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-rw-r--r--kernel/exit.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 516acdb0e0ec..f98782bd27b6 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -62,6 +62,7 @@
#include <linux/kcov.h>
#include <linux/random.h>
#include <linux/rcuwait.h>
+#include <linux/compat.h>
#include <linux/uaccess.h>
#include <asm/unistd.h>
@@ -1735,3 +1736,71 @@ SYSCALL_DEFINE3(waitpid, pid_t, pid, int __user *, stat_addr, int, options)
}
#endif
+
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE4(wait4,
+ compat_pid_t, pid,
+ compat_uint_t __user *, stat_addr,
+ 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;
+ }
+}
+
+COMPAT_SYSCALL_DEFINE5(waitid,
+ int, which, compat_pid_t, pid,
+ struct compat_siginfo __user *, infop, int, options,
+ struct compat_rusage __user *, uru)
+{
+ siginfo_t info;
+ struct rusage ru;
+ long ret;
+ mm_segment_t old_fs = get_fs();
+
+ 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);
+ set_fs(old_fs);
+
+ if ((ret < 0) || (info.si_signo == 0))
+ return ret;
+
+ if (uru) {
+ /* sys_waitid() overwrites everything in ru */
+ if (COMPAT_USE_64BIT_TIME)
+ ret = copy_to_user(uru, &ru, sizeof(ru));
+ else
+ ret = put_compat_rusage(&ru, uru);
+ if (ret)
+ return -EFAULT;
+ }
+
+ BUG_ON(info.si_code & __SI_MASK);
+ info.si_code |= __SI_CHLD;
+ return copy_siginfo_to_user32(infop, &info);
+}
+#endif