[PATCH v2 3/3] ima: show rules with IMA_INMASK correctly

[Roberto Sassu]

Show the '^' character when a policy rule has flag IMA_INMASK.

Fixes: 80eae209d63ac ("IMA: allow reading back the current IMA policy")
Signed-off-by: Roberto Sassu <roberto.sa...@huawei.com>
Cc: sta...@vger.kernel.org
---
 security/integrity/ima/ima_policy.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/security/integrity/ima/ima_policy.c 
b/security/integrity/ima/ima_policy.c
index e0cc323f948f..ae4034f041c4 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1146,10 +1146,10 @@ enum {
 };
 
 static const char *const mask_tokens[] = {
-       "MAY_EXEC",
-       "MAY_WRITE",
-       "MAY_READ",
-       "MAY_APPEND"
+       "^MAY_EXEC",
+       "^MAY_WRITE",
+       "^MAY_READ",
+       "^MAY_APPEND"
 };
 
 #define __ima_hook_stringify(str)      (#str),
@@ -1209,6 +1209,7 @@ int ima_policy_show(struct seq_file *m, void *v)
        struct ima_rule_entry *entry = v;
        int i;
        char tbuf[64] = {0,};
+       int offset = 0;
 
        rcu_read_lock();
 
@@ -1232,15 +1233,17 @@ int ima_policy_show(struct seq_file *m, void *v)
        if (entry->flags & IMA_FUNC)
                policy_func_show(m, entry->func);
 
-       if (entry->flags & IMA_MASK) {
+       if ((entry->flags & IMA_MASK) || (entry->flags & IMA_INMASK)) {
+               if (entry->flags & IMA_MASK)
+                       offset = 1;
                if (entry->mask & MAY_EXEC)
-                       seq_printf(m, pt(Opt_mask), mt(mask_exec));
+                       seq_printf(m, pt(Opt_mask), mt(mask_exec) + offset);
                if (entry->mask & MAY_WRITE)
-                       seq_printf(m, pt(Opt_mask), mt(mask_write));
+                       seq_printf(m, pt(Opt_mask), mt(mask_write) + offset);
                if (entry->mask & MAY_READ)
-                       seq_printf(m, pt(Opt_mask), mt(mask_read));
+                       seq_printf(m, pt(Opt_mask), mt(mask_read) + offset);
                if (entry->mask & MAY_APPEND)
-                       seq_printf(m, pt(Opt_mask), mt(mask_append));
+                       seq_printf(m, pt(Opt_mask), mt(mask_append) + offset);
                seq_puts(m, " ");
        }
 
-- 
2.17.1