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To: covertusername976@gmail.com, 9front@9front.org
Subject: kernel: postnote patch
Date: Sat, 4 Apr 2020 23:48:26 -0500
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X-Bullshit: table scripting hypervisor app 

Currently, if you do a zero-sized write into the /proc/$pid/note file,
it will post the empty note successfully and cause the process to exit
with no status code.  This patch disables zero-sized note strings
altogether.

diff -r f3cc6939a481 sys/src/9/port/proc.c
--- a/sys/src/9/port/proc.c	Wed Apr 01 22:57:15 2020 +1030
+++ b/sys/src/9/port/proc.c	Sat Apr 04 23:31:39 2020 -0500
@@ -903,6 +903,9 @@
 		return 0;
 	}
 
+	if(strlen(n) == 0)
+		return 0;
+
 	if(n != nil && flag != NUser && (p->notify == nil || p->notified))
 		p->nnote = 0;