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/package/buildtar | 110 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 110 insertions(+) create mode 100755 scripts/package/buildtar (limited to 'scripts/package/buildtar') diff --git a/scripts/package/buildtar b/scripts/package/buildtar new file mode 100755 index 000000000..cc87a473c --- /dev/null +++ b/scripts/package/buildtar @@ -0,0 +1,110 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +# +# buildtar 0.0.5 +# +# (C) 2004-2006 by Jan-Benedict Glaw +# +# This script is used to compile a tarball from the currently +# prepared kernel. Based upon the builddeb script from +# Wichert Akkerman . +# + +set -eu + +# +# Some variables and settings used throughout the script +# +tmpdir=$1 + +# +# Clean-up and re-create the temporary directory +# +rm -rf -- "${tmpdir}" +mkdir -p -- "${tmpdir}/boot" + + +# +# Try to install dtbs +# +if grep -q '^CONFIG_OF_EARLY_FLATTREE=y' include/config/auto.conf; then + # Only some architectures with OF support have this target + if [ -d "${srctree}/arch/${SRCARCH}/boot/dts" ]; then + $MAKE ARCH="${ARCH}" -f ${srctree}/Makefile INSTALL_DTBS_PATH="${tmpdir}/boot/dtbs/${KERNELRELEASE}" dtbs_install + fi +fi + + +# +# Install modules +# +make ARCH="${ARCH}" -f ${srctree}/Makefile INSTALL_MOD_PATH="${tmpdir}" modules_install + + +# +# Install basic kernel files +# +cp -v -- "${objtree}/System.map" "${tmpdir}/boot/System.map-${KERNELRELEASE}" +cp -v -- "${KCONFIG_CONFIG}" "${tmpdir}/boot/config-${KERNELRELEASE}" +cp -v -- "${objtree}/vmlinux" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}" + + +# +# Install arch-specific kernel image(s) +# +# Note: +# mips and arm64 copy the first image found. This may not produce the desired +# outcome because it may pick up a stale file remaining in the build tree. +# +case "${ARCH}" in + alpha) + cp -v -- "${objtree}/arch/alpha/boot/vmlinux.gz" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}" + ;; + parisc*) + cp -v -- "${KBUILD_IMAGE}" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}" + [ -f "${objtree}/lifimage" ] && cp -v -- "${objtree}/lifimage" "${tmpdir}/boot/lifimage-${KERNELRELEASE}" + ;; + mips) + # Please note the following code may copy a stale file. + if [ -f "${objtree}/arch/mips/boot/compressed/vmlinux.bin" ]; then + cp -v -- "${objtree}/arch/mips/boot/compressed/vmlinux.bin" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}" + elif [ -f "${objtree}/arch/mips/boot/compressed/vmlinux.ecoff" ]; then + cp -v -- "${objtree}/arch/mips/boot/compressed/vmlinux.ecoff" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}" + elif [ -f "${objtree}/arch/mips/boot/compressed/vmlinux.srec" ]; then + cp -v -- "${objtree}/arch/mips/boot/compressed/vmlinux.srec" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}" + elif [ -f "${objtree}/vmlinux.32" ]; then + cp -v -- "${objtree}/vmlinux.32" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}" + elif [ -f "${objtree}/vmlinux.64" ]; then + cp -v -- "${objtree}/vmlinux.64" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}" + elif [ -f "${objtree}/arch/mips/boot/vmlinux.bin" ]; then + cp -v -- "${objtree}/arch/mips/boot/vmlinux.bin" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}" + elif [ -f "${objtree}/arch/mips/boot/vmlinux.ecoff" ]; then + cp -v -- "${objtree}/arch/mips/boot/vmlinux.ecoff" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}" + elif [ -f "${objtree}/arch/mips/boot/vmlinux.srec" ]; then + cp -v -- "${objtree}/arch/mips/boot/vmlinux.srec" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}" + elif [ -f "${objtree}/vmlinux" ]; then + cp -v -- "${objtree}/vmlinux" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}" + fi + ;; + arm64) + # Please note the following code may copy a stale file. + for i in Image.bz2 Image.gz Image.lz4 Image.lzma Image.lzo vmlinuz.efi ; do + if [ -f "${objtree}/arch/arm64/boot/${i}" ] ; then + cp -v -- "${objtree}/arch/arm64/boot/${i}" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}" + break + fi + done + ;; + riscv) + case "${KBUILD_IMAGE##*/}" in + Image.*|vmlinuz.efi) + cp -v -- "${KBUILD_IMAGE}" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}";; + *) + cp -v -- "${KBUILD_IMAGE}" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}";; + esac + ;; + *) + cp -v -- "${KBUILD_IMAGE}" "${tmpdir}/boot/vmlinuz-${KERNELRELEASE}" + ;; +esac -- cgit v1.3.1