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authorBreno Leitao <leitao@debian.org>2019-02-05 15:12:34 -0200
committerDaniel Borkmann <daniel@iogearbox.net>2019-02-06 15:48:43 +0100
commitdd9cef43c222df7c0d76d34451808e789952379d (patch)
tree7f89ce49c1d50fa0a22fac3ab3a13d50de2f6189 /tools/testing/selftests/bpf/test_maps.c
parenttools: bpftool: doc, fix incorrect text (diff)
downloadlinux-dev-dd9cef43c222df7c0d76d34451808e789952379d.tar.xz
linux-dev-dd9cef43c222df7c0d76d34451808e789952379d.zip
bpf: test_maps: fix possible out of bound access warning
When compiling test_maps selftest with GCC-8, it warns that an array might be indexed with a negative value, which could cause a negative out of bound access, depending on parameters of the function. This is the GCC-8 warning: gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated -DHAVE_GENHDR -I../../../include test_maps.c /home/breno/Devel/linux/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /home/breno/Devel/linux/tools/testing/selftests/bpf/test_maps In file included from test_maps.c:16: test_maps.c: In function ‘run_all_tests’: test_maps.c:1079:10: warning: array subscript -1 is below array bounds of ‘pid_t[<Ube20> + 1]’ [-Warray-bounds] assert(waitpid(pid[i], &status, 0) == pid[i]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ test_maps.c:1059:6: warning: array subscript -1 is below array bounds of ‘pid_t[<Ube20> + 1]’ [-Warray-bounds] pid[i] = fork(); ~~~^~~ This patch simply guarantees that the task(s) variables are unsigned, thus, they could never be a negative number (which they are not in current code anyway), hence avoiding an out of bound access warning. Signed-off-by: Breno Leitao <leitao@debian.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/testing/selftests/bpf/test_maps.c')
-rw-r--r--tools/testing/selftests/bpf/test_maps.c27
1 files changed, 14 insertions, 13 deletions
diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
index e7798dd97f4b..3c627771f965 100644
--- a/tools/testing/selftests/bpf/test_maps.c
+++ b/tools/testing/selftests/bpf/test_maps.c
@@ -45,7 +45,7 @@ static int map_flags;
} \
})
-static void test_hashmap(int task, void *data)
+static void test_hashmap(unsigned int task, void *data)
{
long long key, next_key, first_key, value;
int fd;
@@ -135,7 +135,7 @@ static void test_hashmap(int task, void *data)
close(fd);
}
-static void test_hashmap_sizes(int task, void *data)
+static void test_hashmap_sizes(unsigned int task, void *data)
{
int fd, i, j;
@@ -155,7 +155,7 @@ static void test_hashmap_sizes(int task, void *data)
}
}
-static void test_hashmap_percpu(int task, void *data)
+static void test_hashmap_percpu(unsigned int task, void *data)
{
unsigned int nr_cpus = bpf_num_possible_cpus();
BPF_DECLARE_PERCPU(long, value);
@@ -282,7 +282,7 @@ static int helper_fill_hashmap(int max_entries)
return fd;
}
-static void test_hashmap_walk(int task, void *data)
+static void test_hashmap_walk(unsigned int task, void *data)
{
int fd, i, max_entries = 1000;
long long key, value, next_key;
@@ -353,7 +353,7 @@ static void test_hashmap_zero_seed(void)
close(second);
}
-static void test_arraymap(int task, void *data)
+static void test_arraymap(unsigned int task, void *data)
{
int key, next_key, fd;
long long value;
@@ -408,7 +408,7 @@ static void test_arraymap(int task, void *data)
close(fd);
}
-static void test_arraymap_percpu(int task, void *data)
+static void test_arraymap_percpu(unsigned int task, void *data)
{
unsigned int nr_cpus = bpf_num_possible_cpus();
BPF_DECLARE_PERCPU(long, values);
@@ -504,7 +504,7 @@ static void test_arraymap_percpu_many_keys(void)
close(fd);
}
-static void test_devmap(int task, void *data)
+static void test_devmap(unsigned int task, void *data)
{
int fd;
__u32 key, value;
@@ -519,7 +519,7 @@ static void test_devmap(int task, void *data)
close(fd);
}
-static void test_queuemap(int task, void *data)
+static void test_queuemap(unsigned int task, void *data)
{
const int MAP_SIZE = 32;
__u32 vals[MAP_SIZE + MAP_SIZE/2], val;
@@ -577,7 +577,7 @@ static void test_queuemap(int task, void *data)
close(fd);
}
-static void test_stackmap(int task, void *data)
+static void test_stackmap(unsigned int task, void *data)
{
const int MAP_SIZE = 32;
__u32 vals[MAP_SIZE + MAP_SIZE/2], val;
@@ -642,7 +642,7 @@ static void test_stackmap(int task, void *data)
#define SOCKMAP_PARSE_PROG "./sockmap_parse_prog.o"
#define SOCKMAP_VERDICT_PROG "./sockmap_verdict_prog.o"
#define SOCKMAP_TCP_MSG_PROG "./sockmap_tcp_msg_prog.o"
-static void test_sockmap(int tasks, void *data)
+static void test_sockmap(unsigned int tasks, void *data)
{
struct bpf_map *bpf_map_rx, *bpf_map_tx, *bpf_map_msg, *bpf_map_break;
int map_fd_msg = 0, map_fd_rx = 0, map_fd_tx = 0, map_fd_break;
@@ -1268,10 +1268,11 @@ static void test_map_large(void)
}
#define run_parallel(N, FN, DATA) \
- printf("Fork %d tasks to '" #FN "'\n", N); \
+ printf("Fork %u tasks to '" #FN "'\n", N); \
__run_parallel(N, FN, DATA)
-static void __run_parallel(int tasks, void (*fn)(int task, void *data),
+static void __run_parallel(unsigned int tasks,
+ void (*fn)(unsigned int task, void *data),
void *data)
{
pid_t pid[tasks];
@@ -1312,7 +1313,7 @@ static void test_map_stress(void)
#define DO_UPDATE 1
#define DO_DELETE 0
-static void test_update_delete(int fn, void *data)
+static void test_update_delete(unsigned int fn, void *data)
{
int do_update = ((int *)data)[1];
int fd = ((int *)data)[0];