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 --- Documentation/ABI/testing/sysfs-class-net-phydev | 75 ++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-net-phydev (limited to 'Documentation/ABI/testing/sysfs-class-net-phydev') diff --git a/Documentation/ABI/testing/sysfs-class-net-phydev b/Documentation/ABI/testing/sysfs-class-net-phydev new file mode 100644 index 000000000..31615c59b --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-net-phydev @@ -0,0 +1,75 @@ +What: /sys/class/mdio_bus///attached_dev +Date: May 2017 +KernelVersion: 4.13 +Contact: netdev@vger.kernel.org +Description: + Symbolic link to the network device this PHY device is + attached to. + +What: /sys/class/mdio_bus///phy_has_fixups +Date: February 2014 +KernelVersion: 3.15 +Contact: netdev@vger.kernel.org +Description: + This attribute contains the boolean value whether a given PHY + device has had any "fixup" workaround running on it, encoded as + a boolean. This information is provided to help troubleshooting + PHY configurations. + +What: /sys/class/mdio_bus///phy_id +Date: November 2012 +KernelVersion: 3.8 +Contact: netdev@vger.kernel.org +Description: + This attribute contains the 32-bit PHY Identifier as reported + by the device during bus enumeration, encoded in hexadecimal. + This ID is used to match the device with the appropriate + driver. + +What: /sys/class/mdio_bus///c45_phy_ids/mmd_device_id +Date: June 2025 +KernelVersion: 6.17 +Contact: netdev@vger.kernel.org +Description: + This attribute contains the 32-bit PHY Identifier as reported + by the device during bus enumeration, encoded in hexadecimal. + These C45 IDs are used to match the device with the appropriate + driver. These files are invisible to the C22 device. + +What: /sys/class/mdio_bus///phy_interface +Date: February 2014 +KernelVersion: 3.15 +Contact: netdev@vger.kernel.org +Description: + This attribute contains the PHY interface as configured by the + Ethernet driver during bus enumeration, encoded in string. + This interface mode is used to configure the Ethernet MAC with the + appropriate mode for its data lines to the PHY hardware. + + Possible values are: + + (not available), mii, gmii, sgmii, tbi, rev-mii, + rmii, rgmii, rgmii-id, rgmii-rxid, rgmii-txid, rtbi, smii + xgmii, moca, qsgmii, trgmii, 1000base-x, 2500base-x, rxaui, + xaui, 10gbase-kr, unknown + +What: /sys/class/mdio_bus///phy_standalone +Date: May 2019 +KernelVersion: 5.3 +Contact: netdev@vger.kernel.org +Description: + Boolean value indicating whether the PHY device is used in + standalone mode, without a net_device associated, by PHYLINK. + Attribute created only when this is the case. + +What: /sys/class/mdio_bus///phy_dev_flags +Date: March 2021 +KernelVersion: 5.13 +Contact: netdev@vger.kernel.org +Description: + 32-bit hexadecimal number representing a bit mask of the + configuration bits passed from the consumer of the PHY + (Ethernet MAC, switch, etc.) to the PHY driver. The flags are + only used internally by the kernel and their placement are + not meant to be stable across kernel versions. This is intended + for facilitating the debugging of PHY drivers. -- cgit v1.3.1