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audit: Convert int limit uses to u32

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The equivalent uapi struct uses __u32 so make the kernel
uses u32 too.

This can prevent some oddities where the limit is
logged/emitted as a negative value.

Convert kstrtol to kstrtouint to disallow negative values.

Signed-off-by: Joe Perches <joe@perches.com>
[eparis: do not remove static from audit_default declaration]
This commit is contained in:
Joe Perches 2014-01-14 10:33:13 -08:00 committed by Eric Paris
parent d957f7b726
commit 3e1d0bb622
3 changed files with 27 additions and 26 deletions
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2
include/linux/audit.h
View file

@ -465,7 +465,7 @@ extern int audit_rule_change(int type, __u32 portid, int seq,
void *data, size_t datasz);
extern int audit_list_rules_send(__u32 portid, int seq);
extern int audit_enabled;
extern u32 audit_enabled;
#else /* CONFIG_AUDIT */
static inline __printf(4, 5)
void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,

49
kernel/audit.c
View file

@ -79,16 +79,16 @@ static int audit_initialized;
#define AUDIT_OFF 0
#define AUDIT_ON 1
#define AUDIT_LOCKED 2
int audit_enabled;
int audit_ever_enabled;
u32 audit_enabled;
u32 audit_ever_enabled;
EXPORT_SYMBOL_GPL(audit_enabled);
/* Default state when kernel boots without any parameters. */
static int audit_default;
static u32 audit_default;
/* If auditing cannot proceed, audit_failure selects what happens. */
static int audit_failure = AUDIT_FAIL_PRINTK;
static u32 audit_failure = AUDIT_FAIL_PRINTK;
/*
* If audit records are to be written to the netlink socket, audit_pid
@ -101,14 +101,14 @@ static __u32 audit_nlk_portid;
/* If audit_rate_limit is non-zero, limit the rate of sending audit records
* to that number per second. This prevents DoS attacks, but results in
* audit records being dropped. */
static int audit_rate_limit;
static u32 audit_rate_limit;
/* Number of outstanding audit_buffers allowed.
* When set to zero, this means unlimited. */
static int audit_backlog_limit = 64;
static u32 audit_backlog_limit = 64;
#define AUDIT_BACKLOG_WAIT_TIME (60 * HZ)
static int audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
static int audit_backlog_wait_overflow = 0;
static u32 audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
static u32 audit_backlog_wait_overflow = 0;
/* The identity of the user shutting down the audit system. */
kuid_t audit_sig_uid = INVALID_UID;
@ -272,7 +272,7 @@ void audit_log_lost(const char *message)
if (print) {
if (printk_ratelimit())
pr_warn("audit_lost=%d audit_rate_limit=%d audit_backlog_limit=%d\n",
pr_warn("audit_lost=%u audit_rate_limit=%u audit_backlog_limit=%u\n",
atomic_read(&audit_lost),
audit_rate_limit,
audit_backlog_limit);
@ -280,7 +280,7 @@ void audit_log_lost(const char *message)
}
}
static int audit_log_config_change(char *function_name, int new, int old,
static int audit_log_config_change(char *function_name, u32 new, u32 old,
int allow_changes)
{
struct audit_buffer *ab;
@ -289,7 +289,7 @@ static int audit_log_config_change(char *function_name, int new, int old,
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
if (unlikely(!ab))
return rc;
audit_log_format(ab, "%s=%d old=%d", function_name, new, old);
audit_log_format(ab, "%s=%u old=%u", function_name, new, old);
audit_log_session_info(ab);
rc = audit_log_task_context(ab);
if (rc)
@ -299,9 +299,10 @@ static int audit_log_config_change(char *function_name, int new, int old,
return rc;
}
static int audit_do_config_change(char *function_name, int *to_change, int new)
static int audit_do_config_change(char *function_name, u32 *to_change, u32 new)
{
int allow_changes, rc = 0, old = *to_change;
int allow_changes, rc = 0;
u32 old = *to_change;
/* check if we are locked */
if (audit_enabled == AUDIT_LOCKED)
@ -324,23 +325,23 @@ static int audit_do_config_change(char *function_name, int *to_change, int new)
return rc;
}
static int audit_set_rate_limit(int limit)
static int audit_set_rate_limit(u32 limit)
{
return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit);
}
static int audit_set_backlog_limit(int limit)
static int audit_set_backlog_limit(u32 limit)
{
return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit);
}
static int audit_set_backlog_wait_time(int timeout)
static int audit_set_backlog_wait_time(u32 timeout)
{
return audit_do_config_change("audit_backlog_wait_time",
&audit_backlog_wait_time, timeout);
}
static int audit_set_enabled(int state)
static int audit_set_enabled(u32 state)
{
int rc;
if (state < AUDIT_OFF || state > AUDIT_LOCKED)
@ -353,7 +354,7 @@ static int audit_set_enabled(int state)
return rc;
}
static int audit_set_failure(int state)
static int audit_set_failure(u32 state)
{
if (state != AUDIT_FAIL_SILENT
&& state != AUDIT_FAIL_PRINTK
@ -688,7 +689,7 @@ static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE);
audit_log_task_info(ab, current);
audit_log_format(ab, "feature=%s old=%d new=%d old_lock=%d new_lock=%d res=%d",
audit_log_format(ab, "feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d",
audit_feature_names[which], !!old_feature, !!new_feature,
!!old_lock, !!new_lock, res);
audit_log_end(ab);
@ -1144,16 +1145,16 @@ __setup("audit=", audit_enable);
* audit_backlog_limit=<n> */
static int __init audit_backlog_limit_set(char *str)
{
long int audit_backlog_limit_arg;
u32 audit_backlog_limit_arg;
pr_info("audit_backlog_limit: ");
if (kstrtol(str, 0, &audit_backlog_limit_arg)) {
pr_cont("using default of %d, unable to parse %s\n",
if (kstrtouint(str, 0, &audit_backlog_limit_arg)) {
pr_cont("using default of %u, unable to parse %s\n",
audit_backlog_limit, str);
return 1;
}
if (audit_backlog_limit_arg >= 0)
audit_backlog_limit = (int)audit_backlog_limit_arg;
audit_backlog_limit = audit_backlog_limit_arg;
pr_cont("%d\n", audit_backlog_limit);
return 1;

2
kernel/audit.h
View file

@ -209,7 +209,7 @@ struct audit_context {
#endif
};
extern int audit_ever_enabled;
extern u32 audit_ever_enabled;
extern void audit_copy_inode(struct audit_names *name,
const struct dentry *dentry,