diff options
author | Stephen Boyd <sboyd@codeaurora.org> | 2015-10-13 04:09:12 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-18 08:09:03 +0300 |
commit | 6713e8fb541656d00249dca6627395b461c39ece (patch) | |
tree | deb11dca54f169a638e03dfa9c95b5de9bf32a6d | |
parent | 6db6652abc3d81e155b6c8740065e9a4927825d9 (diff) | |
download | linux-6713e8fb541656d00249dca6627395b461c39ece.tar.xz |
debugfs: Add read-only/write-only bool file ops
There aren't any read-only or write-only bool file ops, but there
is a caller of debugfs_create_bool() that calls it with mode
equal to 0400. This leads to the possibility of userspace
modifying the file, so let's use the newly created
debugfs_create_mode() helper here to fix this.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | fs/debugfs/file.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c index e8e73aebe6b8..8450549d54a9 100644 --- a/fs/debugfs/file.c +++ b/fs/debugfs/file.c @@ -450,6 +450,18 @@ static const struct file_operations fops_bool = { .llseek = default_llseek, }; +static const struct file_operations fops_bool_ro = { + .read = debugfs_read_file_bool, + .open = simple_open, + .llseek = default_llseek, +}; + +static const struct file_operations fops_bool_wo = { + .write = debugfs_write_file_bool, + .open = simple_open, + .llseek = default_llseek, +}; + /** * debugfs_create_bool - create a debugfs file that is used to read and write a boolean value * @name: a pointer to a string containing the name of the file to create. @@ -477,7 +489,8 @@ static const struct file_operations fops_bool = { struct dentry *debugfs_create_bool(const char *name, umode_t mode, struct dentry *parent, bool *value) { - return debugfs_create_file(name, mode, parent, value, &fops_bool); + return debugfs_create_mode(name, mode, parent, value, &fops_bool, + &fops_bool_ro, &fops_bool_wo); } EXPORT_SYMBOL_GPL(debugfs_create_bool); |