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 --- tools/perf/bench/Build | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 tools/perf/bench/Build (limited to 'tools/perf/bench/Build') diff --git a/tools/perf/bench/Build b/tools/perf/bench/Build new file mode 100644 index 000000000..67b76fe20 --- /dev/null +++ b/tools/perf/bench/Build @@ -0,0 +1,32 @@ +perf-bench-y += sched-messaging.o +perf-bench-y += sched-pipe.o +perf-bench-y += sched-seccomp-notify.o +perf-bench-y += syscall.o +perf-bench-y += mem-functions.o +perf-bench-y += futex.o +perf-bench-y += futex-hash.o +perf-bench-y += futex-wake.o +perf-bench-y += futex-wake-parallel.o +perf-bench-y += futex-requeue.o +perf-bench-y += futex-lock-pi.o +perf-bench-y += epoll-wait.o +perf-bench-y += epoll-ctl.o +perf-bench-y += synthesize.o +perf-bench-y += kallsyms-parse.o +perf-bench-y += find-bit-bench.o +perf-bench-y += inject-buildid.o +perf-bench-y += evlist-open-close.o +perf-bench-y += breakpoint.o +perf-bench-y += pmu-scan.o +perf-bench-y += uprobe.o + +perf-bench-$(CONFIG_X86_64) += mem-memcpy-x86-64-asm.o +perf-bench-$(CONFIG_X86_64) += mem-memset-x86-64-asm.o + +perf-bench-$(CONFIG_NUMA) += numa.o + +ifeq ($(CONFIG_PERF_BPF_SKEL),y) +include $(srctree)/tools/perf/bpf_skel.mak + +$(OUTPUT)bench/uprobe.o: $(SKEL_OUT)/bench_uprobe.skel.h +endif -- cgit v1.3.1