diff options
author | Mark Brown <broonie@kernel.org> | 2018-04-13 11:26:07 +0100 |
---|---|---|
committer | Mark Brown <broonie@kernel.org> | 2018-04-13 11:26:07 +0100 |
commit | 36e3dd72fb0d2c32f1ba1313d4da22fbb27b5bd4 (patch) | |
tree | 4db51d38820eb6883921fa88ff692bc4ca711300 /net/netfilter/x_tables.c | |
parent | 5e9e8b891fe489c9ac2270b6e4f2da961ae3c80c (diff) | |
parent | d32da5bd9fd2e6eafa25c82318b55124c54d3a66 (diff) |
Merge tag 'v4.9.93' into linux-linaro-lsk-v4.9
This is the 4.9.93 stable release
Diffstat (limited to 'net/netfilter/x_tables.c')
-rw-r--r-- | net/netfilter/x_tables.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c index 7ad1a863587a..59be89813a29 100644 --- a/net/netfilter/x_tables.c +++ b/net/netfilter/x_tables.c @@ -367,6 +367,36 @@ textify_hooks(char *buf, size_t size, unsigned int mask, uint8_t nfproto) return buf; } +/** + * xt_check_proc_name - check that name is suitable for /proc file creation + * + * @name: file name candidate + * @size: length of buffer + * + * some x_tables modules wish to create a file in /proc. + * This function makes sure that the name is suitable for this + * purpose, it checks that name is NUL terminated and isn't a 'special' + * name, like "..". + * + * returns negative number on error or 0 if name is useable. + */ +int xt_check_proc_name(const char *name, unsigned int size) +{ + if (name[0] == '\0') + return -EINVAL; + + if (strnlen(name, size) == size) + return -ENAMETOOLONG; + + if (strcmp(name, ".") == 0 || + strcmp(name, "..") == 0 || + strchr(name, '/')) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(xt_check_proc_name); + int xt_check_match(struct xt_mtchk_param *par, unsigned int size, u_int8_t proto, bool inv_proto) { |