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UPSTREAM: fsverity: relax build time dependency on CRYPTO_SHA256

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CONFIG_CRYPTO_SHA256 denotes the generic C implementation of the SHA-256
shash algorithm, which is selected as the default crypto shash provider
for fsverity. However, fsverity has no strict link time dependency, and
the same shash could be exposed by an optimized implementation, and arm64
has a number of those (scalar, NEON-based and one based on special crypto
instructions). In such cases, it makes little sense to require that the
generic C implementation is incorporated as well, given that it will never
be called.

To address this, relax the 'select' clause to 'imply' so that the generic
driver can be omitted from the build if desired.

Bug: 153614920
Acked-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit e3a606f2c544b231f6079c8c5fea451e772e1139)
Change-Id: I3546d2ff037f8015af0c47e58c9e5ea656734d22
Signed-off-by: Ard Biesheuvel <ardb@google.com>
This commit is contained in:
Ard Biesheuvel 2021-04-21 09:55:11 +02:00 committed by Ard Biesheuvel
parent f90c8ffbd8
commit a9e54b6010
1 changed files with 6 additions and 2 deletions
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8
fs/verity/Kconfig
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@ -3,9 +3,13 @@
config FS_VERITY
bool "FS Verity (read-only file-based authenticity protection)"
select CRYPTO
# SHA-256 is selected as it's intended to be the default hash algorithm.
# SHA-256 is implied as it's intended to be the default hash algorithm.
# To avoid bloat, other wanted algorithms must be selected explicitly.
select CRYPTO_SHA256
# Note that CRYPTO_SHA256 denotes the generic C implementation, but
# some architectures provided optimized implementations of the same
# algorithm that may be used instead. In this case, CRYPTO_SHA256 may
# be omitted even if SHA-256 is being used.
imply CRYPTO_SHA256
help
This option enables fs-verity. fs-verity is the dm-verity
mechanism implemented at the file level. On supported