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 --- sound/soc/sof/sof-client-probes.h | 72 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 sound/soc/sof/sof-client-probes.h (limited to 'sound/soc/sof/sof-client-probes.h') diff --git a/sound/soc/sof/sof-client-probes.h b/sound/soc/sof/sof-client-probes.h new file mode 100644 index 000000000..47d0582b8 --- /dev/null +++ b/sound/soc/sof/sof-client-probes.h @@ -0,0 +1,72 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef __SOF_CLIENT_PROBES_H +#define __SOF_CLIENT_PROBES_H + +struct snd_compr_stream; +struct snd_compr_tstamp64; +struct snd_compr_params; +struct sof_client_dev; +struct snd_soc_dai; + +/* + * Callbacks used on platforms where the control for audio is split between + * DSP and host, like HDA. + */ +struct sof_probes_host_ops { + int (*startup)(struct sof_client_dev *cdev, struct snd_compr_stream *cstream, + struct snd_soc_dai *dai, u32 *stream_id); + int (*shutdown)(struct sof_client_dev *cdev, struct snd_compr_stream *cstream, + struct snd_soc_dai *dai); + int (*set_params)(struct sof_client_dev *cdev, struct snd_compr_stream *cstream, + struct snd_compr_params *params, + struct snd_soc_dai *dai); + int (*trigger)(struct sof_client_dev *cdev, struct snd_compr_stream *cstream, + int cmd, struct snd_soc_dai *dai); + int (*pointer)(struct sof_client_dev *cdev, struct snd_compr_stream *cstream, + struct snd_compr_tstamp64 *tstamp, + struct snd_soc_dai *dai); +}; + +struct sof_probe_point_desc { + unsigned int buffer_id; + unsigned int purpose; + unsigned int stream_tag; +} __packed; + +enum sof_probe_info_type { + PROBES_INFO_ACTIVE_PROBES, + PROBES_INFO_AVAILABE_PROBES, +}; + +struct sof_probes_ipc_ops { + int (*init)(struct sof_client_dev *cdev, u32 stream_tag, + size_t buffer_size); + int (*deinit)(struct sof_client_dev *cdev); + int (*points_info)(struct sof_client_dev *cdev, + struct sof_probe_point_desc **desc, + size_t *num_desc, enum sof_probe_info_type type); + int (*point_print)(struct sof_client_dev *cdev, char *buf, size_t size, + struct sof_probe_point_desc *desc); + int (*points_add)(struct sof_client_dev *cdev, + struct sof_probe_point_desc *desc, + size_t num_desc); + int (*points_remove)(struct sof_client_dev *cdev, + unsigned int *buffer_id, size_t num_buffer_id); +}; + +extern const struct sof_probes_ipc_ops ipc3_probe_ops; +extern const struct sof_probes_ipc_ops ipc4_probe_ops; + +struct sof_probes_priv { + struct dentry *dfs_points; + struct dentry *dfs_points_remove; + u32 extractor_stream_tag; + struct snd_soc_card card; + void *ipc_priv; + + const struct sof_probes_host_ops *host_ops; + const struct sof_probes_ipc_ops *ipc_ops; +}; + +#endif -- cgit v1.3.1