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authorJohannes Berg <johannes@sipsolutions.net>2008-04-04 23:33:37 +0200
committerJohn W. Linville <linville@tuxdriver.com>2008-04-08 16:44:43 -0400
commitbebb8a5e2cd30adcc5e9a14c3366a231da728aee (patch)
treed4965ea266e0415ecea063aa7e54fd41aaa311fe
parenta82d992261f79506a0d55b9a179a211f96caf878 (diff)
mac80211: make debugfs files root-only
Unfortunately, debugfs can be made to access invalid memory by open()ing a file and then waiting until the corresponding debugfs file has been removed (and, probably, the underlying object.) That could be exploited by any user if the user is able to open debugfs files and can cause networking devices, STA entries or similar to disappear which is quite easy to do. Hence, all debugfs files should be root-only. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--net/mac80211/debugfs.c4
-rw-r--r--net/mac80211/debugfs_netdev.c6
-rw-r--r--net/mac80211/debugfs_sta.c2
3 files changed, 6 insertions, 6 deletions
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 4736c64937b..f4bb08b62d1 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -37,7 +37,7 @@ static const struct file_operations name## _ops = { \
};
#define DEBUGFS_ADD(name) \
- local->debugfs.name = debugfs_create_file(#name, 0444, phyd, \
+ local->debugfs.name = debugfs_create_file(#name, 0400, phyd, \
local, &name## _ops);
#define DEBUGFS_DEL(name) \
@@ -130,7 +130,7 @@ static const struct file_operations stats_ ##name## _ops = { \
};
#define DEBUGFS_STATS_ADD(name) \
- local->debugfs.stats.name = debugfs_create_file(#name, 0444, statsd,\
+ local->debugfs.stats.name = debugfs_create_file(#name, 0400, statsd,\
local, &stats_ ##name## _ops);
#define DEBUGFS_STATS_DEL(name) \
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 3e19d42e61c..55cd6fc3f2e 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -243,7 +243,7 @@ IEEE80211_IF_WFILE(min_discovery_timeout,
#define DEBUGFS_ADD(name, type)\
- sdata->debugfs.type.name = debugfs_create_file(#name, 0444,\
+ sdata->debugfs.type.name = debugfs_create_file(#name, 0400,\
sdata->debugfsdir, sdata, &name##_ops);
static void add_sta_files(struct ieee80211_sub_if_data *sdata)
@@ -298,7 +298,7 @@ static void add_monitor_files(struct ieee80211_sub_if_data *sdata)
#ifdef CONFIG_MAC80211_MESH
#define MESHSTATS_ADD(name)\
- sdata->mesh_stats.name = debugfs_create_file(#name, 0444,\
+ sdata->mesh_stats.name = debugfs_create_file(#name, 0400,\
sdata->mesh_stats_dir, sdata, &name##_ops);
static void add_mesh_stats(struct ieee80211_sub_if_data *sdata)
@@ -312,7 +312,7 @@ static void add_mesh_stats(struct ieee80211_sub_if_data *sdata)
}
#define MESHPARAMS_ADD(name)\
- sdata->mesh_config.name = debugfs_create_file(#name, 0644,\
+ sdata->mesh_config.name = debugfs_create_file(#name, 0600,\
sdata->mesh_config_dir, sdata, &name##_ops);
static void add_mesh_config(struct ieee80211_sub_if_data *sdata)
diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index 256ea880d28..6d47a1d31b3 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -266,7 +266,7 @@ static ssize_t sta_agg_status_write(struct file *file,
STA_OPS_WR(agg_status);
#define DEBUGFS_ADD(name) \
- sta->debugfs.name = debugfs_create_file(#name, 0444, \
+ sta->debugfs.name = debugfs_create_file(#name, 0400, \
sta->debugfs.dir, sta, &sta_ ##name## _ops);
#define DEBUGFS_DEL(name) \