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libbpf: Ensure libbpf always opens files with O_CLOEXEC

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Make sure that libbpf code always gets FD with O_CLOEXEC flag set,
regardless if file is open through open() or fopen(). For the latter
this means to add "e" to mode string, which is supported since pretty
ancient glibc v2.7.

Also drop the outdated TODO comment in usdt.c, which was already completed.

Suggested-by: Lennart Poettering <lennart@poettering.net>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230525221311.2136408-1-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko
2023-05-25 15:13:10 -07:00
committed by Andrii Nakryiko
parent cb23f981c3
commit ba7a44da68
4 changed files with 7 additions and 8 deletions
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6
src/libbpf.c
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@@ -4351,7 +4351,7 @@ static int bpf_get_map_info_from_fdinfo(int fd, struct bpf_map_info *info)
snprintf(file, sizeof(file), "/proc/%d/fdinfo/%d", getpid(), fd);
memset(info, 0, sizeof(*info));
fp = fopen(file, "r");
fp = fopen(file, "re");
if (!fp) {
err = -errno;
pr_warn("failed to open %s: %d. No procfs support?\n", file,
@@ -7455,7 +7455,7 @@ int libbpf_kallsyms_parse(kallsyms_cb_t cb, void *ctx)
int ret, err = 0;
FILE *f;
f = fopen("/proc/kallsyms", "r");
f = fopen("/proc/kallsyms", "re");
if (!f) {
err = -errno;
pr_warn("failed to open /proc/kallsyms: %d\n", err);
@@ -10075,7 +10075,7 @@ static int parse_uint_from_file(const char *file, const char *fmt)
int err, ret;
FILE *f;
f = fopen(file, "r");
f = fopen(file, "re");
if (!f) {
err = -errno;
pr_debug("failed to open '%s': %s\n", file,