From fcf89d05404dafcde581d44dfa89bd8c8def27f9 Mon Sep 17 00:00:00 2001 From: Reinette Chatre Date: Thu, 9 Jul 2009 10:33:38 -0700 Subject: [PATCH] iwlwifi: fix permissions on debugfs files debugfs files are created with 644 permissions which gives everybody read access. This presents a security issue if a user opens the file and holds it open at the time the driver removes the file. At this point invalid memory will be accessed. Fix this by only allowing root to read debugfs files. Signed-off-by: Reinette Chatre Signed-off-by: John W. Linville --- drivers/net/wireless/iwlwifi/iwl-debugfs.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c index e38ec81b839b..0b9e824b67c2 100644 --- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c +++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c @@ -49,7 +49,8 @@ #define DEBUGFS_ADD_FILE(name, parent) do { \ dbgfs->dbgfs_##parent##_files.file_##name = \ - debugfs_create_file(#name, 0644, dbgfs->dir_##parent, priv, \ + debugfs_create_file(#name, S_IWUSR | S_IRUSR, \ + dbgfs->dir_##parent, priv, \ &iwl_dbgfs_##name##_ops); \ if (!(dbgfs->dbgfs_##parent##_files.file_##name)) \ goto err; \ @@ -57,7 +58,8 @@ #define DEBUGFS_ADD_BOOL(name, parent, ptr) do { \ dbgfs->dbgfs_##parent##_files.file_##name = \ - debugfs_create_bool(#name, 0644, dbgfs->dir_##parent, ptr); \ + debugfs_create_bool(#name, S_IWUSR | S_IRUSR, \ + dbgfs->dir_##parent, ptr); \ if (IS_ERR(dbgfs->dbgfs_##parent##_files.file_##name) \ || !dbgfs->dbgfs_##parent##_files.file_##name) \ goto err; \ @@ -65,7 +67,7 @@ #define DEBUGFS_ADD_X32(name, parent, ptr) do { \ dbgfs->dbgfs_##parent##_files.file_##name = \ - debugfs_create_x32(#name, 0444, dbgfs->dir_##parent, ptr); \ + debugfs_create_x32(#name, S_IRUSR, dbgfs->dir_##parent, ptr); \ if (IS_ERR(dbgfs->dbgfs_##parent##_files.file_##name) \ || !dbgfs->dbgfs_##parent##_files.file_##name) \ goto err; \ -- 2.20.1