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, 102 insertions, 0 deletions

diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
new file mode 100644
index 000000000..de660ae94
--- /dev/null
+++ b/drivers/net/phy/Makefile
@@ -0,0 +1,102 @@
+# SPDX-License-Identifier: GPL-2.0
+# Makefile for Linux PHY drivers
+
+libphy-y			:= phy.o phy-c45.o phy-core.o phy_device.o \
+				   linkmode.o phy_link_topology.o \
+				   phy_caps.o mdio_bus_provider.o phy_port.o \
+				   mdio_device.o
+
+ifdef CONFIG_PHYLIB
+# built-in whenever PHYLIB is built-in or module
+obj-y				+= stubs.o
+endif
+
+libphy-$(CONFIG_SWPHY)		+= swphy.o
+libphy-$(CONFIG_LED_TRIGGER_PHY)	+= phy_led_triggers.o
+libphy-$(CONFIG_OPEN_ALLIANCE_HELPERS) += open_alliance_helpers.o
+
+obj-$(CONFIG_PHYLIB)		+= mdio_bus.o
+obj-$(CONFIG_PHYLINK)		+= phylink.o
+obj-$(CONFIG_PHYLIB)		+= libphy.o
+obj-$(CONFIG_PHYLIB)		+= mdio_devres.o
+obj-$(CONFIG_PHY_PACKAGE)	+= phy_package.o
+
+obj-$(CONFIG_NETWORK_PHY_TIMESTAMPING) += mii_timestamper.o
+
+obj-$(CONFIG_SFP)		+= sfp.o
+sfp-obj-$(CONFIG_SFP)		+= sfp-bus.o
+obj-y				+= $(sfp-obj-y) $(sfp-obj-m)
+
+obj-$(CONFIG_ADIN_PHY)		+= adin.o
+obj-$(CONFIG_ADIN1100_PHY)	+= adin1100.o
+obj-$(CONFIG_AIR_AN8801_PHY)	+= air_an8801.o
+obj-$(CONFIG_AIR_EN8811H_PHY)   += air_en8811h.o
+obj-$(CONFIG_AIR_NET_PHYLIB)	+= air_phy_lib.o
+obj-$(CONFIG_AMD_PHY)		+= amd.o
+obj-$(CONFIG_AMCC_QT2025_PHY)	+= qt2025.o
+obj-$(CONFIG_AQUANTIA_PHY)	+= aquantia/
+obj-$(CONFIG_AS21XXX_PHY)	+= as21xxx.o
+ifdef CONFIG_AX88796B_RUST_PHY
+  obj-$(CONFIG_AX88796B_PHY)	+= ax88796b_rust.o
+else
+  obj-$(CONFIG_AX88796B_PHY)	+= ax88796b.o
+endif
+obj-$(CONFIG_BCM54140_PHY)	+= bcm54140.o
+obj-$(CONFIG_BCM63XX_PHY)	+= bcm63xx.o
+obj-$(CONFIG_BCM7XXX_PHY)	+= bcm7xxx.o
+obj-$(CONFIG_BCM84881_PHY)	+= bcm84881.o
+obj-$(CONFIG_BCM87XX_PHY)	+= bcm87xx.o
+obj-$(CONFIG_BCM_CYGNUS_PHY)	+= bcm-cygnus.o
+obj-$(CONFIG_BCM_NET_PHYLIB)	+= bcm-phy-lib.o
+obj-$(CONFIG_BCM_NET_PHYPTP)	+= bcm-phy-ptp.o
+obj-$(CONFIG_BROADCOM_PHY)	+= broadcom.o
+obj-$(CONFIG_CICADA_PHY)	+= cicada.o
+obj-$(CONFIG_CORTINA_PHY)	+= cortina.o
+obj-$(CONFIG_DAVICOM_PHY)	+= davicom.o
+obj-$(CONFIG_DP83640_PHY)	+= dp83640.o
+obj-$(CONFIG_DP83822_PHY)	+= dp83822.o
+obj-$(CONFIG_DP83848_PHY)	+= dp83848.o
+obj-$(CONFIG_DP83867_PHY)	+= dp83867.o
+obj-$(CONFIG_DP83869_PHY)	+= dp83869.o
+obj-$(CONFIG_DP83TC811_PHY)	+= dp83tc811.o
+obj-$(CONFIG_DP83TD510_PHY)	+= dp83td510.o
+obj-$(CONFIG_DP83TG720_PHY)	+= dp83tg720.o
+obj-$(CONFIG_FIXED_PHY)		+= fixed_phy.o
+obj-$(CONFIG_ICPLUS_PHY)	+= icplus.o
+obj-$(CONFIG_INTEL_XWAY_PHY)	+= intel-xway.o
+obj-$(CONFIG_LSI_ET1011C_PHY)	+= et1011c.o
+obj-$(CONFIG_LXT_PHY)		+= lxt.o
+obj-$(CONFIG_MARVELL_10G_PHY)	+= marvell10g.o
+obj-$(CONFIG_MARVELL_PHY)	+= marvell.o
+obj-$(CONFIG_MARVELL_88Q2XXX_PHY)	+= marvell-88q2xxx.o
+obj-$(CONFIG_MARVELL_88X2222_PHY)	+= marvell-88x2222.o
+obj-$(CONFIG_MAXLINEAR_GPHY)	+= mxl-gpy.o
+obj-$(CONFIG_MAXLINEAR_86110_PHY)	+= mxl-86110.o
+obj-y				+= mediatek/
+obj-$(CONFIG_MESON_GXL_PHY)	+= meson-gxl.o
+obj-$(CONFIG_MICREL_PHY)	+= micrel.o
+obj-$(CONFIG_MICROCHIP_PHY)	+= microchip.o
+obj-$(CONFIG_MICROCHIP_PHY_RDS_PTP)	+= microchip_rds_ptp.o
+obj-$(CONFIG_MICROCHIP_T1_PHY)	+= microchip_t1.o
+obj-$(CONFIG_MICROCHIP_T1S_PHY) += microchip_t1s.o
+obj-$(CONFIG_MICROSEMI_PHY)	+= mscc/
+obj-$(CONFIG_MOTORCOMM_PHY)	+= motorcomm.o
+obj-$(CONFIG_NATIONAL_PHY)	+= national.o
+obj-$(CONFIG_NCN26000_PHY)	+= ncn26000.o
+nxp-c45-tja-objs		+= nxp-c45-tja11xx.o
+ifdef CONFIG_MACSEC
+nxp-c45-tja-objs		+= nxp-c45-tja11xx-macsec.o
+endif
+obj-$(CONFIG_NXP_C45_TJA11XX_PHY)	+= nxp-c45-tja.o
+obj-$(CONFIG_NXP_CBTX_PHY)	+= nxp-cbtx.o
+obj-$(CONFIG_NXP_TJA11XX_PHY)	+= nxp-tja11xx.o
+obj-y				+= qcom/
+obj-$(CONFIG_QSEMI_PHY)		+= qsemi.o
+obj-$(CONFIG_REALTEK_PHY)	+= realtek/
+obj-$(CONFIG_RENESAS_PHY)	+= uPD60620.o
+obj-$(CONFIG_ROCKCHIP_PHY)	+= rockchip.o
+obj-$(CONFIG_SMSC_PHY)		+= smsc.o
+obj-$(CONFIG_STE10XP)		+= ste10Xp.o
+obj-$(CONFIG_TERANETICS_PHY)	+= teranetics.o
+obj-$(CONFIG_VITESSE_PHY)	+= vitesse.o
+obj-$(CONFIG_XILINX_GMII2RGMII) += xilinx_gmii2rgmii.o