linux-user: Implement PR_{GET,SET}_CHILD_SUBREAPER
The "set" prctl passes through integral values.
The "get" prctl returns the value into a pointer.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1929
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 597bdf0..0801ae1 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6450,11 +6450,21 @@
case PR_SET_NO_NEW_PRIVS:
case PR_GET_IO_FLUSHER:
case PR_SET_IO_FLUSHER:
+ case PR_SET_CHILD_SUBREAPER:
/* Some prctl options have no pointer arguments and we can pass on. */
return get_errno(prctl(option, arg2, arg3, arg4, arg5));
case PR_GET_CHILD_SUBREAPER:
- case PR_SET_CHILD_SUBREAPER:
+ {
+ int val;
+ ret = get_errno(prctl(PR_GET_CHILD_SUBREAPER, &val,
+ arg3, arg4, arg5));
+ if (!is_error(ret) && put_user_s32(val, arg2)) {
+ return -TARGET_EFAULT;
+ }
+ return ret;
+ }
+
case PR_GET_SPECULATION_CTRL:
case PR_SET_SPECULATION_CTRL:
case PR_GET_TID_ADDRESS:
