diff options
Diffstat (limited to 'libbb/die_if_bad_username.c')
| -rw-r--r-- | libbb/die_if_bad_username.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/libbb/die_if_bad_username.c b/libbb/die_if_bad_username.c index c1641d376..8b4deec29 100644 --- a/libbb/die_if_bad_username.c +++ b/libbb/die_if_bad_username.c @@ -18,16 +18,20 @@ void FAST_FUNC die_if_bad_username(const char *name) { - goto skip; /* 1st char being dash isn't valid */ + /* 1st char being dash or dot isn't valid: */ + goto skip; + /* For example, name like ".." can make adduser + * chown "/home/.." recursively - NOT GOOD + */ + do { - if (*name == '-') + if (*name == '-' || *name == '.') continue; skip: if (isalnum(*name) || *name == '_' - || *name == '.' || *name == '@' - || (*name == '$' && !*(name + 1)) + || (*name == '$' && !name[1]) ) { continue; } |