audit: change decimal constant to macro for invalid uid

SFR reported this 2013-05-15:

> After merging the final tree, today's linux-next build (i386 defconfig)
> produced this warning:
>
> kernel/auditfilter.c: In function 'audit_data_to_entry':
> kernel/auditfilter.c:426:3: warning: this decimal constant is unsigned only
> in ISO C90 [enabled by default]
>
> Introduced by commit 780a7654cee8 ("audit: Make testing for a valid
> loginuid explicit") from Linus' tree.

Replace this decimal constant in the code with a macro to make it more readable
(add to the unsigned cast to quiet the warning).

Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>

2 files changed, 3 insertions, 1 deletions

diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 5dfcd85037e2..c1f0fced3ede 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -380,6 +380,8 @@ struct audit_tty_status {
         __u32           log_passwd;     /* 1 = enabled, 0 = disabled */
 };
 
+#define AUDIT_UID_UNSET (unsigned int)-1
+
 /* audit_rule_data supports filter rules with both integer and string
  * fields.  It corresponds with AUDIT_ADD_RULE, AUDIT_DEL_RULE and
  * AUDIT_LIST_RULES requests.
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index f7aee8be7fb2..8a344cebd8bf 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -423,7 +423,7 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
                 f->lsm_rule = NULL;
 
                 /* Support legacy tests for a valid loginuid */
-                if ((f->type == AUDIT_LOGINUID) && (f->val == ~0U)) {
+                if ((f->type == AUDIT_LOGINUID) && (f->val == AUDIT_UID_UNSET)) {
                         f->type = AUDIT_LOGINUID_SET;
                         f->val = 0;
                 }