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 259C2146D53; Tue, 9 Jul 2024 11:21:56 +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=1720524116; cv=none; b=jkAKDbXMrIVDTbEH39jg4oHRMIthFncTCtMgy5/oPn+L/8Os6NnPLgY4/tAn/JlCpsLQZpAoTg/OQ5+zeigBJv3SGhhn5QZ/Iq12uEZvbSOt87pEYDFl5S//1xaQvYGx9/mwBpAxkxl2xc1HnyQM0riOIN+3cg/8LMQiDSn+VkU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720524116; c=relaxed/simple; bh=er1xdiYBJucz02ZC6UnLd39E/pWscQlYZ24uTeUZs/Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DqMo1r0lrEWdsJapaEVFiE6rhzHyq9u/hJ+kXz94SYik3TUnTz+ypftccQrfZZXslpX6pPtJM9Hme0C7e6WQiGZjUGKIzE0fSZ+bv+vlMHHhgHFtuq5HFi5GPJGtRdBpw7pnefRZfyk4AlBPBuv4rry0EEiZU6cG3Bvj5Cgp03k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=HBeVFQ/f; 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="HBeVFQ/f" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9CD66C3277B; Tue, 9 Jul 2024 11:21:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1720524116; bh=er1xdiYBJucz02ZC6UnLd39E/pWscQlYZ24uTeUZs/Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HBeVFQ/fNatGSr776H1Y3WUdc33ALxmUJ4zcg/KA/sfJvMxqD/o5RXvZG1Elepduq FOA4BVHBVAUFzgqFT5tIvlSv5H3haRCUTEZVfRS+YZAOnJAC0YQQBfybkcPJbqP0n3 /VDGDRJDMPn1IaTaLYRU9tEsy49tBFoHTPNULED8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Harald Freudenberger , Ingo Franzki , Heiko Carstens , Holger Dengler , Alexander Gordeev , Sasha Levin Subject: [PATCH 6.9 076/197] s390/pkey: Wipe copies of protected- and secure-keys Date: Tue, 9 Jul 2024 13:08:50 +0200 Message-ID: <20240709110711.910770062@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240709110708.903245467@linuxfoundation.org> References: <20240709110708.903245467@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 6.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Holger Dengler [ Upstream commit f2ebdadd85af4f4d0cae1e5d009c70eccc78c207 ] Although the clear-key of neither protected- nor secure-keys is accessible, this key material should only be visible to the calling process. So wipe all copies of protected- or secure-keys from stack, even in case of an error. Reviewed-by: Harald Freudenberger Reviewed-by: Ingo Franzki Acked-by: Heiko Carstens Signed-off-by: Holger Dengler Signed-off-by: Alexander Gordeev Signed-off-by: Sasha Levin --- drivers/s390/crypto/pkey_api.c | 80 ++++++++++++++++------------------ 1 file changed, 37 insertions(+), 43 deletions(-) diff --git a/drivers/s390/crypto/pkey_api.c b/drivers/s390/crypto/pkey_api.c index 1aa78a74fbade..ffc0b5db55c29 100644 --- a/drivers/s390/crypto/pkey_api.c +++ b/drivers/s390/crypto/pkey_api.c @@ -1359,10 +1359,9 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, rc = cca_genseckey(kgs.cardnr, kgs.domain, kgs.keytype, kgs.seckey.seckey); pr_debug("%s cca_genseckey()=%d\n", __func__, rc); - if (rc) - break; - if (copy_to_user(ugs, &kgs, sizeof(kgs))) - return -EFAULT; + if (!rc && copy_to_user(ugs, &kgs, sizeof(kgs))) + rc = -EFAULT; + memzero_explicit(&kgs, sizeof(kgs)); break; } case PKEY_CLR2SECK: { @@ -1390,10 +1389,9 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, ksp.seckey.seckey, ksp.protkey.protkey, &ksp.protkey.len, &ksp.protkey.type); pr_debug("%s cca_sec2protkey()=%d\n", __func__, rc); - if (rc) - break; - if (copy_to_user(usp, &ksp, sizeof(ksp))) - return -EFAULT; + if (!rc && copy_to_user(usp, &ksp, sizeof(ksp))) + rc = -EFAULT; + memzero_explicit(&ksp, sizeof(ksp)); break; } case PKEY_CLR2PROTK: { @@ -1437,10 +1435,9 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, rc = pkey_skey2pkey(ksp.seckey.seckey, ksp.protkey.protkey, &ksp.protkey.len, &ksp.protkey.type); pr_debug("%s pkey_skey2pkey()=%d\n", __func__, rc); - if (rc) - break; - if (copy_to_user(usp, &ksp, sizeof(ksp))) - return -EFAULT; + if (!rc && copy_to_user(usp, &ksp, sizeof(ksp))) + rc = -EFAULT; + memzero_explicit(&ksp, sizeof(ksp)); break; } case PKEY_VERIFYKEY: { @@ -1452,10 +1449,9 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, rc = pkey_verifykey(&kvk.seckey, &kvk.cardnr, &kvk.domain, &kvk.keysize, &kvk.attributes); pr_debug("%s pkey_verifykey()=%d\n", __func__, rc); - if (rc) - break; - if (copy_to_user(uvk, &kvk, sizeof(kvk))) - return -EFAULT; + if (!rc && copy_to_user(uvk, &kvk, sizeof(kvk))) + rc = -EFAULT; + memzero_explicit(&kvk, sizeof(kvk)); break; } case PKEY_GENPROTK: { @@ -1468,10 +1464,9 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, rc = pkey_genprotkey(kgp.keytype, kgp.protkey.protkey, &kgp.protkey.len, &kgp.protkey.type); pr_debug("%s pkey_genprotkey()=%d\n", __func__, rc); - if (rc) - break; - if (copy_to_user(ugp, &kgp, sizeof(kgp))) - return -EFAULT; + if (!rc && copy_to_user(ugp, &kgp, sizeof(kgp))) + rc = -EFAULT; + memzero_explicit(&kgp, sizeof(kgp)); break; } case PKEY_VERIFYPROTK: { @@ -1483,6 +1478,7 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, rc = pkey_verifyprotkey(kvp.protkey.protkey, kvp.protkey.len, kvp.protkey.type); pr_debug("%s pkey_verifyprotkey()=%d\n", __func__, rc); + memzero_explicit(&kvp, sizeof(kvp)); break; } case PKEY_KBLOB2PROTK: { @@ -1500,10 +1496,9 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, &ktp.protkey.len, &ktp.protkey.type); pr_debug("%s pkey_keyblob2pkey()=%d\n", __func__, rc); kfree_sensitive(kkey); - if (rc) - break; - if (copy_to_user(utp, &ktp, sizeof(ktp))) - return -EFAULT; + if (!rc && copy_to_user(utp, &ktp, sizeof(ktp))) + rc = -EFAULT; + memzero_explicit(&ktp, sizeof(ktp)); break; } case PKEY_GENSECK2: { @@ -1529,23 +1524,23 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, pr_debug("%s pkey_genseckey2()=%d\n", __func__, rc); kfree(apqns); if (rc) { - kfree(kkey); + kfree_sensitive(kkey); break; } if (kgs.key) { if (kgs.keylen < klen) { - kfree(kkey); + kfree_sensitive(kkey); return -EINVAL; } if (copy_to_user(kgs.key, kkey, klen)) { - kfree(kkey); + kfree_sensitive(kkey); return -EFAULT; } } kgs.keylen = klen; if (copy_to_user(ugs, &kgs, sizeof(kgs))) rc = -EFAULT; - kfree(kkey); + kfree_sensitive(kkey); break; } case PKEY_CLR2SECK2: { @@ -1574,18 +1569,18 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, pr_debug("%s pkey_clr2seckey2()=%d\n", __func__, rc); kfree(apqns); if (rc) { - kfree(kkey); + kfree_sensitive(kkey); memzero_explicit(&kcs, sizeof(kcs)); break; } if (kcs.key) { if (kcs.keylen < klen) { - kfree(kkey); + kfree_sensitive(kkey); memzero_explicit(&kcs, sizeof(kcs)); return -EINVAL; } if (copy_to_user(kcs.key, kkey, klen)) { - kfree(kkey); + kfree_sensitive(kkey); memzero_explicit(&kcs, sizeof(kcs)); return -EFAULT; } @@ -1594,7 +1589,7 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, if (copy_to_user(ucs, &kcs, sizeof(kcs))) rc = -EFAULT; memzero_explicit(&kcs, sizeof(kcs)); - kfree(kkey); + kfree_sensitive(kkey); break; } case PKEY_VERIFYKEY2: { @@ -1611,7 +1606,7 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, &kvk.cardnr, &kvk.domain, &kvk.type, &kvk.size, &kvk.flags); pr_debug("%s pkey_verifykey2()=%d\n", __func__, rc); - kfree(kkey); + kfree_sensitive(kkey); if (rc) break; if (copy_to_user(uvk, &kvk, sizeof(kvk))) @@ -1642,10 +1637,9 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, pr_debug("%s pkey_keyblob2pkey2()=%d\n", __func__, rc); kfree(apqns); kfree_sensitive(kkey); - if (rc) - break; - if (copy_to_user(utp, &ktp, sizeof(ktp))) - return -EFAULT; + if (!rc && copy_to_user(utp, &ktp, sizeof(ktp))) + rc = -EFAULT; + memzero_explicit(&ktp, sizeof(ktp)); break; } case PKEY_APQNS4K: { @@ -1673,7 +1667,7 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, rc = pkey_apqns4key(kkey, kak.keylen, kak.flags, apqns, &nr_apqns); pr_debug("%s pkey_apqns4key()=%d\n", __func__, rc); - kfree(kkey); + kfree_sensitive(kkey); if (rc && rc != -ENOSPC) { kfree(apqns); break; @@ -1759,7 +1753,7 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, protkey = kmalloc(protkeylen, GFP_KERNEL); if (!protkey) { kfree(apqns); - kfree(kkey); + kfree_sensitive(kkey); return -ENOMEM; } rc = pkey_keyblob2pkey3(apqns, ktp.apqn_entries, @@ -1769,20 +1763,20 @@ static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd, kfree(apqns); kfree_sensitive(kkey); if (rc) { - kfree(protkey); + kfree_sensitive(protkey); break; } if (ktp.pkey && ktp.pkeylen) { if (protkeylen > ktp.pkeylen) { - kfree(protkey); + kfree_sensitive(protkey); return -EINVAL; } if (copy_to_user(ktp.pkey, protkey, protkeylen)) { - kfree(protkey); + kfree_sensitive(protkey); return -EFAULT; } } - kfree(protkey); + kfree_sensitive(protkey); ktp.pkeylen = protkeylen; if (copy_to_user(utp, &ktp, sizeof(ktp))) return -EFAULT; -- 2.43.0