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lib/crypto/poly1305: Fix arm64's poly1305_blocks_arch()

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For some reason arm64's Poly1305 code got changed to ignore the padbit
argument.  As a result, the output is incorrect when the message length
is not a multiple of 16 (which is not reached with the standard
ChaCha20Poly1305, but bcachefs could reach this).  Fix this.

Fixes: a59e5468a9 ("crypto: arm64/poly1305 - Add block-only interface")
Reported-by: Kent Overstreet <kent.overstreet@linux.dev>
Tested-by: Kent Overstreet <kent.overstreet@linux.dev>
Link: https://lore.kernel.org/r/20250616010654.367302-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2025-06-15 18:06:54 -07:00
parent 2f13daee2a
commit 9d4204a810
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/lib/crypto/poly1305-glue.c
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@ -38,14 +38,14 @@ void poly1305_blocks_arch(struct poly1305_block_state *state, const u8 *src,
unsigned int todo = min_t(unsigned int, len, SZ_4K);
kernel_neon_begin();
poly1305_blocks_neon(state, src, todo, 1);
poly1305_blocks_neon(state, src, todo, padbit);
kernel_neon_end();
len -= todo;
src += todo;
} while (len);
} else
poly1305_blocks(state, src, len, 1);
poly1305_blocks(state, src, len, padbit);
}
EXPORT_SYMBOL_GPL(poly1305_blocks_arch);