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, 44 insertions, 0 deletions

diff --git a/drivers/pinctrl/mediatek/Makefile b/drivers/pinctrl/mediatek/Makefile
new file mode 100644
index 000000000..6dc17b0c2
--- /dev/null
+++ b/drivers/pinctrl/mediatek/Makefile
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: GPL-2.0
+# Core
+obj-$(CONFIG_EINT_MTK)			+= mtk-eint.o
+obj-$(CONFIG_PINCTRL_MTK)		+= pinctrl-mtk-common.o
+obj-$(CONFIG_PINCTRL_MTK_V2)		+= pinctrl-mtk-common-v2.o
+obj-$(CONFIG_PINCTRL_MTK_MTMIPS)	+= pinctrl-mtmips.o
+obj-$(CONFIG_PINCTRL_MTK_MOORE)		+= pinctrl-moore.o
+obj-$(CONFIG_PINCTRL_MTK_PARIS)		+= pinctrl-paris.o
+
+# SoC Drivers
+obj-$(CONFIG_PINCTRL_MT7620)		+= pinctrl-mt7620.o
+obj-$(CONFIG_PINCTRL_MT7621)		+= pinctrl-mt7621.o
+obj-$(CONFIG_PINCTRL_MT76X8)		+= pinctrl-mt76x8.o
+obj-$(CONFIG_PINCTRL_RT2880)		+= pinctrl-rt2880.o
+obj-$(CONFIG_PINCTRL_RT305X)		+= pinctrl-rt305x.o
+obj-$(CONFIG_PINCTRL_RT3883)		+= pinctrl-rt3883.o
+obj-$(CONFIG_PINCTRL_MT2701)		+= pinctrl-mt2701.o
+obj-$(CONFIG_PINCTRL_MT2712)		+= pinctrl-mt2712.o
+obj-$(CONFIG_PINCTRL_MT8135)		+= pinctrl-mt8135.o
+obj-$(CONFIG_PINCTRL_MT8127)		+= pinctrl-mt8127.o
+obj-$(CONFIG_PINCTRL_MT6765)		+= pinctrl-mt6765.o
+obj-$(CONFIG_PINCTRL_MT6779)		+= pinctrl-mt6779.o
+obj-$(CONFIG_PINCTRL_MT6795)		+= pinctrl-mt6795.o
+obj-$(CONFIG_PINCTRL_MT6797)		+= pinctrl-mt6797.o
+obj-$(CONFIG_PINCTRL_MT6878)		+= pinctrl-mt6878.o
+obj-$(CONFIG_PINCTRL_MT6893)		+= pinctrl-mt6893.o
+obj-$(CONFIG_PINCTRL_MT7622)		+= pinctrl-mt7622.o
+obj-$(CONFIG_PINCTRL_MT7623)		+= pinctrl-mt7623.o
+obj-$(CONFIG_PINCTRL_MT7629)		+= pinctrl-mt7629.o
+obj-$(CONFIG_PINCTRL_MT7981)		+= pinctrl-mt7981.o
+obj-$(CONFIG_PINCTRL_MT7986)		+= pinctrl-mt7986.o
+obj-$(CONFIG_PINCTRL_MT7988)		+= pinctrl-mt7988.o
+obj-$(CONFIG_PINCTRL_MT8167)		+= pinctrl-mt8167.o
+obj-$(CONFIG_PINCTRL_MT8173)		+= pinctrl-mt8173.o
+obj-$(CONFIG_PINCTRL_MT8183)		+= pinctrl-mt8183.o
+obj-$(CONFIG_PINCTRL_MT8186)		+= pinctrl-mt8186.o
+obj-$(CONFIG_PINCTRL_MT8188)		+= pinctrl-mt8188.o
+obj-$(CONFIG_PINCTRL_MT8189)            += pinctrl-mt8189.o
+obj-$(CONFIG_PINCTRL_MT8192)		+= pinctrl-mt8192.o
+obj-$(CONFIG_PINCTRL_MT8195)		+= pinctrl-mt8195.o
+obj-$(CONFIG_PINCTRL_MT8196)		+= pinctrl-mt8196.o
+obj-$(CONFIG_PINCTRL_MT8365)		+= pinctrl-mt8365.o
+obj-$(CONFIG_PINCTRL_MT8516)		+= pinctrl-mt8516.o
+obj-$(CONFIG_PINCTRL_MT6397)		+= pinctrl-mt6397.o