static int padlock_sha1_update_nano(struct shash_desc *desc,
			const u8 *data,	unsigned int len)
{
	struct sha1_state *sctx = shash_desc_ctx(desc);
	unsigned int partial, done;
	const u8 *src;
	/*The PHE require the out buffer must 128 bytes and 16-bytes aligned*/
	u8 buf[128 + PADLOCK_ALIGNMENT - STACK_ALIGN] __attribute__
		((aligned(STACK_ALIGN)));
	u8 *dst = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
	int ts_state;

	partial = sctx->count & 0x3f;
	sctx->count += len;
	done = 0;
	src = data;
	memcpy(dst, (u8 *)(sctx->state), SHA1_DIGEST_SIZE);

	if ((partial + len) >= SHA1_BLOCK_SIZE) {

		/* Append the bytes in state's buffer to a block to handle */
		if (partial) {
			done = -partial;
			memcpy(sctx->buffer + partial, data,
				done + SHA1_BLOCK_SIZE);
			src = sctx->buffer;
			ts_state = irq_ts_save();
			asm volatile (".byte 0xf3,0x0f,0xa6,0xc8"
			: "+S"(src), "+D"(dst) \
			: "a"((long)-1), "c"((unsigned long)1));
			irq_ts_restore(ts_state);
			done += SHA1_BLOCK_SIZE;
			src = data + done;
		}

		/* Process the left bytes from the input data */
		if (len - done >= SHA1_BLOCK_SIZE) {
			ts_state = irq_ts_save();
			asm volatile (".byte 0xf3,0x0f,0xa6,0xc8"
			: "+S"(src), "+D"(dst)
			: "a"((long)-1),
			"c"((unsigned long)((len - done) / SHA1_BLOCK_SIZE)));
			irq_ts_restore(ts_state);
			done += ((len - done) - (len - done) % SHA1_BLOCK_SIZE);
			src = data + done;
		}
		partial = 0;
	}
	memcpy((u8 *)(sctx->state), dst, SHA1_DIGEST_SIZE);
	memcpy(sctx->buffer + partial, src, len - done);

	return 0;
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.