[RFC PATCH 06/11] drivers/char/mem.c: Make null/zero/full/random/urandom available to user namespaces

[Seth Forshee]

Signed-off-by: Seth Forshee <seth.fors...@canonical.com>
---
 drivers/char/mem.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 917403fe10da..edd71ebf5025 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -811,21 +811,22 @@ static const struct memdev {
        umode_t mode;
        const struct file_operations *fops;
        struct backing_dev_info *dev_info;
+       bool global;
 } devlist[] = {
-        [1] = { "mem", 0, &mem_fops, &directly_mappable_cdev_bdi },
+        [1] = { "mem", 0, &mem_fops, &directly_mappable_cdev_bdi, false },
 #ifdef CONFIG_DEVKMEM
-        [2] = { "kmem", 0, &kmem_fops, &directly_mappable_cdev_bdi },
+        [2] = { "kmem", 0, &kmem_fops, &directly_mappable_cdev_bdi, false },
 #endif
-        [3] = { "null", 0666, &null_fops, NULL },
+        [3] = { "null", 0666, &null_fops, NULL, true },
 #ifdef CONFIG_DEVPORT
-        [4] = { "port", 0, &port_fops, NULL },
+        [4] = { "port", 0, &port_fops, NULL, false },
 #endif
-        [5] = { "zero", 0666, &zero_fops, &zero_bdi },
-        [7] = { "full", 0666, &full_fops, NULL },
-        [8] = { "random", 0666, &random_fops, NULL },
-        [9] = { "urandom", 0666, &urandom_fops, NULL },
+        [5] = { "zero", 0666, &zero_fops, &zero_bdi, true },
+        [7] = { "full", 0666, &full_fops, NULL, true },
+        [8] = { "random", 0666, &random_fops, NULL, true },
+        [9] = { "urandom", 0666, &urandom_fops, NULL, true },
 #ifdef CONFIG_PRINTK
-       [11] = { "kmsg", 0644, &kmsg_fops, NULL },
+       [11] = { "kmsg", 0644, &kmsg_fops, NULL, false },
 #endif
 };
 
@@ -897,8 +898,13 @@ static int __init chr_dev_init(void)
                if ((minor == DEVPORT_MINOR) && !arch_has_dev_port())
                        continue;
 
-               device_create(mem_class, NULL, MKDEV(MEM_MAJOR, minor),
-                             NULL, devlist[minor].name);
+               if (devlist[minor].global)
+                       device_create_global(mem_class, NULL,
+                                            MKDEV(MEM_MAJOR, minor), NULL,
+                                            devlist[minor].name);
+               else
+                       device_create(mem_class, NULL, MKDEV(MEM_MAJOR, minor),
+                                     NULL, devlist[minor].name);
        }
 
        return tty_init();
-- 
1.9.1

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