SLAB: When using get_user on kernel pointers, enter KERNEL_DS.

diff --git a/mm/slab.c b/mm/slab.c
index 99b7559849f67da8c581495ee05cdc3b367d9543..53bf1aedfcc497dd181a4807a20b3a6923a26c6a 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -839,7 +839,10 @@ next:
        down(&cache_chain_sem);
        {
                struct list_head *p;
+               mm_segment_t old_fs;
 
+               old_fs = get_fs();
+               set_fs(KERNEL_DS);
                list_for_each(p, &cache_chain) {
                        kmem_cache_t *pc = list_entry(p, kmem_cache_t, next);
                        char tmp;
@@ -857,6 +860,7 @@ next:
                                BUG(); 
                        }       
                }
+               set_fs(old_fs);
        }
 
        /* There is no reason to lock our new cache before we
@@ -1965,8 +1969,13 @@ static int s_show(struct seq_file *m, void *p)
        name = cachep->name; 
        {
        char tmp; 
+       mm_segment_t old_fs;
+
+       old_fs = get_fs();
+       set_fs(KERNEL_DS);
        if (__get_user(tmp, name)) 
                name = "broken"; 
+       set_fs(old_fs);
        }       
 
        seq_printf(m, "%-17s %6lu %6lu %6u %4lu %4lu %4u",