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| author | Yonghong Song <yhs@fb.com> | 2018-11-27 13:23:27 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-11-28 16:03:04 -0800 |
| commit | cdbb096adddb3f42584cecb5ec2e07c26815b71f (patch) | |
| tree | 243da00dbf1e26822b5f048c9eb6af71fa0946ce /kernel/bpf | |
| parent | d78a5ebd8b18d3809fd9d6bbaeb64d78a332204f (diff) | |
| download | linux-cdbb096adddb3f42584cecb5ec2e07c26815b71f.tar.bz2 | |
bpf: btf: implement btf_name_valid_identifier()
Function btf_name_valid_identifier() have been implemented in
bpf-next commit 2667a2626f4d ("bpf: btf: Add BTF_KIND_FUNC and
BTF_KIND_FUNC_PROTO"). Backport this function so later patch
can use it.
Fixes: 69b693f0aefa ("bpf: btf: Introduce BPF Type Format (BTF)")
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf')
| -rw-r--r-- | kernel/bpf/btf.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index ee4c82667d65..93c233ab2db6 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -5,6 +5,7 @@ #include <uapi/linux/types.h> #include <linux/seq_file.h> #include <linux/compiler.h> +#include <linux/ctype.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/anon_inodes.h> @@ -426,6 +427,30 @@ static bool btf_name_offset_valid(const struct btf *btf, u32 offset) offset < btf->hdr.str_len; } +/* Only C-style identifier is permitted. This can be relaxed if + * necessary. + */ +static bool btf_name_valid_identifier(const struct btf *btf, u32 offset) +{ + /* offset must be valid */ + const char *src = &btf->strings[offset]; + const char *src_limit; + + if (!isalpha(*src) && *src != '_') + return false; + + /* set a limit on identifier length */ + src_limit = src + KSYM_NAME_LEN; + src++; + while (*src && src < src_limit) { + if (!isalnum(*src) && *src != '_') + return false; + src++; + } + + return !*src; +} + static const char *btf_name_by_offset(const struct btf *btf, u32 offset) { if (!offset) |