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 --- arch/powerpc/perf/Makefile | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 arch/powerpc/perf/Makefile (limited to 'arch/powerpc/perf/Makefile') diff --git a/arch/powerpc/perf/Makefile b/arch/powerpc/perf/Makefile new file mode 100644 index 000000000..78dd7e252 --- /dev/null +++ b/arch/powerpc/perf/Makefile @@ -0,0 +1,26 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-y += callchain.o callchain_$(BITS).o perf_regs.o +obj-$(CONFIG_COMPAT) += callchain_32.o + +obj-$(CONFIG_PPC_PERF_CTRS) += core-book3s.o +obj64-$(CONFIG_PPC_PERF_CTRS) += ppc970-pmu.o power5-pmu.o \ + power5+-pmu.o power6-pmu.o power7-pmu.o \ + isa207-common.o power8-pmu.o power9-pmu.o \ + generic-compat-pmu.o power10-pmu.o bhrb.o +obj32-$(CONFIG_PPC_PERF_CTRS) += mpc7450-pmu.o + +obj-$(CONFIG_PPC_POWERNV) += imc-pmu.o +obj-$(CONFIG_FSL_EMB_PERF_EVENT) += core-fsl-emb.o +obj-$(CONFIG_FSL_EMB_PERF_EVENT_E500) += e500-pmu.o e6500-pmu.o + +obj-$(CONFIG_HV_PERF_CTRS) += hv-24x7.o hv-gpci.o hv-common.o vpa-dtl.o + +obj-$(CONFIG_VPA_PMU) += vpa-pmu.o + +obj-$(CONFIG_KVM_BOOK3S_HV_PMU) += kvm-hv-pmu.o + +obj-$(CONFIG_PPC_8xx) += 8xx-pmu.o + +obj-$(CONFIG_PPC64) += $(obj64-y) +obj-$(CONFIG_PPC32) += $(obj32-y) -- cgit v1.3.1