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 --- security/selinux/Makefile | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 security/selinux/Makefile (limited to 'security/selinux/Makefile') diff --git a/security/selinux/Makefile b/security/selinux/Makefile new file mode 100644 index 000000000..72d3baf79 --- /dev/null +++ b/security/selinux/Makefile @@ -0,0 +1,44 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for building the SELinux module as part of the kernel tree. +# + +# NOTE: There are a number of improvements that can be made to this Makefile +# once the kernel requires make v4.3 or greater; the most important feature +# lacking in older versions of make is support for grouped targets. These +# improvements are noted inline in the Makefile below ... + +obj-$(CONFIG_SECURITY_SELINUX) := selinux.o + +ccflags-y := -I$(srctree)/security/selinux -I$(srctree)/security/selinux/include + +ccflags-$(CONFIG_SECURITY_SELINUX_DEBUG) += -DDEBUG + +selinux-y := avc.o hooks.o selinuxfs.o netlink.o nlmsgtab.o netif.o \ + netnode.o netport.o status.o initcalls.o \ + ss/ebitmap.o ss/hashtab.o ss/symtab.o ss/sidtab.o ss/avtab.o \ + ss/policydb.o ss/services.o ss/conditional.o ss/mls.o ss/context.o + +selinux-$(CONFIG_SECURITY_NETWORK_XFRM) += xfrm.o +selinux-$(CONFIG_NETLABEL) += netlabel.o +selinux-$(CONFIG_SECURITY_INFINIBAND) += ibpkey.o +selinux-$(CONFIG_IMA) += ima.o + +genhdrs := flask.h av_permissions.h + +# see the note above, replace the dependency rule with the one below: +# $(addprefix $(obj)/,$(selinux-y)): $(addprefix $(obj)/,$(genhdrs)) +$(addprefix $(obj)/,$(selinux-y)): $(obj)/flask.h + +quiet_cmd_genhdrs = GEN $(addprefix $(obj)/,$(genhdrs)) + cmd_genhdrs = $< $(addprefix $(obj)/,$(genhdrs)) + +targets += $(genhdrs) + +# see the note above, replace the 'flask.h' rule with the line below: +# $(addprefix $(obj)/,$(genhdrs)) &: $(obj)/genheaders FORCE +$(obj)/flask.h: $(obj)/genheaders FORCE + $(call if_changed,genhdrs) + +hostprogs := genheaders +HOST_EXTRACFLAGS += -I$(srctree)/security/selinux/include -- cgit v1.3.1