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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>
This commit is contained in:
Richard Henderson 2024-03-01 14:52:30 -10:00
parent f9eebe31a7
commit 07726f522d
1 changed files with 11 additions and 1 deletions
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12
linux-user/syscall.c
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@ -6450,11 +6450,21 @@ static abi_long do_prctl(CPUArchState *env, abi_long option, abi_long arg2,
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: