There aren't any read-only or write-only size_t file ops, but there
is a caller of debugfs_create_size_t() 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 <sb...@codeaurora.org>
---
fs/debugfs/file.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index f69d42efe4b8..e8e73aebe6b8 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -352,6 +352,8 @@ static int debugfs_size_t_get(void *data, u64 *val)
}
DEFINE_SIMPLE_ATTRIBUTE(fops_size_t, debugfs_size_t_get, debugfs_size_t_set,
"%llu\n"); /* %llu and %zu are more or less the
same */
+DEFINE_SIMPLE_ATTRIBUTE(fops_size_t_ro, debugfs_size_t_get, NULL, "%llu\n");
+DEFINE_SIMPLE_ATTRIBUTE(fops_size_t_wo, NULL, debugfs_size_t_set, "%llu\n");
/**
* debugfs_create_size_t - create a debugfs file that is used to read and
write an size_t value
@@ -366,7 +368,8 @@ DEFINE_SIMPLE_ATTRIBUTE(fops_size_t, debugfs_size_t_get,
debugfs_size_t_set,
struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
struct dentry *parent, size_t *value)
{
- return debugfs_create_file(name, mode, parent, value, &fops_size_t);
+ return debugfs_create_mode(name, mode, parent, value, &fops_size_t,
+ &fops_size_t_ro, &fops_size_t_wo);
}
EXPORT_SYMBOL_GPL(debugfs_create_size_t);
--
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