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 --- net/nfc/nci/lib.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 net/nfc/nci/lib.c (limited to 'net/nfc/nci/lib.c') diff --git a/net/nfc/nci/lib.c b/net/nfc/nci/lib.c new file mode 100644 index 000000000..473323f80 --- /dev/null +++ b/net/nfc/nci/lib.c @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * The NFC Controller Interface is the communication protocol between an + * NFC Controller (NFCC) and a Device Host (DH). + * + * Copyright (C) 2011 Texas Instruments, Inc. + * + * Written by Ilan Elias + * + * Acknowledgements: + * This file is based on lib.c, which was written + * by Maxim Krasnyansky. + */ + +#include +#include +#include +#include + +#include +#include + +/* NCI status codes to Unix errno mapping */ +int nci_to_errno(__u8 code) +{ + switch (code) { + case NCI_STATUS_OK: + return 0; + + case NCI_STATUS_REJECTED: + return -EBUSY; + + case NCI_STATUS_RF_FRAME_CORRUPTED: + return -EBADMSG; + + case NCI_STATUS_NOT_INITIALIZED: + return -EHOSTDOWN; + + case NCI_STATUS_SYNTAX_ERROR: + case NCI_STATUS_SEMANTIC_ERROR: + case NCI_STATUS_INVALID_PARAM: + case NCI_STATUS_RF_PROTOCOL_ERROR: + case NCI_STATUS_NFCEE_PROTOCOL_ERROR: + return -EPROTO; + + case NCI_STATUS_UNKNOWN_GID: + case NCI_STATUS_UNKNOWN_OID: + return -EBADRQC; + + case NCI_STATUS_MESSAGE_SIZE_EXCEEDED: + return -EMSGSIZE; + + case NCI_STATUS_DISCOVERY_ALREADY_STARTED: + return -EALREADY; + + case NCI_STATUS_DISCOVERY_TARGET_ACTIVATION_FAILED: + case NCI_STATUS_NFCEE_INTERFACE_ACTIVATION_FAILED: + return -ECONNREFUSED; + + case NCI_STATUS_RF_TRANSMISSION_ERROR: + case NCI_STATUS_NFCEE_TRANSMISSION_ERROR: + return -ECOMM; + + case NCI_STATUS_RF_TIMEOUT_ERROR: + case NCI_STATUS_NFCEE_TIMEOUT_ERROR: + return -ETIMEDOUT; + + case NCI_STATUS_FAILED: + default: + return -ENOSYS; + } +} +EXPORT_SYMBOL(nci_to_errno); -- cgit v1.3.1