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wait4(2)/waitid(2): separate copying rusage to userland

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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 2017-05-14 20:25:02 -04:00
parent 7e95a22590
commit ce72a16fa7
3 changed files with 59 additions and 48 deletions
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2
include/linux/resource.h
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@ -6,7 +6,7 @@
struct task_struct;
int getrusage(struct task_struct *p, int who, struct rusage __user *ru);
void getrusage(struct task_struct *p, int who, struct rusage *ru);
int do_prlimit(struct task_struct *tsk, unsigned int resource,
struct rlimit *new_rlim, struct rlimit *old_rlim);