korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-26 05:34:13 +08:00
Code Issues Packages Projects Releases Wiki Activity

libbpf: Preserve kernel error code and remove kprobe prog type guessing

Browse Source 
Instead of rewriting error code returned by the kernel of prog load with
libbpf-sepcific variants pass through the original error.

There is now also no need to have a backup generic -LIBBPF_ERRNO__LOAD
fallback error as bpf_prog_load() guarantees that errno will be properly
set no matter what.

Also drop a completely outdated and pretty useless BPF_PROG_TYPE_KPROBE
guess logic. It's not necessary and neither it's helpful in modern BPF
applications.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211209193840.1248570-7-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2021-12-09 11:38:34 -08:00
parent ad9a7f9644
commit 2eda2145eb
1 changed files with 2 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
tools/lib/bpf/libbpf.c
View File

@ -6696,34 +6696,19 @@ retry_load:
free(log_buf);
goto retry_load;
}
ret = errno ? -errno : -LIBBPF_ERRNO__LOAD;
ret = -errno;
cp = libbpf_strerror_r(errno, errmsg, sizeof(errmsg));
pr_warn("prog '%s': BPF program load failed: %s\n", prog->name, cp);
pr_perm_msg(ret);
if (log_buf && log_buf[0] != '\0') {
ret = -LIBBPF_ERRNO__VERIFY;
pr_warn("prog '%s': -- BEGIN PROG LOAD LOG --\n%s-- END PROG LOAD LOG --\n",
prog->name, log_buf);
}
if (insns_cnt >= BPF_MAXINSNS) {
pr_warn("prog '%s': program too large (%d insns), at most %d insns\n",
prog->name, insns_cnt, BPF_MAXINSNS);
ret = -LIBBPF_ERRNO__PROG2BIG;
} else if (prog->type != BPF_PROG_TYPE_KPROBE) {
/* Wrong program type? */
int fd;
load_attr.expected_attach_type = 0;
load_attr.log_buf = NULL;
load_attr.log_size = 0;
fd = bpf_prog_load(BPF_PROG_TYPE_KPROBE, prog_name, license,
insns, insns_cnt, &load_attr);
if (fd >= 0) {
close(fd);
ret = -LIBBPF_ERRNO__PROGTYPE;
goto out;
}
}
out: