netdev - [PATCH bpf-next v2 3/7] bpf, obj: allow . char as part of the name

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Message-Id: <20190228231829.11993-4-daniel@iogearbox.net>
Date:   Fri,  1 Mar 2019 00:18:25 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     ast@...com
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, joe@...d.net.nz,
        john.fastabend@...il.com, tgraf@...g.ch, yhs@...com,
        andriin@...com, jakub.kicinski@...ronome.com, lmb@...udflare.com,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH bpf-next v2 3/7] bpf, obj: allow . char as part of the name

Trivial addition to allow '.' aside from '_' as "special" characters
in the object name. Used to name maps from loader side as ".bss",
".data", ".rodata".

Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
---
 kernel/bpf/syscall.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index d3ef45e01d7a..90044da3346e 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -440,10 +440,10 @@ static int bpf_obj_name_cpy(char *dst, const char *src)
 	const char *end = src + BPF_OBJ_NAME_LEN;
 
 	memset(dst, 0, BPF_OBJ_NAME_LEN);
-
-	/* Copy all isalnum() and '_' char */
+	/* Copy all isalnum(), '_' and '.' chars. */
 	while (src < end && *src) {
-		if (!isalnum(*src) && *src != '_')
+		if (!isalnum(*src) &&
+		    *src != '_' && *src != '.')
 			return -EINVAL;
 		*dst++ = *src++;
 	}
-- 
2.17.1