openrisc: fix arbitrary kernel memory access via or1k_atomic syscallgrafted

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 <ali@iusegentoo.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/arch/powerpc/Kbuild b/arch/powerpc/Kbuild
new file mode 100644
index 000000000..b010ccb07
--- /dev/null
+++ b/arch/powerpc/Kbuild
@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: GPL-2.0
+subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror -Wa,--fatal-warnings
+subdir-asflags-$(CONFIG_PPC_WERROR) := -Wa,--fatal-warnings
+
+obj-y += kernel/
+obj-y += mm/
+obj-y += lib/
+obj-y += sysdev/
+obj-y += platforms/
+obj-y += math-emu/
+obj-y += crypto/
+obj-y += net/
+
+obj-$(CONFIG_XMON) += xmon/
+obj-$(CONFIG_KVM)  += kvm/
+
+obj-$(CONFIG_PERF_EVENTS) += perf/
+obj-$(CONFIG_KEXEC_CORE)  += kexec/
+obj-$(CONFIG_KEXEC_FILE)  += purgatory/
+
+# for cleaning
+subdir- += boot tools