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 --- scripts/kconfig/qconf-cfg.sh | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100755 scripts/kconfig/qconf-cfg.sh (limited to 'scripts/kconfig/qconf-cfg.sh') diff --git a/scripts/kconfig/qconf-cfg.sh b/scripts/kconfig/qconf-cfg.sh new file mode 100755 index 000000000..bb2df6636 --- /dev/null +++ b/scripts/kconfig/qconf-cfg.sh @@ -0,0 +1,42 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +set -eu + +cflags=$1 +libs=$2 +bin=$3 + +PKG5="Qt5Core Qt5Gui Qt5Widgets" +PKG6="Qt6Core Qt6Gui Qt6Widgets" + +if [ -z "$(command -v ${HOSTPKG_CONFIG})" ]; then + echo >&2 "*" + echo >&2 "* 'make xconfig' requires '${HOSTPKG_CONFIG}'. Please install it." + echo >&2 "*" + exit 1 +fi + +if ${HOSTPKG_CONFIG} --exists $PKG6; then + ${HOSTPKG_CONFIG} --cflags ${PKG6} > ${cflags} + # Qt6 requires C++17. + echo -std=c++17 >> ${cflags} + ${HOSTPKG_CONFIG} --libs ${PKG6} > ${libs} + ${HOSTPKG_CONFIG} --variable=libexecdir Qt6Core > ${bin} + exit 0 +fi + +if ${HOSTPKG_CONFIG} --exists $PKG5; then + ${HOSTPKG_CONFIG} --cflags ${PKG5} > ${cflags} + ${HOSTPKG_CONFIG} --libs ${PKG5} > ${libs} + ${HOSTPKG_CONFIG} --variable=host_bins Qt5Core > ${bin} + exit 0 +fi + +echo >&2 "*" +echo >&2 "* Could not find Qt6 or Qt5 via ${HOSTPKG_CONFIG}." +echo >&2 "* Please install Qt6 or Qt5 and make sure it's in PKG_CONFIG_PATH" +echo >&2 "* You need $PKG6 for Qt6" +echo >&2 "* You need $PKG5 for Qt5" +echo >&2 "*" +exit 1 -- cgit v1.3.1