rexec: don't close stderr

Otherwise we'll fail to attach to containers later on. Fixes: https://discuss.linuxcontainers.org/t/error-failed-to-retrieve-pid-of-executing-child-processSigned-off-by: Christian Brauner <christian.brauner@ubuntu.com>

rexec: don't close stderr
b75c1e61 · Christian Brauner · 45580870 · b75c1e61
Unverified Commit b75c1e61 authored Mar 18, 2021 by Christian Brauner
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rexec.c src/lxc/rexec.c +1 -1

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--- a/src/lxc/rexec.c
+++ b/src/lxc/rexec.c
@@ -162,7 +162,7 @@ static void lxc_rexec_as_memfd(char **argv, char **envp, const char *memfd_name)
 	if (execfd < 0)
 		return;

-	ret = close_range(STDERR_FILENO, MAX_FILENO, CLOSE_RANGE_CLOEXEC);
+	ret = close_range(STDERR_FILENO + 1, MAX_FILENO, CLOSE_RANGE_CLOEXEC);
 	if (ret && (errno != ENOSYS && errno != EINVAL))
 		fprintf(stderr, "%m - Failed to mark all file descriptors as close-on-exec\n");
 	fexecve(execfd, argv, envp);