diff options
| author | Alan Cox <alan@linux.intel.com> | 2012-07-26 14:47:11 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-08-09 08:22:36 -0700 |
| commit | 4e9cca830222266bc4d456d0ce7f13a376088e56 (patch) | |
| tree | 8eca15ad9621fd033e2a66e4c892233c5cf2b157 /security/smack | |
| parent | 69f699e6189772036175b3b7d362c82b0d944d4d (diff) | |
smack: off by one error
commit 3b9fc37280c521b086943f9aedda767f5bf3b2d3 upstream.
Consider the input case of a rule that consists entirely of non space
symbols followed by a \0. Say 64 + \0
In this case strlen(data) = 64
kzalloc of subject and object are 64 byte objects
sscanfdata, "%s %s %s", subject, ...)
will put 65 bytes into subject.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'security/smack')
| -rw-r--r-- | security/smack/smackfs.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 1810c9a4ed48..cb6d904e3f96 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -325,11 +325,11 @@ static int smk_parse_long_rule(const char *data, struct smack_rule *rule, int datalen; int rc = -1; - /* - * This is probably inefficient, but safe. - */ + /* This is inefficient */ datalen = strlen(data); - subject = kzalloc(datalen, GFP_KERNEL); + + /* Our first element can be 64 + \0 with no spaces */ + subject = kzalloc(datalen + 1, GFP_KERNEL); if (subject == NULL) return -1; object = kzalloc(datalen, GFP_KERNEL); |