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socket-util: refuse "all" and "default" as valid ifnames

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Let's avoid collisions with special sysctls.
This commit is contained in:
Lennart Poettering 2021-03-05 20:33:15 +01:00 committed by Yu Watanabe
parent 5d5b6442a2
commit 07a7441a1c
1 changed files with 5 additions and 0 deletions
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5
src/basic/socket-util.c
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@ -736,6 +736,11 @@ bool ifname_valid_full(const char *p, IfnameValidFlags flags) {
if (dot_or_dot_dot(p))
return false;
/* Let's refuse "all" and "default" as interface name, to avoid collisions with the special sysctl
* directories /proc/sys/net/{ipv4,ipv6}/conf/{all,default} */
if (STR_IN_SET(p, "all", "default"))
return false;
for (const char *t = p; *t; t++) {
if ((unsigned char) *t >= 127U)
return false;