wireguard-linux/fs/verity/hash_algs.c, branch jd/unified-crypt-queue

fs-verity: use mempool for hash requests

2020-01-14T21:28:05Z

When initializing an fs-verity hash algorithm, also initialize a mempool that contains a single preallocated hash request object. Then replace the direct calls to ahash_request_alloc() and ahash_request_free() with allocating and freeing from this mempool. This eliminates the possibility of the allocation failing, which is desirable for the I/O path. This doesn't cause deadlocks because there's no case where multiple hash requests are needed at a time to make forward progress. Link: https://lore.kernel.org/r/20191231175545.20709-1-ebiggers@kernel.org Reviewed-by: Theodore Ts'o Signed-off-by: Eric Biggers

fs-verity: add SHA-512 support

2019-08-13T02:33:50Z

Add SHA-512 support to fs-verity. This is primarily a demonstration of the trivial changes needed to support a new hash algorithm in fs-verity; most users will still use SHA-256, due to the smaller space required to store the hashes. But some users may prefer SHA-512. Reviewed-by: Theodore Ts'o Reviewed-by: Jaegeuk Kim Signed-off-by: Eric Biggers

fs-verity: add Kconfig and the helper functions for hashing

2019-07-28T23:59:16Z

Add the beginnings of the fs/verity/ support layer, including the Kconfig option and various helper functions for hashing. To start, only SHA-256 is supported, but other hash algorithms can easily be added. Reviewed-by: Theodore Ts'o Reviewed-by: Jaegeuk Kim Signed-off-by: Eric Biggers