[PATCH net] cfg80211: fix callback type mismatches in wext-compat

From: Sami Tolvanen
Date: Tue Nov 17 2020 - 15:59:54 EST

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Instead of casting callback functions to type iw_handler, which trips
indirect call checking with Clang's Control-Flow Integrity (CFI), add
stub functions with the correct function type for the callbacks.

Reported-by: Sedat Dilek <sedat.dilek@xxxxxxxxx>
Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
---
net/wireless/wext-compat.c | 103 +++++++++++++++++++++++++------------
1 file changed, 71 insertions(+), 32 deletions(-)

diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index 78f2927ead7f..cf54c6e5b397 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -1472,39 +1472,78 @@ static int cfg80211_wext_siwpmksa(struct net_device *dev,
}
}

+#define DEFINE_WEXT_COMPAT_STUB(func, type) \
+ static int __ ## func(struct net_device *dev, \
+ struct iw_request_info *info, \
+ union iwreq_data *wrqu, \
+ char *extra) \
+ { \
+ return func(dev, info, (type *)wrqu, extra); \
+ }
+
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwname, char)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwfreq, struct iw_freq)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwfreq, struct iw_freq)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwmode, u32)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwmode, u32)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwrange, struct iw_point)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwap, struct sockaddr)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwap, struct sockaddr)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwmlme, struct iw_point)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwscan, struct iw_point)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwessid, struct iw_point)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwessid, struct iw_point)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwrate, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwrate, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwrts, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwrts, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwfrag, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwfrag, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwretry, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwretry, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwencode, struct iw_point)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwencode, struct iw_point)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwpower, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwpower, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwgenie, struct iw_point)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwauth, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwauth, struct iw_param)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwencodeext, struct iw_point)
+DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwpmksa, struct iw_point)
+
static const iw_handler cfg80211_handlers[] = {
- [IW_IOCTL_IDX(SIOCGIWNAME)] = (iw_handler) cfg80211_wext_giwname,
- [IW_IOCTL_IDX(SIOCSIWFREQ)] = (iw_handler) cfg80211_wext_siwfreq,
- [IW_IOCTL_IDX(SIOCGIWFREQ)] = (iw_handler) cfg80211_wext_giwfreq,
- [IW_IOCTL_IDX(SIOCSIWMODE)] = (iw_handler) cfg80211_wext_siwmode,
- [IW_IOCTL_IDX(SIOCGIWMODE)] = (iw_handler) cfg80211_wext_giwmode,
- [IW_IOCTL_IDX(SIOCGIWRANGE)] = (iw_handler) cfg80211_wext_giwrange,
- [IW_IOCTL_IDX(SIOCSIWAP)] = (iw_handler) cfg80211_wext_siwap,
- [IW_IOCTL_IDX(SIOCGIWAP)] = (iw_handler) cfg80211_wext_giwap,
- [IW_IOCTL_IDX(SIOCSIWMLME)] = (iw_handler) cfg80211_wext_siwmlme,
- [IW_IOCTL_IDX(SIOCSIWSCAN)] = (iw_handler) cfg80211_wext_siwscan,
- [IW_IOCTL_IDX(SIOCGIWSCAN)] = (iw_handler) cfg80211_wext_giwscan,
- [IW_IOCTL_IDX(SIOCSIWESSID)] = (iw_handler) cfg80211_wext_siwessid,
- [IW_IOCTL_IDX(SIOCGIWESSID)] = (iw_handler) cfg80211_wext_giwessid,
- [IW_IOCTL_IDX(SIOCSIWRATE)] = (iw_handler) cfg80211_wext_siwrate,
- [IW_IOCTL_IDX(SIOCGIWRATE)] = (iw_handler) cfg80211_wext_giwrate,
- [IW_IOCTL_IDX(SIOCSIWRTS)] = (iw_handler) cfg80211_wext_siwrts,
- [IW_IOCTL_IDX(SIOCGIWRTS)] = (iw_handler) cfg80211_wext_giwrts,
- [IW_IOCTL_IDX(SIOCSIWFRAG)] = (iw_handler) cfg80211_wext_siwfrag,
- [IW_IOCTL_IDX(SIOCGIWFRAG)] = (iw_handler) cfg80211_wext_giwfrag,
- [IW_IOCTL_IDX(SIOCSIWTXPOW)] = (iw_handler) cfg80211_wext_siwtxpower,
- [IW_IOCTL_IDX(SIOCGIWTXPOW)] = (iw_handler) cfg80211_wext_giwtxpower,
- [IW_IOCTL_IDX(SIOCSIWRETRY)] = (iw_handler) cfg80211_wext_siwretry,
- [IW_IOCTL_IDX(SIOCGIWRETRY)] = (iw_handler) cfg80211_wext_giwretry,
- [IW_IOCTL_IDX(SIOCSIWENCODE)] = (iw_handler) cfg80211_wext_siwencode,
- [IW_IOCTL_IDX(SIOCGIWENCODE)] = (iw_handler) cfg80211_wext_giwencode,
- [IW_IOCTL_IDX(SIOCSIWPOWER)] = (iw_handler) cfg80211_wext_siwpower,
- [IW_IOCTL_IDX(SIOCGIWPOWER)] = (iw_handler) cfg80211_wext_giwpower,
- [IW_IOCTL_IDX(SIOCSIWGENIE)] = (iw_handler) cfg80211_wext_siwgenie,
- [IW_IOCTL_IDX(SIOCSIWAUTH)] = (iw_handler) cfg80211_wext_siwauth,
- [IW_IOCTL_IDX(SIOCGIWAUTH)] = (iw_handler) cfg80211_wext_giwauth,
- [IW_IOCTL_IDX(SIOCSIWENCODEEXT)]= (iw_handler) cfg80211_wext_siwencodeext,
- [IW_IOCTL_IDX(SIOCSIWPMKSA)] = (iw_handler) cfg80211_wext_siwpmksa,
+ [IW_IOCTL_IDX(SIOCGIWNAME)] = __cfg80211_wext_giwname,
+ [IW_IOCTL_IDX(SIOCSIWFREQ)] = __cfg80211_wext_siwfreq,
+ [IW_IOCTL_IDX(SIOCGIWFREQ)] = __cfg80211_wext_giwfreq,
+ [IW_IOCTL_IDX(SIOCSIWMODE)] = __cfg80211_wext_siwmode,
+ [IW_IOCTL_IDX(SIOCGIWMODE)] = __cfg80211_wext_giwmode,
+ [IW_IOCTL_IDX(SIOCGIWRANGE)] = __cfg80211_wext_giwrange,
+ [IW_IOCTL_IDX(SIOCSIWAP)] = __cfg80211_wext_siwap,
+ [IW_IOCTL_IDX(SIOCGIWAP)] = __cfg80211_wext_giwap,
+ [IW_IOCTL_IDX(SIOCSIWMLME)] = __cfg80211_wext_siwmlme,
+ [IW_IOCTL_IDX(SIOCSIWSCAN)] = cfg80211_wext_siwscan,
+ [IW_IOCTL_IDX(SIOCGIWSCAN)] = __cfg80211_wext_giwscan,
+ [IW_IOCTL_IDX(SIOCSIWESSID)] = __cfg80211_wext_siwessid,
+ [IW_IOCTL_IDX(SIOCGIWESSID)] = __cfg80211_wext_giwessid,
+ [IW_IOCTL_IDX(SIOCSIWRATE)] = __cfg80211_wext_siwrate,
+ [IW_IOCTL_IDX(SIOCGIWRATE)] = __cfg80211_wext_giwrate,
+ [IW_IOCTL_IDX(SIOCSIWRTS)] = __cfg80211_wext_siwrts,
+ [IW_IOCTL_IDX(SIOCGIWRTS)] = __cfg80211_wext_giwrts,
+ [IW_IOCTL_IDX(SIOCSIWFRAG)] = __cfg80211_wext_siwfrag,
+ [IW_IOCTL_IDX(SIOCGIWFRAG)] = __cfg80211_wext_giwfrag,
+ [IW_IOCTL_IDX(SIOCSIWTXPOW)] = cfg80211_wext_siwtxpower,
+ [IW_IOCTL_IDX(SIOCGIWTXPOW)] = cfg80211_wext_giwtxpower,
+ [IW_IOCTL_IDX(SIOCSIWRETRY)] = __cfg80211_wext_siwretry,
+ [IW_IOCTL_IDX(SIOCGIWRETRY)] = __cfg80211_wext_giwretry,
+ [IW_IOCTL_IDX(SIOCSIWENCODE)] = __cfg80211_wext_siwencode,
+ [IW_IOCTL_IDX(SIOCGIWENCODE)] = __cfg80211_wext_giwencode,
+ [IW_IOCTL_IDX(SIOCSIWPOWER)] = __cfg80211_wext_siwpower,
+ [IW_IOCTL_IDX(SIOCGIWPOWER)] = __cfg80211_wext_giwpower,
+ [IW_IOCTL_IDX(SIOCSIWGENIE)] = __cfg80211_wext_siwgenie,
+ [IW_IOCTL_IDX(SIOCSIWAUTH)] = __cfg80211_wext_siwauth,
+ [IW_IOCTL_IDX(SIOCGIWAUTH)] = __cfg80211_wext_giwauth,
+ [IW_IOCTL_IDX(SIOCSIWENCODEEXT)]= __cfg80211_wext_siwencodeext,
+ [IW_IOCTL_IDX(SIOCSIWPMKSA)] = __cfg80211_wext_siwpmksa,
};

const struct iw_handler_def cfg80211_wext_handler = {

base-commit: 9c87c9f41245baa3fc4716cf39141439cf405b01
--
2.29.2.299.gdc1121823c-goog

Next message: Kees Cook: "[PATCH] selftests/seccomp: powerpc: Fix typo in macro variable name"
Previous message: Linus Walleij: "Re: [PATCH v2 2/4] gpio: visoconti: Add Toshiba Visconti GPIO support"
Next in thread: Kees Cook: "Re: [PATCH net] cfg80211: fix callback type mismatches in wext-compat"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]