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 --- Documentation/ABI/testing/debugfs-alienware-wmi | 64 +++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 Documentation/ABI/testing/debugfs-alienware-wmi (limited to 'Documentation/ABI/testing/debugfs-alienware-wmi') diff --git a/Documentation/ABI/testing/debugfs-alienware-wmi b/Documentation/ABI/testing/debugfs-alienware-wmi new file mode 100644 index 000000000..c7f525d6b --- /dev/null +++ b/Documentation/ABI/testing/debugfs-alienware-wmi @@ -0,0 +1,64 @@ +What: /sys/kernel/debug/alienware-wmi-/system_description +Date: March 2025 +KernelVersion: 6.15 +Contact: Kurt Borja +Description: + This file exposes the raw ``system_description`` number reported + by the WMAX device. + + Only present on devices with the AWCC interface. + + See Documentation/admin-guide/laptops/alienware-wmi.rst for + details. + + RO + +What: /sys/kernel/debug/alienware-wmi-/hwmon_data +Date: March 2025 +KernelVersion: 6.15 +Contact: Kurt Borja +Description: + This file exposes HWMON private data. + + Includes fan sensor count, temperature sensor count, internal + fan IDs and internal temp IDs. + + See Documentation/admin-guide/laptops/alienware-wmi.rst for + details. + + RO + +What: /sys/kernel/debug/alienware-wmi-/pprof_data +Date: March 2025 +KernelVersion: 6.15 +Contact: Kurt Borja +Description: + This file exposes Platform Profile private data. + + Includes internal mapping to platform profiles and thermal + profile IDs. + + See Documentation/admin-guide/laptops/alienware-wmi.rst for + details. + + RO + +What: /sys/kernel/debug/alienware-wmi-/gpio_ctl/total_gpios +Date: May 2025 +KernelVersion: 6.16 +Contact: Kurt Borja +Description: + Total number of GPIO pins reported by the device. + + RO + +What: /sys/kernel/debug/alienware-wmi-/gpio_ctl/pinX +Date: May 2025 +KernelVersion: 6.16 +Contact: Kurt Borja +Description: + This file controls GPIO pin X status. + + See Documentation/wmi/devices/alienware-wmi.rst for details. + + RW -- cgit v1.3.1