netdev - [PATCH bpf-next v4 05/16] bpf: allow . char as part of the object name

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Message-Id: <8d3722221004bafe57fcb06d1d5c8e78690c5e07.1554497408.git.daniel@iogearbox.net>
Date:   Fri,  5 Apr 2019 22:59:31 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, ast@...nel.org, joe@...d.net.nz,
        yhs@...com, andrii.nakryiko@...il.com, kafai@...com,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH bpf-next v4 05/16] bpf: allow . char as part of the object name

Trivial addition to allow '.' aside from '_' as "special" characters
in the object name. Used to allow for substrings in maps from loader
side such as ".bss", ".data", ".rodata", but could also be useful for
other purposes.

Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Acked-by: Andrii Nakryiko <andriin@...com>
---
 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 8b00ee3..7bac02b 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -474,10 +474,10 @@ 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++;
 	}
-- 
2.9.5