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authorStephen Boyd <sboyd@codeaurora.org>2015-10-12 18:09:12 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-10-17 22:09:03 -0700
commit6713e8fb541656d00249dca6627395b461c39ece (patch)
treedeb11dca54f169a638e03dfa9c95b5de9bf32a6d /fs/debugfs
parent6db6652abc3d81e155b6c8740065e9a4927825d9 (diff)
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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>
Diffstat (limited to 'fs/debugfs')
-rw-r--r--fs/debugfs/file.c15
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);