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 --- scripts/kconfig/tests/pytest.ini | 7 +++++++ 1 file changed, 7 insertions(+) create mode 100644 scripts/kconfig/tests/pytest.ini (limited to 'scripts/kconfig/tests/pytest.ini') diff --git a/scripts/kconfig/tests/pytest.ini b/scripts/kconfig/tests/pytest.ini new file mode 100644 index 000000000..85d7ce8e4 --- /dev/null +++ b/scripts/kconfig/tests/pytest.ini @@ -0,0 +1,7 @@ +[pytest] +addopts = --verbose + +# Pytest requires that test files have unique names, because pytest imports +# them as top-level modules. It is silly to prefix or suffix a test file with +# the directory name that contains it. Use __init__.py for all test files. +python_files = __init__.py -- cgit v1.3.1