agent: re-enable the standard SIGPIPE behavior

The Rust standard library had suppressed the default SIGPIPE
behavior, see rust-lang/rust#13158.
Since the parent's signal handler would be inherited by it's child
process, thus we should re-enable the standard SIGPIPE behavior as a
workaround.

Fixes: kata-containers#1887

Signed-off-by: fupan.lfp <[email protected]>
(cherry picked from commit 0ae364c)
Signed-off-by: Fabiano Fidêncio <[email protected]>

Author: fupan.lfp

src/agent/src/main.rs

@@ -248,6 +248,7 @@ fn main() -> std::result::Result<(), Box<dyn std::error::Error>> {
     }
 
     if args.len() == 2 && args[1] == "init" {
+        reset_sigpipe();
         rustjail::container::init_child();
         exit(0);
     }
@@ -358,5 +359,16 @@ fn sethostname(hostname: &OsStr) -> Result<()> {
     }
 }
 
+// The Rust standard library had suppressed the default SIGPIPE behavior,
+// see https://github.com/rust-lang/rust/pull/13158.
+// Since the parent's signal handler would be inherited by it's child process,
+// thus we should re-enable the standard SIGPIPE behavior as a workaround to
+// fix the issue of https://github.com/kata-containers/kata-containers/issues/1887.
+fn reset_sigpipe() {
+    unsafe {
+        libc::signal(libc::SIGPIPE, libc::SIG_DFL);
+    }
+}
+
 use crate::config::AgentConfig;
 use std::os::unix::io::{FromRawFd, RawFd};