[PATCH] Cygwin: sched_setscheduler: Fix crash if pid of other process is used

[Christian Franke]

Obviously my testcases for the SCHED_* enhancement were incomplete, sorry.

-- 
Regards,
Christian

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From a9e48b5d738c2a683826ab220155778f0f57f003 Mon Sep 17 00:00:00 2001
From: Christian Franke <christian.franke@t-online.de>
Date: Fri, 21 Feb 2025 17:25:51 +0100
Subject: [PATCH] Cygwin: sched_setscheduler: Fix crash if pid of other process
 is used

Add missing PID_MAP_RW to allow changes of _pinfo::sched_policy.

Fixes: 48b189245a13 ("Cygwin: sched_setscheduler: accept SCHED_OTHER, SCHED_FIFO and SCHED_RR")
Signed-off-by: Christian Franke <christian.franke@t-online.de>
---
 winsup/cygwin/sched.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/winsup/cygwin/sched.cc b/winsup/cygwin/sched.cc
index 43b17357b..86941b2ac 100644
--- a/winsup/cygwin/sched.cc
+++ b/winsup/cygwin/sched.cc
@@ -406,7 +406,7 @@ sched_setscheduler (pid_t pid, int policy,
       return -1;
     }
 
-  pinfo p (pid ? pid : getpid ());
+  pinfo p ((pid ? pid : getpid ()), PID_MAP_RW);
   if (!p)
     {
       set_errno (ESRCH);
-- 
2.45.1