openrisc: fix arbitrary kernel memory access via or1k_atomic syscallgrafted

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 <ali@iusegentoo.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/drivers/clk/rockchip/Makefile b/drivers/clk/rockchip/Makefile
new file mode 100644
index 000000000..7c984ee00
--- /dev/null
+++ b/drivers/clk/rockchip/Makefile
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Rockchip Clock specific Makefile
+#
+
+obj-$(CONFIG_COMMON_CLK_ROCKCHIP) += clk-rockchip.o
+
+clk-rockchip-y += clk.o
+clk-rockchip-y += clk-pll.o
+clk-rockchip-y += clk-cpu.o
+clk-rockchip-y += clk-gate-grf.o
+clk-rockchip-y += clk-half-divider.o
+clk-rockchip-y += clk-inverter.o
+clk-rockchip-y += clk-mmc-phase.o
+clk-rockchip-y += clk-muxgrf.o
+clk-rockchip-y += clk-ddr.o
+clk-rockchip-y += gate-link.o
+clk-rockchip-$(CONFIG_RESET_CONTROLLER) += softrst.o
+
+obj-$(CONFIG_CLK_PX30)          += clk-px30.o
+obj-$(CONFIG_CLK_RV1103B)	+= clk-rv1103b.o
+obj-$(CONFIG_CLK_RV110X)        += clk-rv1108.o
+obj-$(CONFIG_CLK_RV1126)        += clk-rv1126.o
+obj-$(CONFIG_CLK_RV1126B)	+= clk-rv1126b.o rst-rv1126b.o
+obj-$(CONFIG_CLK_RK3036)        += clk-rk3036.o
+obj-$(CONFIG_CLK_RK312X)        += clk-rk3128.o
+obj-$(CONFIG_CLK_RK3188)        += clk-rk3188.o
+obj-$(CONFIG_CLK_RK322X)        += clk-rk3228.o
+obj-$(CONFIG_CLK_RK3288)        += clk-rk3288.o
+obj-$(CONFIG_CLK_RK3308)        += clk-rk3308.o
+obj-$(CONFIG_CLK_RK3328)        += clk-rk3328.o
+obj-$(CONFIG_CLK_RK3368)        += clk-rk3368.o
+obj-$(CONFIG_CLK_RK3399)        += clk-rk3399.o
+obj-$(CONFIG_CLK_RK3506)	+= clk-rk3506.o rst-rk3506.o
+obj-$(CONFIG_CLK_RK3528)	+= clk-rk3528.o rst-rk3528.o
+obj-$(CONFIG_CLK_RK3562)	+= clk-rk3562.o rst-rk3562.o
+obj-$(CONFIG_CLK_RK3568)	+= clk-rk3568.o
+obj-$(CONFIG_CLK_RK3576)	+= clk-rk3576.o rst-rk3576.o
+obj-$(CONFIG_CLK_RK3588)	+= clk-rk3588.o rst-rk3588.o