From 2bed0bb09661bcd72d2d3470329e88eb7b6966a0 Mon Sep 17 00:00:00 2001
From: Ian Lewis <ianlewis@google.com>
Date: Thu, 20 May 2021 23:42:10 -0700
Subject: Send SIGPIPE for closed pipes.

Fixes #5974
Updates #161

PiperOrigin-RevId: 375024740
---
 pkg/sentry/kernel/pipe/pipe_util.go | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'pkg/sentry/kernel/pipe')

diff --git a/pkg/sentry/kernel/pipe/pipe_util.go b/pkg/sentry/kernel/pipe/pipe_util.go
index 2d89b9ccd..24e467e93 100644
--- a/pkg/sentry/kernel/pipe/pipe_util.go
+++ b/pkg/sentry/kernel/pipe/pipe_util.go
@@ -86,6 +86,12 @@ func (p *Pipe) Write(ctx context.Context, src usermem.IOSequence) (int64, error)
 	if n > 0 {
 		p.Notify(waiter.ReadableEvents)
 	}
+	if err == unix.EPIPE {
+		// If we are returning EPIPE send SIGPIPE to the task.
+		if sendSig := linux.SignalNoInfoFuncFromContext(ctx); sendSig != nil {
+			sendSig(linux.SIGPIPE)
+		}
+	}
 	return n, err
 }
 
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