kernel/linux.git/include/linux/dm-verity-loadpin.h, branch v6.12.80

LoadPin: Annotate struct dm_verity_loadpin_trusted_root_digest with __counted_by

2023-08-25T23:07:30+00:00

Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct dm_verity_loadpin_trusted_root_digest. Additionally, since the element count member must be set before accessing the annotated flexible array member, move its initialization earlier. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Alasdair Kergon Cc: Mike Snitzer Cc: dm-devel@redhat.com Cc: Paul Moore Cc: James Morris Cc: "Serge E. Hallyn" Cc: linux-security-module@vger.kernel.org Link: https://lore.kernel.org/r/20230817235955.never.762-kees@kernel.org Signed-off-by: Kees Cook

dm: verity-loadpin: Use CONFIG_SECURITY_LOADPIN_VERITY for conditional compilation

2022-07-08T17:47:07+00:00

The verity glue for LoadPin is only needed when CONFIG_SECURITY_LOADPIN_VERITY is set, use this option for conditional compilation instead of the combo of CONFIG_DM_VERITY and CONFIG_SECURITY_LOADPIN. Signed-off-by: Matthias Kaehlcke Acked-by: Mike Snitzer Link: https://lore.kernel.org/lkml/20220627083512.v7.3.I5aca2dcc3b06de4bf53696cd21329dce8272b8aa@changeid Signed-off-by: Kees Cook

dm: Add verity helpers for LoadPin

2022-07-08T17:46:46+00:00

LoadPin limits loading of kernel modules, firmware and certain other files to a 'pinned' file system (typically a read-only rootfs). To provide more flexibility LoadPin is being extended to also allow loading these files from trusted dm-verity devices. For that purpose LoadPin can be provided with a list of verity root digests that it should consider as trusted. Add a bunch of helpers to allow LoadPin to check whether a DM device is a trusted verity device. The new functions broadly fall in two categories: those that need access to verity internals (like the root digest), and the 'glue' between LoadPin and verity. The new file dm-verity-loadpin.c contains the glue functions. Signed-off-by: Matthias Kaehlcke Acked-by: Mike Snitzer Link: https://lore.kernel.org/lkml/20220627083512.v7.1.I3e928575a23481121e73286874c4c2bdb403355d@changeid Signed-off-by: Kees Cook