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/gpu/nova/index.rst | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 Documentation/gpu/nova/index.rst (limited to 'Documentation/gpu/nova/index.rst') diff --git a/Documentation/gpu/nova/index.rst b/Documentation/gpu/nova/index.rst new file mode 100644 index 000000000..e39cb3163 --- /dev/null +++ b/Documentation/gpu/nova/index.rst @@ -0,0 +1,34 @@ +.. SPDX-License-Identifier: (GPL-2.0+ OR MIT) + +======================= +nova NVIDIA GPU drivers +======================= + +The nova driver project consists out of two separate drivers nova-core and +nova-drm and intends to supersede the nouveau driver for NVIDIA GPUs based on +the GPU System Processor (GSP). + +The following documents apply to both nova-core and nova-drm. + +.. toctree:: + :titlesonly: + + guidelines + +nova-core +========= + +The nova-core driver is the core driver for NVIDIA GPUs based on GSP. nova-core, +as the 1st level driver, provides an abstraction around the GPUs hard- and +firmware interfaces providing a common base for 2nd level drivers, such as the +vGPU manager VFIO driver and the nova-drm driver. + +.. toctree:: + :titlesonly: + + core/guidelines + core/todo + core/vbios + core/devinit + core/fwsec + core/falcon -- cgit v1.3.1