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/sysfs-class-power-surface | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-power-surface (limited to 'Documentation/ABI/testing/sysfs-class-power-surface') diff --git a/Documentation/ABI/testing/sysfs-class-power-surface b/Documentation/ABI/testing/sysfs-class-power-surface new file mode 100644 index 000000000..79cde4dcf --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-power-surface @@ -0,0 +1,15 @@ +What: /sys/class/power_supply//alarm +Date: April 2021 +KernelVersion: 5.13 +Contact: Maximilian Luz +Description: + Battery trip point. When the remaining battery capacity crosses this + value in either direction, the system will be notified and if + necessary woken. + + Set to zero to clear/disable. + + Access: Read, Write + + Valid values: In micro-Wh or micro-Ah, depending on the power unit + of the battery -- cgit v1.3.1