From: David P. Quigley <[email protected]>
Revalidate the write permissions for fallocate(2), in case security policy has
changed since the files were opened.
Acked-by: James Morris <[email protected]>
Signed-off-by: David P. Quigley <[email protected]>
---
fs/open.c | 3 +++
1 files changed, 3 insertions(+)
Index: linux-2.6.22/fs/open.c
===================================================================
--- linux-2.6.22.orig/fs/open.c
+++ linux-2.6.22/fs/open.c
@@ -407,6 +407,9 @@ asmlinkage long sys_fallocate(int fd, in
goto out;
if (!(file->f_mode & FMODE_WRITE))
goto out_fput;
+ ret = security_file_permission(file, MAY_WRITE);
+ if (ret)
+ goto out_fput;
inode = file->f_path.dentry->d_inode;
-
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