diff options
Diffstat (limited to 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 89 |
1 files changed, 52 insertions, 37 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index f98782bd27b6..d44f12948c5f 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -1003,7 +1003,7 @@ struct wait_opts { struct siginfo __user *wo_info; int __user *wo_stat; - struct rusage __user *wo_rusage; + struct rusage *wo_rusage; wait_queue_t child_wait; int notask_error; @@ -1054,8 +1054,10 @@ static int wait_noreap_copyout(struct wait_opts *wo, struct task_struct *p, pid_t pid, uid_t uid, int why, int status) { struct siginfo __user *infop; - int retval = wo->wo_rusage - ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0; + int retval = 0; + + if (wo->wo_rusage) + getrusage(p, RUSAGE_BOTH, wo->wo_rusage); put_task_struct(p); infop = wo->wo_info; @@ -1182,8 +1184,9 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p) spin_unlock_irq(¤t->sighand->siglock); } - retval = wo->wo_rusage - ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0; + if (wo->wo_rusage) + getrusage(p, RUSAGE_BOTH, wo->wo_rusage); + retval = 0; status = (p->signal->flags & SIGNAL_GROUP_EXIT) ? p->signal->group_exit_code : p->exit_code; if (!retval && wo->wo_stat) @@ -1316,8 +1319,9 @@ unlock_sig: if (unlikely(wo->wo_flags & WNOWAIT)) return wait_noreap_copyout(wo, p, pid, uid, why, exit_code); - retval = wo->wo_rusage - ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0; + if (wo->wo_rusage) + getrusage(p, RUSAGE_BOTH, wo->wo_rusage); + retval = 0; if (!retval && wo->wo_stat) retval = put_user((exit_code << 8) | 0x7f, wo->wo_stat); @@ -1377,8 +1381,9 @@ static int wait_task_continued(struct wait_opts *wo, struct task_struct *p) sched_annotate_sleep(); if (!wo->wo_info) { - retval = wo->wo_rusage - ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0; + if (wo->wo_rusage) + getrusage(p, RUSAGE_BOTH, wo->wo_rusage); + retval = 0; put_task_struct(p); if (!retval && wo->wo_stat) retval = put_user(0xffff, wo->wo_stat); @@ -1618,8 +1623,8 @@ end: return retval; } -SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *, - infop, int, options, struct rusage __user *, ru) +static long kernel_waitid(int which, pid_t upid, struct siginfo __user *infop, + int options, struct rusage *ru) { struct wait_opts wo; struct pid *pid = NULL; @@ -1687,8 +1692,21 @@ SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *, return ret; } -SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr, - int, options, struct rusage __user *, ru) +SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *, + infop, int, options, struct rusage __user *, ru) +{ + struct rusage r; + long err = kernel_waitid(which, upid, infop, options, ru ? &r : NULL); + + if (!err) { + if (ru && copy_to_user(ru, &r, sizeof(struct rusage))) + return -EFAULT; + } + return err; +} + +static long kernel_wait4(pid_t upid, int __user *stat_addr, + int options, struct rusage *ru) { struct wait_opts wo; struct pid *pid = NULL; @@ -1724,6 +1742,19 @@ SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr, return ret; } +SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr, + int, options, struct rusage __user *, ru) +{ + struct rusage r; + long err = kernel_wait4(upid, stat_addr, options, ru ? &r : NULL); + + if (err > 0) { + if (ru && copy_to_user(ru, &r, sizeof(struct rusage))) + return -EFAULT; + } + return err; +} + #ifdef __ARCH_WANT_SYS_WAITPID /* @@ -1744,29 +1775,13 @@ COMPAT_SYSCALL_DEFINE4(wait4, int, options, struct compat_rusage __user *, ru) { - if (!ru) { - return sys_wait4(pid, stat_addr, options, NULL); - } else { - struct rusage r; - int ret; - unsigned int status; - mm_segment_t old_fs = get_fs(); - - set_fs (KERNEL_DS); - ret = sys_wait4(pid, - (stat_addr ? - (unsigned int __user *) &status : NULL), - options, (struct rusage __user *) &r); - set_fs (old_fs); - - if (ret > 0) { - if (put_compat_rusage(&r, ru)) - return -EFAULT; - if (stat_addr && put_user(status, stat_addr)) - return -EFAULT; - } - return ret; + struct rusage r; + long err = kernel_wait4(pid, stat_addr, options, ru ? &r : NULL); + if (err > 0) { + if (ru && put_compat_rusage(&r, ru)) + return -EFAULT; } + return err; } COMPAT_SYSCALL_DEFINE5(waitid, @@ -1782,8 +1797,8 @@ COMPAT_SYSCALL_DEFINE5(waitid, memset(&info, 0, sizeof(info)); set_fs(KERNEL_DS); - ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, - uru ? (struct rusage __user *)&ru : NULL); + ret = kernel_waitid(which, pid, (siginfo_t __user *)&info, options, + uru ? &ru : NULL); set_fs(old_fs); if ((ret < 0) || (info.si_signo == 0)) |