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selftests/bpf: check return value of fopen in test_verifier.c

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Commit 0a6748740368 ("selftests/bpf: Only run tests if !bpf_disabled")
forgot to check return value of fopen.

This caused some confusion, when running test_verifier (from
tools/testing/selftests/bpf/) on an older kernel (< v4.4) as it will
simply seqfault.

This fix avoids the segfault and prints an error, but allow program to
continue.  Given the sysctl was introduced in 1be7f75d1668 ("bpf:
enable non-root eBPF programs"), we know that the running kernel
cannot support unpriv, thus continue with unpriv_disabled = true.

Fixes: 0a6748740368 ("selftests/bpf: Only run tests if !bpf_disabled")
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jesper Dangaard Brouer 2018-05-17 19:39:31 +02:00 committed by Daniel Borkmann
parent 02f99df187
commit deea81228b
1 changed files with 5 additions and 0 deletions
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5
tools/testing/selftests/bpf/test_verifier.c
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@ -11713,6 +11713,11 @@ static void get_unpriv_disabled()
FILE *fd;
fd = fopen("/proc/sys/"UNPRIV_SYSCTL, "r");
if (!fd) {
perror("fopen /proc/sys/"UNPRIV_SYSCTL);
unpriv_disabled = true;
return;
}
if (fgets(buf, 2, fd) == buf && atoi(buf))
unpriv_disabled = true;
fclose(fd);