lib/crypto: aes: Fix missing MMU protection for AES S-box

commit 74d74bb78a upstream.

__cacheline_aligned puts the data in the ".data..cacheline_aligned"
section, which isn't marked read-only i.e. it doesn't receive MMU
protection.  Replace it with ____cacheline_aligned which does the right
thing and just aligns the data while keeping it in ".rodata".

Fixes: b5e0b032b6 ("crypto: aes - add generic time invariant AES cipher")
Cc: stable@vger.kernel.org
Reported-by: Qingfang Deng <dqfext@gmail.com>
Closes: https://lore.kernel.org/r/20260105074712.498-1-dqfext@gmail.com/
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260107052023.174620-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

lib/crypto/aes.c

@@ -12,7 +12,7 @@
  * Emit the sbox as volatile const to prevent the compiler from doing
  * constant folding on sbox references involving fixed indexes.
  */
-static volatile const u8 __cacheline_aligned aes_sbox[] = {
+static volatile const u8 ____cacheline_aligned aes_sbox[] = {
 	0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
 	0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
 	0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
@@ -47,7 +47,7 @@ static volatile const u8 __cacheline_aligned aes_sbox[] = {
 	0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16,
 };
 
-static volatile const u8 __cacheline_aligned aes_inv_sbox[] = {
+static volatile const u8 ____cacheline_aligned aes_inv_sbox[] = {
 	0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38,
 	0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
 	0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87,