提交 52b4947b 编写于 作者: L Lorenz Bauer 提交者: Greg Kroah-Hartman

bpf: libbpf: retry loading program on EAGAIN

[ Upstream commit 86edaed379632e216a97e6bcef9f498b64522d50 ]

Commit c3494801cd17 ("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: c3494801cd17 ("bpf: check pending signals while verifying programs")
Signed-off-by: NLorenz Bauer <lmb@cloudflare.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: NSasha Levin <sashal@kernel.org>
上级 a935d78e
......@@ -75,6 +75,17 @@ 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;
......@@ -218,7 +229,7 @@ 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 || !log_buf || !log_buf_sz)
return fd;
......@@ -227,7 +238,7 @@ 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;
return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
return sys_bpf_prog_load(&attr, sizeof(attr));
}
int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
......@@ -268,7 +279,7 @@ int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
attr.kern_version = kern_version;
attr.prog_flags = strict_alignment ? BPF_F_STRICT_ALIGNMENT : 0;
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,
......
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