[Qemu-devel] [PATCH v2 16/19] linux-user: Restart fork() if signals pending

[Peter Maydell <peter.maydell@linaro.org>]

From: Timothy E Baldwin <T.E.Baldwin99@members.leeds.ac.uk>

If there is a signal pending during fork() the signal handler will
erroneously be called in both the parent and child, so handle any
pending signals first.

Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk>
Message-id: 1441497448-32489-20-git-send-email-T.E.Baldwin99@members.leeds.ac.uk
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 linux-user/syscall.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 549f571..7d5f123 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -4796,6 +4796,11 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,
         if ((flags & ~(CSIGNAL | CLONE_NPTL_FLAGS2)) != 0) {
             return -TARGET_EINVAL;
         }
+
+        if (block_signals()) {
+            return -TARGET_ERESTARTSYS;
+        }
+
         fork_start();
         ret = fork();
         if (ret == 0) {
-- 
1.9.1