In the next commit, it will be able to report logs via extended common attributes, which will report 'log_true_size' via the extended common attributes meanwhile.
Therefore, refactor the way of 'btf_log_true_size' reporting in order to report 'log_true_size' via the extended common attributes easily. Signed-off-by: Leon Hwang <[email protected]> --- include/linux/btf.h | 2 +- kernel/bpf/btf.c | 25 +++++-------------------- kernel/bpf/syscall.c | 19 ++++++++++++++++--- 3 files changed, 22 insertions(+), 24 deletions(-) diff --git a/include/linux/btf.h b/include/linux/btf.h index 691f09784933..2b27fdd567f5 100644 --- a/include/linux/btf.h +++ b/include/linux/btf.h @@ -144,7 +144,7 @@ const char *btf_get_name(const struct btf *btf); void btf_get(struct btf *btf); void btf_put(struct btf *btf); const struct btf_header *btf_header(const struct btf *btf); -int btf_new_fd(const union bpf_attr *attr, bpfptr_t uattr, u32 uattr_sz); +int btf_new_fd(union bpf_attr *attr, bpfptr_t uattr); struct btf *btf_get_by_fd(int fd); int btf_get_info_by_fd(const struct btf *btf, const union bpf_attr *attr, diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 539c9fdea41d..9efcbb489edb 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -5745,22 +5745,7 @@ static int btf_check_type_tags(struct btf_verifier_env *env, return 0; } -static int finalize_log(struct bpf_verifier_log *log, bpfptr_t uattr, u32 uattr_size) -{ - u32 log_true_size; - int err; - - err = bpf_vlog_finalize(log, &log_true_size); - - if (uattr_size >= offsetofend(union bpf_attr, btf_log_true_size) && - copy_to_bpfptr_offset(uattr, offsetof(union bpf_attr, btf_log_true_size), - &log_true_size, sizeof(log_true_size))) - err = -EFAULT; - - return err; -} - -static struct btf *btf_parse(const union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size) +static struct btf *btf_parse(union bpf_attr *attr, bpfptr_t uattr) { bpfptr_t btf_data = make_bpfptr(attr->btf, uattr.is_kernel); char __user *log_ubuf = u64_to_user_ptr(attr->btf_log_buf); @@ -5841,7 +5826,7 @@ static struct btf *btf_parse(const union bpf_attr *attr, bpfptr_t uattr, u32 uat } } - err = finalize_log(&env->log, uattr, uattr_size); + err = bpf_vlog_finalize(&env->log, &attr->btf_log_true_size); if (err) goto errout_free; @@ -5853,7 +5838,7 @@ static struct btf *btf_parse(const union bpf_attr *attr, bpfptr_t uattr, u32 uat btf_free_struct_meta_tab(btf); errout: /* overwrite err with -ENOSPC or -EFAULT */ - ret = finalize_log(&env->log, uattr, uattr_size); + ret = bpf_vlog_finalize(&env->log, &attr->btf_log_true_size); if (ret) err = ret; errout_free: @@ -8017,12 +8002,12 @@ static int __btf_new_fd(struct btf *btf) return anon_inode_getfd("btf", &btf_fops, btf, O_RDONLY | O_CLOEXEC); } -int btf_new_fd(const union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size) +int btf_new_fd(union bpf_attr *attr, bpfptr_t uattr) { struct btf *btf; int ret; - btf = btf_parse(attr, uattr, uattr_size); + btf = btf_parse(attr, uattr); if (IS_ERR(btf)) return PTR_ERR(btf); diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index ad565f569a4f..ce349a059d5d 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -5422,7 +5422,7 @@ static int bpf_obj_get_info_by_fd(const union bpf_attr *attr, #define BPF_BTF_LOAD_LAST_FIELD btf_token_fd -static int bpf_btf_load(const union bpf_attr *attr, bpfptr_t uattr, __u32 uattr_size) +static int bpf_btf_load(union bpf_attr *attr, bpfptr_t uattr) { struct bpf_token *token = NULL; @@ -5449,7 +5449,7 @@ static int bpf_btf_load(const union bpf_attr *attr, bpfptr_t uattr, __u32 uattr_ bpf_token_put(token); - return btf_new_fd(attr, uattr, uattr_size); + return btf_new_fd(attr, uattr); } #define BPF_BTF_GET_FD_BY_ID_LAST_FIELD fd_by_id_token_fd @@ -6211,6 +6211,16 @@ static int copy_prog_load_log_true_size(union bpf_attr *attr, bpfptr_t uattr, un &attr->log_true_size); } +static int copy_btf_load_log_true_size(union bpf_attr *attr, bpfptr_t uattr, unsigned int size) +{ + if (size >= offsetofend(union bpf_attr, btf_log_true_size) && + copy_to_bpfptr_offset(uattr, offsetof(union bpf_attr, btf_log_true_size), + &attr->btf_log_true_size, sizeof(attr->btf_log_true_size))) + return -EFAULT; + + return 0; +} + static int __sys_bpf(enum bpf_cmd cmd, bpfptr_t uattr, unsigned int size, bpfptr_t uattr_common, unsigned int size_common) { @@ -6318,7 +6328,10 @@ static int __sys_bpf(enum bpf_cmd cmd, bpfptr_t uattr, unsigned int size, err = bpf_raw_tracepoint_open(&attr); break; case BPF_BTF_LOAD: - err = bpf_btf_load(&attr, uattr, size); + attr.btf_log_true_size = 0; + err = bpf_btf_load(&attr, uattr); + ret = copy_btf_load_log_true_size(&attr, uattr, size); + err = ret ? ret : err; break; case BPF_BTF_GET_FD_BY_ID: err = bpf_btf_get_fd_by_id(&attr); -- 2.52.0
