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 --- arch/mips/Kbuild.platforms | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 arch/mips/Kbuild.platforms (limited to 'arch/mips/Kbuild.platforms') diff --git a/arch/mips/Kbuild.platforms b/arch/mips/Kbuild.platforms new file mode 100644 index 000000000..41a00fa86 --- /dev/null +++ b/arch/mips/Kbuild.platforms @@ -0,0 +1,38 @@ +# SPDX-License-Identifier: GPL-2.0 +# All platforms listed in alphabetic order + +platform-$(CONFIG_MIPS_ALCHEMY) += alchemy/ +platform-$(CONFIG_ATH25) += ath25/ +platform-$(CONFIG_ATH79) += ath79/ +platform-$(CONFIG_BCM47XX) += bcm47xx/ +platform-$(CONFIG_BCM63XX) += bcm63xx/ +platform-$(CONFIG_BMIPS_GENERIC) += bmips/ +platform-$(CONFIG_CAVIUM_OCTEON_SOC) += cavium-octeon/ +platform-$(CONFIG_EYEQ) += mobileye/ +platform-$(CONFIG_MIPS_COBALT) += cobalt/ +platform-$(CONFIG_MACH_DECSTATION) += dec/ +platform-$(CONFIG_ECONET) += econet/ +platform-$(CONFIG_MIPS_GENERIC) += generic/ +platform-$(CONFIG_MACH_JAZZ) += jazz/ +platform-$(CONFIG_LANTIQ) += lantiq/ +platform-$(CONFIG_MACH_LOONGSON2EF) += loongson2ef/ +platform-$(CONFIG_MACH_LOONGSON32) += loongson32/ +platform-$(CONFIG_MACH_LOONGSON64) += loongson64/ +platform-$(CONFIG_MIPS_MALTA) += mti-malta/ +platform-$(CONFIG_MACH_NINTENDO64) += n64/ +platform-$(CONFIG_PIC32MZDA) += pic32/ +platform-$(CONFIG_RALINK) += ralink/ +platform-$(CONFIG_MIKROTIK_RB532) += rb532/ +platform-$(CONFIG_SGI_IP22) += sgi-ip22/ +platform-$(CONFIG_SGI_IP27) += sgi-ip27/ +platform-$(CONFIG_SGI_IP28) += sgi-ip22/ +platform-$(CONFIG_SGI_IP30) += sgi-ip30/ +platform-$(CONFIG_SGI_IP32) += sgi-ip32/ +platform-$(CONFIG_SIBYTE_BCM112X) += sibyte/ +platform-$(CONFIG_SIBYTE_SB1250) += sibyte/ +platform-$(CONFIG_SIBYTE_BCM1x80) += sibyte/ +platform-$(CONFIG_SNI_RM) += sni/ +platform-$(CONFIG_MACH_TX49XX) += txx9/ + +# include the platform specific files +include $(patsubst %/, $(srctree)/arch/mips/%/Platform, $(platform-y)) -- cgit v1.3.1