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libbpf: Set close-on-exec flag on gzopen

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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 59842c5451 ("libbpf: Ensure
libbpf always opens files with O_CLOEXEC").

Fixes: 59842c5451 ("libbpf: Ensure libbpf always opens files with O_CLOEXEC")
Signed-off-by: Marco Vedovati <marco.vedovati@crowdstrike.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230810214350.106301-1-martin.kelly@crowdstrike.com
This commit is contained in:
Marco Vedovati 2023-08-10 14:43:53 -07:00 committed by Daniel Borkmann
parent 6da4fea89d
commit 8e50750f12
1 changed files with 2 additions and 2 deletions
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4
tools/lib/bpf/libbpf.c
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@ -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");