Messages in this thread | | | From | David Howells <> | Subject | [GIT PULL] Add EFI_CERT_X509_GUID support for dbx/mokx entries | Date | Thu, 11 Mar 2021 17:05:06 +0000 |
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Hi Linus,
Here's a set of patches from Eric Snowberg[1] that add support for EFI_CERT_X509_GUID entries in the dbx and mokx UEFI tables (such entries cause matching certificates to be rejected). These are currently ignored and only the hash entries are made use of. Additionally Eric included his patches to allow such certificates to be preloaded.
These patches deal with CVE-2020-26541.
To quote Eric:
This is the fifth patch series for adding support for EFI_CERT_X509_GUID entries [2]. It has been expanded to not only include dbx entries but also entries in the mokx. Additionally my series to preload these certificate [3] has also been included.
This series is based on v5.11-rc4.
Notes:
(*) These patches fix a security loophole rather than actual fixing kernel breakage, so they could theoretically wait for the next merge window if you prefer.
(*) Patch 3 adds the extract-cert target a second time. I think make should just handle this, though it could be better to add a config option specifically for building that program (it's used by multiple options).
Changes: - Changed Jarkko's acks to his kernel.org address.
ver #3: - Rolled in changes from Eric to fix conditional building issues[7].
ver #2: - Rolled in a fix to the second patch to include certs/common.h in certs/common.c[6].
ver #1: - I've modified the first patch in the series to fix a configuration problem[4][5], to move the added functions to a more logical place within thefile and to add kerneldoc comments.
Link: https://lore.kernel.org/r/20210122181054.32635-1-eric.snowberg@oracle.com [1] Link: https://patchwork.kernel.org/project/linux-security-module/patch/20200916004927.64276-1-eric.snowberg@oracle.com/ [2] Link: https://lore.kernel.org/patchwork/cover/1315485/ [3] Link: https://lore.kernel.org/r/bc2c24e3-ed68-2521-0bf4-a1f6be4a895d@infradead.org/ [4] Link: https://lore.kernel.org/r/20210225125638.1841436-1-arnd@kernel.org/ [5] Link: https://lore.kernel.org/r/EDA280F9-F72D-4181-93C7-CDBE95976FF7@oracle.com/ [6] Link: https://lore.kernel.org/r/161428671215.677100.6372209948022011988.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/161433310139.902181.11787442834918634133.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/161529604216.163428.4905283330048991183.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/20210304175030.184131-1-eric.snowberg@oracle.com/ [7]
David --- The following changes since commit 8f0bfc25c907f38e7f9dc498e8f43000d77327ef:
watch_queue: rectify kernel-doc for init_watch() (2021-01-26 11:16:34 +0000)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/keys-cve-2020-26541-v3
for you to fetch changes up to ebd9c2ae369a45bdd9f8615484db09be58fc242b:
integrity: Load mokx variables into the blacklist keyring (2021-03-11 16:34:48 +0000)
---------------------------------------------------------------- Fix CVE-2020-26541
---------------------------------------------------------------- Eric Snowberg (4): certs: Add EFI_CERT_X509_GUID support for dbx entries certs: Move load_system_certificate_list to a common function certs: Add ability to preload revocation certs integrity: Load mokx variables into the blacklist keyring
certs/Kconfig | 17 ++++++ certs/Makefile | 21 ++++++- certs/blacklist.c | 64 ++++++++++++++++++++++ certs/blacklist.h | 2 + certs/common.c | 57 +++++++++++++++++++ certs/common.h | 9 +++ certs/revocation_certificates.S | 21 +++++++ certs/system_keyring.c | 55 +++---------------- include/keys/system_keyring.h | 15 +++++ scripts/Makefile | 1 + .../integrity/platform_certs/keyring_handler.c | 11 ++++ security/integrity/platform_certs/load_uefi.c | 20 ++++++- 12 files changed, 242 insertions(+), 51 deletions(-) create mode 100644 certs/common.c create mode 100644 certs/common.h create mode 100644 certs/revocation_certificates.S
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