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-hyperv | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 Documentation/ABI/testing/debugfs-hyperv (limited to 'Documentation/ABI/testing/debugfs-hyperv') diff --git a/Documentation/ABI/testing/debugfs-hyperv b/Documentation/ABI/testing/debugfs-hyperv new file mode 100644 index 000000000..9185e1b06 --- /dev/null +++ b/Documentation/ABI/testing/debugfs-hyperv @@ -0,0 +1,23 @@ +What: /sys/kernel/debug/hyperv//fuzz_test_state +Date: October 2019 +KernelVersion: 5.5 +Contact: Branden Bonaby +Description: Fuzz testing status of a vmbus device, whether its in an ON + state or a OFF state +Users: Debugging tools + +What: /sys/kernel/debug/hyperv//delay/fuzz_test_buffer_interrupt_delay +Date: October 2019 +KernelVersion: 5.5 +Contact: Branden Bonaby +Description: Fuzz testing buffer interrupt delay value between 0 - 1000 + microseconds (inclusive). +Users: Debugging tools + +What: /sys/kernel/debug/hyperv//delay/fuzz_test_message_delay +Date: October 2019 +KernelVersion: 5.5 +Contact: Branden Bonaby +Description: Fuzz testing message delay value between 0 - 1000 microseconds + (inclusive). +Users: Debugging tools -- cgit v1.3.1