From beeebffc807531f69445356180238500f56951cc Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Sun, 15 Feb 2026 18:21:04 -0800 Subject: [PATCH] lib/crypto: powerpc/aes: Fix rndkey_from_vsx() on big endian CPUs I finally got a big endian PPC64 kernel to boot in QEMU. The PPC64 VSX optimized AES library code does work in that case, with the exception of rndkey_from_vsx() which doesn't take into account that the order in which the VSX code stores the round key words depends on the endianness. So fix rndkey_from_vsx() to do the right thing on big endian CPUs. Fixes: 7cf2082e74ce ("lib/crypto: powerpc/aes: Migrate POWER8 optimized code into library") Link: https://lore.kernel.org/r/20260216022104.332991-1-ebiggers@kernel.org Signed-off-by: Eric Biggers --- lib/crypto/powerpc/aes.h | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/lib/crypto/powerpc/aes.h b/lib/crypto/powerpc/aes.h index 42e0a993c619..5a36b637e6b9 100644 --- a/lib/crypto/powerpc/aes.h +++ b/lib/crypto/powerpc/aes.h @@ -95,7 +95,8 @@ static inline bool is_vsx_format(const struct p8_aes_key *key) } /* - * Convert a round key from VSX to generic format by reflecting the 16 bytes, + * Convert a round key from VSX to generic format by reflecting all 16 bytes (if + * little endian) or reflecting the bytes in each 4-byte word (if big endian), * and (if apply_inv_mix=true) applying InvMixColumn to each column. * * It would be nice if the VSX and generic key formats would be compatible. But @@ -107,6 +108,7 @@ static inline bool is_vsx_format(const struct p8_aes_key *key) */ static void rndkey_from_vsx(u32 out[4], const u32 in[4], bool apply_inv_mix) { + const bool be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN); u32 k0 = swab32(in[0]); u32 k1 = swab32(in[1]); u32 k2 = swab32(in[2]); @@ -118,10 +120,10 @@ static void rndkey_from_vsx(u32 out[4], const u32 in[4], bool apply_inv_mix) k2 = inv_mix_columns(k2); k3 = inv_mix_columns(k3); } - out[0] = k3; - out[1] = k2; - out[2] = k1; - out[3] = k0; + out[0] = be ? k0 : k3; + out[1] = be ? k1 : k2; + out[2] = be ? k2 : k1; + out[3] = be ? k3 : k0; } static void aes_preparekey_arch(union aes_enckey_arch *k,