Currently, fsnotify_open_perm() is called from security_file_open(). This
is not right for CONFIG_SECURITY=n and CONFIG_FSNOTIFY=y case, as
security_file_open() in this combination will be a no-op and not call
fsnotify_open_perm(). Fix this by calling fsnotify_open_perm() directly.
Signed-off-by: Song Liu <song@xxxxxxxxxx>
---
PS: I didn't included a Fixes tag. This issue was probably introduced 15
years ago in [1]. If we want to back port this to stable, we will need
another version for older kernel because of [2].
[1] c4ec54b40d33 ("fsnotify: new fsnotify hooks and events types for access decisions")
[2] 36e28c42187c ("fsnotify: split fsnotify_perm() into two hooks")
---
fs/open.c | 4 ++++
security/security.c | 9 +--------
2 files changed, 5 insertions(+), 8 deletions(-)
diff --git a/fs/open.c b/fs/open.c
index acaeb3e25c88..6c4950f19cfb 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -946,6 +946,10 @@ static int do_dentry_open(struct file *f,
if (error)
goto cleanup_all;
+ error = fsnotify_open_perm(f);
+ if (error)
+ goto cleanup_all;
+
error = break_lease(file_inode(f), f->f_flags);
if (error)
goto cleanup_all;
diff --git a/security/security.c b/security/security.c
index 6875eb4a59fc..a72cc62c0a07 100644
--- a/security/security.c
+++ b/security/security.c
@@ -19,7 +19,6 @@
#include <linux/kernel.h>
#include <linux/kernel_read_file.h>
#include <linux/lsm_hooks.h>
-#include <linux/fsnotify.h>
#include <linux/mman.h>
#include <linux/mount.h>
#include <linux/personality.h>
@@ -3102,13 +3101,7 @@ int security_file_receive(struct file *file)
*/
int security_file_open(struct file *file)
{
- int ret;
-
- ret = call_int_hook(file_open, file);
- if (ret)
- return ret;
-
- return fsnotify_open_perm(file);
+ return call_int_hook(file_open, file);
}
/**
--
2.43.5
