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y2038: move itimer reset into itimer.c 

Preparing for a change to the itimer internals, stop using the
do_setitimer() symbol and instead use a new higher-level interface.

The do_getitimer()/do_setitimer functions can now be made static,
allowing the compiler to potentially produce better object code.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2019-10-25 21:37:43 +02:00
parent 4c22ea2b91
commit ddbc7d0657
3 changed files with 21 additions and 13 deletions
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9
include/linux/time.h
View File

@ -35,10 +35,11 @@ extern time64_t mktime64(const unsigned int year, const unsigned int mon,
extern u32 (*arch_gettimeoffset)(void);
#endif
struct itimerval;
extern int do_setitimer(int which, struct itimerval *value,
struct itimerval *ovalue);
extern int do_getitimer(int which, struct itimerval *value);
#ifdef CONFIG_POSIX_TIMERS
extern void clear_itimer(void);
#else
static inline void clear_itimer(void) {}
#endif
extern long do_utimes(int dfd, const char __user *filename, struct timespec64 *times, int flags);

15
kernel/time/itimer.c
View File

@ -73,7 +73,7 @@ static void get_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
value->it_interval = ns_to_timeval(interval);
}
int do_getitimer(int which, struct itimerval *value)
static int do_getitimer(int which, struct itimerval *value)
{
struct task_struct *tsk = current;
@ -197,7 +197,7 @@ static void set_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
#define timeval_valid(t) \
(((t)->tv_sec >= 0) && (((unsigned long) (t)->tv_usec) < USEC_PER_SEC))
int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
static int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
{
struct task_struct *tsk = current;
struct hrtimer *timer;
@ -249,6 +249,17 @@ again:
return 0;
}
#ifdef CONFIG_SECURITY_SELINUX
void clear_itimer(void)
{
struct itimerval v = {};
int i;
for (i = 0; i < 3; i++)
do_setitimer(i, &v, NULL);
}
#endif
#ifdef __ARCH_WANT_SYS_ALARM
/**

10
security/selinux/hooks.c
View File

@ -2549,9 +2549,8 @@ static void selinux_bprm_committing_creds(struct linux_binprm *bprm)
static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
{
const struct task_security_struct *tsec = selinux_cred(current_cred());
struct itimerval itimer;
u32 osid, sid;
int rc, i;
int rc;
osid = tsec->osid;
sid = tsec->sid;
@ -2569,11 +2568,8 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
rc = avc_has_perm(&selinux_state,
osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL);
if (rc) {
if (IS_ENABLED(CONFIG_POSIX_TIMERS)) {
memset(&itimer, 0, sizeof itimer);
for (i = 0; i < 3; i++)
do_setitimer(i, &itimer, NULL);
}
clear_itimer();
spin_lock_irq(&current->sighand->siglock);
if (!fatal_signal_pending(current)) {
flush_sigqueue(&current->pending);