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Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

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Daniel Borkmann says:

====================
pull-request: bpf 2019-08-11

The following pull-request contains BPF updates for your *net* tree.

The main changes are:

1) x64 JIT code generation fix for backward-jumps to 1st insn, from Alexei.

2) Fix buggy multi-closing of BTF file descriptor in libbpf, from Andrii.

3) Fix libbpf_num_possible_cpus() to make it thread safe, from Takshak.

4) Fix bpftool to dump an error if pinning fails, from Jakub.
====================

Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David S. Miller 2019-08-11 14:49:34 -07:00
commit 9481382b36
4 changed files with 57 additions and 21 deletions
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33
tools/lib/bpf/libbpf.c
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@ -182,7 +182,6 @@ struct bpf_program {
bpf_program_clear_priv_t clear_priv;
enum bpf_attach_type expected_attach_type;
int btf_fd;
void *func_info;
__u32 func_info_rec_size;
__u32 func_info_cnt;
@ -313,7 +312,6 @@ void bpf_program__unload(struct bpf_program *prog)
prog->instances.nr = -1;
zfree(&prog->instances.fds);
zclose(prog->btf_fd);
zfree(&prog->func_info);
zfree(&prog->line_info);
}
@ -392,7 +390,6 @@ bpf_program__init(void *data, size_t size, char *section_name, int idx,
prog->instances.fds = NULL;
prog->instances.nr = -1;
prog->type = BPF_PROG_TYPE_UNSPEC;
prog->btf_fd = -1;
return 0;
errout:
@ -2288,9 +2285,6 @@ bpf_program_reloc_btf_ext(struct bpf_program *prog, struct bpf_object *obj,
prog->line_info_rec_size = btf_ext__line_info_rec_size(obj->btf_ext);
}
if (!insn_offset)
prog->btf_fd = btf__fd(obj->btf);
return 0;
}
@ -2463,7 +2457,7 @@ load_program(struct bpf_program *prog, struct bpf_insn *insns, int insns_cnt,
char *cp, errmsg[STRERR_BUFSIZE];
int log_buf_size = BPF_LOG_BUF_SIZE;
char *log_buf;
int ret;
int btf_fd, ret;
if (!insns || !insns_cnt)
return -EINVAL;
@ -2478,7 +2472,12 @@ load_program(struct bpf_program *prog, struct bpf_insn *insns, int insns_cnt,
load_attr.license = license;
load_attr.kern_version = kern_version;
load_attr.prog_ifindex = prog->prog_ifindex;
load_attr.prog_btf_fd = prog->btf_fd >= 0 ? prog->btf_fd : 0;
/* if .BTF.ext was loaded, kernel supports associated BTF for prog */
if (prog->obj->btf_ext)
btf_fd = bpf_object__btf_fd(prog->obj);
else
btf_fd = -1;
load_attr.prog_btf_fd = btf_fd >= 0 ? btf_fd : 0;
load_attr.func_info = prog->func_info;
load_attr.func_info_rec_size = prog->func_info_rec_size;
load_attr.func_info_cnt = prog->func_info_cnt;
@ -5000,13 +4999,15 @@ int libbpf_num_possible_cpus(void)
static const char *fcpu = "/sys/devices/system/cpu/possible";
int len = 0, n = 0, il = 0, ir = 0;
unsigned int start = 0, end = 0;
int tmp_cpus = 0;
static int cpus;
char buf[128];
int error = 0;
int fd = -1;
if (cpus > 0)
return cpus;
tmp_cpus = READ_ONCE(cpus);
if (tmp_cpus > 0)
return tmp_cpus;
fd = open(fcpu, O_RDONLY);
if (fd < 0) {
@ -5029,7 +5030,7 @@ int libbpf_num_possible_cpus(void)
}
buf[len] = '\0';
for (ir = 0, cpus = 0; ir <= len; ir++) {
for (ir = 0, tmp_cpus = 0; ir <= len; ir++) {
/* Each sub string separated by ',' has format \d+-\d+ or \d+ */
if (buf[ir] == ',' || buf[ir] == '\0') {
buf[ir] = '\0';
@ -5041,13 +5042,15 @@ int libbpf_num_possible_cpus(void)
} else if (n == 1) {
end = start;
}
cpus += end - start + 1;
tmp_cpus += end - start + 1;
il = ir + 1;
}
}
if (cpus <= 0) {
pr_warning("Invalid #CPUs %d from %s\n", cpus, fcpu);
if (tmp_cpus <= 0) {
pr_warning("Invalid #CPUs %d from %s\n", tmp_cpus, fcpu);
return -EINVAL;
}
return cpus;
WRITE_ONCE(cpus, tmp_cpus);
return tmp_cpus;
}