libnuma: make numa_police_memory() free of race

Resolves: bz1949860

Signed-off-by: Pingfan Liu <piliu@redhat.com>

0001-libnuma-make-numa_police_memory-free-of-race.patch

@@ -0,0 +1,35 @@
+From 93867c59b0bb29470873a427dc7f06ebaf305221 Mon Sep 17 00:00:00 2001
+From: Pingfan Liu <piliu@redhat.com>
+Date: Mon, 29 Mar 2021 17:33:06 +0800
+Subject: [PATCH] libnuma: make numa_police_memory() free of race
+
+When numa_police_memory() read-write to memory, it can risk the race of
+another thread write to the same area.
+
+Using atomic function to protect the read-write operation
+
+Signed-off-by: Pingfan Liu <piliu@redhat.com>
+---
+ libnuma.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/libnuma.c b/libnuma.c
+index f073c50..7b8290c 100644
+--- a/libnuma.c
++++ b/libnuma.c
+@@ -864,8 +864,10 @@ void numa_police_memory(void *mem, size_t size)
+ {
+ 	int pagesize = numa_pagesize_int();
+ 	unsigned long i;
+-	for (i = 0; i < size; i += pagesize)
+-        ((volatile char*)mem)[i] = ((volatile char*)mem)[i];
++	char *p = mem;
++	for (i = 0; i < size; i += pagesize, p += pagesize)
++		__atomic_and_fetch(p, 0xff, __ATOMIC_RELAXED);
++
+ }
+ 
+ make_internal_alias(numa_police_memory);
+-- 
+2.29.2
+

numactl.spec

@@ -13,6 +13,33 @@ BuildRequires:	libtool automake autoconf
 
 ExcludeArch: s390 %{arm}
 
+#START INSERT
+#
+# Patches 0 through 100 are meant for x86
+#
+
+#
+# Patches 101 through 200 are meant for x86_64
+#
+
+#
+# Patches 301 through 400 are meant for ppc64le
+#
+
+#
+# Patches 401 through 500 are meant for s390x
+#
+
+#
+# Patches 501 through 600 are meant for aarch64
+#
+
+#
+# Patches 601 onward are generic patches
+#
+Patch601: 0001-libnuma-make-numa_police_memory-free-of-race.patch
+
+
 %description
 Simple NUMA policy support. It consists of a numactl program to run
 other programs with a specific NUMA policy.
@@ -37,6 +64,9 @@ Provides development headers for numa library calls
 %prep
 %autosetup
 
+#patch
+#%patch601 -p1
+
 %build
 %configure --prefix=/usr --libdir=%{_libdir}
 # Using recipe to fix rpaths, from here: