From: kernel test robot <lkp@intel.com>
To: kbuild-all@lists.01.org
Subject: Re: [PATCH bpf-next RFC v1 1/8] bpf: Introduce BPF support for kernel module function calls
Date: Tue, 31 Aug 2021 04:03:56 +0800 [thread overview]
Message-ID: <202108310348.IyuiGb67-lkp@intel.com> (raw)
In-Reply-To: <20210830173424.1385796-2-memxor@gmail.com>
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Hi Kumar,
[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on bpf-next/master]
url: https://github.com/0day-ci/linux/commits/Kumar-Kartikeya-Dwivedi/Support-kernel-module-function-calls-from-eBPF/20210831-013531
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: arc-allyesconfig (attached as .config)
compiler: arceb-elf-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/e868250a992dc2f10616aa6e2882072bb42bb1c5
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Kumar-Kartikeya-Dwivedi/Support-kernel-module-function-calls-from-eBPF/20210831-013531
git checkout e868250a992dc2f10616aa6e2882072bb42bb1c5
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
In file included from include/linux/perf_event.h:25,
from include/linux/trace_events.h:10,
from include/trace/syscall.h:7,
from include/linux/syscalls.h:87,
from kernel/bpf/syscall.c:9:
arch/arc/include/asm/perf_event.h:126:27: warning: 'arc_pmu_cache_map' defined but not used [-Wunused-const-variable=]
126 | static const unsigned int arc_pmu_cache_map[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
| ^~~~~~~~~~~~~~~~~
arch/arc/include/asm/perf_event.h:91:27: warning: 'arc_pmu_ev_hw_map' defined but not used [-Wunused-const-variable=]
91 | static const char * const arc_pmu_ev_hw_map[] = {
| ^~~~~~~~~~~~~~~~~
kernel/bpf/syscall.c: In function 'bpf_prog_load':
>> kernel/bpf/syscall.c:2402:1: warning: the frame size of 1164 bytes is larger than 1024 bytes [-Wframe-larger-than=]
2402 | }
| ^
vim +2402 kernel/bpf/syscall.c
09756af46893c1 Alexei Starovoitov 2014-09-26 2160
af2ac3e13e4575 Alexei Starovoitov 2021-05-13 2161 static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr)
09756af46893c1 Alexei Starovoitov 2014-09-26 2162 {
09756af46893c1 Alexei Starovoitov 2014-09-26 2163 enum bpf_prog_type type = attr->prog_type;
290248a5b7d829 Andrii Nakryiko 2020-12-03 2164 struct bpf_prog *prog, *dst_prog = NULL;
290248a5b7d829 Andrii Nakryiko 2020-12-03 2165 struct btf *attach_btf = NULL;
09756af46893c1 Alexei Starovoitov 2014-09-26 2166 char license[128];
09756af46893c1 Alexei Starovoitov 2014-09-26 2167 bool is_gpl;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2168 int err;
09756af46893c1 Alexei Starovoitov 2014-09-26 2169
09756af46893c1 Alexei Starovoitov 2014-09-26 2170 if (CHECK_ATTR(BPF_PROG_LOAD))
09756af46893c1 Alexei Starovoitov 2014-09-26 2171 return -EINVAL;
09756af46893c1 Alexei Starovoitov 2014-09-26 2172
c240eff63a1cf1 Jiong Wang 2019-05-24 2173 if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT |
c240eff63a1cf1 Jiong Wang 2019-05-24 2174 BPF_F_ANY_ALIGNMENT |
10d274e880eb20 Alexei Starovoitov 2019-08-22 2175 BPF_F_TEST_STATE_FREQ |
1e6c62a8821557 Alexei Starovoitov 2020-08-27 2176 BPF_F_SLEEPABLE |
c240eff63a1cf1 Jiong Wang 2019-05-24 2177 BPF_F_TEST_RND_HI32))
e07b98d9bffe41 David S. Miller 2017-05-10 2178 return -EINVAL;
e07b98d9bffe41 David S. Miller 2017-05-10 2179
e9ee9efc0d1765 David Miller 2018-11-30 2180 if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
e9ee9efc0d1765 David Miller 2018-11-30 2181 (attr->prog_flags & BPF_F_ANY_ALIGNMENT) &&
2c78ee898d8f10 Alexei Starovoitov 2020-05-13 2182 !bpf_capable())
e9ee9efc0d1765 David Miller 2018-11-30 2183 return -EPERM;
e9ee9efc0d1765 David Miller 2018-11-30 2184
09756af46893c1 Alexei Starovoitov 2014-09-26 2185 /* copy eBPF program license from user space */
af2ac3e13e4575 Alexei Starovoitov 2021-05-13 2186 if (strncpy_from_bpfptr(license,
af2ac3e13e4575 Alexei Starovoitov 2021-05-13 2187 make_bpfptr(attr->license, uattr.is_kernel),
09756af46893c1 Alexei Starovoitov 2014-09-26 2188 sizeof(license) - 1) < 0)
09756af46893c1 Alexei Starovoitov 2014-09-26 2189 return -EFAULT;
09756af46893c1 Alexei Starovoitov 2014-09-26 2190 license[sizeof(license) - 1] = 0;
09756af46893c1 Alexei Starovoitov 2014-09-26 2191
09756af46893c1 Alexei Starovoitov 2014-09-26 2192 /* eBPF programs must be GPL compatible to use GPL-ed functions */
09756af46893c1 Alexei Starovoitov 2014-09-26 2193 is_gpl = license_is_gpl_compatible(license);
09756af46893c1 Alexei Starovoitov 2014-09-26 2194
c04c0d2b968ac4 Alexei Starovoitov 2019-04-01 2195 if (attr->insn_cnt == 0 ||
2c78ee898d8f10 Alexei Starovoitov 2020-05-13 2196 attr->insn_cnt > (bpf_capable() ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS))
ef0915cacd04c9 Daniel Borkmann 2016-12-07 2197 return -E2BIG;
80b7d81912d807 Chenbo Feng 2017-05-31 2198 if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
80b7d81912d807 Chenbo Feng 2017-05-31 2199 type != BPF_PROG_TYPE_CGROUP_SKB &&
2c78ee898d8f10 Alexei Starovoitov 2020-05-13 2200 !bpf_capable())
2c78ee898d8f10 Alexei Starovoitov 2020-05-13 2201 return -EPERM;
2c78ee898d8f10 Alexei Starovoitov 2020-05-13 2202
b338cb921e6739 Maciej Żenczykowski 2020-06-20 2203 if (is_net_admin_prog_type(type) && !capable(CAP_NET_ADMIN) && !capable(CAP_SYS_ADMIN))
2c78ee898d8f10 Alexei Starovoitov 2020-05-13 2204 return -EPERM;
2c78ee898d8f10 Alexei Starovoitov 2020-05-13 2205 if (is_perfmon_prog_type(type) && !perfmon_capable())
1be7f75d1668d6 Alexei Starovoitov 2015-10-07 2206 return -EPERM;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2207 if (attr->kfunc_btf_fds_cnt > MAX_KFUNC_DESCS)
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2208 return -E2BIG;
1be7f75d1668d6 Alexei Starovoitov 2015-10-07 2209
290248a5b7d829 Andrii Nakryiko 2020-12-03 2210 /* attach_prog_fd/attach_btf_obj_fd can specify fd of either bpf_prog
290248a5b7d829 Andrii Nakryiko 2020-12-03 2211 * or btf, we need to check which one it is
290248a5b7d829 Andrii Nakryiko 2020-12-03 2212 */
290248a5b7d829 Andrii Nakryiko 2020-12-03 2213 if (attr->attach_prog_fd) {
290248a5b7d829 Andrii Nakryiko 2020-12-03 2214 dst_prog = bpf_prog_get(attr->attach_prog_fd);
290248a5b7d829 Andrii Nakryiko 2020-12-03 2215 if (IS_ERR(dst_prog)) {
290248a5b7d829 Andrii Nakryiko 2020-12-03 2216 dst_prog = NULL;
290248a5b7d829 Andrii Nakryiko 2020-12-03 2217 attach_btf = btf_get_by_fd(attr->attach_btf_obj_fd);
290248a5b7d829 Andrii Nakryiko 2020-12-03 2218 if (IS_ERR(attach_btf))
290248a5b7d829 Andrii Nakryiko 2020-12-03 2219 return -EINVAL;
290248a5b7d829 Andrii Nakryiko 2020-12-03 2220 if (!btf_is_kernel(attach_btf)) {
8bdd8e275ede97 Andrii Nakryiko 2020-12-07 2221 /* attaching through specifying bpf_prog's BTF
8bdd8e275ede97 Andrii Nakryiko 2020-12-07 2222 * objects directly might be supported eventually
8bdd8e275ede97 Andrii Nakryiko 2020-12-07 2223 */
290248a5b7d829 Andrii Nakryiko 2020-12-03 2224 btf_put(attach_btf);
8bdd8e275ede97 Andrii Nakryiko 2020-12-07 2225 return -ENOTSUPP;
290248a5b7d829 Andrii Nakryiko 2020-12-03 2226 }
290248a5b7d829 Andrii Nakryiko 2020-12-03 2227 }
290248a5b7d829 Andrii Nakryiko 2020-12-03 2228 } else if (attr->attach_btf_id) {
290248a5b7d829 Andrii Nakryiko 2020-12-03 2229 /* fall back to vmlinux BTF, if BTF type ID is specified */
290248a5b7d829 Andrii Nakryiko 2020-12-03 2230 attach_btf = bpf_get_btf_vmlinux();
290248a5b7d829 Andrii Nakryiko 2020-12-03 2231 if (IS_ERR(attach_btf))
290248a5b7d829 Andrii Nakryiko 2020-12-03 2232 return PTR_ERR(attach_btf);
290248a5b7d829 Andrii Nakryiko 2020-12-03 2233 if (!attach_btf)
290248a5b7d829 Andrii Nakryiko 2020-12-03 2234 return -EINVAL;
290248a5b7d829 Andrii Nakryiko 2020-12-03 2235 btf_get(attach_btf);
290248a5b7d829 Andrii Nakryiko 2020-12-03 2236 }
290248a5b7d829 Andrii Nakryiko 2020-12-03 2237
aac3fc320d9404 Andrey Ignatov 2018-03-30 2238 bpf_prog_load_fixup_attach_type(attr);
ccfe29eb29c2ed Alexei Starovoitov 2019-10-15 2239 if (bpf_prog_load_check_attach(type, attr->expected_attach_type,
290248a5b7d829 Andrii Nakryiko 2020-12-03 2240 attach_btf, attr->attach_btf_id,
290248a5b7d829 Andrii Nakryiko 2020-12-03 2241 dst_prog)) {
290248a5b7d829 Andrii Nakryiko 2020-12-03 2242 if (dst_prog)
290248a5b7d829 Andrii Nakryiko 2020-12-03 2243 bpf_prog_put(dst_prog);
290248a5b7d829 Andrii Nakryiko 2020-12-03 2244 if (attach_btf)
290248a5b7d829 Andrii Nakryiko 2020-12-03 2245 btf_put(attach_btf);
5e43f899b03a34 Andrey Ignatov 2018-03-30 2246 return -EINVAL;
290248a5b7d829 Andrii Nakryiko 2020-12-03 2247 }
5e43f899b03a34 Andrey Ignatov 2018-03-30 2248
09756af46893c1 Alexei Starovoitov 2014-09-26 2249 /* plain bpf_prog allocation */
09756af46893c1 Alexei Starovoitov 2014-09-26 2250 prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
290248a5b7d829 Andrii Nakryiko 2020-12-03 2251 if (!prog) {
290248a5b7d829 Andrii Nakryiko 2020-12-03 2252 if (dst_prog)
290248a5b7d829 Andrii Nakryiko 2020-12-03 2253 bpf_prog_put(dst_prog);
290248a5b7d829 Andrii Nakryiko 2020-12-03 2254 if (attach_btf)
290248a5b7d829 Andrii Nakryiko 2020-12-03 2255 btf_put(attach_btf);
09756af46893c1 Alexei Starovoitov 2014-09-26 2256 return -ENOMEM;
290248a5b7d829 Andrii Nakryiko 2020-12-03 2257 }
09756af46893c1 Alexei Starovoitov 2014-09-26 2258
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2259 if (attr->kfunc_btf_fds_cnt) {
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2260 struct bpf_kfunc_btf_tab *tab;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2261 int fds[MAX_KFUNC_DESCS], i;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2262 bpfptr_t kfunc_btf_fds;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2263 u32 kfunc_btf_size, n;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2264
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2265 kfunc_btf_size = min_t(u32, MAX_KFUNC_DESCS, attr->kfunc_btf_fds_cnt);
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2266 kfunc_btf_fds = make_bpfptr(attr->kfunc_btf_fds, uattr.is_kernel);
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2267
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2268 err = -EFAULT;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2269 if (copy_from_bpfptr(fds, kfunc_btf_fds, kfunc_btf_size * sizeof(int)))
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2270 goto free_prog;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2271
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2272 err = -ENOMEM;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2273
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2274 n = kfunc_btf_size;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2275 kfunc_btf_size *= sizeof(prog->aux->kfunc_btf_tab->btfs[0]);
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2276 kfunc_btf_size += sizeof(*prog->aux->kfunc_btf_tab);
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2277 prog->aux->kfunc_btf_tab = kzalloc(kfunc_btf_size, GFP_KERNEL);
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2278 if (!prog->aux->kfunc_btf_tab)
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2279 goto free_prog;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2280
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2281 tab = prog->aux->kfunc_btf_tab;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2282 for (i = 0; i < n; i++) {
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2283 struct btf_mod_pair *p;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2284 struct btf *mod_btf;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2285
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2286 mod_btf = btf_get_by_fd(fds[i]);
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2287 if (IS_ERR(mod_btf)) {
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2288 err = PTR_ERR(mod_btf);
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2289 goto free_prog;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2290 }
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2291 if (!btf_is_module(mod_btf)) {
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2292 err = -EINVAL;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2293 btf_put(mod_btf);
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2294 goto free_prog;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2295 }
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2296
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2297 p = &tab->btfs[tab->nr_btfs];
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2298 p->module = btf_try_get_module(mod_btf);
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2299 if (!p->module) {
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2300 btf_put(mod_btf);
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2301 goto free_prog;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2302 }
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2303 p->btf = mod_btf;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2304 tab->nr_btfs++;
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2305 }
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2306 }
e868250a992dc2 Kumar Kartikeya Dwivedi 2021-08-30 2307
5e43f899b03a34 Andrey Ignatov 2018-03-30 2308 prog->expected_attach_type = attr->expected_attach_type;
290248a5b7d829 Andrii Nakryiko 2020-12-03 2309 prog->aux->attach_btf = attach_btf;
ccfe29eb29c2ed Alexei Starovoitov 2019-10-15 2310 prog->aux->attach_btf_id = attr->attach_btf_id;
3aac1ead5eb6b7 Toke Høiland-Jørgensen 2020-09-29 2311 prog->aux->dst_prog = dst_prog;
9a18eedb145d08 Jakub Kicinski 2017-12-27 2312 prog->aux->offload_requested = !!attr->prog_ifindex;
1e6c62a8821557 Alexei Starovoitov 2020-08-27 2313 prog->aux->sleepable = attr->prog_flags & BPF_F_SLEEPABLE;
9a18eedb145d08 Jakub Kicinski 2017-12-27 2314
afdb09c720b62b Chenbo Feng 2017-10-18 2315 err = security_bpf_prog_alloc(prog->aux);
aaac3ba95e4c8b Alexei Starovoitov 2015-10-07 2316 if (err)
3ac1f01b43b6e2 Roman Gushchin 2020-12-01 2317 goto free_prog;
afdb09c720b62b Chenbo Feng 2017-10-18 2318
3ac1f01b43b6e2 Roman Gushchin 2020-12-01 2319 prog->aux->user = get_current_user();
09756af46893c1 Alexei Starovoitov 2014-09-26 2320 prog->len = attr->insn_cnt;
09756af46893c1 Alexei Starovoitov 2014-09-26 2321
09756af46893c1 Alexei Starovoitov 2014-09-26 2322 err = -EFAULT;
af2ac3e13e4575 Alexei Starovoitov 2021-05-13 2323 if (copy_from_bpfptr(prog->insns,
af2ac3e13e4575 Alexei Starovoitov 2021-05-13 2324 make_bpfptr(attr->insns, uattr.is_kernel),
aafe6ae9cee32d Daniel Borkmann 2016-12-18 2325 bpf_prog_insn_size(prog)) != 0)
3ac1f01b43b6e2 Roman Gushchin 2020-12-01 2326 goto free_prog_sec;
09756af46893c1 Alexei Starovoitov 2014-09-26 2327
09756af46893c1 Alexei Starovoitov 2014-09-26 2328 prog->orig_prog = NULL;
a91263d520246b Daniel Borkmann 2015-09-30 2329 prog->jited = 0;
09756af46893c1 Alexei Starovoitov 2014-09-26 2330
85192dbf4de087 Andrii Nakryiko 2019-11-17 2331 atomic64_set(&prog->aux->refcnt, 1);
a91263d520246b Daniel Borkmann 2015-09-30 2332 prog->gpl_compatible = is_gpl ? 1 : 0;
09756af46893c1 Alexei Starovoitov 2014-09-26 2333
9a18eedb145d08 Jakub Kicinski 2017-12-27 2334 if (bpf_prog_is_dev_bound(prog->aux)) {
ab3f0063c48c26 Jakub Kicinski 2017-11-03 2335 err = bpf_prog_offload_init(prog, attr);
ab3f0063c48c26 Jakub Kicinski 2017-11-03 2336 if (err)
3ac1f01b43b6e2 Roman Gushchin 2020-12-01 2337 goto free_prog_sec;
ab3f0063c48c26 Jakub Kicinski 2017-11-03 2338 }
ab3f0063c48c26 Jakub Kicinski 2017-11-03 2339
09756af46893c1 Alexei Starovoitov 2014-09-26 2340 /* find program type: socket_filter vs tracing_filter */
09756af46893c1 Alexei Starovoitov 2014-09-26 2341 err = find_prog_type(type, prog);
09756af46893c1 Alexei Starovoitov 2014-09-26 2342 if (err < 0)
3ac1f01b43b6e2 Roman Gushchin 2020-12-01 2343 goto free_prog_sec;
09756af46893c1 Alexei Starovoitov 2014-09-26 2344
9285ec4c8b61d4 Jason A. Donenfeld 2019-06-21 2345 prog->aux->load_time = ktime_get_boottime_ns();
8e7ae2518f5265 Martin KaFai Lau 2020-03-13 2346 err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name,
8e7ae2518f5265 Martin KaFai Lau 2020-03-13 2347 sizeof(attr->prog_name));
8e7ae2518f5265 Martin KaFai Lau 2020-03-13 2348 if (err < 0)
3ac1f01b43b6e2 Roman Gushchin 2020-12-01 2349 goto free_prog_sec;
cb4d2b3f03d8ee Martin KaFai Lau 2017-09-27 2350
09756af46893c1 Alexei Starovoitov 2014-09-26 2351 /* run eBPF verifier */
838e96904ff3fc Yonghong Song 2018-11-19 2352 err = bpf_check(&prog, attr, uattr);
09756af46893c1 Alexei Starovoitov 2014-09-26 2353 if (err < 0)
09756af46893c1 Alexei Starovoitov 2014-09-26 2354 goto free_used_maps;
09756af46893c1 Alexei Starovoitov 2014-09-26 2355
d1c55ab5e41fcd Daniel Borkmann 2016-05-13 2356 prog = bpf_prog_select_runtime(prog, &err);
04fd61ab36ec06 Alexei Starovoitov 2015-05-19 2357 if (err < 0)
04fd61ab36ec06 Alexei Starovoitov 2015-05-19 2358 goto free_used_maps;
09756af46893c1 Alexei Starovoitov 2014-09-26 2359
dc4bb0e2356149 Martin KaFai Lau 2017-06-05 2360 err = bpf_prog_alloc_id(prog);
dc4bb0e2356149 Martin KaFai Lau 2017-06-05 2361 if (err)
dc4bb0e2356149 Martin KaFai Lau 2017-06-05 2362 goto free_used_maps;
dc4bb0e2356149 Martin KaFai Lau 2017-06-05 2363
c751798aa224fa Daniel Borkmann 2019-08-23 2364 /* Upon success of bpf_prog_alloc_id(), the BPF prog is
c751798aa224fa Daniel Borkmann 2019-08-23 2365 * effectively publicly exposed. However, retrieving via
c751798aa224fa Daniel Borkmann 2019-08-23 2366 * bpf_prog_get_fd_by_id() will take another reference,
c751798aa224fa Daniel Borkmann 2019-08-23 2367 * therefore it cannot be gone underneath us.
c751798aa224fa Daniel Borkmann 2019-08-23 2368 *
c751798aa224fa Daniel Borkmann 2019-08-23 2369 * Only for the time /after/ successful bpf_prog_new_fd()
c751798aa224fa Daniel Borkmann 2019-08-23 2370 * and before returning to userspace, we might just hold
c751798aa224fa Daniel Borkmann 2019-08-23 2371 * one reference and any parallel close on that fd could
c751798aa224fa Daniel Borkmann 2019-08-23 2372 * rip everything out. Hence, below notifications must
c751798aa224fa Daniel Borkmann 2019-08-23 2373 * happen before bpf_prog_new_fd().
c751798aa224fa Daniel Borkmann 2019-08-23 2374 *
c751798aa224fa Daniel Borkmann 2019-08-23 2375 * Also, any failure handling from this point onwards must
c751798aa224fa Daniel Borkmann 2019-08-23 2376 * be using bpf_prog_put() given the program is exposed.
b16d9aa4c2b90a Martin KaFai Lau 2017-06-05 2377 */
74451e66d516c5 Daniel Borkmann 2017-02-16 2378 bpf_prog_kallsyms_add(prog);
6ee52e2a3fe4ea Song Liu 2019-01-17 2379 perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
bae141f54be83b Daniel Borkmann 2019-12-06 2380 bpf_audit_prog(prog, BPF_AUDIT_LOAD);
c751798aa224fa Daniel Borkmann 2019-08-23 2381
c751798aa224fa Daniel Borkmann 2019-08-23 2382 err = bpf_prog_new_fd(prog);
c751798aa224fa Daniel Borkmann 2019-08-23 2383 if (err < 0)
c751798aa224fa Daniel Borkmann 2019-08-23 2384 bpf_prog_put(prog);
09756af46893c1 Alexei Starovoitov 2014-09-26 2385 return err;
09756af46893c1 Alexei Starovoitov 2014-09-26 2386
09756af46893c1 Alexei Starovoitov 2014-09-26 2387 free_used_maps:
cd7455f1013ef9 Daniel Borkmann 2019-10-22 2388 /* In case we have subprogs, we need to wait for a grace
cd7455f1013ef9 Daniel Borkmann 2019-10-22 2389 * period before we can tear down JIT memory since symbols
cd7455f1013ef9 Daniel Borkmann 2019-10-22 2390 * are already exposed under kallsyms.
cd7455f1013ef9 Daniel Borkmann 2019-10-22 2391 */
cd7455f1013ef9 Daniel Borkmann 2019-10-22 2392 __bpf_prog_put_noref(prog, prog->aux->func_cnt);
cd7455f1013ef9 Daniel Borkmann 2019-10-22 2393 return err;
afdb09c720b62b Chenbo Feng 2017-10-18 2394 free_prog_sec:
3ac1f01b43b6e2 Roman Gushchin 2020-12-01 2395 free_uid(prog->aux->user);
afdb09c720b62b Chenbo Feng 2017-10-18 2396 security_bpf_prog_free(prog->aux);
3ac1f01b43b6e2 Roman Gushchin 2020-12-01 2397 free_prog:
22dc4a0f5ed11b Andrii Nakryiko 2020-12-03 2398 if (prog->aux->attach_btf)
22dc4a0f5ed11b Andrii Nakryiko 2020-12-03 2399 btf_put(prog->aux->attach_btf);
09756af46893c1 Alexei Starovoitov 2014-09-26 2400 bpf_prog_free(prog);
09756af46893c1 Alexei Starovoitov 2014-09-26 2401 return err;
09756af46893c1 Alexei Starovoitov 2014-09-26 @2402 }
09756af46893c1 Alexei Starovoitov 2014-09-26 2403
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org
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next prev parent reply other threads:[~2021-08-30 20:03 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-30 17:34 [PATCH bpf-next RFC v1 0/8] Support kernel module function calls from eBPF Kumar Kartikeya Dwivedi
2021-08-30 17:34 ` [PATCH bpf-next RFC v1 1/8] bpf: Introduce BPF support for kernel module function calls Kumar Kartikeya Dwivedi
2021-08-30 20:01 ` Alexei Starovoitov
2021-08-30 20:03 ` kernel test robot [this message]
2021-08-30 22:19 ` kernel test robot
2021-08-30 17:34 ` [PATCH bpf-next RFC v1 2/8] bpf: Be conservative during verification for invalid kfunc calls Kumar Kartikeya Dwivedi
2021-08-30 17:34 ` [PATCH bpf-next RFC v1 3/8] libbpf: Support kernel module function calls Kumar Kartikeya Dwivedi
2021-09-01 0:55 ` Andrii Nakryiko
2021-09-01 2:27 ` Kumar Kartikeya Dwivedi
2021-09-01 2:59 ` Alexei Starovoitov
2021-09-01 3:38 ` Andrii Nakryiko
2021-08-30 17:34 ` [PATCH bpf-next RFC v1 4/8] libbpf: Resolve invalid kfunc calls with imm = 0, off = 0 Kumar Kartikeya Dwivedi
2021-09-01 0:35 ` Andrii Nakryiko
2021-08-30 17:34 ` [PATCH bpf-next RFC v1 5/8] tools: Allow specifying base BTF file in resolve_btfids Kumar Kartikeya Dwivedi
2021-08-30 17:34 ` [PATCH bpf-next RFC v1 6/8] bpf: btf: Introduce helpers for dynamic BTF set registration Kumar Kartikeya Dwivedi
2021-08-30 17:34 ` [PATCH bpf-next RFC v1 7/8] bpf: enable TCP congestion control kfunc from modules Kumar Kartikeya Dwivedi
2021-08-31 0:16 ` kernel test robot
2021-09-01 0:48 ` Andrii Nakryiko
2021-08-30 17:34 ` [PATCH bpf-next RFC v1 8/8] bpf, selftests: Add basic test for module kfunc call Kumar Kartikeya Dwivedi
2021-08-30 20:07 ` Alexei Starovoitov
2021-09-01 1:16 [PATCH bpf-next RFC v1 1/8] bpf: Introduce BPF support for kernel module function calls kernel test robot
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