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bpf: libbpf: retry loading program on EAGAIN 

Commit c3494801cd ("bpf: check pending signals while
verifying programs") makes it possible for the BPF_PROG_LOAD
to fail with EAGAIN. Retry unconditionally in this case.

Fixes: c3494801cd ("bpf: check pending signals while verifying programs")
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Lorenz Bauer 2019-01-08 13:58:00 +00:00 committed by Daniel Borkmann
parent 6bf3bbe1f4
commit 86edaed379
1 changed files with 15 additions and 4 deletions
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19
tools/lib/bpf/bpf.c
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@ -65,6 +65,17 @@ static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
return syscall(__NR_bpf, cmd, attr, size);
}
static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size)
{
int fd;
do {
fd = sys_bpf(BPF_PROG_LOAD, attr, size);
} while (fd < 0 && errno == EAGAIN);
return fd;
}
int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
{
__u32 name_len = create_attr->name ? strlen(create_attr->name) : 0;
@ -232,7 +243,7 @@ int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
memcpy(attr.prog_name, load_attr->name,
min(name_len, BPF_OBJ_NAME_LEN - 1));
fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
fd = sys_bpf_prog_load(&attr, sizeof(attr));
if (fd >= 0)
return fd;
@ -269,7 +280,7 @@ int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
break;
}
fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
fd = sys_bpf_prog_load(&attr, sizeof(attr));
if (fd >= 0)
goto done;
@ -283,7 +294,7 @@ int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
attr.log_size = log_buf_sz;
attr.log_level = 1;
log_buf[0] = 0;
fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
fd = sys_bpf_prog_load(&attr, sizeof(attr));
done:
free(finfo);
free(linfo);
@ -328,7 +339,7 @@ int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
attr.kern_version = kern_version;
attr.prog_flags = prog_flags;
return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
return sys_bpf_prog_load(&attr, sizeof(attr));
}
int bpf_map_update_elem(int fd, const void *key, const void *value,