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/sound/hda_component.h | 67 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 include/sound/hda_component.h (limited to 'include/sound/hda_component.h') diff --git a/include/sound/hda_component.h b/include/sound/hda_component.h new file mode 100644 index 000000000..d4804c72d --- /dev/null +++ b/include/sound/hda_component.h @@ -0,0 +1,67 @@ +// SPDX-License-Identifier: GPL-2.0 +// HD-Audio helpers to sync with DRM driver + +#ifndef __SOUND_HDA_COMPONENT_H +#define __SOUND_HDA_COMPONENT_H + +#include +#include + +/* virtual idx for controller */ +#define HDA_CODEC_IDX_CONTROLLER HDA_MAX_CODECS + +#ifdef CONFIG_SND_HDA_COMPONENT +int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable); +void snd_hdac_display_power(struct hdac_bus *bus, unsigned int idx, + bool enable); +int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid, + int dev_id, int rate); +int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id, + bool *audio_enabled, char *buffer, int max_bytes); +int snd_hdac_acomp_init(struct hdac_bus *bus, + const struct drm_audio_component_audio_ops *aops, + int (*match_master)(struct device *, int, void *), + size_t extra_size); +int snd_hdac_acomp_exit(struct hdac_bus *bus); +int snd_hdac_acomp_register_notifier(struct hdac_bus *bus, + const struct drm_audio_component_audio_ops *ops); +#else +static inline int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable) +{ + return 0; +} +static inline void snd_hdac_display_power(struct hdac_bus *bus, + unsigned int idx, bool enable) +{ +} +static inline int snd_hdac_sync_audio_rate(struct hdac_device *codec, + hda_nid_t nid, int dev_id, int rate) +{ + return 0; +} +static inline int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, + int dev_id, bool *audio_enabled, + char *buffer, int max_bytes) +{ + return -ENODEV; +} +static inline int snd_hdac_acomp_init(struct hdac_bus *bus, + const struct drm_audio_component_audio_ops *aops, + int (*match_master)(struct device *, + int, void *), + size_t extra_size) +{ + return -ENODEV; +} +static inline int snd_hdac_acomp_exit(struct hdac_bus *bus) +{ + return 0; +} +static inline int snd_hdac_acomp_register_notifier(struct hdac_bus *bus, + const struct drm_audio_component_audio_ops *ops) +{ + return -ENODEV; +} +#endif + +#endif /* __SOUND_HDA_COMPONENT_H */ -- cgit v1.3.1