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50b796e645
cookie_uid_helper_example.c: In function ‘main’:
cookie_uid_helper_example.c:178:69: warning: ‘ -j ACCEPT’ directive
writing 10 bytes into a region of size between 8 and 58
[-Wformat-overflow=]
178 | sprintf(rules, "iptables -A OUTPUT -m bpf --object-pinned %s -j ACCEPT",
| ^~~~~~~~~~
/home/kkd/src/linux/samples/bpf/cookie_uid_helper_example.c:178:9: note:
‘sprintf’ output between 53 and 103 bytes into a destination of size 100
178 | sprintf(rules, "iptables -A OUTPUT -m bpf --object-pinned %s -j ACCEPT",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
179 | file);
| ~~~~~
Fix by using snprintf and a sufficiently sized buffer.
tracex4_user.c:35:15: warning: ‘write’ reading 12 bytes from a region of
size 11 [-Wstringop-overread]
35 | key = write(1, "\e[1;1H\e[2J", 12); /* clear screen */
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Use size as 11.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210821002010.845777-2-memxor@gmail.com
98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include <string.h>
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#include <time.h>
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#include <sys/resource.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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struct pair {
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long long val;
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__u64 ip;
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};
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static __u64 time_get_ns(void)
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{
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return ts.tv_sec * 1000000000ull + ts.tv_nsec;
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}
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static void print_old_objects(int fd)
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{
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long long val = time_get_ns();
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__u64 key, next_key;
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struct pair v;
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key = write(1, "\e[1;1H\e[2J", 11); /* clear screen */
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key = -1;
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while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
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bpf_map_lookup_elem(fd, &next_key, &v);
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key = next_key;
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if (val - v.val < 1000000000ll)
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/* object was allocated more then 1 sec ago */
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continue;
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printf("obj 0x%llx is %2lldsec old was allocated at ip %llx\n",
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next_key, (val - v.val) / 1000000000ll, v.ip);
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}
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}
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int main(int ac, char **argv)
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{
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struct bpf_link *links[2];
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struct bpf_program *prog;
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struct bpf_object *obj;
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char filename[256];
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int map_fd, i, j = 0;
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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obj = bpf_object__open_file(filename, NULL);
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if (libbpf_get_error(obj)) {
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fprintf(stderr, "ERROR: opening BPF object file failed\n");
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return 0;
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}
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/* load BPF program */
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if (bpf_object__load(obj)) {
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fprintf(stderr, "ERROR: loading BPF object file failed\n");
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goto cleanup;
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}
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map_fd = bpf_object__find_map_fd_by_name(obj, "my_map");
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if (map_fd < 0) {
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fprintf(stderr, "ERROR: finding a map in obj file failed\n");
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goto cleanup;
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}
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bpf_object__for_each_program(prog, obj) {
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links[j] = bpf_program__attach(prog);
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if (libbpf_get_error(links[j])) {
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fprintf(stderr, "ERROR: bpf_program__attach failed\n");
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links[j] = NULL;
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goto cleanup;
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}
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j++;
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}
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for (i = 0; ; i++) {
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print_old_objects(map_fd);
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sleep(1);
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}
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cleanup:
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for (j--; j >= 0; j--)
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bpf_link__destroy(links[j]);
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bpf_object__close(obj);
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return 0;
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}
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