From 78004e9a87f240df03e2f73120d291763c32e0a7 Mon Sep 17 00:00:00 2001 From: Ali Ahmet Memis Date: Fri, 21 Aug 2026 01:45:27 +0000 Subject: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly. l.lwz r29,0(r4) l.lwz r27,0(r5) l.sw 0(r4),r27 l.sw 0(r5),r29 The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries. A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly. This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context. Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT. [shorne@gmail.com: fix comment style] Fixes: 9d02a4283e9c ("OpenRISC: Boot code") Cc: stable@vger.kernel.org Signed-off-by: Ali Ahmet Memis Signed-off-by: Stafford Horne --- include/crypto/sm3.h | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 include/crypto/sm3.h (limited to 'include/crypto/sm3.h') diff --git a/include/crypto/sm3.h b/include/crypto/sm3.h new file mode 100644 index 000000000..371e8a661 --- /dev/null +++ b/include/crypto/sm3.h @@ -0,0 +1,87 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * SM3 hash algorithm + * + * Copyright (C) 2017 ARM Limited or its affiliates. + * Copyright (C) 2017 Gilad Ben-Yossef + * Copyright (C) 2021 Tianjia Zhang + */ + +#ifndef _CRYPTO_SM3_H +#define _CRYPTO_SM3_H + +#include + +#define SM3_DIGEST_SIZE 32 +#define SM3_BLOCK_SIZE 64 + +#define SM3_IVA 0x7380166f +#define SM3_IVB 0x4914b2b9 +#define SM3_IVC 0x172442d7 +#define SM3_IVD 0xda8a0600 +#define SM3_IVE 0xa96f30bc +#define SM3_IVF 0x163138aa +#define SM3_IVG 0xe38dee4d +#define SM3_IVH 0xb0fb0e4e + +/* State for the SM3 compression function */ +struct sm3_block_state { + u32 h[SM3_DIGEST_SIZE / 4]; +}; + +/** + * struct sm3_ctx - Context for hashing a message with SM3 + * @state: the compression function state + * @bytecount: number of bytes processed so far + * @buf: partial block buffer; bytecount % SM3_BLOCK_SIZE bytes are valid + */ +struct sm3_ctx { + struct sm3_block_state state; + u64 bytecount; + u8 buf[SM3_BLOCK_SIZE] __aligned(__alignof__(__be64)); +}; + +/** + * sm3_init() - Initialize an SM3 context for a new message + * @ctx: the context to initialize + * + * If you don't need incremental computation, consider sm3() instead. + * + * Context: Any context. + */ +void sm3_init(struct sm3_ctx *ctx); + +/** + * sm3_update() - Update an SM3 context with message data + * @ctx: the context to update; must have been initialized + * @data: the message data + * @len: the data length in bytes + * + * This can be called any number of times. + * + * Context: Any context. + */ +void sm3_update(struct sm3_ctx *ctx, const u8 *data, size_t len); + +/** + * sm3_final() - Finish computing an SM3 message digest + * @ctx: the context to finalize; must have been initialized + * @out: (output) the resulting SM3 message digest + * + * After finishing, this zeroizes @ctx. So the caller does not need to do it. + * + * Context: Any context. + */ +void sm3_final(struct sm3_ctx *ctx, u8 out[at_least SM3_DIGEST_SIZE]); + +/** + * sm3() - Compute SM3 message digest in one shot + * @data: the message data + * @len: the data length in bytes + * @out: (output) the resulting SM3 message digest + * + * Context: Any context. + */ +void sm3(const u8 *data, size_t len, u8 out[at_least SM3_DIGEST_SIZE]); + +#endif /* _CRYPTO_SM3_H */ -- cgit v1.3.1