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 --- drivers/pinctrl/tegra/Makefile | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 drivers/pinctrl/tegra/Makefile (limited to 'drivers/pinctrl/tegra/Makefile') diff --git a/drivers/pinctrl/tegra/Makefile b/drivers/pinctrl/tegra/Makefile new file mode 100644 index 000000000..71ade768b --- /dev/null +++ b/drivers/pinctrl/tegra/Makefile @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_PINCTRL_TEGRA) += pinctrl-tegra.o +obj-$(CONFIG_PINCTRL_TEGRA20) += pinctrl-tegra20.o +obj-$(CONFIG_PINCTRL_TEGRA30) += pinctrl-tegra30.o +obj-$(CONFIG_PINCTRL_TEGRA114) += pinctrl-tegra114.o +obj-$(CONFIG_PINCTRL_TEGRA124) += pinctrl-tegra124.o +obj-$(CONFIG_PINCTRL_TEGRA210) += pinctrl-tegra210.o +obj-$(CONFIG_PINCTRL_TEGRA186) += pinctrl-tegra186.o +obj-$(CONFIG_PINCTRL_TEGRA194) += pinctrl-tegra194.o +obj-$(CONFIG_PINCTRL_TEGRA234) += pinctrl-tegra234.o +obj-$(CONFIG_PINCTRL_TEGRA238) += pinctrl-tegra238.o +obj-$(CONFIG_PINCTRL_TEGRA264) += pinctrl-tegra264.o +obj-$(CONFIG_PINCTRL_TEGRA_XUSB) += pinctrl-tegra-xusb.o -- cgit v1.3.1