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bpf: Always test unprivileged programs 

If selftests are run as root, then execute the unprivileged checks as
well. This switch from 243 to 368 tests.

The test numbers are suffixed with "/u" when executed as unprivileged or
with "/p" when executed as privileged.

The geteuid() check is replaced with a capability check.

Handling capabilities requires the libcap dependency.

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mickaël Salaün 2017-02-10 00:21:37 +01:00 committed by David S. Miller
parent 7f73f39a89
commit d02d8986a7
2 changed files with 64 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/testing/selftests/bpf/Makefile
View File

@ -1,4 +1,4 @@
CFLAGS += -Wall -O2 -I../../../include/uapi
CFLAGS += -Wall -O2 -lcap -I../../../include/uapi
test_objs = test_verifier test_tag test_maps test_lru_map test_lpm_map

68
tools/testing/selftests/bpf/test_verifier.c
View File

@ -16,6 +16,7 @@
#include <stdbool.h>
#include <sched.h>
#include <sys/capability.h>
#include <sys/resource.h>
#include <linux/unistd.h>
@ -4574,6 +4575,55 @@ fail_log:
goto close_fds;
}
static bool is_admin(void)
{
cap_t caps;
cap_flag_value_t sysadmin = CAP_CLEAR;
const cap_value_t cap_val = CAP_SYS_ADMIN;
if (!CAP_IS_SUPPORTED(CAP_SETFCAP)) {
perror("cap_get_flag");
return false;
}
caps = cap_get_proc();
if (!caps) {
perror("cap_get_proc");
return false;
}
if (cap_get_flag(caps, cap_val, CAP_EFFECTIVE, &sysadmin))
perror("cap_get_flag");
if (cap_free(caps))
perror("cap_free");
return (sysadmin == CAP_SET);
}
static int set_admin(bool admin)
{
cap_t caps;
const cap_value_t cap_val = CAP_SYS_ADMIN;
int ret = -1;
caps = cap_get_proc();
if (!caps) {
perror("cap_get_proc");
return -1;
}
if (cap_set_flag(caps, CAP_EFFECTIVE, 1, &cap_val,
admin ? CAP_SET : CAP_CLEAR)) {
perror("cap_set_flag");
goto out;
}
if (cap_set_proc(caps)) {
perror("cap_set_proc");
goto out;
}
ret = 0;
out:
if (cap_free(caps))
perror("cap_free");
return ret;
}
static int do_test(bool unpriv, unsigned int from, unsigned int to)
{
int i, passes = 0, errors = 0;
@ -4584,11 +4634,19 @@ static int do_test(bool unpriv, unsigned int from, unsigned int to)
/* Program types that are not supported by non-root we
* skip right away.
*/
if (unpriv && test->prog_type)
continue;
if (!test->prog_type) {
if (!unpriv)
set_admin(false);
printf("#%d/u %s ", i, test->descr);
do_test_single(test, true, &passes, &errors);
if (!unpriv)
set_admin(true);
}
printf("#%d %s ", i, test->descr);
do_test_single(test, unpriv, &passes, &errors);
if (!unpriv) {
printf("#%d/p %s ", i, test->descr);
do_test_single(test, false, &passes, &errors);
}
}
printf("Summary: %d PASSED, %d FAILED\n", passes, errors);
@ -4600,7 +4658,7 @@ int main(int argc, char **argv)
struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
struct rlimit rlim = { 1 << 20, 1 << 20 };
unsigned int from = 0, to = ARRAY_SIZE(tests);
bool unpriv = geteuid() != 0;
bool unpriv = !is_admin();
if (argc == 3) {
unsigned int l = atoi(argv[argc - 2]);