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, 32 insertions, 0 deletions

diff --git a/sound/hda/codecs/Makefile b/sound/hda/codecs/Makefile
new file mode 100644
index 000000000..88d2f8a79
--- /dev/null
+++ b/sound/hda/codecs/Makefile
@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: GPL-2.0
+subdir-ccflags-y += -I$(src)/../common
+
+snd-hda-codec-generic-y :=	generic.o
+snd-hda-codec-cmedia-y :=	cmedia.o
+snd-hda-codec-cm9825-y :=	cm9825.o
+snd-hda-codec-analog-y :=	analog.o
+snd-hda-codec-ca0110-y :=	ca0110.o
+snd-hda-codec-ca0132-y :=	ca0132.o
+snd-hda-codec-conexant-y :=	conexant.o
+snd-hda-codec-idt-y :=		sigmatel.o
+snd-hda-codec-senarytech-y :=	senarytech.o
+snd-hda-codec-si3054-y :=	si3054.o
+snd-hda-codec-via-y :=		via.o
+
+obj-y += cirrus/
+obj-y += hdmi/
+obj-y += realtek/
+obj-y += side-codecs/
+
+# codec drivers
+obj-$(CONFIG_SND_HDA_GENERIC) += snd-hda-codec-generic.o
+obj-$(CONFIG_SND_HDA_CODEC_CMEDIA) += snd-hda-codec-cmedia.o
+obj-$(CONFIG_SND_HDA_CODEC_CM9825) += snd-hda-codec-cm9825.o
+obj-$(CONFIG_SND_HDA_CODEC_ANALOG) += snd-hda-codec-analog.o
+obj-$(CONFIG_SND_HDA_CODEC_CA0110) += snd-hda-codec-ca0110.o
+obj-$(CONFIG_SND_HDA_CODEC_CA0132) += snd-hda-codec-ca0132.o
+obj-$(CONFIG_SND_HDA_CODEC_CONEXANT) += snd-hda-codec-conexant.o
+obj-$(CONFIG_SND_HDA_CODEC_SIGMATEL) += snd-hda-codec-idt.o
+obj-$(CONFIG_SND_HDA_CODEC_SENARYTECH) += snd-hda-codec-senarytech.o
+obj-$(CONFIG_SND_HDA_CODEC_SI3054) += snd-hda-codec-si3054.o
+obj-$(CONFIG_SND_HDA_CODEC_VIA) += snd-hda-codec-via.o