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bpf: btf: implement btf_name_valid_identifier()

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Function btf_name_valid_identifier() have been implemented in
bpf-next commit 2667a2626f ("bpf: btf: Add BTF_KIND_FUNC and
BTF_KIND_FUNC_PROTO"). Backport this function so later patch
can use it.

Fixes: 69b693f0ae ("bpf: btf: Introduce BPF Type Format (BTF)")
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song 2018-11-27 13:23:27 -08:00 committed by Alexei Starovoitov
parent d78a5ebd8b
commit cdbb096add
1 changed files with 25 additions and 0 deletions
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25
kernel/bpf/btf.c
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@ -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)