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bpf: selftests: Remove libcap usage from test_progs 

This patch removes the libcap usage from test_progs.
bind_perm.c is the only user.  cap_*_effective() helpers added in the
earlier patch are directly used instead.

No other selftest binary is using libcap, so '-lcap' is also removed
from the Makefile.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20220316173835.2039334-1-kafai@fb.com
This commit is contained in:
Martin KaFai Lau 2022-03-16 10:38:35 -07:00 committed by Alexei Starovoitov
parent b1c2768a82
commit 82cb2b3077
2 changed files with 11 additions and 38 deletions
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5
tools/testing/selftests/bpf/Makefile
View File

@ -25,7 +25,7 @@ CFLAGS += -g -O0 -rdynamic -Wall -Werror $(GENFLAGS) $(SAN_CFLAGS) \
-I$(CURDIR) -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR) \
-I$(TOOLSINCDIR) -I$(APIDIR) -I$(OUTPUT)
LDFLAGS += $(SAN_CFLAGS)
LDLIBS += -lcap -lelf -lz -lrt -lpthread
LDLIBS += -lelf -lz -lrt -lpthread
# Silence some warnings when compiled with clang
ifneq ($(LLVM),)
@ -480,7 +480,8 @@ TRUNNER_TESTS_DIR := prog_tests
TRUNNER_BPF_PROGS_DIR := progs
TRUNNER_EXTRA_SOURCES := test_progs.c cgroup_helpers.c trace_helpers.c \
network_helpers.c testing_helpers.c \
btf_helpers.c flow_dissector_load.h
btf_helpers.c flow_dissector_load.h \
cap_helpers.c
TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read $(OUTPUT)/bpf_testmod.ko \
ima_setup.sh \
$(wildcard progs/btf_dump_test_case_*.c)

44
tools/testing/selftests/bpf/prog_tests/bind_perm.c
View File

@ -4,9 +4,9 @@
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/capability.h>
#include "test_progs.h"
#include "cap_helpers.h"
#include "bind_perm.skel.h"
static int duration;
@ -49,41 +49,11 @@ close_socket:
close(fd);
}
bool cap_net_bind_service(cap_flag_value_t flag)
{
const cap_value_t cap_net_bind_service = CAP_NET_BIND_SERVICE;
cap_flag_value_t original_value;
bool was_effective = false;
cap_t caps;
caps = cap_get_proc();
if (CHECK(!caps, "cap_get_proc", "errno %d", errno))
goto free_caps;
if (CHECK(cap_get_flag(caps, CAP_NET_BIND_SERVICE, CAP_EFFECTIVE,
&original_value),
"cap_get_flag", "errno %d", errno))
goto free_caps;
was_effective = (original_value == CAP_SET);
if (CHECK(cap_set_flag(caps, CAP_EFFECTIVE, 1, &cap_net_bind_service,
flag),
"cap_set_flag", "errno %d", errno))
goto free_caps;
if (CHECK(cap_set_proc(caps), "cap_set_proc", "errno %d", errno))
goto free_caps;
free_caps:
CHECK(cap_free(caps), "cap_free", "errno %d", errno);
return was_effective;
}
void test_bind_perm(void)
{
bool cap_was_effective;
const __u64 net_bind_svc_cap = 1ULL << CAP_NET_BIND_SERVICE;
struct bind_perm *skel;
__u64 old_caps = 0;
int cgroup_fd;
if (create_netns())
@ -105,7 +75,8 @@ void test_bind_perm(void)
if (!ASSERT_OK_PTR(skel, "bind_v6_prog"))
goto close_skeleton;
cap_was_effective = cap_net_bind_service(CAP_CLEAR);
ASSERT_OK(cap_disable_effective(net_bind_svc_cap, &old_caps),
"cap_disable_effective");
try_bind(AF_INET, 110, EACCES);
try_bind(AF_INET6, 110, EACCES);
@ -113,8 +84,9 @@ void test_bind_perm(void)
try_bind(AF_INET, 111, 0);
try_bind(AF_INET6, 111, 0);
if (cap_was_effective)
cap_net_bind_service(CAP_SET);
if (old_caps & net_bind_svc_cap)
ASSERT_OK(cap_enable_effective(net_bind_svc_cap, NULL),
"cap_enable_effective");
close_skeleton:
bind_perm__destroy(skel);