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 --- crypto/ripemd.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 crypto/ripemd.h (limited to 'crypto/ripemd.h') diff --git a/crypto/ripemd.h b/crypto/ripemd.h new file mode 100644 index 000000000..b977785e2 --- /dev/null +++ b/crypto/ripemd.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Common values for RIPEMD algorithms + */ + +#ifndef _CRYPTO_RMD_H +#define _CRYPTO_RMD_H + +#define RMD160_DIGEST_SIZE 20 +#define RMD160_BLOCK_SIZE 64 + +/* initial values */ +#define RMD_H0 0x67452301UL +#define RMD_H1 0xefcdab89UL +#define RMD_H2 0x98badcfeUL +#define RMD_H3 0x10325476UL +#define RMD_H4 0xc3d2e1f0UL + +/* constants */ +#define RMD_K1 0x00000000UL +#define RMD_K2 0x5a827999UL +#define RMD_K3 0x6ed9eba1UL +#define RMD_K4 0x8f1bbcdcUL +#define RMD_K5 0xa953fd4eUL +#define RMD_K6 0x50a28be6UL +#define RMD_K7 0x5c4dd124UL +#define RMD_K8 0x6d703ef3UL +#define RMD_K9 0x7a6d76e9UL + +#endif -- cgit v1.3.1