ima: fix showing large 'violations' or 'runtime_measurements_count'

commit 1e4c8dafbb6bf72fb5eca035b861e39c5896c2b7 upstream.

The 12 character temporary buffer is not necessarily long enough to hold
a 'long' value.  Increase it.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index ad491c51e8339c8f497b218c7b007b7c12a98ce4..2c4e83f6409e3f3ff4fd2fe1be98334addddbd41 100644 (file)
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -39,14 +39,14 @@ static int __init default_canonical_fmt_setup(char *str)
 __setup("ima_canonical_fmt", default_canonical_fmt_setup);
 
 static int valid_policy = 1;
-#define TMPBUFLEN 12
+
 static ssize_t ima_show_htable_value(char __user *buf, size_t count,
                                     loff_t *ppos, atomic_long_t *val)
 {
-       char tmpbuf[TMPBUFLEN];
+       char tmpbuf[32];        /* greater than largest 'long' string value */
        ssize_t len;
 
-       len = scnprintf(tmpbuf, TMPBUFLEN, "%li\n", atomic_long_read(val));
+       len = scnprintf(tmpbuf, sizeof(tmpbuf), "%li\n", atomic_long_read(val));
        return simple_read_from_buffer(buf, count, ppos, tmpbuf, len);
 }