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, 71 insertions, 0 deletions

diff --git a/net/mac80211/Makefile b/net/mac80211/Makefile
new file mode 100644
index 000000000..36f1e3e22
--- /dev/null
+++ b/net/mac80211/Makefile
@@ -0,0 +1,71 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_MAC80211) += mac80211.o
+
+# mac80211 objects
+mac80211-y := \
+	main.o status.o \
+	driver-ops.o \
+	sta_info.o \
+	wep.o \
+	aead_api.o \
+	wpa.o \
+	scan.o offchannel.o \
+	ht.o agg-tx.o agg-rx.o \
+	vht.o \
+	he.o \
+	s1g.o \
+	ibss.o \
+	iface.o \
+	link.o \
+	rate.o \
+	tkip.o \
+	aes_cmac.o \
+	aes_gmac.o \
+	fils_aead.o \
+	cfg.o \
+	ethtool.o \
+	rx.o \
+	spectmgmt.o \
+	tx.o \
+	key.o \
+	util.o parse.o \
+	wme.o \
+	chan.o ap.o \
+	trace.o mlme.o \
+	tdls.o \
+	ocb.o \
+	airtime.o \
+	eht.o uhr.o nan.o
+
+mac80211-$(CONFIG_MAC80211_LEDS) += led.o
+mac80211-$(CONFIG_MAC80211_DEBUGFS) += \
+	debugfs.o \
+	debugfs_sta.o \
+	debugfs_netdev.o \
+	debugfs_key.o
+
+mac80211-$(CONFIG_MAC80211_MESH) += \
+	mesh.o \
+	mesh_pathtbl.o \
+	mesh_plink.o \
+	mesh_hwmp.o \
+	mesh_sync.o \
+	mesh_ps.o
+
+mac80211-$(CONFIG_PM) += pm.o
+
+CFLAGS_trace.o := -I$(src)
+
+rc80211_minstrel-y := \
+	rc80211_minstrel_ht.o
+
+rc80211_minstrel-$(CONFIG_MAC80211_DEBUGFS) += \
+	rc80211_minstrel_ht_debugfs.o
+
+mac80211-$(CONFIG_MAC80211_RC_MINSTREL) += $(rc80211_minstrel-y)
+
+obj-y += tests/
+
+mac80211-y += wbrf.o
+
+ccflags-y += -DDEBUG