGFP8 sNo6JphQtGxa30iH/v2FUsOQ9Sw0cSoFgkq1ywpI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pavan Kumar Paluri , Tom Lendacky , Herbert Xu Subject: [PATCH 6.6 445/538] crypto: ccp - Properly unregister /dev/sev on sev PLATFORM_STATUS failure Date: Wed, 2 Oct 2024 15:01:24 +0200 Message-ID: <20241002125810.006764221@linuxfoundation.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241002125751.964700919@linuxfoundation.org> References: <20241002125751.964700919@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: Pavan Kumar Paluri commit ce3d2d6b150ba8528f3218ebf0cee2c2c572662d upstream. In case of sev PLATFORM_STATUS failure, sev_get_api_version() fails resulting in sev_data field of psp_master nulled out. This later becomes a problem when unloading the ccp module because the device has not been unregistered (via misc_deregister()) before clearing the sev_data field of psp_master. As a result, on reloading the ccp module, a duplicate device issue is encountered as can be seen from the dmesg log below. on reloading ccp module via modprobe ccp Call Trace: dump_stack_lvl+0xd7/0xf0 dump_stack+0x10/0x20 sysfs_warn_dup+0x5c/0x70 sysfs_create_dir_ns+0xbc/0xd kobject_add_internal+0xb1/0x2f0 kobject_add+0x7a/0xe0 ? srso_alias_return_thunk+0x5/0xfbef5 ? get_device_parent+0xd4/0x1e0 ? __pfx_klist_children_get+0x10/0x10 device_add+0x121/0x870 ? srso_alias_return_thunk+0x5/0xfbef5 device_create_groups_vargs+0xdc/0x100 device_create_with_groups+0x3f/0x60 misc_register+0x13b/0x1c0 sev_dev_init+0x1d4/0x290 [ccp] psp_dev_init+0x136/0x300 [ccp] sp_init+0x6f/0x80 [ccp] sp_pci_probe+0x2a6/0x310 [ccp] ? srso_alias_return_thunk+0x5/0xfbef5 local_pci_probe+0x4b/0xb0 work_for_cpu_fn+0x1a/0x30 process_one_work+0x203/0x600 worker_thread+0x19e/0x350 ? __pfx_worker_thread+0x10/0x10 kthread+0xeb/0x120 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x3c/0x60 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 kobject: kobject_add_internal failed for sev with -EEXIST, don't try to register things with the same name in the same directory. ccp 0000:22:00.1: sev initialization failed ccp 0000:22:00.1: psp initialization failed ccp 0000:a2:00.1: no command queues available ccp 0000:a2:00.1: psp enabled Address this issue by unregistering the /dev/sev before clearing out sev_data in case of PLATFORM_STATUS failure. Fixes: 200664d5237f ("crypto: ccp: Add Secure Encrypted Virtualization (SEV) command support") Cc: stable@vger.kernel.org Signed-off-by: Pavan Kumar Paluri Acked-by: Tom Lendacky Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- drivers/crypto/ccp/sev-dev.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -1367,6 +1367,8 @@ void sev_pci_init(void) return; err: + sev_dev_destroy(psp_master); + psp_master->sev_data = NULL; }