From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Serge E. Hallyn" Date: Thu, 06 Dec 2018 23:09:16 +0000 Subject: Re: [PATCH 7/7] ima: Support platform keyring for kernel appraisal Message-Id: <20181206230916.GA10203@mail.hallyn.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit List-Id: References: <20181125151500.8298-1-nayna@linux.ibm.com> <20181125151500.8298-8-nayna@linux.ibm.com> In-Reply-To: <20181125151500.8298-8-nayna@linux.ibm.com> To: Nayna Jain Cc: linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, zohar@linux.ibm.com, dhowells@redhat.com, jforbes@redhat.com, seth.forshee@canonical.com, kexec@lists.infradead.org, keyrings@vger.kernel.org, vgoyal@redhat.com, ebiederm@xmission.com, mpe@ellerman.id.au On Sun, Nov 25, 2018 at 08:45:00PM +0530, Nayna Jain wrote: > On secure boot enabled systems, the bootloader verifies the kernel > image and possibly the initramfs signatures based on a set of keys. A > soft reboot(kexec) of the system, with the same kernel image and > initramfs, requires access to the original keys to verify the > signatures. > > This patch allows IMA-appraisal access to those original keys, now > loaded on the platform keyring, needed for verifying the kernel image > and initramfs signatures. > > Signed-off-by: Nayna Jain > Reviewed-by: Mimi Zohar The overall set seems sensible to me, and I see no errors here, Acked-by: Serge Hallyn I do think that replacing the 'rc' with xattr_len in the previous line might help future readers save a few cycles. > --- > security/integrity/ima/ima_appraise.c | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c > index deec1804a00a..9c13585e7d3e 100644 > --- a/security/integrity/ima/ima_appraise.c > +++ b/security/integrity/ima/ima_appraise.c > @@ -294,7 +294,16 @@ int ima_appraise_measurement(enum ima_hooks func, > iint->ima_hash->length); > if (rc = -EOPNOTSUPP) { > status = INTEGRITY_UNKNOWN; > - } else if (rc) { > + break; > + } > + if (rc && func = KEXEC_KERNEL_CHECK) > + rc = integrity_digsig_verify( > + INTEGRITY_KEYRING_PLATFORM, > + (const char *)xattr_value, > + xattr_len, > + iint->ima_hash->digest, > + iint->ima_hash->length); > + if (rc) { > cause = "invalid-signature"; > status = INTEGRITY_FAIL; > } else { > -- > 2.13.6 >