This is a note to let you know that I've just added the patch titled

netfilter: x_tables: add and use xt_check_proc_name

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: netfilter-x_tables-add-and-use-xt_check_proc_name.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From b1d0a5d0cba4597c0394997b2d5fced3e3841b4e Mon Sep 17 00:00:00 2001

From: Florian Westphal fw@strlen.de Date: Sat, 10 Mar 2018 01:15:45 +0100 Subject: netfilter: x_tables: add and use xt_check_proc_name

From: Florian Westphal fw@strlen.de

commit b1d0a5d0cba4597c0394997b2d5fced3e3841b4e upstream.

recent and hashlimit both create /proc files, but only check that name is 0 terminated.

This can trigger WARN() from procfs when name is "" or "/". Add helper for this and then use it for both.

Cc: Eric Dumazet eric.dumazet@gmail.com Reported-by: Eric Dumazet eric.dumazet@gmail.com Reported-by: syzbot+0502b00edac2a0680b61@syzkaller.appspotmail.com Signed-off-by: Florian Westphal fw@strlen.de Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- include/linux/netfilter/x_tables.h | 2 ++ net/netfilter/x_tables.c | 30 ++++++++++++++++++++++++++++++ net/netfilter/xt_hashlimit.c | 16 ++++++++++------ net/netfilter/xt_recent.c | 6 +++--- 4 files changed, 45 insertions(+), 9 deletions(-)

--- a/include/linux/netfilter/x_tables.h +++ b/include/linux/netfilter/x_tables.h @@ -285,6 +285,8 @@ unsigned int *xt_alloc_entry_offsets(uns bool xt_find_jump_offset(const unsigned int *offsets, unsigned int target, unsigned int size);

+int xt_check_proc_name(const char *name, unsigned int size); + int xt_check_match(struct xt_mtchk_param *, unsigned int size, u_int8_t proto, bool inv_proto); int xt_check_target(struct xt_tgchk_param *, unsigned int size, u_int8_t proto, --- a/net/netfilter/x_tables.c +++ b/net/netfilter/x_tables.c @@ -423,6 +423,36 @@ textify_hooks(char *buf, size_t size, un 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) { --- a/net/netfilter/xt_hashlimit.c +++ b/net/netfilter/xt_hashlimit.c @@ -915,8 +915,9 @@ static int hashlimit_mt_check_v1(const s struct hashlimit_cfg3 cfg = {}; int ret;

- if (info->name[sizeof(info->name) - 1] != '\0') - return -EINVAL; + ret = xt_check_proc_name(info->name, sizeof(info->name)); + if (ret) + return ret;

ret = cfg_copy(&cfg, (void *)&info->cfg, 1);

@@ -933,8 +934,9 @@ static int hashlimit_mt_check_v2(const s struct hashlimit_cfg3 cfg = {}; int ret;

- if (info->name[sizeof(info->name) - 1] != '\0') - return -EINVAL; + ret = xt_check_proc_name(info->name, sizeof(info->name)); + if (ret) + return ret;

ret = cfg_copy(&cfg, (void *)&info->cfg, 2);

@@ -948,9 +950,11 @@ static int hashlimit_mt_check_v2(const s static int hashlimit_mt_check(const struct xt_mtchk_param *par) { struct xt_hashlimit_mtinfo3 *info = par->matchinfo; + int ret;

- if (info->name[sizeof(info->name) - 1] != '\0') - return -EINVAL; + ret = xt_check_proc_name(info->name, sizeof(info->name)); + if (ret) + return ret;

return hashlimit_mt_check_common(par, &info->hinfo, &info->cfg, info->name, 3); --- a/net/netfilter/xt_recent.c +++ b/net/netfilter/xt_recent.c @@ -361,9 +361,9 @@ static int recent_mt_check(const struct info->hit_count, XT_RECENT_MAX_NSTAMPS - 1); return -EINVAL; } - if (info->name[0] == '\0' || - strnlen(info->name, XT_RECENT_NAME_LEN) == XT_RECENT_NAME_LEN) - return -EINVAL; + ret = xt_check_proc_name(info->name, sizeof(info->name)); + if (ret) + return ret;

if (ip_pkt_list_tot && info->hit_count < ip_pkt_list_tot) nstamp_mask = roundup_pow_of_two(ip_pkt_list_tot) - 1;

Patches currently in stable-queue which might be from fw@strlen.de are

queue-4.15/netfilter-x_tables-add-and-use-xt_check_proc_name.patch queue-4.15/xfrm_user-uncoditionally-validate-esn-replay-attribute-struct.patch queue-4.15/netfilter-x_tables-make-allocation-less-aggressive.patch queue-4.15/netfilter-bridge-ebt_among-add-more-missing-match-size-checks.patch queue-4.15/netfilter-drop-template-ct-when-conntrack-is-skipped.patch