From: Oleg Nesterov <oleg@xxxxxxxxxx>
Subject: wait: allow sys_waitid() to accept __WNOTHREAD/__WCLONE/__WALL
I see no reason why waitid() can't support other linux-specific flags
allowed in sys_wait4().
In particular this change can help if we reconsider the previous change
("wait/ptrace: assume __WALL if the child is traced") which adds the
"automagical" __WALL for debugger.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: Jan Kratochvil <jan.kratochvil@xxxxxxxxxx>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@xxxxxxxxx>
Cc: Pedro Alves <palves@xxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxxxxx>
Cc: <syzkaller@xxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/exit.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN kernel/exit.c~wait-allow-sys_waitid-to-accept-__wnothread-__wclone-__wall kernel/exit.c
--- a/kernel/exit.c~wait-allow-sys_waitid-to-accept-__wnothread-__wclone-__wall
+++ a/kernel/exit.c
@@ -1535,7 +1535,8 @@ SYSCALL_DEFINE5(waitid, int, which, pid_
enum pid_type type;
long ret;
- if (options & ~(WNOHANG|WNOWAIT|WEXITED|WSTOPPED|WCONTINUED))
+ if (options & ~(WNOHANG|WNOWAIT|WEXITED|WSTOPPED|WCONTINUED|
+ __WNOTHREAD|__WCLONE|__WALL))
return -EINVAL;
if (!(options & (WEXITED|WSTOPPED|WCONTINUED)))
return -EINVAL;
_
--
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