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wait4(2)/waitid(2): separate copying rusage to userland
New helpers: kernel_waitid() and kernel_wait4(). sys_waitid(), sys_wait4() and their compat variants switched to those. Copying struct rusage to userland is left to syscall itself. For compat_sys_wait4() that eliminates the use of set_fs() completely. For compat_sys_waitid() it's still needed (for siginfo handling); that will change shortly. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
7e95a22590
commit
ce72a16fa7
@ -6,7 +6,7 @@
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struct task_struct;
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int getrusage(struct task_struct *p, int who, struct rusage __user *ru);
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void getrusage(struct task_struct *p, int who, struct rusage *ru);
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int do_prlimit(struct task_struct *tsk, unsigned int resource,
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struct rlimit *new_rlim, struct rlimit *old_rlim);
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@ -1003,7 +1003,7 @@ struct wait_opts {
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struct siginfo __user *wo_info;
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int __user *wo_stat;
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struct rusage __user *wo_rusage;
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struct rusage *wo_rusage;
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wait_queue_t child_wait;
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int notask_error;
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@ -1054,8 +1054,10 @@ static int wait_noreap_copyout(struct wait_opts *wo, struct task_struct *p,
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pid_t pid, uid_t uid, int why, int status)
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{
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struct siginfo __user *infop;
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int retval = wo->wo_rusage
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? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0;
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int retval = 0;
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if (wo->wo_rusage)
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getrusage(p, RUSAGE_BOTH, wo->wo_rusage);
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put_task_struct(p);
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infop = wo->wo_info;
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@ -1182,8 +1184,9 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
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spin_unlock_irq(¤t->sighand->siglock);
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}
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retval = wo->wo_rusage
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? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0;
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if (wo->wo_rusage)
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getrusage(p, RUSAGE_BOTH, wo->wo_rusage);
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retval = 0;
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status = (p->signal->flags & SIGNAL_GROUP_EXIT)
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? p->signal->group_exit_code : p->exit_code;
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if (!retval && wo->wo_stat)
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@ -1316,8 +1319,9 @@ unlock_sig:
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if (unlikely(wo->wo_flags & WNOWAIT))
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return wait_noreap_copyout(wo, p, pid, uid, why, exit_code);
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retval = wo->wo_rusage
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? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0;
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if (wo->wo_rusage)
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getrusage(p, RUSAGE_BOTH, wo->wo_rusage);
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retval = 0;
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if (!retval && wo->wo_stat)
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retval = put_user((exit_code << 8) | 0x7f, wo->wo_stat);
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@ -1377,8 +1381,9 @@ static int wait_task_continued(struct wait_opts *wo, struct task_struct *p)
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sched_annotate_sleep();
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if (!wo->wo_info) {
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retval = wo->wo_rusage
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? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0;
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if (wo->wo_rusage)
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getrusage(p, RUSAGE_BOTH, wo->wo_rusage);
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retval = 0;
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put_task_struct(p);
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if (!retval && wo->wo_stat)
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retval = put_user(0xffff, wo->wo_stat);
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@ -1618,8 +1623,8 @@ end:
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return retval;
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}
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SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *,
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infop, int, options, struct rusage __user *, ru)
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static long kernel_waitid(int which, pid_t upid, struct siginfo __user *infop,
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int options, struct rusage *ru)
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{
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struct wait_opts wo;
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struct pid *pid = NULL;
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@ -1687,8 +1692,21 @@ SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *,
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return ret;
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}
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SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr,
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int, options, struct rusage __user *, ru)
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SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *,
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infop, int, options, struct rusage __user *, ru)
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{
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struct rusage r;
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long err = kernel_waitid(which, upid, infop, options, ru ? &r : NULL);
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if (!err) {
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if (ru && copy_to_user(ru, &r, sizeof(struct rusage)))
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return -EFAULT;
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}
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return err;
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}
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static long kernel_wait4(pid_t upid, int __user *stat_addr,
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int options, struct rusage *ru)
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{
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struct wait_opts wo;
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struct pid *pid = NULL;
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@ -1724,6 +1742,19 @@ SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr,
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return ret;
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}
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SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr,
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int, options, struct rusage __user *, ru)
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{
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struct rusage r;
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long err = kernel_wait4(upid, stat_addr, options, ru ? &r : NULL);
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if (err > 0) {
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if (ru && copy_to_user(ru, &r, sizeof(struct rusage)))
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return -EFAULT;
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}
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return err;
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}
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#ifdef __ARCH_WANT_SYS_WAITPID
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/*
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@ -1744,29 +1775,13 @@ COMPAT_SYSCALL_DEFINE4(wait4,
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int, options,
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struct compat_rusage __user *, ru)
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{
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if (!ru) {
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return sys_wait4(pid, stat_addr, options, NULL);
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} else {
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struct rusage r;
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int ret;
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unsigned int status;
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mm_segment_t old_fs = get_fs();
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set_fs (KERNEL_DS);
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ret = sys_wait4(pid,
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(stat_addr ?
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(unsigned int __user *) &status : NULL),
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options, (struct rusage __user *) &r);
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set_fs (old_fs);
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if (ret > 0) {
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if (put_compat_rusage(&r, ru))
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return -EFAULT;
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if (stat_addr && put_user(status, stat_addr))
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return -EFAULT;
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}
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return ret;
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struct rusage r;
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long err = kernel_wait4(pid, stat_addr, options, ru ? &r : NULL);
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if (err > 0) {
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if (ru && put_compat_rusage(&r, ru))
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return -EFAULT;
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}
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return err;
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}
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COMPAT_SYSCALL_DEFINE5(waitid,
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@ -1782,8 +1797,8 @@ COMPAT_SYSCALL_DEFINE5(waitid,
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memset(&info, 0, sizeof(info));
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set_fs(KERNEL_DS);
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ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
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uru ? (struct rusage __user *)&ru : NULL);
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ret = kernel_waitid(which, pid, (siginfo_t __user *)&info, options,
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uru ? &ru : NULL);
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set_fs(old_fs);
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if ((ret < 0) || (info.si_signo == 0))
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16
kernel/sys.c
16
kernel/sys.c
@ -1552,7 +1552,7 @@ static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r)
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r->ru_oublock += task_io_get_oublock(t);
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}
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static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
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void getrusage(struct task_struct *p, int who, struct rusage *r)
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{
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struct task_struct *t;
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unsigned long flags;
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@ -1626,20 +1626,16 @@ out:
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r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */
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}
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int getrusage(struct task_struct *p, int who, struct rusage __user *ru)
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SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru)
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{
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struct rusage r;
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k_getrusage(p, who, &r);
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return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
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}
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SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru)
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{
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if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN &&
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who != RUSAGE_THREAD)
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return -EINVAL;
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return getrusage(current, who, ru);
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getrusage(current, who, &r);
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return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
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}
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#ifdef CONFIG_COMPAT
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@ -1651,7 +1647,7 @@ COMPAT_SYSCALL_DEFINE2(getrusage, int, who, struct compat_rusage __user *, ru)
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who != RUSAGE_THREAD)
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return -EINVAL;
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k_getrusage(current, who, &r);
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getrusage(current, who, &r);
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return put_compat_rusage(&r, ru);
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}
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#endif
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