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| author | Al Viro <viro@zeniv.linux.org.uk> | 2017-05-15 03:25:02 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-05-21 20:11:00 +0300 |
| commit | ce72a16fa705f960ca2352e95a7c5f4801475e75 (patch) | |
| tree | 6dcdf27d851b4c9e50f689611a26f1dfc10ebef0 /kernel/sys.c | |
| parent | 7e95a225901a5d2fd140f14b4302805cecc22da7 (diff) | |
| download | linux-ce72a16fa705f960ca2352e95a7c5f4801475e75.tar.xz | |
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>
Diffstat (limited to 'kernel/sys.c')
| -rw-r--r-- | kernel/sys.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index 8a94b4eabcaa..dab1a0658a92 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1552,7 +1552,7 @@ static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) r->ru_oublock += task_io_get_oublock(t); } -static void k_getrusage(struct task_struct *p, int who, struct rusage *r) +void getrusage(struct task_struct *p, int who, struct rusage *r) { struct task_struct *t; unsigned long flags; @@ -1626,20 +1626,16 @@ out: r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ } -int getrusage(struct task_struct *p, int who, struct rusage __user *ru) +SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) { struct rusage r; - k_getrusage(p, who, &r); - return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; -} - -SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) -{ if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && who != RUSAGE_THREAD) return -EINVAL; - return getrusage(current, who, ru); + + getrusage(current, who, &r); + return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; } #ifdef CONFIG_COMPAT @@ -1651,7 +1647,7 @@ COMPAT_SYSCALL_DEFINE2(getrusage, int, who, struct compat_rusage __user *, ru) who != RUSAGE_THREAD) return -EINVAL; - k_getrusage(current, who, &r); + getrusage(current, who, &r); return put_compat_rusage(&r, ru); } #endif |