[Qemu-devel] [PATCH 4/6] linux-user: Check contains_hostfd in select syscalls

[Richard Henderson <richard.henderson@linaro.org>]

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/syscall.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 5339f0bc1c..b98125829b 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1506,6 +1506,11 @@ static abi_long do_select(int n,
     if (ret) {
         return ret;
     }
+    if (contains_hostfd(&rfds) ||
+        contains_hostfd(&wfds) ||
+        contains_hostfd(&efds)) {
+        return -TARGET_EBADF;
+    }
 
     if (target_tv_addr) {
         if (copy_from_user_timeval(&tv, target_tv_addr))
@@ -9392,6 +9397,11 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
             if (ret) {
                 goto fail;
             }
+            if (contains_hostfd(&rfds) ||
+                contains_hostfd(&wfds) ||
+                contains_hostfd(&efds)) {
+                goto ebadf;
+            }
 
             /*
              * This takes a timespec, and not a timeval, so we cannot
-- 
2.17.0