From 8e50750f122e59ea4cab4b4f696ef22b391bedc9 Mon Sep 17 00:00:00 2001 From: Marco Vedovati Date: Thu, 10 Aug 2023 14:43:53 -0700 Subject: [PATCH] libbpf: Set close-on-exec flag on gzopen Enable the close-on-exec flag when using gzopen. This is especially important for multithreaded programs making use of libbpf, where a fork + exec could race with libbpf library calls, potentially resulting in a file descriptor leaked to the new process. This got missed in 59842c5451fe ("libbpf: Ensure libbpf always opens files with O_CLOEXEC"). Fixes: 59842c5451fe ("libbpf: Ensure libbpf always opens files with O_CLOEXEC") Signed-off-by: Marco Vedovati Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20230810214350.106301-1-martin.kelly@crowdstrike.com --- tools/lib/bpf/libbpf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 17883f5a44b9..b14a4376a86e 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -1978,9 +1978,9 @@ static int bpf_object__read_kconfig_file(struct bpf_object *obj, void *data) return -ENAMETOOLONG; /* gzopen also accepts uncompressed files. */ - file = gzopen(buf, "r"); + file = gzopen(buf, "re"); if (!file) - file = gzopen("/proc/config.gz", "r"); + file = gzopen("/proc/config.gz", "re"); if (!file) { pr_warn("failed to open system Kconfig\n");