From: Ilya Leoshkevich <iii@linux.ibm.com>
Date: Tue, 1 Jun 2021 14:55:59 +0000 (+0200)
Subject: linux-user: Let sigaction query SIGKILL/SIGSTOP
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ee3500d33a7431fbcc357a35ce1a46fcf13128cc;p=qemu.git

linux-user: Let sigaction query SIGKILL/SIGSTOP

The kernel allows doing this, so let's allow this in qemu as well.
Valgrind relies on this.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210601145600.3131040-2-iii@linux.ibm.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---

diff --git a/linux-user/signal.c b/linux-user/signal.c
index 0f19c59dee..a8faea6f09 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -853,7 +853,11 @@ int do_sigaction(int sig, const struct target_sigaction *act,
 
     trace_signal_do_sigaction_guest(sig, TARGET_NSIG);
 
-    if (sig < 1 || sig > TARGET_NSIG || sig == TARGET_SIGKILL || sig == TARGET_SIGSTOP) {
+    if (sig < 1 || sig > TARGET_NSIG) {
+        return -TARGET_EINVAL;
+    }
+
+    if (act && (sig == TARGET_SIGKILL || sig == TARGET_SIGSTOP)) {
         return -TARGET_EINVAL;
     }