From nobody Sat Feb 7 15:30:17 2026 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (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 643E2350D47; Sun, 1 Feb 2026 14:00:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769954417; cv=none; b=BKZmNUGm/pxa8g+sqb7o4+q9ITOvr0QOnZ1XrwtQ3P0HhxTJn4oK7/N4wQ5pvYhrD8VtiXdGBu/5FGfuC58eb3Ofo14gj2AKf1sSsmdnt3QBytoBcf9/In1Jrcv/DmLDrnBJdeJjmYYhuQlBVhLVl4NFngS7Dx2nL6OU3WBpKrc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769954417; c=relaxed/simple; bh=8Dn39dG5RGaSA53R1R+/K38BciWvPiVBuve0XCmCN2M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GNhIgRAmQGaxXSOP9rtG9NBLVEULaatSpxj0aIt+bxQCeLP+b541a1KscDmLA7hRVh74o7TB5vlEYi5kUVKTQMUNppN5kLH0ZVGd9eHVispGgQJ37hVDarycU/txlTiOigwKZ0bOVECQ3AhEtoCOpalZksk5mGYLhkgvmSgEBR4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=tQfu8y7+; arc=none smtp.client-ip=148.163.156.1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="tQfu8y7+" Received: from pps.filterd (m0356517.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 611Cci4D019443; Sun, 1 Feb 2026 13:59:56 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=tQGrz+P5gwETbvhiO C/Xn6iVyhUnynE3XJHnX9wVo0w=; b=tQfu8y7+e19aBa17rHoXydNu9z8vRJgLp uWNo0Z3MCDOBu7qHo6auMa0HiBYMMAjvcySA2NtU9Izh51PRSWM4xdK+VkypAYOk Kpw4RVCeWz8EF/HwrvuoqA04mVMSEHZnSWcb9Wjuv+Pen4HczdIrPKJMsAVUL7IM +6pa0SNKJ7sWuzcKEpLUn4Mh5n8tse0TuFPcewlG8Mw+guuckH+QSjjymYoC29vZ WLphhzVzqD6fisgonK49Tabod56PlMUJbHVQWmkAfgceBEFrbJdCvuJZJ/+dEaBi +uUmikxN2eSAQ8Xk7q64VvkpDhpMPPqedREWMNJwDQg7vhvuFAnNg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4c19f64jxy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 01 Feb 2026 13:59:55 +0000 (GMT) Received: from m0356517.ppops.net (m0356517.ppops.net [127.0.0.1]) by pps.reinject (8.18.1.12/8.18.0.8) with ESMTP id 611DxtoK027557; Sun, 1 Feb 2026 13:59:55 GMT Received: from ppma21.wdc07v.mail.ibm.com (5b.69.3da9.ip4.static.sl-reverse.com [169.61.105.91]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4c19f64jxw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 01 Feb 2026 13:59:55 +0000 (GMT) Received: from pps.filterd (ppma21.wdc07v.mail.ibm.com [127.0.0.1]) by ppma21.wdc07v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 6118NDxf025743; Sun, 1 Feb 2026 13:59:54 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma21.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4c1w2mhkq3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 01 Feb 2026 13:59:53 +0000 Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 611Dxnem6357426 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 1 Feb 2026 13:59:49 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9C6F420043; Sun, 1 Feb 2026 13:59:49 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3C94120040; Sun, 1 Feb 2026 13:59:46 +0000 (GMT) Received: from li-fc74f8cc-3279-11b2-a85c-ef5828687581.ibm.com.com (unknown [9.39.20.39]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Sun, 1 Feb 2026 13:59:46 +0000 (GMT) From: Srish Srinivasan To: linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, James.Bottomley@HansenPartnership.com, jarkko@kernel.org, zohar@linux.ibm.com, nayna@linux.ibm.com, rnsastry@linux.ibm.com, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, ssrish@linux.ibm.com Subject: [PATCH v6 4/6] pseries/plpks: add HCALLs for PowerVM Key Wrapping Module Date: Sun, 1 Feb 2026 19:29:28 +0530 Message-ID: <20260201135930.898721-5-ssrish@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260201135930.898721-1-ssrish@linux.ibm.com> References: <20260201135930.898721-1-ssrish@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: GeT0u4yS1_8H08HogLXWgM8P6UrUfoAK X-Authority-Analysis: v=2.4 cv=drTWylg4 c=1 sm=1 tr=0 ts=697f5c5c cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=nO4dFLMeAchwtJrxA4IA:9 a=POYjf8jjcDEwoKyR:21 X-Proofpoint-ORIG-GUID: dKSTxlzTq9mnF3jh5v48aGJtI-VnNoFB X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjAxMDEyMCBTYWx0ZWRfX1UhNeq2NToX2 dl+nlMp49/w0DHHnh6KP1+AsfaaoRvxcGDzWPFWXwE/s9iZmK+Fz/LTNlXb7QqH5fd3lrRAU6kT Q5GwNGLQmKTq+RDXtX82XPivFUC09GCATZ7miOIpCjpAPKJv7sr06uP3eOsUgFM5yn8CwM1GT3b 1S4qi2Ix/owv0i15GP+g+wboSmnOVESvm+A7Tzm1cp52Plx3RO4yO6qT2d3/g1Q0s2x8yKsBHgb ob6w3qGmnI012zUWmWCDSKXgzGKipoC18H7ToE/JYX+1V9uWWN/dzPgqFVyepNxhBFosSX3eMby kGcNz5z5ZGgNLScKBAK/QipL/2cVxxkxv+5rc5stavBUUIOdi/OOwy3cs8OU7EUytcIOnzfg+OV lOvbQqRU9QO27rBQ784TGCuZAI/cnaQRcz9G+Hm1FnWa2JDKWmrLr2BtAIWIOgfj1jAuL4xRbXA dRglXJDs5N52mF1QVEA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-01_05,2026-01-30_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 spamscore=0 malwarescore=0 bulkscore=0 phishscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2602010120 Content-Type: text/plain; charset="utf-8" The hypervisor generated wrapping key is an AES-GCM-256 symmetric key which is stored in a non-volatile, secure, and encrypted storage called the Power LPAR Platform KeyStore. It has policy based protections that prevent it from being read out or exposed to the user. Implement H_PKS_GEN_KEY, H_PKS_WRAP_OBJECT, and H_PKS_UNWRAP_OBJECT HCALLs to enable using the PowerVM Key Wrapping Module (PKWM) as a new trust source for trusted keys. Disallow H_PKS_READ_OBJECT, H_PKS_SIGNED_UPDATE, and H_PKS_WRITE_OBJECT for objects with the 'wrapping key' policy set. Capture the availability status for the H_PKS_WRAP_OBJECT interface. Signed-off-by: Srish Srinivasan Reviewed-by: Nayna Jain Tested-by: Nayna Jain --- Documentation/arch/powerpc/papr_hcalls.rst | 43 +++ arch/powerpc/include/asm/plpks.h | 10 + arch/powerpc/platforms/pseries/plpks.c | 344 ++++++++++++++++++++- 3 files changed, 395 insertions(+), 2 deletions(-) diff --git a/Documentation/arch/powerpc/papr_hcalls.rst b/Documentation/arc= h/powerpc/papr_hcalls.rst index 805e1cb9bab9..14e39f095a1c 100644 --- a/Documentation/arch/powerpc/papr_hcalls.rst +++ b/Documentation/arch/powerpc/papr_hcalls.rst @@ -300,6 +300,49 @@ H_HTM supports setup, configuration, control and dumpi= ng of Hardware Trace Macro (HTM) function and its data. HTM buffer stores tracing data for func= tions like core instruction, core LLAT and nest. =20 +**H_PKS_GEN_KEY** + +| Input: authorization, objectlabel, objectlabellen, policy, out, outlen +| Out: *Hypervisor Generated Key, or None when the wrapping key policy is = set* +| Return Value: *H_SUCCESS, H_Function, H_State, H_R_State, H_Parameter, H= _P2, + H_P3, H_P4, H_P5, H_P6, H_Authority, H_Nomem, H_Busy, H_Re= source, + H_Aborted* + +H_PKS_GEN_KEY is used to have the hypervisor generate a new random key. +This key is stored as an object in the Power LPAR Platform KeyStore with +the provided object label. With the wrapping key policy set the key is only +visible to the hypervisor, while the key's label would still be visible to +the user. Generation of wrapping keys is supported only for a key size of +32 bytes. + +**H_PKS_WRAP_OBJECT** + +| Input: authorization, wrapkeylabel, wrapkeylabellen, objectwrapflags, in, +| inlen, out, outlen, continue-token +| Out: *continue-token, byte size of wrapped object, wrapped object* +| Return Value: *H_SUCCESS, H_Function, H_State, H_R_State, H_Parameter, H= _P2, + H_P3, H_P4, H_P5, H_P6, H_P7, H_P8, H_P9, H_Authority, H_I= nvalid_Key, + H_NOT_FOUND, H_Busy, H_LongBusy, H_Aborted* + +H_PKS_WRAP_OBJECT is used to wrap an object using a wrapping key stored in= the +Power LPAR Platform KeyStore and return the wrapped object to the caller. = The +caller provides a label to a wrapping key with the 'wrapping key' policy s= et, +which must have been previously created with H_PKS_GEN_KEY. The provided o= bject +is then encrypted with the wrapping key and additional metadata and the re= sult +is returned to the caller. + + +**H_PKS_UNWRAP_OBJECT** + +| Input: authorization, objectwrapflags, in, inlen, out, outlen, continue-= token +| Out: *continue-token, byte size of unwrapped object, unwrapped object* +| Return Value: *H_SUCCESS, H_Function, H_State, H_R_State, H_Parameter, H= _P2, + H_P3, H_P4, H_P5, H_P6, H_P7, H_Authority, H_Unsupported, = H_Bad_Data, + H_NOT_FOUND, H_Invalid_Key, H_Busy, H_LongBusy, H_Aborted* + +H_PKS_UNWRAP_OBJECT is used to unwrap an object that was previously warapp= ed with +H_PKS_WRAP_OBJECT. + References =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D .. [1] "Power Architecture Platform Reference" diff --git a/arch/powerpc/include/asm/plpks.h b/arch/powerpc/include/asm/pl= pks.h index 8f034588fdf7..e87f90e40d4e 100644 --- a/arch/powerpc/include/asm/plpks.h +++ b/arch/powerpc/include/asm/plpks.h @@ -113,6 +113,16 @@ void plpks_early_init_devtree(void); int plpks_populate_fdt(void *fdt); =20 int plpks_config_create_softlink(struct kobject *from); + +bool plpks_wrapping_is_supported(void); + +int plpks_gen_wrapping_key(void); + +int plpks_wrap_object(u8 **input_buf, u32 input_len, u16 wrap_flags, + u8 **output_buf, u32 *output_len); + +int plpks_unwrap_object(u8 **input_buf, u32 input_len, + u8 **output_buf, u32 *output_len); #else // CONFIG_PSERIES_PLPKS static inline bool plpks_is_available(void) { return false; } static inline u16 plpks_get_passwordlen(void) { BUILD_BUG(); } diff --git a/arch/powerpc/platforms/pseries/plpks.c b/arch/powerpc/platform= s/pseries/plpks.c index 4a08f51537c8..23e4e2a922fc 100644 --- a/arch/powerpc/platforms/pseries/plpks.c +++ b/arch/powerpc/platforms/pseries/plpks.c @@ -9,6 +9,32 @@ =20 #define pr_fmt(fmt) "plpks: " fmt =20 +#define PLPKS_WRAPKEY_COMPONENT "PLPKSWR" +#define PLPKS_WRAPKEY_NAME "default-wrapping-key" + +/* + * To 4K align the {input, output} buffers to the {UN}WRAP H_CALLs + */ +#define PLPKS_WRAPPING_BUF_ALIGN 4096 + +/* + * To ensure the output buffer's length is at least 1024 bytes greater + * than the input buffer's length during the WRAP H_CALL + */ +#define PLPKS_WRAPPING_BUF_DIFF 1024 + +#define PLPKS_WRAP_INTERFACE_BIT 3 +#define PLPKS_WRAPPING_KEY_LENGTH 32 + +#define WRAPFLAG_BE_BIT_SET(be_bit) \ + BIT_ULL(63 - (be_bit)) + +#define WRAPFLAG_BE_GENMASK(be_bit_hi, be_bit_lo) \ + GENMASK_ULL(63 - (be_bit_hi), 63 - (be_bit_lo)) + +#define WRAPFLAG_BE_FIELD_PREP(be_bit_hi, be_bit_lo, val) \ + FIELD_PREP(WRAPFLAG_BE_GENMASK(be_bit_hi, be_bit_lo), (val)) + #include #include #include @@ -19,6 +45,7 @@ #include #include #include +#include #include #include #include @@ -39,6 +66,7 @@ static u32 supportedpolicies; static u32 maxlargeobjectsize; static u64 signedupdatealgorithms; static u64 wrappingfeatures; +static bool wrapsupport; =20 struct plpks_auth { u8 version; @@ -283,6 +311,7 @@ static int _plpks_get_config(void) maxlargeobjectsize =3D be32_to_cpu(config->maxlargeobjectsize); signedupdatealgorithms =3D be64_to_cpu(config->signedupdatealgorithms); wrappingfeatures =3D be64_to_cpu(config->wrappingfeatures); + wrapsupport =3D config->flags & PPC_BIT8(PLPKS_WRAP_INTERFACE_BIT); =20 // Validate that the numbers we get back match the requirements of the sp= ec if (maxpwsize < 32) { @@ -614,6 +643,9 @@ int plpks_signed_update_var(struct plpks_var *var, u64 = flags) if (!(var->policy & PLPKS_SIGNEDUPDATE)) return -EINVAL; =20 + if (var->policy & PLPKS_WRAPPINGKEY) + return -EINVAL; + // Signed updates need the component to be NULL. if (var->component) return -EINVAL; @@ -696,6 +728,9 @@ int plpks_write_var(struct plpks_var var) if (var.policy & PLPKS_SIGNEDUPDATE) return -EINVAL; =20 + if (var.policy & PLPKS_WRAPPINGKEY) + return -EINVAL; + auth =3D construct_auth(PLPKS_OS_OWNER); if (IS_ERR(auth)) return PTR_ERR(auth); @@ -790,6 +825,9 @@ static int plpks_read_var(u8 consumer, struct plpks_var= *var) if (var->namelen > PLPKS_MAX_NAME_SIZE) return -EINVAL; =20 + if (var->policy & PLPKS_WRAPPINGKEY) + return -EINVAL; + auth =3D construct_auth(consumer); if (IS_ERR(auth)) return PTR_ERR(auth); @@ -845,8 +883,310 @@ static int plpks_read_var(u8 consumer, struct plpks_v= ar *var) } =20 /** - * plpks_read_os_var() - Fetch the data for the specified variable that is - * owned by the OS consumer. + * plpks_wrapping_is_supported() - Get the H_PKS_WRAP_OBJECT interface + * availability status for the LPAR. + * + * Successful execution of the H_PKS_GET_CONFIG HCALL during initialization + * sets bit 3 of the flags variable in the PLPKS config structure if the + * H_PKS_WRAP_OBJECT interface is supported. + * + * Returns: true if the H_PKS_WRAP_OBJECT interface is supported, false if= not. + */ +bool plpks_wrapping_is_supported(void) +{ + return wrapsupport; +} +EXPORT_SYMBOL_GPL(plpks_wrapping_is_supported); + +/** + * plpks_gen_wrapping_key() - Generate a new random key with the 'wrapping= key' + * policy set. + * + * The H_PKS_GEN_KEY HCALL makes the hypervisor generate a new random key = and + * store the key in a PLPKS object with the provided object label. With the + * 'wrapping key' policy set, only the label to the newly generated random= key + * would be visible to the user. + * + * Possible reasons for the returned errno values: + * + * -ENXIO if PLPKS is not supported + * -EIO if PLPKS access is blocked due to the LPAR's state + * if PLPKS modification is blocked due to the LPAR's state + * if an error occurred while processing the request + * -EINVAL if invalid authorization parameter + * if invalid object label parameter + * if invalid object label len parameter + * if invalid or unsupported policy declaration + * if invalid output buffer parameter + * if invalid output buffer length parameter + * -EPERM if access is denied + * -ENOMEM if there is inadequate memory to perform this operation + * -EBUSY if unable to handle the request + * -EEXIST if the object label already exists + * + * Returns: On success 0 is returned, a negative errno if not. + */ +int plpks_gen_wrapping_key(void) +{ + unsigned long retbuf[PLPAR_HCALL_BUFSIZE] =3D { 0 }; + struct plpks_auth *auth; + struct label *label; + int rc =3D 0, pseries_status =3D 0; + struct plpks_var var =3D { + .name =3D PLPKS_WRAPKEY_NAME, + .namelen =3D strlen(var.name), + .policy =3D PLPKS_WRAPPINGKEY, + .os =3D PLPKS_VAR_LINUX, + .component =3D PLPKS_WRAPKEY_COMPONENT + }; + + auth =3D construct_auth(PLPKS_OS_OWNER); + if (IS_ERR(auth)) + return PTR_ERR(auth); + + label =3D construct_label(var.component, var.os, var.name, var.namelen); + if (IS_ERR(label)) { + rc =3D PTR_ERR(label); + goto out; + } + + rc =3D plpar_hcall(H_PKS_GEN_KEY, retbuf, + virt_to_phys(auth), virt_to_phys(label), + label->size, var.policy, + NULL, PLPKS_WRAPPING_KEY_LENGTH); + + if (!rc) + rc =3D plpks_confirm_object_flushed(label, auth); + + pseries_status =3D rc; + rc =3D pseries_status_to_err(rc); + + if (rc && rc !=3D -EEXIST) { + pr_err("H_PKS_GEN_KEY failed. pseries_status=3D%d, rc=3D%d", + pseries_status, rc); + } else { + rc =3D 0; + } + + kfree(label); +out: + kfree(auth); + return rc; +} +EXPORT_SYMBOL_GPL(plpks_gen_wrapping_key); + +/** + * plpks_wrap_object() - Wrap an object using the default wrapping key sto= red in + * the PLPKS. + * @input_buf: buffer containing the data to be wrapped + * @input_len: length of the input buffer + * @wrap_flags: object wrapping flags + * @output_buf: buffer to store the wrapped data + * @output_len: length of the output buffer + * + * The H_PKS_WRAP_OBJECT HCALL wraps an object using a wrapping key stored= in + * the PLPKS and returns the wrapped object to the caller. The caller prov= ides a + * label to the wrapping key with the 'wrapping key' policy set that must = have + * been previously created with the H_PKS_GEN_KEY HCALL. The provided obje= ct is + * then encrypted with the wrapping key and additional metadata and the re= sult + * is returned to the user. The metadata includes the wrapping algorithm a= nd the + * wrapping key name so those parameters are not required during unwrap. + * + * Possible reasons for the returned errno values: + * + * -ENXIO if PLPKS is not supported + * -EIO if PLPKS access is blocked due to the LPAR's state + * if PLPKS modification is blocked due to the LPAR's state + * if an error occurred while processing the request + * -EINVAL if invalid authorization parameter + * if invalid wrapping key label parameter + * if invalid wrapping key label length parameter + * if invalid or unsupported object wrapping flags + * if invalid input buffer parameter + * if invalid input buffer length parameter + * if invalid output buffer parameter + * if invalid output buffer length parameter + * if invalid continue token parameter + * if the wrapping key is not compatible with the wrapping + * algorithm + * -EPERM if access is denied + * -ENOENT if the requested wrapping key was not found + * -EBUSY if unable to handle the request or long running operation + * initiated, retry later. + * + * Returns: On success 0 is returned, a negative errno if not. + */ +int plpks_wrap_object(u8 **input_buf, u32 input_len, u16 wrap_flags, + u8 **output_buf, u32 *output_len) +{ + unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] =3D { 0 }; + struct plpks_auth *auth; + struct label *label; + u64 continuetoken =3D 0; + u64 objwrapflags =3D 0; + int rc =3D 0, pseries_status =3D 0; + bool sb_audit_or_enforce_bit =3D wrap_flags & BIT(0); + bool sb_enforce_bit =3D wrap_flags & BIT(1); + struct plpks_var var =3D { + .name =3D PLPKS_WRAPKEY_NAME, + .namelen =3D strlen(var.name), + .os =3D PLPKS_VAR_LINUX, + .component =3D PLPKS_WRAPKEY_COMPONENT + }; + + auth =3D construct_auth(PLPKS_OS_OWNER); + if (IS_ERR(auth)) + return PTR_ERR(auth); + + label =3D construct_label(var.component, var.os, var.name, var.namelen); + if (IS_ERR(label)) { + rc =3D PTR_ERR(label); + goto out; + } + + /* Set the consumer password requirement bit. A must have. */ + objwrapflags |=3D WRAPFLAG_BE_BIT_SET(3); + + /* Set the wrapping algorithm bit. Just one algorithm option for now */ + objwrapflags |=3D WRAPFLAG_BE_FIELD_PREP(60, 63, 0x1); + + if (sb_audit_or_enforce_bit & sb_enforce_bit) { + pr_err("Cannot set both audit/enforce and enforce bits."); + rc =3D -EINVAL; + goto out_free_label; + } else if (sb_audit_or_enforce_bit) { + objwrapflags |=3D WRAPFLAG_BE_BIT_SET(1); + } else if (sb_enforce_bit) { + objwrapflags |=3D WRAPFLAG_BE_BIT_SET(2); + } + + *output_len =3D input_len + PLPKS_WRAPPING_BUF_DIFF; + + *output_buf =3D kzalloc(ALIGN(*output_len, PLPKS_WRAPPING_BUF_ALIGN), + GFP_KERNEL); + if (!(*output_buf)) { + pr_err("Output buffer allocation failed. Returning -ENOMEM."); + rc =3D -ENOMEM; + goto out_free_label; + } + + do { + rc =3D plpar_hcall9(H_PKS_WRAP_OBJECT, retbuf, + virt_to_phys(auth), virt_to_phys(label), + label->size, objwrapflags, + virt_to_phys(*input_buf), input_len, + virt_to_phys(*output_buf), *output_len, + continuetoken); + + continuetoken =3D retbuf[0]; + pseries_status =3D rc; + rc =3D pseries_status_to_err(rc); + } while (rc =3D=3D -EBUSY); + + if (rc) { + pr_err("H_PKS_WRAP_OBJECT failed. pseries_status=3D%d, rc=3D%d", + pseries_status, rc); + kfree(*output_buf); + *output_buf =3D NULL; + } else { + *output_len =3D retbuf[1]; + } + +out_free_label: + kfree(label); +out: + kfree(auth); + return rc; +} +EXPORT_SYMBOL_GPL(plpks_wrap_object); + +/** + * plpks_unwrap_object() - Unwrap an object using the default wrapping key + * stored in the PLPKS. + * @input_buf: buffer containing the data to be unwrapped + * @input_len: length of the input buffer + * @output_buf: buffer to store the unwrapped data + * @output_len: length of the output buffer + * + * The H_PKS_UNWRAP_OBJECT HCALL unwraps an object that was previously wra= pped + * using the H_PKS_WRAP_OBJECT HCALL. + * + * Possible reasons for the returned errno values: + * + * -ENXIO if PLPKS is not supported + * -EIO if PLPKS access is blocked due to the LPAR's state + * if PLPKS modification is blocked due to the LPAR's state + * if an error occurred while processing the request + * -EINVAL if invalid authorization parameter + * if invalid or unsupported object unwrapping flags + * if invalid input buffer parameter + * if invalid input buffer length parameter + * if invalid output buffer parameter + * if invalid output buffer length parameter + * if invalid continue token parameter + * if the wrapping key is not compatible with the wrapping + * algorithm + * if the wrapped object's format is not supported + * if the wrapped object is invalid + * -EPERM if access is denied + * -ENOENT if the wrapping key for the provided object was not found + * -EBUSY if unable to handle the request or long running operation + * initiated, retry later. + * + * Returns: On success 0 is returned, a negative errno if not. + */ +int plpks_unwrap_object(u8 **input_buf, u32 input_len, u8 **output_buf, + u32 *output_len) +{ + unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] =3D { 0 }; + struct plpks_auth *auth; + u64 continuetoken =3D 0; + u64 objwrapflags =3D 0; + int rc =3D 0, pseries_status =3D 0; + + auth =3D construct_auth(PLPKS_OS_OWNER); + if (IS_ERR(auth)) + return PTR_ERR(auth); + + *output_len =3D input_len - PLPKS_WRAPPING_BUF_DIFF; + *output_buf =3D kzalloc(ALIGN(*output_len, PLPKS_WRAPPING_BUF_ALIGN), + GFP_KERNEL); + if (!(*output_buf)) { + pr_err("Output buffer allocation failed. Returning -ENOMEM."); + rc =3D -ENOMEM; + goto out; + } + + do { + rc =3D plpar_hcall9(H_PKS_UNWRAP_OBJECT, retbuf, + virt_to_phys(auth), objwrapflags, + virt_to_phys(*input_buf), input_len, + virt_to_phys(*output_buf), *output_len, + continuetoken); + + continuetoken =3D retbuf[0]; + pseries_status =3D rc; + rc =3D pseries_status_to_err(rc); + } while (rc =3D=3D -EBUSY); + + if (rc) { + pr_err("H_PKS_UNWRAP_OBJECT failed. pseries_status=3D%d, rc=3D%d", + pseries_status, rc); + kfree(*output_buf); + *output_buf =3D NULL; + } else { + *output_len =3D retbuf[1]; + } + +out: + kfree(auth); + return rc; +} +EXPORT_SYMBOL_GPL(plpks_unwrap_object); + +/** + * plpks_read_os_var() - Fetch the data for the specified variable that is= owned + * by the OS consumer. * @var: variable to be read from the PLPKS * * The consumer or the owner of the object is the os kernel. The --=20 2.47.3