mm, mempolicy: make mpol_to_str robust and always succeed

mpol_to_str() should not fail.  Currently, it either fails because the
string buffer is too small or because a string hasn't been defined for a
mempolicy mode.

If a new mempolicy mode is introduced and no string is defined for it,
just warn and return "unknown".

If the buffer is too small, just truncate the string and return, the same
behavior as snprintf().

This also fixes a bug where there was no NULL-byte termination when doing
*p++ = '=' and *p++ ':' and maxlen has been reached.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Chen Gang <gang.chen@asianux.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 390bdab01c3c782cc14b55c6d1ef35ebddcc4197..9f1369fe0afbfc10524636cb6c67bf4f52b8f3b5 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1387,8 +1387,8 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
        struct mm_struct *mm = vma->vm_mm;
        struct mm_walk walk = {};
        struct mempolicy *pol;
-       int n;
-       char buffer[50];
+       char buffer[64];
+       int nid;
 
        if (!mm)
                return 0;
@@ -1404,10 +1404,8 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
        walk.mm = mm;
 
        pol = get_vma_policy(task, vma, vma->vm_start);
-       n = mpol_to_str(buffer, sizeof(buffer), pol);
+       mpol_to_str(buffer, sizeof(buffer), pol);
        mpol_cond_put(pol);
-       if (n < 0)
-               return n;
 
        seq_printf(m, "%08lx %s", vma->vm_start, buffer);
 
@@ -1460,9 +1458,9 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
        if (md->writeback)
                seq_printf(m, " writeback=%lu", md->writeback);
 
-       for_each_node_state(n, N_MEMORY)
-               if (md->node[n])
-                       seq_printf(m, " N%d=%lu", n, md->node[n]);
+       for_each_node_state(nid, N_MEMORY)
+               if (md->node[nid])
+                       seq_printf(m, " N%d=%lu", nid, md->node[nid]);
 out:
        seq_putc(m, '\n');
 

diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index da6716b9e3fea8148f45f57ac556367b547f839f..98a5ebe8411c501329cf42e12cf8f88897cffeec 100644 (file)
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -168,7 +168,7 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
 extern int mpol_parse_str(char *str, struct mempolicy **mpol);
 #endif
 
-extern int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol);
+extern void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol);
 
 /* Check if a vma is migratable */
 static inline int vma_migratable(struct vm_area_struct *vma)
@@ -306,9 +306,8 @@ static inline int mpol_parse_str(char *str, struct mempolicy **mpol)
 }
 #endif
 
-static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
+static inline void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
 {
-       return 0;
 }
 
 static inline int mpol_misplaced(struct page *page, struct vm_area_struct *vma,

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 04729647f359c7c1fa3a91058cc1044c0db2df8d..e271aeb833865560c07ef241fe0637ab74856a23 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2840,62 +2840,45 @@ out:
  * @maxlen:  length of @buffer
  * @pol:  pointer to mempolicy to be formatted
  *
- * Convert a mempolicy into a string.
- * Returns the number of characters in buffer (if positive)
- * or an error (negative)
+ * Convert @pol into a string.  If @buffer is too short, truncate the string.
+ * Recommend a @maxlen of at least 32 for the longest mode, "interleave", the
+ * longest flag, "relative", and to display at least a few node ids.
  */
-int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
+void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
 {
        char *p = buffer;
-       int l;
-       nodemask_t nodes;
-       unsigned short mode;
-       unsigned short flags = pol ? pol->flags : 0;
-
-       /*
-        * Sanity check:  room for longest mode, flag and some nodes
-        */
-       VM_BUG_ON(maxlen < strlen("interleave") + strlen("relative") + 16);
+       nodemask_t nodes = NODE_MASK_NONE;
+       unsigned short mode = MPOL_DEFAULT;
+       unsigned short flags = 0;
 
-       if (!pol || pol == &default_policy)
-               mode = MPOL_DEFAULT;
-       else
+       if (pol && pol != &default_policy) {
                mode = pol->mode;
+               flags = pol->flags;
+       }
 
        switch (mode) {
        case MPOL_DEFAULT:
-               nodes_clear(nodes);
                break;
-
        case MPOL_PREFERRED:
-               nodes_clear(nodes);
                if (flags & MPOL_F_LOCAL)
                        mode = MPOL_LOCAL;
                else
                        node_set(pol->v.preferred_node, nodes);
                break;
-
        case MPOL_BIND:
-               /* Fall through */
        case MPOL_INTERLEAVE:
                nodes = pol->v.nodes;
                break;
-
        default:
-               return -EINVAL;
+               WARN_ON_ONCE(1);
+               snprintf(p, maxlen, "unknown");
+               return;
        }
 
-       l = strlen(policy_modes[mode]);
-       if (buffer + maxlen < p + l + 1)
-               return -ENOSPC;
-
-       strcpy(p, policy_modes[mode]);
-       p += l;
+       p += snprintf(p, maxlen, policy_modes[mode]);
 
        if (flags & MPOL_MODE_FLAGS) {
-               if (buffer + maxlen < p + 2)
-                       return -ENOSPC;
-               *p++ = '=';
+               p += snprintf(p, buffer + maxlen - p, "=");
 
                /*
                 * Currently, the only defined flags are mutually exclusive
@@ -2907,10 +2890,7 @@ int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
        }
 
        if (!nodes_empty(nodes)) {
-               if (buffer + maxlen < p + 2)
-                       return -ENOSPC;
-               *p++ = ':';
+               p += snprintf(p, buffer + maxlen - p, ":");
                p += nodelist_scnprintf(p, buffer + maxlen - p, nodes);
        }
-       return p - buffer;
 }